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    17

















    Followers
    Kayak
    by Graham93 ๐Ÿ‡ฌ๐Ÿ‡ง ( Rear Admiral)
    ๐Ÿ“ฃ










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    6 Posts 54 Comments 0 Photos 62 Likes
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    ๐Ÿ“ Lofting
    2 days ago by Graham93 ( Rear Admiral)
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    Having gained enough confidence that the drive mechanism has a fair chance of working, it's time to start the build. The blog posts so far have been catching up with a build that started almost a year ago. The remainder of this blog will be close to real-time.

    The book by Nick Schade contains 'tables of offsets' for three different kayaks. The book also describes in detail how to use these tables to draw plans. This is new to me and I struggled with understanding the tables and the terminology, but worked it out eventually with the guidance from the book.

    The nice thing about having a plan made up of lots of numbers in a table (of offsets) is that it is relatively easy to scale the dimensions to any desired size. This can be done manually but as there are several hundred figures to be scaled, I opted to use a spreadsheet.

    All the numbers were typed into a spreadsheet and then scaled and converted from imperial to metric using a simple formula. The graph function of the spreadsheet was then used to draw a half profile of each form. These graphs were copied and pasted into Photoshop. In Photoshop, each half profile was mirrored to produce a full profile for each of the 16 forms.

    With the plans drawn, at last it is time to start making sawdust ๐Ÿ‘
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    ๐Ÿ’ฌ Re: Lofting
    2 days ago by stevedownunder ( Commander)
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    Great work Graham,
    I like the idea of using a spread sheet, I will try to remember that one.

    Cheers,
    Stephen.
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    ๐Ÿ’ฌ Re: Lofting
    2 days ago by pressonreguardless ( Lieutenant Commander)
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    WELL, DONE, Graham๐Ÿ‘๐Ÿ‘๐Ÿ‘๐Ÿ‘
    I love your thought process
    Trev
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    ๐Ÿ“ Controls
    3 days ago by Graham93 ( Rear Admiral)
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    I've ended up with four controls for the kayak:
    1. Paddling - speed and fwd/reverse
    2. Steering - tilting the paddle to port or starboard
    3. Rudder - traditional rudder on the stern of the kayak
    4. Paddler head turning - so he can see where he is going!

    These could simply be allocated to separate channels on the transmitter with the paddling speed and head turning on the left stick, and the steering/rudder on the right stick. However, I like to add custom electronics to my builds where this helps with the realism of the model and/or it makes it easier to control.

    The first photo shows a block diagram of the controller. A single connection from the receiver carries all the channels received from the transmitter. The controller then processes these and feeds out separate signals to the ESC and the three servos. With suitable software programmed into to PIC microchip the controller will provide the following functions:

    1. Pulse stretching for the head turning servo to give more rotation than the standard 90 degree servo output.
    2. Driving both the steering and rudder servos from a single Tx channel as this is more logical. The range of movement of each servo can be independently set as they need to be different.
    3. When stopping, automatically position the paddle horizontal with the blades out of the water. Tricky to achieve this manually from the Tx.
    4. When turning, the paddle is tilted to one side, such that one blade is in use, and the other is held clear of the water. When the turn request from the Tx reaches maximum turn, the paddle stops moving and switches sides to place the opposite blade in the water thus acting as a pivot point for turning.
    5. Using the rudder to compensate for the turning effect of the paddle stroke. On each stroke of the paddle, the kayak will tend to turn away from the stroke. On full sized kayaks, it is normal to use the rudder to correct for this turning movement on each stroke.

    A lash up of the controller was put together to test the circuit and for initial software development. Once this was working, it was rebuilt in its final form and fitted into an ABS enclosure.

    To sense the position of the drive motor (necessary for functions 3, 4 and 5 above) a small magnet is fitted to the brass disk on the drive motor shaft and two Hall effect magnetic sensors are mounted either side of the drive motor. These provide the controller with reference points for the paddle position.

    The video shows the operation of different functions of the controller.

    https://youtu.be/OxNoQQaZ5uk

    There is more work to be done on the software, but this can be carried out while the hull is being built.
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    ๐Ÿ’ฌ Re: Controls
    2 days ago by robbob ( Admiral)
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    Hi Graham.
    A superb example of electro/mechanical design and prototyping. This project will be every bit as good a 'Bill & Ben' if not better. Great work!
    Rob.
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    ๐Ÿ’ฌ Re: Controls
    2 days ago by Graham93 ( Rear Admiral)
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    Hi Fleet,

    โ€œ Why is Kayak Ken so snooty?โ€ - I have plans to improve his appearance..... all will be revealed. That is once Iโ€™ve made the changes ๐Ÿ˜
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    ๐Ÿ’ฌ Re: Controls
    2 days ago by Graham93 ( Rear Admiral)
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    Hi Michael,

    Like the comments ๐Ÿ˜†. The fancy electronics are optional and Iโ€™m sure you would make a better job of the mechanicals than I have.

