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    TID TUG
    11 Posts · 7 Followers · 15 Photos · 63 Likes
    Began 9 months ago by
    Commodore
    United Kingdom
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    Latest Post 2 months ago by
    Commodore
    United Kingdom
    Most recent posts shown first   (Show Oldest First) (Print Booklet)
    📝 Prop and prop shaft
    2 months ago by 🇬🇧 marky ( Commodore)
    ✧ 34 Views · 2 Likes · 9 Comments
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    That's me got my motor I now need the help of you kind ladies and gentlemen as to determine the length of the prop shaft I've taken a few photos for you to peruse ,on the drawing the centre line of the shaft is 6mm above the top of the keel, I'm proposing to cut a piece 1/2 the diameter of the motor out the keel to keep the shaft and motor as straight as possible strengthening either side , I'm just not sure whether to do this at frame 7 or 6 , in the photos There is a ruler on the drawing ,any idea what length the prop shaft should be?
    There is also a picture of the drawing of the prop with a ruler next to it, what diameter should the prop be? If you take the measurement from the centre line to the top it's 30mm ,is this a 60mm prop? Last question as its a single prop should it be left or right handed ?.
    Thanks in advance Marky

    💬 Re: Prop and prop shaft
    2 months ago by 🇩🇪 RNinMunich ( Fleet Admiral)
    ✧ 33 Views · 1 Like
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    MFA Como Drills
    😎


    https://www.mfacomodrills.com/
    https://www.mfacomodrills.com/gearboxes/gearboxes.html
    https://www.mfacomodrills.com/pdfs/belts%20&%20pulleys.pdf
    https://www.mfacomodrills.com/price_lists.html
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    💬 Re: Prop and prop shaft
    2 months ago by 🇬🇧 Colin H ( Fleet Admiral)
    ✧ 38 Views · 1 Like
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    Forgot to add these pictures.
    Cheers Colin.
    💬 Re: Prop and prop shaft
    2 months ago by 🇬🇧 Colin H ( Fleet Admiral)
    ✧ 37 Views · 1 Like
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    Another spanner in the works???
    If you choose to use a gearbox you won't have to cut into the keel as the output shaft would be at the bottom of the gearbox.
    Cheers Colin.
    💬 Re: Prop and prop shaft
    2 months ago by 🇬🇧 Colin H ( Fleet Admiral)
    ✧ 37 Views · 2 Likes
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    Marky, the 550 you have is a more durable motor as its a 5 pole motor whereas the 540 is a 3 pole.
    When using low throttle control the 550 will run smoother and longer with 12v.
    Cheers Colin.
    💬 Re: Prop and prop shaft
    2 months ago by 🇬🇧 marky ( Commodore)
    ✧ 29 Views · 0 Likes
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    Colin , my brothers mate has a Como MFA 540 low revving brushed motor 6-12 volts 6000 revs at 12v is this motor a better bet ?
    Cheers Marky👍
    💬 Re: Prop and prop shaft
    2 months ago by 🇬🇧 Colin H ( Fleet Admiral)
    ✧ 37 Views · 1 Like
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    Marky, this might help you decide.
    The chart shows available combinations. The top one on the list is in the tug pictures 2/3/4 running on a 12v 7ah sla battery with a 60mm 3 blade brass prop. That gives a run time of between 2 and 4 hours. Total running weight is 8.85 kilos .
    The last 2 pics are of a fishing boat running a 540 motor direct drive to 40mm 4 blade prop. Using 2x 12v 4.5ah sla's gives a run time of about 1.5 to 2 hours. Running weight is 6.7 kilos.
    Hope this helps, cheers Colin.
    💬 Re: Prop and prop shaft
    2 months ago by 🇬🇧 marky ( Commodore)
    ✧ 31 Views · 2 Likes
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    Good evening Colin and Dave, thanks for that ,having only built static before it's a bit of a learning curve for me .
    I was going to join the model boat club in Edinburgh but at the moment for medical reasons I'm very much confined to the house and shed ,if the wife had her way it would permanently be the shed 😂.
    Cheers Marky 🙄
    💬 Re: Prop and prop shaft
    2 months ago by 🇬🇧 dave976 ( Captain)
    ✧ 40 Views · 4 Likes
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    Hi Marky
    I agree with Colin. He used a 3:1 gearbox but a higher ratio would give more Tork. That motor will not give a direct drive to the 4 bladed prop so you will need to source a reduction unit. Technobots do suitable pulleys and belts. Positioning the motor should allow you to have easy access at all times to allow for servicing so is partly governed by the hatch (opening) in the deck. Most of my tugs have 12" or similar propshafts.
    Dave976


