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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฆ๐บ Gt108 ( Master Seaman)
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I find that brushless outrunners far better than inrunners as no water cooling issues and leakage issues. They are well cooled by air as entire motor spins allowing cooling vanes to give cooling needed. Also lots more torque than similar sized inrunner.
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Remove Ads ๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง 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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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 175 Views ยท 3 Likes
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Works fine and looks great. That planking is very attractive. Pity to paint over it!
Rowen ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง JOHN ( Midshipman)
โง 178 Views ยท 7 Likes
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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 ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง Dickymint ( Recruit)
โง 176 Views ยท 0 Likes
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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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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 180 Views ยท 2 Likes
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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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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง Rogal118 ( Lieutenant Commander)
โง 181 Views ยท 1 Like
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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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๐ฌ Re: RAF RTTL 2762
3 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 162 Views ยท 1 Like
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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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Remove Ads ๐ฌ Re: RAF RTTL 2762
3 years ago by ๐ฌ๐ง nasraf ( Chief Petty Officer 1st Class)
โง 164 Views ยท 0 Likes
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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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๐ฌ Re: RAF RTTL 2762
3 years ago by ๐จ๐ฆ Rowen ( Captain)
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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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๐ฌ Re: RAF RTTL 2762
3 years ago by ๐จ๐ฆ Rowen ( Captain)
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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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๐ฌ Re: RAF RTTL 2762
3 years ago by ๐ฌ๐ง mturpin013 ( Admiral)
โง 160 Views ยท 0 Likes
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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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๐ฌ Re: RAF RTTL 2762
3 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 162 Views ยท 1 Like
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Should have added , good luck with build
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๐ฌ Re: RAF RTTL 2762
3 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 162 Views ยท 1 Like
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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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๐ฌ Re: RAF RTTL 2762
3 years ago by ๐ฌ๐ง nasraf ( Chief Petty Officer 1st Class)
โง 165 Views ยท 1 Like
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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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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 157 Views ยท 2 Likes
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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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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง nasraf ( Chief Petty Officer 1st Class)
โง 159 Views ยท 1 Like
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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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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 128 Views ยท 2 Likes
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It is! Also easier to sand when smooth though.
Have toyed with making another RTTL with double diagonal planking, just like the original. Perhaps one day! Rowen ▲
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Remove Ads ๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง mturpin013 ( Admiral)
โง 127 Views ยท 1 Like
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Its funny how we modelers try our best to achieve a perfectly smooth surface on our boat hulls, but in reality the hulls of real boats are far from perfect, it show very clearly on 2757 the angle planking towards the stern where the surface is still in tact
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 133 Views ยท 1 Like
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Using 2762 E. This was the original aluminium hull so felt, as the GF surface would be smooth, it would replicate this vessel more closely.
I did simplify the aerial arrangement to try to make it less vulnerable to damage. Found on another vessel that everytime an aerial was reattached the repair became more obvious. ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง nasraf ( Chief Petty Officer 1st Class)
โง 140 Views ยท 1 Like
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Great job but I am not sure that 2762 ever had that arrangement. When I was at Mountbatten in 196/62 the boat still had its aluminium hull showing, I think it had its timber outer skin added at that time. I was involved in the initial fitting the UHF radio to the RTTL at the time, when I finished my National Service in May 1962 it had only been fitted to one RTTL. Later pictures of these launches show that the UHF system was fitted to them and the mast was somewhat modified to fit the twin multi pole aerials and stays. Some pics of 2762 show it was fitted at some later time. Your new mast system also does not include the VHF aerial, it is possible later in the life of the RTTL the VHF system was removed and fitted with the UHF system because that was the intention for aircraft.
What number are you going to give it 2762E or 2772E ? ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง robbob ( Admiral)
โง 140 Views ยท 1 Like
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Unfortunately they are still outside and subjected to the ravages of the British weather. When I last saw them up close about two years ago they looked in a bit of a sorry state, certainly the hulls were but I expect the topsides to be in the same condition too โน๏ธ.
Rob ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 139 Views ยท 2 Likes
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Went there once some years ago, fascinating museam.
As an Engineer was enthralled by the Napier Sabre and Bristol Centarus engine cutaways. Marvels of complexity! The launches were stored outside and were deteriorating, there was a story about them going inside. Perhaps that has been done. ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง robbob ( Admiral)
โง 141 Views ยท 1 Like
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Hi Rowen.
I live very close to the Hendon museum and have visited it on many occasions over the years. In fact I attended the final closure of Hendon Aerodrome back in the late 60's and saw the last aircraft landing there (a Blackburn Beverly) after which the whole area was redeveloped for housing with only some historic buildings and hangers of the original aerodrome remaining for posterity. The museum was built as part of that redevelopment, and it has had a bit of a makeover in recent years and it's probably about time I paid a new visit, and take my grandchildren too. I'll also make sure to inspect the two RAF boats outside with renewed interest. Rob. ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ณ๐ฟ jbkiwi ( Fleet Admiral)
โง 146 Views ยท 1 Like
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Very nice work Rowen, obviously not an easy structure to make. Clever way you've made it detachable!