    โ€œCan I build you one?โ€ - I donโ€™t like making more than one of anything now Iโ€™m retired, besides, it would be much more interesting to build your own rather than have someone else do it for you.๐Ÿ˜‰๐Ÿ˜‚๐Ÿคฃ
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    ๐Ÿ’ฌ Re: Controls
    3 days ago by RNinMunich ( Fleet Admiral)
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    Michael,
    It's quite simple really๐Ÿ˜‰
    Pic 2 is spaghetti junction on toast,
    Pic 3 is the pizza version for mass production,
    (The special rectangular black olives can be clearly seen, not my taste๐Ÿ˜)
    Pic 4 is the Fast Food version for microwave cooking ๐Ÿ˜‹
    Pic 5 shows the debugger for the software. Anything with 3 to 6 legs that comes along will be thrown overboard, or eaten to fuel the on-board methane gas generator. Thus trickle charging the main power system.
    Pic 6 shows the hall (proximity) switch, you know, the one that switches the light on ๐Ÿ’ก when you stagger down the stairs on a winter's morn. โ„๏ธ
    Alles klar Herr Kommissar? ๐Ÿ˜‰
    ๐Ÿ˜Ž
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    ๐Ÿ’ฌ Re: Controls
    3 days ago by stevedownunder ( Commander)
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    Fantastic Graham,
    I wish I had the skill and knowledge to build somethin like that.

    Cheers,
    Stephen.
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    ๐Ÿ’ฌ Re: Controls
    3 days ago by RNinMunich ( Fleet Admiral)
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    Once again 'supercalifragilisticexpialidocious' Graham๐Ÿ˜ฎ๐Ÿ‘
    a real 'head turner'.
    Just one question!.
    Why is Kayak Ken so snooty?
    He's always looking down his nose, to see where he's going, and at we mere vassals of course!๐Ÿ˜Œ๐Ÿ˜
    (I called him Ken cos Kevin always makes me think of the precocious kid in 'Kevin Alone At Home'๐Ÿ™„)
    ๐Ÿ˜Ž
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    ๐Ÿ’ฌ Re: Controls
    3 days ago by mturpin013 ( Vice Admiral)
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    Hi Graham again pure alchemy.
    Pictures -
    1 - I understand diagram๐Ÿ‘
    2 - is a total brain block๐Ÿค”
    3 - as 2 above๐Ÿค”
    4 - yes, thats a plastic box ๐Ÿ‘
    5 - yes, plywood with electronic bits ๐Ÿ‘
    6 - switch and magnet I understand ๐Ÿ‘
    7 - Yes - that's a video that blows your mind๐Ÿคฃ
    8 - can you build me one?
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    ๐Ÿ’ฌ Re: Controls
    3 days ago by pressonreguardless ( Lieutenant Commander)
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    Pure Genius, Graham๐Ÿ‘๐Ÿ‘
    Trev
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    ๐Ÿ’ฌ Re: Controls
    3 days ago by philcaretaker ( Commander)
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    Probability, suitability, feasibility all seem ticked now Graham, ๐Ÿ˜Ž๐Ÿ‘
    We all will be watching this space !!!!?!
    Well done !!๐Ÿคž
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    ๐Ÿ“ Mechanism Mk 3
    8 days ago by Graham93 ( Rear Admiral)
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    Before going any further, I needed to check that the mechanism will fit inside the proposed kayak as there isn't a lot of room. A test rig was set up by cutting cardboard frames with holes representing the internal size of the hull. This jig only represents the middle section of the kayak. A cardboard template to represent the cockpit was added as everything will have to be installed through the cockpit hole in the hull.

    The Mk 2 mechanism just fitted in the planned position, but could not be fitted into that position through the cockpit. Based on the experience testing the Mk 2 I also had concerns that the geared motor I was using had limited torque and may prove to be inadequate to drive the craft. Hence, I decided to build the Mk 3 mechanism which is a rebuild of Mk2 with a different drive motor..

