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    RAF RTTL 2762 E
    by RHBaker πŸ‡¨πŸ‡¦ ( Lieutenant Commander)
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    3 Posts 17 Comments 0 Photos 19 Likes
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    πŸ“ RAF RTTL 2762 E
    7 days ago by RHBaker ( Lieutenant Commander)
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    The next problem was both Turnigy ESCs burnt out! Not simultaneously, but in quick succession. Have no idea why. They were well protected by fuses and generously sized for the motors and screws.
    Anyway, HobbyKing refunded the purchase. Obtained two more ESCs, but this time from Banggood. Had several premature Turnigy failures last year; time to try something else.
    The Banggood ones worked straight out of the box. They do not require programming and operate simply in Fwds or reverse; no beeps, punch mode, throttle setting or other complications.
    Just as well as my Turnigy ESC programming card had, by now, also failed!
    These ESCs are basic and do not have a low voltage alarm or cut-off. When using LI-Po batteries it is essential one be added to protect LiPo cells from inadvertent full discharge damage.
    Once these ESCs were installed was immediately impressed at the improvement in control. They could be fully modulated from the Tx lever. The Turnigy ones were much coarser and the hull could not be safely docked, it can now.
    The drivetrain trials and tribulations were resolved, the model sailed well throughout several runs. It is not as fast as the Brave Borderer, but with only two screws it is lighter and easier to control. It also planes easily.
    Although the original vessel had twin screws that rotated in the same direction, decided to cheat and install contra-rotating screws. Experience with the Brave B. steering shows it is sensitive and felt this might make the model more predictable and also reduce any β€œdigging in” tendency on turns.
    Quite enjoy running a bare hull as it is not susceptible to minor damage. All marks can be cleaned off during the build programme.
    Parked the model for the onset of the winter, when will complete it. The pictures show the final tests in Hamilton Harbour.
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    πŸ’¬ Re: RAF RTTL 2762 E
    6 days ago by RHBaker ( Lieutenant Commander)
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    Interesting. The ones I bought are watercooled, so there is no heating issue.
    They do not look as substauntial as the Turnigy but they do work well.
    Fitted three into my Brave Borderer and have no issues at all.
    Good luck anyway with them.
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    πŸ’¬ Re: RAF RTTL 2762 E
    6 days ago by nasraf ( Chief Petty Officer 1st Class)
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    Sorry about the failure of your ESC's lucky you got your money back.

    I do not know much about them, but I have lost a couple for no apparent reason.

    I have bought 3 off Aliexpess and run them just with a bare motor and they seem to heat up quite quickly so when at last I finish my HSL I will try and arrange some cooling for them, the heat sinks do not look very substantial.
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    πŸ“ RAF RTTL 2762
    14 days ago by RHBaker ( Lieutenant Commander)
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    Purchased, about this time last year, a glass fibre hull from MTBHulls. Have used their products before and been very pleased with them. Prefer to use GF hulls on these faster models are they are so robust.
    Proceeded through the Spring and Summer to fit the twin-screw brushless drivetrain, so it could be thoroughly tested before the deck was installed. Have found, through bitter experience, this is the easiest way to commission a brushless motor installation. It allows much better access to adjust or replace components. My caution proved well founded!
    Obviously, running on open water without a deck runs the risk of the model filling and sinking. To address this, fitted inside the hull old plastic water bottles and some air-filled sealed plastic bags usually used for protecting fragile shipments. Had earlier calculated the buoyancy given by these items, so it did exceed the hull weight.
    On the first runs, found the Turnigy water cooled brushless motors leaked water heavily. Possibly exacerbated by the pump circulated water-cooling system. This is evidently a well-known problem and even described on YouTube!
    Fortunately, easily cured by applying sealant to the area around where the wires emerge. Access was too limited to do this in situ, so removal and bench repair was the easiest approach
    To be continued
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    πŸ’¬ Re: RAF RTTL 2762
    9 days ago by RHBaker ( Lieutenant Commander)
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    I seem to have been able to get back to the start but also have the Build as a document. Problem is you need both the Build doc and the pictures on the blog to get the full story.
    If there is any particular area you are interested in let me know and can see what I have.
    Unfortunately have been through a couple of computers since the story started and hope everything transferred properly.
    Rowen
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    πŸ’¬ Re: RAF RTTL 2762
    9 days ago by nasraf ( Chief Petty Officer 1st Class)
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    Thanks very much for the info.

