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    Rescue Launch
    by Graham93 πŸ‡¬πŸ‡§ ( Commodore)
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    3 Posts 16 Comments 0 Photos 23 Likes
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    πŸ“ Motor and Propshaft
    12 days ago by Graham93 ( Commodore)
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    Before Finley returns to continue with the construction. I need to install and align the motor and propshaft.

    The instruction booklet suggests fitting a 1500kV brushless motor which surprised me as I was expecting it to call for a brushed motor, but I thought 'why not?' so a suitable motor and ESC were ordered.

    First job once the motor arrived was to make a mounting bracket. I found an old domestic radiator mounting bracket in the scrap box. A short length cut from this gave a strong, lightweight right angled bracket. Four holes were drilled and tapped for the motor mount, and another four holes drilled and countersunk for screwing the bracket into the hull.

    The motor has a 4mm dia. shaft and I'd already found a 30mm propeller, left over from Crash Tender commissioning, which had an M4 thread. Based on these part dimensions, I decided to use a 4mm propshaft and a 7mm dia. outer tube. With the tube in situ, but not glued, a hardwood wedge was made to match the angle of the tube. To align the motor shaft with the tube, an alignment tool was made. This is simply a length of steel which was turned to be a sliding fit in the propshaft tube, and with a 4mm hole to slip over the motor shaft. With this tool, it was a simple matter to adjust the heights of the wooden wedge to align the motor shaft with the propshaft tube. The wedge was then glued into position.

    While the glue was drying, two phosphor bronze bushes were turned for the propshaft. With these fitted, and the alignment tool used to ensure everything was in line, the propshaft tube was epoxied into position.

    Finally, the alignment tool was replaced with a universal coupling, and the other end of the shaft was threaded M4 so that the propeller could be attached. A quick check was carried out with the ESC attached and powered up. All seems to be OK so far. 🀞
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    πŸ’¬ Re: Motor and Propshaft
    9 days ago by Graham93 ( Commodore)
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    Rick,

    Yes he will. Trouble is that he is now back at school so not sure when he will have time. His diary is busier than mine πŸ™„
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    πŸ’¬ Re: Motor and Propshaft
    10 days ago by Newby7 ( Vice Admiral)
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    Nice job Graham.With power in Finley will be able to proceed to all the good parts of the build.
    Rick
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    πŸ’¬ Re: Motor and Propshaft
    10 days ago by Graham93 ( Commodore)
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    Exactly right Michael. Wood moves with changes in temperature/humidity. I thinks some sort of flexible joint is essential.

    Graham93
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    πŸ’¬ Re: Motor and Propshaft
    10 days ago by mturpin013 ( Rear Admiral)
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    Removed as its Duplicated below
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    πŸ’¬ Re: Motor and Propshaft
    10 days ago by mturpin013 ( Rear Admiral)
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    Hi Graham that looks a nice assembly, in particular the modified Phosphor bronze bushes, I see a joint in the drive chain, a lot of modelers go for a solid connector taking great care to align the motor and prop shaft, I personally think this isn't the best option, the reason being having done this myself and gone to the trouble of using a dial indicator to align the shafts in the workshop (workshop heated) I later went to the test tank (in the garage cold) and found the alignment was no longer ! this was due to temperature change when wood has a habit of moving around at different temperatures.
    I'm sure that some sort of universal joint is the way to go, It may be with some types they are a little noisier but still probably not as noisy as a brushless motor anyway. I still go to the trouble of aligning the shaft and motor with a solid joint first and then replace it with an appropriate flexible joint.
    As demonstrated in Grahams description😊
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    πŸ’¬ Re: Motor and Propshaft
    11 days ago by stevedownunder ( Lieutenant)
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    Hi Graham,

    I bet Finley will be eager to get cracking on this boat, can't start them too young.

    Cheers,
    Stephen.
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    πŸ“ Starting the assembly
    17 days ago by Graham93 ( Commodore)
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    The first thing to do is "Read the Instructions" and study the parts to work out what goes whereπŸ˜‰.

    The micro chisel works well to release the laser cut parts from the plywood sheets. Less risk of cut fingers and somehow we managed to avoid any bruises.