    The geared motor was replaced with a metal geared servo. The servo was dismantled and the electronics removed. Wires were added to the motor so that it could be connected to a standard ESC. A metal pin fitted to the final gear was also removed to enable continuous rotation.

    The Mk2 mechanism was rebuilt onto both sides of a plywood panel. Most of the mechanism was reused, although some parts were remade (several times!). The steering servo was also mounted onto the panel (a couple of times).

    This new mechanism fits into the test rig through the cockpit.

    Wanting to keep the total weight down the rower underwent some drastic surgery. Action man figures are made from thick plastic so that they are very durable, but it also makes them relatively heavy. I found that the joints on the original arms were quite stiff, even after surgery, so the arms have been replaced with a couple of linked springs. A mini servo mounted in the 'abdomen' is linked to the head with a flexible drive shaft. This will enable the paddler to look where he is going! Once he has his waterproof on, he looks OK to me. The arms of his waterproof will be lightly stuffed with soft toy polyester stuffing to bulk them out a little.

    A short video showing it in operation driven from an ESC which gives forward and backward paddling:
    https://youtu.be/t5feNNAvdbQ

    (There are detail differences between some of the photos as they were taken at different stages in the iterative design of the Mk3 mechanism.)
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    4 days ago by Graham93 ( Rear Admiral)
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    Hi JB,

    Canโ€™t have the paddler eating too much honey, Iโ€™ve got to keep the total weight down. Heโ€™s already undergone some drastic weight reduction surgery ๐Ÿ˜‚

    Graham93
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    5 days ago by jbkiwi ( Fleet Admiral)
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    Amazing and ingenious bit of mechanization, (I think it's all the honey he's been eating)๐Ÿ˜‚

    JB
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    5 days ago by mturpin013 ( Vice Admiral)
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    Speechless.๐Ÿค”
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    6 days ago by Graham93 ( Rear Admiral)
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    Thanks everyone for the comments and encouragement. Iโ€™m just back from a weekend away attending my granddaughterโ€™s third birthday ๐ŸŽ‚.

    Itโ€™s taken several weeks of making and remaking parts of the mechanism to get to this stage. Iโ€™ve just realised that the video clip is of an interim version without all the changes. Iโ€™ll make another video and post it later this week.

    Graham93
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    7 days ago by Julio ( Petty Officer 2nd Class)
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    Hi, Graham:
    Is amazing!!
    It is amazing to see the operation of this mechanism!!
    Thanks for sharing it with us
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    7 days ago by pressonreguardless ( Lieutenant Commander)
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    Truly Amazing, Graham!!!
    Thanks for Sharing๐Ÿ‘
    Trev
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    7 days ago by river rat ( Chief Petty Officer 2nd Class)
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    Wow! Just Wow! You are an Amazing man! Keep up the great work. Can't wait to see it underway. Thanks Dave
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    7 days ago by mturpin013 ( Vice Admiral)
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    Fantastic Graham, Iโ€™m on holiday at the moment so canโ€™t download the video but Iโ€™ll comment further on my return
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    7 days ago by GaryLC ( Lieutenant)
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    Absolutely love this project along with the thought and sheer determination that went into it. I think your achievement is incredible bordering on genius. Your oarsman (Kev the kayak) has a very determined look about him and determination is what it is all about. Keep up the good work as a very interesting project if ever there was. Regards, Gary.
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    8 days ago by stevedownunder ( Commander)
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    Fantastic work Graham,

    Cheers,
    Stephen.
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    8 days ago by MouldBuilder ( Rear Admiral)
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    Superb Graham, as usual.
    How aboutโ€™ The bees kneesโ€™ for the name.๐Ÿ˜ฌ
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    8 days ago by Colin H ( Admiral)
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    It's amazing, I could do with your mechanical genius in full size to keep me moving.
    Well done shipmate, cheers Colin.
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    ๐Ÿ’ฌ Re: Mechanism Mk 3
    8 days ago by philcaretaker ( Commander)
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    Love it ,
    Love it ,
    Love it ! ๐ŸคŸ๐Ÿ˜Ž

    Brilliant Graham !!
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    ๐Ÿ“ Mechanism Mk 2
    12 days ago by Graham93 ( Rear Admiral)
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    The project stalled for several months while I got on with the rest of my life! However I did find a short video clip on YouTube which looked promising so I had a go at building a replica.