    I have gone back a long way on your Brave Borderer saga but I cannot get back to the start. I notice this with my first build logs. I assume this is due to the system memory size or perhaps things are still in the old Fireboat site I expect someone out there knows the answer.
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    πŸ’¬ Re: RAF RTTL 2762
    13 days ago by RHBaker ( Lieutenant Commander)
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    Look good, would have been useful six months ago! Think have gleaned most of the details now from other drawings or the web.
    Rowen
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    πŸ’¬ Re: RAF RTTL 2762
    13 days ago by RHBaker ( Lieutenant Commander)
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    These were the Turnigy 3520 1700kv type. Never took any pictures as the repair is quite simple.
    The water comes up the wiring holes and is thrown out by the outrunner body rotation.

    The is a good video on U tube of somebody actually dismantling a motor to effect a repair.
    Others just use silicone, whch is what I did. It works fine.
    Advised HK, but never bothered to claim as the repair was simple and cheap.

    Have always used a pump, possibly redundant as a scoop might work just as well.
    With a pump have no concerns with the cooling. Only a cheap fish tank one, costs about 7$.
    Rowen
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    πŸ’¬ Re: RAF RTTL 2762
    13 days ago by mturpin013 ( Commodore)
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    "Turnigy water cooled brushless motors leaked" I wasn't aware this could be a problem, where exactly do they leak? a picture please.
    why was it necessary to have a pumped system, wouldn't a prop forced system suffice.
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    πŸ’¬ Re: RAF RTTL 2762
    13 days ago by JOHN ( Chief Petty Officer 1st Class)
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    hi there whilst going through some old computer files; I came across these 2 scans which may be useful to anyone who is refurbishing or building an RAF - RTTL.

    John
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    πŸ’¬ Re: RAF RTTL 2762
    13 days ago by RHBaker ( Lieutenant Commander)
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    Should have added , good luck with build
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    πŸ’¬ Re: RAF RTTL 2762
    13 days ago by RHBaker ( Lieutenant Commander)
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    The shaft is fully enclosed in a brass tube. There is another brass sleeve that allows the prop shaft tube to slide into the hull. Find this simplifies the shaft alignment. My Brave Borderer blog explains the rational.
    The prop bracket is a home made sleeve where the shaft is soldered in and at the open end is a small top hat nylon bush.
    Props are from Cornwall Model boats and are Raboesch 162 style.
    Think you are wise to go with single prop. The triple arrangement is complex!
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    πŸ’¬ Re: RAF RTTL 2762
    13 days ago by nasraf ( Chief Petty Officer 1st Class)
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    I really liked the look of prop and shaft installation. I shall throw away my cheap installation plans on the HSL 100, that at present lies untouched for the last 8 months on my lounge floor and make something more impressive like your drive system.

    From the picture it looks like the prop shaft threads through a brass tube in the hull and then to the stern support bracket/bearing. With a bit of the rotating shaft exposed to the water is this correct.

    I like the look of your prop, where did you get it ?