    https://www.technobotsonline.com/t2.5x6mm-timing-pulleys.html
    💬 Re: Prop and prop shaft
    2 months ago by 🇬🇧 Colin H ( Fleet Admiral)
    ✧ 39 Views · 4 Likes
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    Good evening Marky, that's a 60mm prop on the drawing but if you are going direct drive I'd reduce to 50 if gearing then its fine either way it's your model, the big prop will draw more current.
    Left or right handed on a single prop doesn't matter.
    In my opinion the motor between bulk heads 5 and 6 with a propshaft of about 12ins is right. But again that's only my opinion, it's your model and you should do it to feel right to you.
    If you decide to go through a reduction gearbox, 4 or 5 to 1 would give loads of pulling power with a lower battery drain.
    Cheers Colin.
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    📝 Motor.
    2 months ago by 🇬🇧 marky ( Commodore)
    ✧ 50 Views · 2 Likes · 2 Comments
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    Thanks Colin, I'll get the good lady to pop into the shop tomorrow and purchase the motor, that's me isolating again for 30 days after today's treatment .
    Cheers Marky👍

    💬 Re: Motor.
    2 months ago by 🇺🇸 Len1 ( Warrant Officer)
    ✧ 26 Views · 1 Like
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    thanks for the tip about Technobots and also MFACOMO looks to be a good source for drive train items
    💬 Re: Motor.
    2 months ago by 🇬🇧 Colin H ( Fleet Admiral)
    ✧ 53 Views · 2 Likes
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    Marky I forgot to mention it runs through a 3 to 1 reduction gearbox. And has a 65mm 4 blade brass prop.
    Hope you find this helpful.
    Cheers Colin.
    📝 Motor ?
    2 months ago by 🇬🇧 marky ( Commodore)
    ✧ 50 Views · 3 Likes · 1 Comment
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    I popped into a wee model shop today (before hospital) alas no one knew anything about RC for boats the dealt primarily with RC Cars but the nice young man said they had a motor -esc combo that should work ,the motor was a 550 brushed motor with a 320A water proof ESC .
    My question is would this motor combo do me for the tug?I
    And it's pretty reasonable at £18.

    💬 Re: Motor ?
    2 months ago by 🇬🇧 Colin H ( Fleet Admiral)
    ✧ 53 Views · 1 Like
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    Good evening Marky, I have a a large tug running on a 540 motor using a 12v 7ah sla battery with no issues, gives about 90 minutes running on full power while towing or up to 2.5 hours running solo.
    As the 550 is much more efficient motor it should be fine.( it's the larger tug)
    Cheers Colin.
    📝 Glued up
    2 months ago by 🇬🇧 marky ( Commodore)
    ✧ 61 Views · 3 Likes
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    Frames and keel doubled up and glued so leaving them clamped up overnight to fully cure .
    Question - if you look at the picture of the keel you will notice I've marked the position of the prop shaft on and it's quite near the top edge of the keel ,can I cut a section out the keel to accommodate the motor probably between frames 7and 6 .

    📝 Starter for 10
    2 months ago by 🇬🇧 marky ( Commodore)
    ✧ 79 Views · 10 Likes
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    Cut the pieces out ,well nicked the wee tabs and popped them out ,the frames cut in the 6mm ply were a bit scorched so Black fingerprints everywhere 😀one of the 3mm ply sheets is numbered so its just a case of pairing them up.
    Will give them a light sand some time tomorrow and then make a pattern from the cut parts and that will give me a template if I want to make another tug .