    A small geared motor at the left rotates a brass disk to which are attached two pushrods. The brass plate in the middle pivots on a screw. The other end of the plate will connect to a servo to move the plate from side to side. This movement of the plate will provide steering as it will tilt the vertical shaft on which the paddle is mounted.

    A short video clip to show it in operation:
    https://youtu.be/lNeZK1UDmWQ

    In the video, there is an additional vertical pushrod which feathers the paddle blades as the enter and leave the water.

    I think this shows promise, so I will rebuild it in a form that will fit in the planned kayak.
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    ๐Ÿ’ฌ Re: Mechanism Mk 2
    9 days ago by RNinMunich ( Fleet Admiral)
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    Ref Name,
    No contest! Continuing the 'Flower Pot Men' theme it has to be "(Little) Weed" ๐Ÿ˜
    'Loblob' job on the mechanism btw Graham๐Ÿ‘
    I was wondering; have you made Bill and Ben their 'Flobberpops' yet? ๐Ÿ˜‚
    No? 'FLOBABDOB'๐Ÿ˜ 
    "Babap ickle Weed"
    ๐Ÿ˜Ž
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    ๐Ÿ’ฌ Re: Mechanism Mk 2
    10 days ago by Graham93 ( Rear Admiral)
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    Thanks Gary,

    Kev is a possibility, together with Charlie as suggested by Rob.

    Plenty of time yet to decide on a name as the build has hardly started.

    Graham93
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    ๐Ÿ’ฌ Re: Mechanism Mk 2
    11 days ago by GaryLC ( Lieutenant)
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    Yes, Kayak Kevin sounds about right, and Kev for the shortened version. I think your mark 2 version is bordering on genius, all those different movements from one servo motor, I wouldn't have believed that was possible. Please keep up the good work on this very interesting project of yours. Regards, Gary.
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    ๐Ÿ’ฌ Re: Mechanism Mk 2
    11 days ago by robbob ( Admiral)
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    Charlie ?
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    ๐Ÿ’ฌ Re: Mechanism Mk 2
    11 days ago by Graham93 ( Rear Admiral)
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    Hi Phil,

    I havenโ€™t come up with a name for the rower yet. Any suggestions anyone?

    Graham93
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    ๐Ÿ’ฌ Re: Mechanism Mk 2
    11 days ago by Graham93 ( Rear Admiral)
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    Hi Stephen,

    Yes, I think it does look promising. A much simpler approach than the stepper motor mechanism, but it will depend on getting all the linkages to right length.

    Graham93
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    ๐Ÿ’ฌ Re: Mechanism Mk 2
    12 days ago by pressonreguardless ( Lieutenant Commander)
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    Excellent Engineering.
    Trev
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    ๐Ÿ’ฌ Re: Mechanism Mk 2
    12 days ago by philcaretaker ( Commander)
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    Awesome Graham !
    What will you call kayak man ????
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    ๐Ÿ’ฌ Re: Mechanism Mk 2
    12 days ago by stevedownunder ( Commander)
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    Great work Graham,
    Looks very promising in my opinion.

    Cheers,
    Stephen.
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    ๐Ÿ“ Mechanism
    16 days ago by Graham93 ( Rear Admiral)
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    The aim is to achieve movement of the paddler that is as realistic as possible. Steering should also be by means of the paddle, rather than solely relying on a separate rudder.

    The rowing boat uses simple mechanics with software programmed into a microchip to achieve the required motion. That way the mechanics are easier to build, and adjustments to the movements can mostly be made by editing the software. The same approach is planned for the kayak.

    Two small stepper motors were purchased and a test rig assembled. The two motors can be seen, back to back in the first photo. They each have a brass disk mounted on the output shaft. Pushrods link the disks to the paddle via fixed pivots. The second photo shows the overall arrangement and the third gives an idea of how it will fit into the kayak with a cardboard template showing the internal cross section.

    The software controls and syncronises the two stepper motors allowing the paddler to paddle forwards, backwards or to use just one blade in the water to steer the craft. A short video showing paddling forwards and backwards:

    https://youtu.be/-6oGSucIyc0

    Paddling is deliberately slow in the video so that I can work out what is happening and adapt the software as necessary.

    A second video showing turning to starboard by just using the port blade of the paddle:

    https://youtu.be/rG8uy71KOKI

    A bit more confusing that one๐Ÿค”. The final photograph shows an additional pushrod between one of the rotating disks and the shaft of the paddle. This feathers the blades as the paddle tips from side to side. Also in this photo a pushrod can just be seen below the paddler's torso. This connects to a separate servo which operates in sync with the paddle movement and twists the paddler from side to side as he paddles.