    The parts are accurate and easy to fit together with very little cleaning up required. The first challenge came when fitting the centre keel to the underside of the hull bottom. The keel is in two pieces which are spaced to leave a gap for the propshaft. There is no hole in the hull bottom for the propshaft to pass through so the keel pieces were used to work out where to cut the hole. A length of 7mm dia. brass tube was used to ensure that the hole was big enough and in the right place. The keel doublers were added to strengthen the area around the shaft tube. Additional keel doublers were needed to accommodate the 7mm tube. These were cut from scrap ply.

    Having completed the basic hull framework, the next instruction in the manual is to fit the side skins. However doing that at this stage would make fitting and aligning the motor much more difficult. Better to sort out the motor mounting while there is access through the sides of the hull. It is a shame that there isn't a note in the instructions explaining this as an inexperienced builder would likely press on at this stage and then have the challenge of having to fit and align the motor through the restricted deck access hatch.

    As I needed some time, (and peace and quiet 😁) to sort out the motor mount, 'we' decided to move on to assembling the cabin. Finley cut out the parts using the chisel, I held them in place while he applied the superglue. I didn't end up with too much on my fingers and managed to peel them off the model several times. 😊

    The cabin is built in situ but needs to be removable to gain access to the inside of the hull. Masking tape was applied around the access hatch before the cabin pieces were glued in place to ensure that it didn't end up permanently attached, despite the liberal application of superglue!

    By the end of the day we had made good progress. Finley went home and wouldn't stop telling his Mum and Dad about the boat. He wanted to come back the next day to carry on construction, but I need time to sort out the motor mount, and the rudder servo mount, before he returns.

    Sorry there aren't so many photos, but I had my hands full!
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    πŸ’¬ Re: Starting the assembly
    15 days ago by mturpin013 ( Rear Admiral)
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    That's great to see a young modeller getting to grips with a model
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    πŸ’¬ Re: Starting the assembly
    17 days ago by GaryLC ( Midshipman)
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    Well done Graham and young Findley, I found your blog both interesting and enterprising and pleasantly different from the majority of the stuff on here. Very best wishes to both of you especially your young apprentice. Regards, Gary. (Looking forward to the next installment.)
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    πŸ’¬ Re: Starting the assembly
    17 days ago by Graham93 ( Commodore)
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    Hi Rick,

    Yes, he did enjoy it. So did I, but it was exhausting having to keep watch over him every second and having to answer the endless questions "What's that for Grandad?" 😍

    Graham93
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    πŸ’¬ Re: Starting the assembly
    17 days ago by Newby7 ( Vice Admiral)
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    Well done Graham.πŸ‘πŸ‘πŸ‘Sounds and looks like Finley enjoyed the day .
    Rick
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    πŸ“ Rescue Launch
    22 days ago by Graham93 ( Commodore)
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    A few weeks ago, while looking after our 7 year old grandson for the day while his mum and dad were at work he asked (several times) if he could help me building my boats. As I'm not currently building anything, we had to find other things to do build (Lego) for the day. After he had gone home, I started to think about a boat he could help build.

    I had come across HAkits in a couple of blogs on this site so found their website and decided that their Rescue Launch would make a nice model for a 7 year old. The kit was duly ordered and arrived a few days later.

    Building from a kit like this is a bit of a departure for me as I usually scratch build my models. The kit was well packaged but there didn't seem to be much in the bag. Three sheets of laser cut ply, a few sticks (rubbing strakes), some plastic window frames, a sheet of clear acetate with a template for the windows and an instruction manual.

    The instruction manual will look familiar to any 7 year old who is used to building Lego kits. It has numbered steps, each with a drawing of the assembly showing the next piece to be fitted. Each of the laser cut parts is identified with it's name etched into the surface. However I did notice that in some cases the name of the part used in the instructions is different to the name etched into it. For example assembly step 3 says 'glue the bow former .. in place'. The required piece is etched with 'bulkhead 1 support'. Guaranteed to confuse a 7 year old (and his grandad occasionally πŸ˜‰).

    The pieces need to be cut from the ply sheets with a Stanley knife. I didn't like the idea of sending my grandson home with bandaged fingers at the end of the day so decided to make a thin 'chisel' from a snap-off blade mounted in a dowel handle. This should allow the pieces to be freed from the ply sheet using a hammer with less risk to little fingers.