    Although the HSL 100 had 3 Sea Lions to push it along I am taking the simple route of one motor and one prop shaft. You have given me and the thought that it will not be so cold in my garage soon, the inspiration to get on with my build.
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    πŸ“ RAF RTTL 2762 E
    23 days ago by RHBaker ( Lieutenant Commander)
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    Decided to build a model of an RAF Rescue and Target Towing launch (RTTL) as my next project.
    Spent much of the winter and Covid lockdown period working on this 1:24 scale model. As the build closely follows my earlier Brave Borderer project, will only describe significant differences or areas of interest.
    The original vessel was designed and built by Vosper in the U.K. for the Royal Air Force in the early 1950s.This Mk 2 RTTL version, was eventually powered by 2 x Rolls-Royce Sea Griffon engines (the Griffon, although a similar style engine to the Merlin, was not a development of it).
    The one I chose to model was 2762E. This originally had an aluminium plated hull and was built for experimental purposes to evaluate this feature. The β€œE” in the pennant number depicts β€œExperimental”. The R.A.F then realized it already had a 2762 vessel, one captured from the Germans! She was renumbered as 2772E.
    In service it was found the aluminium sheathing corroded quickly in the salt water. She was then resheathed in double planked mahogany, just like her sisters. The pennant number then also became plain 2772.
    In the original guise this hull was both lighter and had a smoother surface finish than usual, so was capable of over 50 knots. The standard vessel topped out at around 47 knots.
    Planned to use a glass fibre hull. The smoother surface of GF would more closely replicate this particular vessel and would thus give an ideal opportunity to capture a unique period in her life. Also wanted to capture a version with the low engine room hatch, although 2772 was later converted to the raised glazed version.
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    πŸ’¬ Re: RAF RTTL 2762 E
    21 days ago by nasraf ( Chief Petty Officer 1st Class)
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    I can remember 2762E from my time at Mount Batten ( 1961 to 1962 ) mainly because of the E suffix. I think from memory, its a long time ago now, that it spent all its time out of the water and possibly is when it had the timber cladding added. At the time I did not realize that it was a prototype its only since I became interested in this site, as like many others and was drawn here when restoring my Fire Boat.
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    πŸ’¬ Re: RAF RTTL 2762 E
    22 days ago by RHBaker ( Lieutenant Commander)
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    Works fine and looks great. That planking is very attractive. Pity to paint over it!
    Rowen
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    πŸ’¬ Re: RAF RTTL 2762 E
    22 days ago by JOHN ( Chief Petty Officer 1st Class)
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    hi there

    Regarding a smooth hull for the RTTL Launch - when I built mine - I double diagonally planked the hull. For the inner planking I used obechi strips; at 45 degrees to the keel. The outer planking was 4mm wide x 0.5 thick mahogany strip in the opposite direction. Then I smoothed it off and applied 3 coatings of Z-Poxy finishing. Then with rubbing down between coats - then just standard Humbrol enamel paint. I also used 2 Vision motors to drive 30 mm scale props - they rotated in the same direction - powered by 7.2 volt batteries.

    I put 2 pics of the hull under construction. I have also put a 3rd pic on which should be a video (fingers crossed it works).

    John
    video 1558266007
    ▢️
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    πŸ’¬ Re: RAF RTTL 2762 E
    22 days ago by Dickymint ( Recruit)
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    My father was stationed at List on Sylt in the '50's when the RAF ordered 5 96' boats to be built by a German shipyard. These were numbered D2762 to D2766 when they entered service hence the 2762E number problem. Interesting boats with Maybach diesels, but they just didn't stir the senses like the 68' launches!
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    πŸ’¬ Re: RAF RTTL 2762 E
    23 days ago by RHBaker ( Lieutenant Commander)
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    Hi Roger,
    Doubt a raw Doncaster is any rawer that a cold and snowy Ancaster! Been inside all day catching up on unfinished boat projects.
    I think you will find going to Brushless and LI-Po is well worth the trouble when building fast launches.
    The power density is much better than anything else and brushless do convert it into noise and speed quite well!
    Once you get closer to the project drop me a line and can give the benefit of the lessons I have learnt.
    Should be worth a round of drinks next time we can get to Yorkshire!
    Take care and good luck
    Rowen
    ce o. The power
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    πŸ’¬ Re: RAF RTTL 2762 E
    23 days ago by Rogal118 ( Chief Petty Officer 2nd Class)
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    Good evening from a raw Doncaster
    Well Rowan you certainly know how to put the cat among the pigeons. I've been wondering for 8 months now what to do with the original hull I made for the brave borderer, at the time of making I couldn't get my head around the fibre glassing, so left to one side and chose the easy way out and bought a grp hull.
    So always on the search for my next project maybe now is the time to go lipo and out runners with this type and I get to use the mothballed brave hull, once I've got the "Orca" nearly finished.
    Once again thanks for your inspiration
    Regards Roger
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