    After several months messing with this mechanism I scrapped it! The movement isn't what I was hoping to achieve, and I'm not convinced that the stepper motors will have enough torque to propel the model.

    Back to the drawing board!.....
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    ๐Ÿ’ฌ Re: Mechanism
    9 days ago by Cashrc ( Captain)
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    Soโ€ฆ.veryโ€ฆ.COOL!!! Nice job of engineering!!
    Cash
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    ๐Ÿ’ฌ Re: Mechanism
    15 days ago by Graham93 ( Rear Admiral)
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    Thanks Gary,

    The head was being adapted When I filmed that. It will be attached to a servo in the body. That way, not only will he be able to see where he is going, he will also be able to look where he is going. ๐Ÿ˜‰

    Graham93
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    ๐Ÿ’ฌ Re: Mechanism
    15 days ago by GaryLC ( Lieutenant)
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    I really very much admire your patience and ability to fathom out the exact movement you are looking for, and not for the faint-hearted like myself. It seems to be going well in these early trials and looks very promising. As my electronic skill is zilch I am not in a position to offer advice or anything else, mind I am very interested in your project so please keep us all informed of your progress on this venture. (Please refit his head so he can see where he is going?) Regards,Gary.
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    ๐Ÿ’ฌ Re: Mechanism
    15 days ago by Graham93 ( Rear Admiral)
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    Thanks everyone for the kind comments.

    It was interesting to put together, but somehow it just didnโ€™t feel right so I decided to explore an alternative approach..

    Graham93
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    ๐Ÿ’ฌ Re: Mechanism
    16 days ago by Brightwork ( Lieutenant)
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    Just genius!!
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    ๐Ÿ’ฌ Re: Mechanism
    16 days ago by stevedownunder ( Commander)
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    Fantastic work Graham, even if it didn't work to your expectations.

    It is quite a challenge I am guessing, to mimic a person paddling.

    Looking forward to seeing version no2.

    Cheers,
    Stephen.
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    ๐Ÿ’ฌ Re: Mechanism
    16 days ago by mturpin013 ( Vice Admiral)
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    You never cease to amaze Graham, Oh to have your electronic knowledge along with your mechanical ability its truly a fantastic combination, I look forward to version 2
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    ๐Ÿ’ฌ Re: Mechanism
    16 days ago by robbob ( Admiral)
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    What you have done in your first attempt is possibly way beyond what most, if not all, of us could have hoped to achieve. That you are re-visiting the project would imply that you may have surmounted the initial problems.๐Ÿ˜€
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    ๐Ÿ’ฌ Re: Mechanism
    16 days ago by Graham93 ( Rear Admiral)
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    Hi Rob,

    Yes, I suppose it was a success in demonstrating that it didnโ€™t work!๐Ÿค”

    I should explain that Iโ€™m in โ€˜catch upโ€™ mode with this blog as Iโ€™ve been working on this for almost a year. I scrapped the mechanism last December and the project then stalled until recently.

    Havenโ€™t given up though๐Ÿคž

    Graham93
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    ๐Ÿ’ฌ Re: Mechanism
    16 days ago by robbob ( Admiral)
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    Hi Graham.
    "Back to the drawing board"....yes perhaps.
    Still I would regard this as a successful 'proof of concept' that just requires a re-think on more suitable hardware to achieve the desired action.
    Good work nevertheless.๐Ÿ‘๐Ÿ˜€
    Rob.
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    ๐Ÿ’ฌ Re: Mechanism
    16 days ago by AndyB ( Chief Petty Officer 1st Class)
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    Fantastic

    Just love it !
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    ๐Ÿ“ Kayak
    20 days ago by Graham93 ( Rear Admiral)
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    Time for a new scratch built boat.

    A couple of years ago I built 'Scullduggery' a scratch built rowing boat manned by Bionic Bill and Ben.

    https://model-boats.com/blogs/68795

    Scullduggery is always well received when Bill and Ben are out rowing on the lake, so I've decided to have a go at building something similar, this time a kayak.

    After a bit of research, I came across a book by Nick Schade which describes in great detail how to build a full sized wooden strip kayak. There are several instructional videos by Nick on YouTube. There is also a company in Cumbria (https://www.fyneboatkits.co.uk/ ) who offer kits to build full sized kayaks based on the designs in the book. The photo of the full sized kayak is from their website.