    📝 Making a start
    2 months ago by 🇬🇧 marky ( Commodore)
    ✧ 82 Views · 6 Likes
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    I've decided to make a start so tonight I'm going to start taking the keel and frames out , I got the wood pack and its good quality ply only strange thing is some frames are 6mm and other frames are 3mm and have to be doubled up ,its the same for the keel 2x forward ends and 2x aft ends obviously there's method in this madness. will post some photos later or tomorrow
    cheers Marky👍

    📝 Motor
    3 months ago by 🇬🇧 marky ( Commodore)
    ✧ 87 Views · 8 Likes · 3 Comments
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    My brother has just given me a couple of motors (working condition) that he got out of old battery powered drills , he said one of these motors should suffice ? we hooked them up to a 6volt m/c battery and they both ran at a steady rate
    any thoughts 👍

    💬 Re: Motor
    2 months ago by 🇨🇦 RodC ( Sub-Lieutenant)
    ✧ 71 Views · 0 Likes
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    In North America circa 2002 use of cordless drill power train was common in larger RC aircraft as the belt reduction cud swing a large prop. The nicad drill's battery gave a 3 to 5min flight with those brushed mtrs
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    💬 Re: Motor
    3 months ago by 🇬🇧 flaxbybuck ( Lieutenant Commander)
    ✧ 86 Views · 2 Likes
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    using a motor of unknown specification may have its problems so I would be wary of it. By all means give it a try (I would) but also, be prepared for the unexpected. Don't be disappointed if it doesn't work out 😉
    💬 Re: Motor
    3 months ago by 🇬🇧 dave976 ( Captain)
    ✧ 89 Views · 5 Likes
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    Hi marky
    It should suffice but may be quite heavy on current. That said with a large SLA for ballast it will probably last as long as you want to sail on any day.
    dave976
    📝 Static or ?
    3 months ago by 🇬🇧 marky ( Commodore)
    ✧ 102 Views · 12 Likes · 4 Comments
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    sorry its been a while, I didn't realise just how long it had been until I saw the last blog post ,due to circumstances I at this moment have a very low immune system so cant leave the house , so nows the chance to get on with the build .
    I now have the decision to make whether to bite the bullet and build her as a rc ship or plump for the old worn road of static .
    If I decide the rc route iI may be on quite a lot with questions .
    Question 1- how do you determine the length/diameter of the prop shaft .
    Question 2-the build guide says the motor. is a Como 500 with a 6:1 reduction gear ,is this the only motor I can use or are there any alternatives ?
    That's all for now
    all the best .
    cheers Marky

    💬 Re: Static or ?
    3 months ago by 🇬🇧 TerryH ( Warrant Officer)
    ✧ 97 Views · 1 Like
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    If your looking for a good motor then I would say look at the Torpedo 500 6.1 geared motor . best place to fit motor depends on what your building, tugs etc need there propshaft as straight as possible along the hull whereas fast types need propshaft at around a 10 degree angle
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    💬 Re: Static or ?
    3 months ago by 🇬🇧 marky ( Commodore)
    ✧ 95 Views · 0 Likes
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    Thanks Dave , having only built static previously it's a bit of a leap for me.
    💬 Re: Static or ?
    3 months ago by 🇬🇧 dave976 ( Captain)
    ✧ 97 Views · 5 Likes
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    Hi Marky
    We have several TID models in our club and I have a fibreglass hull (36") and plan purchased at the Boat Museum several years ago. I will build one day.
    You need to select the motor before fitting the propshaft as for best results you need to achieve a straight drive train. I would use a 555 brushed motor as this will give plenty of Tork with a 6v battery. As you can see from the plan the propshaft is basically parallel to the keel and needs to extend far enough into the hull to allow the motor to sit on its mount. It would be a good idea to fit the prop at the same time to ensure clearance at the stern. Its diameter should be less than the diameter of the motor and a 3 blade brass prop would work well. I'm sure the Como with a gear box would work but I suspect at greater cost and much heavier on the current drawn. The propshaft will need supporting at the engine end possibly with a block of wood secured to the floor/keel.
    Our TIDs use 555's and can run all afternoon on 6v 7Ahr sla's. NiMhs would work just as well. You will require quite a bit of ballast so the SLA works well for that purpose.
    dave976
    💬 Re: Static or ?
    3 months ago by 🇨🇦 RodC ( Sub-Lieutenant)
    ✧ 103 Views · 1 Like
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    There are always alternatives. I'm not familiar with the specs of your kit, the LOA for example. Everyone I sail with recommends brushless & LiPOs but I am still in the NiMH world with brushed for the most part. & I'm not much for shelf-looking-pretty models...so welcome to the water!!
    📝 Wood pack
    8 months ago by 🇬🇧 marky ( Commodore)
    ✧ 114 Views · 10 Likes · 2 Comments
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    Due to the new gaffer where I used to work frowning on homers , I purchased the wood pack from Sarik which arrived this afternoon its really nice wood and well cut , it consists of the keel, frames and deck (photos to follow)this is a Chine hulled tug and was fortunate when clearing out my late mothers house up the loft (attic) were a few old plywood tea chests in the need of some t.l.c .
    Cheers Marky👍