    So now I'm ready, waiting for the return of Finley....
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    πŸ’¬ Re: Rescue Launch
    19 days ago by Nerys ( Admiral)
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    Hi Rick,
    Excellent idea to get the kids interested. One of our local clubs, at open days etc. takes a number of simple boats for kids to try out. It's always very popular both with the kids and their parents. I think they charge a small fee, 50p a go comes to mind.

    Nerys
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    πŸ’¬ Re: Rescue Launch
    19 days ago by Nerys ( Admiral)
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    That paddle boat looks fun, I've looked at it on Ebay and there are umpteen sellers, mainly in China. The price seems to vary between about Β£5 and Β£11 with the dearer ones in UK. There was also one listed from Sri Lanka with a price of Β£50 something and Β£22 postage. I've a vague recollection of having something similar working off elastic bands in my dim and distant past. I think I might even buy one. Keep me amused for an hour or two.

    Nerys
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    πŸ’¬ Re: Rescue Launch
    20 days ago by Newby7 ( Vice Admiral)
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    When my boat club was able to have an open house and set up our pool. We have pusher tugs we let children run. The joy of watching them run the boats trying to dock them or racing one another they giggle and laugh the hole time.I'm sure we all smile at there fun.
    Along with the pusher tugs we have made small sailing kits for them to build. We make 3 or 4 hundred kits for the show. We sell out all kits at 2$ a kit and donate the funds to help kids organizations.
    For me the joy of watching them build and run the boat is a lifting feeling .
    Rick
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    πŸ’¬ Re: Rescue Launch
    21 days ago by Graham93 ( Commodore)
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    Michael,

    That’s an unbelievable low price. I’ll be interested to hear how well it works.

    It’s surprising how the costs add up when you add motor, esc, etc to the price of the kit. I’ve probably spent 10x the cost of your kit.

    Graham93
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    πŸ’¬ Re: Rescue Launch
    21 days ago by Nerys ( Admiral)
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    It's an excellent idea to get children using tools at an early age and the simple kit is a good way to start doing it. When I was young, my father, whenever he was home from sea spent a lot of time with me doing just that. I think the first thing he taught me to do was to carve little figures from the wood from butter boxes. (Butter came in bulk in boxes in those days and was cut up into whatever weight the customer required) The wood was always a good knot free close grained wood. I think the first major thing I carved was a little man on a horse. He often brought model boats home for me, hours of off watch work, so it wasn't long before I was working on waterline models. This stood me in good stead because by the time I was twelve, I was making toy model boats and selling them to local shops, this was of course during the war and toys were in short supply. I was also the lead soldier baron of the school, I had a set of moulds to make lead soldiers and sold the result in school for 1 1/2 old pence each.
    As far as my own son was concerned, he was brought up helping me build real boats, he learnt to use tools at an early age including such things as draw knives and an adze. At fourteen, he made all the spars for my 43ft. schooner . This he always said got him his first job as an apprentice joiner by telling his interviewer about the tools and what he had done with them. He went on to have a successful business converting horse boxes into vehicles for motor racing and horse eventing.
    So, all praise to anyone who teaches children to use tools. Catch 'em young is the answer.

    Cheers, Nerys
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    πŸ’¬ Re: Rescue Launch
    21 days ago by mturpin013 ( Rear Admiral)
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    Hi Graham I found myself in a similar position and on a day when my eldest son (45) was helping me with some electronics, my 8yr old grandson was occupying himself cutting up small cardboard boxes trying to make a paddle boat. It did float and he enjoyed making it but I felt as if I'd let him down not being involved.
    So what did I do, I made a similar purchase, I could hardly believe what value for money Β£6:89 inc P&P for this radio controlled model, I have since seen them for as little as Β£5:15 free P&P

    DIY Paddle Wheel Ship Model Kids Students Remote Control Assembling Toys UKhttps://www.ebay.co.uk/itm/184521112237

    The kit looks very comprehensive with motors electronics, laser cut ply and gears. I let you know how it went after the build.
    https://www.ebay.co.uk/itm/184521112237
    πŸ”—
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