    The book includes tables of offsets for three different kayak designs. Using these offsets it is possible to draw up a set of plans. Entering all the figures from these offset tables into a spreadsheet makes it relatively easy to change the scale of the plans, but what scale to use?

    The scale for Scullduggery was determined by the scale of the readily available Action man figures used for the crew i.e. 1/6th scale. Why not use the same scale for the kayak?

    One concern is the load carrying capacity of the model kayak as well as it's stability on the water. The full sized kayak has a maximum loaded all up weight specification of 160kgs. This equates to only 740g for a 1/6th scale model. Not very much for the complete model including the paddler and radio gear, servos, battery, etc. Using a larger scale of 1/5th for the model improves the all up weight target to 1.28kg which may be more achievable.

    At 1/5th scale, the completed model will be 39" (986mm) long with a beam of 4.8" (120mm). Using a 1/6th scale figure as the paddler should not look out of place.

    As I did with the rowing boat, before starting construction of the hull, I want to be confident that I can build a mechanism that will drive the kayak, provide realistic looking paddle movement, fit inside the hull, and not weigh too much. So that is the next step.
    blogs/68795
    ๐Ÿ”—
    https://www.fyneboatkits.co.uk/
    ๐Ÿ”—
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    ๐Ÿ’ฌ Re: Kayak
    17 days ago by stotty1111 ( Petty Officer 1st Class)
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    Yes it is, with just forward reverse by paddle action, -- what else would you expect for something costing ยฃ15(almost 20 yrs ago)?
    Keeps kids well occupied at model shows!
    The hull is sealed, by car tape along the hull and deck line, and the paddle action is sealed by a latex piece moulded using the wooden mould. There is a little water ingress via the rudder tube, normally coated with vaseline!
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    ๐Ÿ’ฌ Re: Kayak
    17 days ago by Graham93 ( Rear Admiral)
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    Stotty,

    Thanks for posting the video clip. Interesting to see how it works. Steering looks to be controlled by a rudder. I hope to be able to steer with the paddle although I am planning to include a rudder just in case

    Graham93
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    ๐Ÿ’ฌ Re: Kayak
    18 days ago by philcaretaker ( Commander)
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    Great Video clip !!๐Ÿ‘
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    ๐Ÿ’ฌ Re: Kayak
    18 days ago by stotty1111 ( Petty Officer 1st Class)
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    video

    https://youtu.be/QS0vY1TGn80
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    ๐Ÿ’ฌ Re: Kayak
    18 days ago by philcaretaker ( Commander)
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    Bring it on Graham !!! I am looking forward to following the progress ! ๐Ÿ˜Žโ›ต
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    ๐Ÿ’ฌ Re: Kayak
    18 days ago by stotty1111 ( Petty Officer 1st Class)
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    some photos, camera battery needs charging

    video mounting, same as with photos(there is a first time for everything, least that's my excuse!! :-()
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    ๐Ÿ’ฌ Re: Kayak
    19 days ago by stotty1111 ( Petty Officer 1st Class)
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    Basically a motor /g/box with 2 x cranks at 180', 2 x crankshafts run to 2 x fixed points, the cranks are slotted so that they can slide back/forward etc. There are also 2 x brackets mounted on the top edges of the crank on these flexible u's the paddle rests in these with 2 x small slots When te motor runs the paddle supports describe an oval movement as do the paddles to simulate real paddles.
    A bit long winded, photos to come and possibly a video, I am currently repairing the paddle supports, broken in transit.
    More later!
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    ๐Ÿ’ฌ Re: Kayak
    19 days ago by Graham93 ( Rear Admiral)
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    Hi Stotty,

    I donโ€™t know what the limits are but I have loaded 10 or more at a time. I try to keep each photo to around 100kb in size. They look fine at that size, and donโ€™t take up too much space on the server.

    It would be great to see some photos of the mechanism in your kayak.

    Graham93
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    ๐Ÿ’ฌ Re: Kayak
    19 days ago by stotty1111 ( Petty Officer 1st Class)
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    So, how many photos can i mount at 1 time and what size for the images ie mbs
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    ๐Ÿ’ฌ Re: Kayak
    20 days ago by stotty1111 ( Petty Officer 1st Class)
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    I have a child's toy kayak which is r/c, it was aimed at bath time use. Cost about ยฃ15 from Amazon!
    I have had it for approaching 20 yrs, and it has been regularly used at model exhibitions where small man made ponds were available.
    It is about 18" long, I have photos somewhere of the mechanism, time allowing in the near future i will try to find them!
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