    💬 Re: Wood pack
    8 months ago by 🇬🇧 Colin H ( Fleet Admiral)
    ✧ 120 Views · 4 Likes
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    Last post should have read, teachests lovingly converted.
    Cheers Colin.
    PS, can't edit my posts.
    💬 Re: Wood pack
    8 months ago by 🇬🇧 Colin H ( Fleet Admiral)
    ✧ 120 Views · 2 Likes
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    TLC (teachers lovingly converted.)
    Love it shipmate, cheers Colin.
    📝 TID TUG
    9 months ago by 🇬🇧 marky ( Commodore)
    ✧ 162 Views · 7 Likes · 7 Comments
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    some pictures of the plans obtained from Sarik Hobbies (santa)

    💬 Re: TID TUG
    9 months ago by 🇨🇦 RodC ( Sub-Lieutenant)
    ✧ 132 Views · 2 Likes
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    Thank you for pointing me in a direction. Im really quite unfamiliar with most boat terms. Further to your help I did some research on "skeg" & found this which is also a keel extension but projecting downwards from the hull, faired a bit more than just a bearing at the base of the rudder
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    💬 Re: TID TUG
    9 months ago by 🇬🇧 Colin H ( Fleet Admiral)
    ✧ 134 Views · 4 Likes
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    Spot on Martin,
    Very useful on boats that sit on the bottom at low tide in shallow harbours.
    Cheers Colin.
    💬 Re: TID TUG
    9 months ago by 🇬🇧 Martin555 ( Fleet Admiral)
    ✧ 130 Views · 2 Likes
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    Hi marky,
    Looks you are going to enjoy that build.
    Good luck.
    I will be watching your progress.

    Martin.
    💬 Re: TID TUG
    9 months ago by 🇬🇧 Martin555 ( Fleet Admiral)
    ✧ 130 Views · 3 Likes
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    Hi RodC,
    I think it is called a 'Skeg'

    But knowing me I am probably wrong LOL!

    Martin.
    💬 Re: TID TUG
    9 months ago by 🇨🇦 RodC ( Sub-Lieutenant)
    ✧ 134 Views · 3 Likes
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    What do you call it where the bottom of the rudder is supported like that ??
    💬 Re: TID TUG
    9 months ago by 🇬🇧 marky ( Commodore)
    ✧ 139 Views · 4 Likes
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    Hi Fred , many moons ago before I retired I managed workshops at a university I'm going to pop in and see if they would be kind enough to laser cut it for me ,if not I'll go back and get the wood pack saying that the cost of ply and the wee bottle of Amber nectar i'm going to use as an inducement (bribe) the wood pack May work out cheaper.
    Cheers Marky👍
    💬 Re: TID TUG
    9 months ago by 🇬🇧 Fred ( Sub-Lieutenant)
    ✧ 139 Views · 1 Like
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    Hi Marky
    Did you also go for the wood pack?
    Fred


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