JB ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
โง 148 Views ยท 4 Likes
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"Anyway, I am not changing it!
Too many hours of fiddly work to contemplate another set of changes." Roger that Commander ๐ ๐ PS "a vertical centre shaft that might have rotated the radar" More likely power and signal cable, the rotation motor is right underneath the antenna. ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 147 Views ยท 4 Likes
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It could have changed and some pictures are quite deceptive. On some there appears to be a vertical centre shaft that might have rotated the radar.
I based my interpretation on various pictures of 2753, 2752, 2757 and 2762/72. Will admit that I did simplfy the antennas as often find they are very fragile and break off when the model is sailed. Anyway, I am not changing it! Too many hours of fiddly work to contemplate another set of changes. Thanks for your endorsement of my efforts, always appreciated. Best Rowen ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
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Remove Ads ๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐จ๐ฆ Rowen ( Captain)
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Hi Doug , Quite deceptive but it is a tripod mast. Examined several photos that confirm it
Rowen ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
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Very nice work Rowen ๐
But (and I hate to say it ๐ค) aren't you missing a back leg on the mast? Or is what looks like a second back leg on 2757 actually a central tube running up to the radar? Cheers, Doug ๐ ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง Northernflotsam ( Master Seaman)
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long time since Ive seen Lake Ontario back in UK use to live in Oakville in the 90s
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Remove Ads ๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง swanee ( Master Seaman)
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When my uncle Bob was stationed in Malaya with the RAF he along with some other officers used to blag an outing on an RTTL. once they got a few miles out it was finished with engines and everyone would spend the day fishing or sunbathing. All in the name of Queen and country of course.๐
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ณ๐ฟ jbkiwi ( Fleet Admiral)
โง 115 Views ยท 0 Likes
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Hi Rowen, another great looking model, looking forward to the video etc, once you get some 'soft' water back.
JB ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง mturpin013 ( Admiral)
โง 120 Views ยท 1 Like
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Hi RH, another boating success, what a great model, we will look forward to seeing some action pictures.
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐จ๐ฆ Rowen ( Captain)
โง 124 Views ยท 1 Like
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Hi Roger, good to see you back.
The lines of both the RTTL Mk 11 and the Brave Borderer are similar, after all they were both Vosper products. As I built the RTTL often noticed how much the hulls looked the same. The big advantage of the RTTL Mk 2 is they were eventually all twin screw, unlike the Brave. This is a major saving on complexity, cost, weight and general aggravation. I think it a very doable project. If you decide to go further, can send the RTTL General arrangement drawings. Can you send a note with your E mail address please? Think already have it but want to be sure. Cheers Rowen ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง Rogal118 ( Lieutenant Commander)
โง 126 Views ยท 3 Likes
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Wow you have been busy, hope the water is sailable soon.very nice clean lines not as much deck clutter as the borderer.is the hull similar to the borderer Rowen, as I've got my original i made last year then went and bought a glass fibre hull for my now nearly finished borderer,I was toying with the idea of building a rttl 2755 as the contrast with the white hull and superstructure would compliment the brave border. One if done something like the enclosed photos with the sun shade would make for an interesting model! Thoughts please?. Regards Roger.
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
โง 126 Views ยท 1 Like
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Another fine job Rowen ๐
Looking forward to The Big Melt! ๐ Cheers, Doug ๐ ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง Skydive130 ( Rear Admiral)
โง 47 Views ยท 1 Like
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Looks superb on the water!
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Remove Ads ๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง nasraf ( Chief Petty Officer 1st Class)
โง 74 Views ยท 1 Like
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Glad to see a bit of history recorded and achieved, you have done a great job.
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฌ๐ง Northernflotsam ( Master Seaman)
โง 80 Views ยท 0 Likes
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Very nice.. looks good
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐จ๐ฆ Newby7 ( Fleet Admiral)
โง 80 Views ยท 1 Like
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Nice. Looks good on the water.
Rick ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ฉ๐ช RNinMunich ( Fleet Admiral)
โง 90 Views ยท 2 Likes
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Vroom vroom Rowen ๐
She looks reeeeel nice on the wet stuff ๐ ๐ ▲
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๐ฌ Re: RAF RTTL 2762 E
3 years ago by ๐ณ๐ฟ jbkiwi ( Fleet Admiral)
โง 88 Views ยท 2 Likes
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Looks good Rowen, rides nicely by the looks of it๐
JB ▲
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