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SLord Nelson

gowest

704 posts

hi Rob

yes i did that in the hope that things would work better but time will tell i have completed the mods and run the engine and thing are not right but look a bit better as the engine runs for a short time before running out of steam pressure, but left for a minute it is soon off again. 

will do further testing to see how its going think there might be a steam leak somewhere need to look over the boiler.

RAF96

8108 posts


Community Moderator

It doesnt take much of a leak at this scale to loose pressure.

 

I recall chasing a leak on an aircraft that we had modified with a cargo door. It was bad enough to fail the leak rate test and one of our big sums guys worked out it only had to be a 1 square inch hole to leak away enough at proof pressure and that is taking account of the volume of a Gulfstream business jet sized fuselage. Needless to say it is easy to cumulate that area across plugs, control rod exit and wire loom sealing points.

 

Rob

Halton Brat - Running Win 10, 64-bit - RM (Pro-Pack) with Elite as Controller-A, Select as Walkabout and E-Link as Controller-B - Locos are mostly TTS. - http://myweb.cytanet.com.cy/honnor/

gowest

704 posts

Rob

leaks and the like are always a problem i can remeber a RADAR cabin that had 2 pipe connectors one for compressed air and one for water someone got it round the wrong way the wave guid was full of water the the cooling system was full of air could not switch on power luckly as flow switches were all wrong all lights and bells. 

stil this jobs not going well read on..........

Changes were made to correct the earlier problems and then some retesting could be carried out. As you can see in this picture the tender boiler in now lagged with some heat proof marital in the hope that heat will not be lost through the brass boiler casing.

Once more the water and steam oil was added and the engine left to make some steam pressure once the safety valves were lifting it was time to see what would happen. Off round my track it went and this time looked good I run the engine for a good 20 minutes and all was working well no steam leaks or water leaks and no short circuits.The new red flicker light was working ok so things were looking good so a longer run was under taken to see just how long this engine was going to run for with this larger tender boiler?

Every thing was checked out for this world record attempt. The engine set off at a good speed and was left to run the time was logged and when it stopped due to lack of water the time would be taken once more and this total time was 30 minutes about the same time as the Hornby engines so no improvement on running time. 

Then it was noticed that the red light PCB was burning out again and this was due to a steam leak on the main tender heater O ring seal it was clear that this idea was not going to work and that a change should be made to revert to the Hornby copper tube silver soldered in the boiler and the heater fitted in this sleeve.The tender boiler will need to be striped down and the copper tube added then try again.

RAF96

8108 posts


Community Moderator

Very smart with its overcoat on Ken. I hope it doesn’t make fitting the tender body difficult. If so you may be able to line the tender walls instead.

A shame the direct boiler heating doesn’t seem to work as well as expected. You have to try these things to find out though.

Rob

Halton Brat - Running Win 10, 64-bit - RM (Pro-Pack) with Elite as Controller-A, Select as Walkabout and E-Link as Controller-B - Locos are mostly TTS. - http://myweb.cytanet.com.cy/honnor/

gowest

704 posts

Rob what a great idea to lag the body not the boiler why didn't I think of that or if space do both just this minute finished making and soldering in the new heater tube but need a new heater as the old one has had it. Once that's fitted I can see what happens this time as I think the less than good long run might be down to very small steam leaks around the heater? 

ken

RAF96

8108 posts


Community Moderator

Pity you cant get silly foam in model sized tins, but you would have to be sure the job was AOK before filling the gaps.

Rob

Halton Brat - Running Win 10, 64-bit - RM (Pro-Pack) with Elite as Controller-A, Select as Walkabout and E-Link as Controller-B - Locos are mostly TTS. - http://myweb.cytanet.com.cy/honnor/

gowest

704 posts

Rob 

is that the foam filler in a tin for buildings ? Did some steam tests yeaster not bad but not good will try some video this after noon and post the out come all being well.

ken

RAF96

8108 posts


Community Moderator

Thats the stuff Ken, goes everywhere but where you want it

I’ve been using some expensive (€16 for 1litre) foaming PVA wood glue to relay some loose patio tiles. It sets waterproof by reaction with moisture in the air, etc including sea-waterproof and bonds just about anything to anything not just wood, which is good as I’m sticking marble tiles to concrete. Acid ran out here eats soft grout and cheap cement so everything falls apart after a decade.

Look forward to the test runs later.

Rob

Halton Brat - Running Win 10, 64-bit - RM (Pro-Pack) with Elite as Controller-A, Select as Walkabout and E-Link as Controller-B - Locos are mostly TTS. - http://myweb.cytanet.com.cy/honnor/

gowest

704 posts

 

I need to get some of that foam as I have a upvc back door to fit next week the old one falling to bits. Still have up loaded some video of the latest runs still think the tender boiler might need a new one as the coal area was larger then I thought could use this extra space and make it shorter so reducing the surface area and also bring the heater nearer to the centre of the boiler, still here's the link to the video.

https://youtu.be/OHC-3ras2Ws

RAF96

8108 posts


Community Moderator

Very impressive Ken, especially those drag race starts in slo-mo.

There is also just a quick flash at one point of the red light on the back of the tender.

Rob

Halton Brat - Running Win 10, 64-bit - RM (Pro-Pack) with Elite as Controller-A, Select as Walkabout and E-Link as Controller-B - Locos are mostly TTS. - http://myweb.cytanet.com.cy/honnor/

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