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OS 40 FS pre Surpass

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Martin Arnold 117/04/2020 15:22:53
21 forum posts
3 photos

Hi Guys.

Don't suppose anyone has one of these lying around, only need the pipe 7mm OD, it's from an OS 40 FS pre Surpass,

Cheers.40fs exhaust.jpg

Jon - Laser Engines17/04/2020 15:45:27
5513 forum posts
268 photos

I just rebuilt one of these and it had no exhaust so i just used one i had kicking around from an old 52. if you cant find one just grab a 52 fs muffler kit from just engines.

Paul Marsh17/04/2020 15:49:44
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4032 forum posts
1219 photos

I've got 5 kicking around. they were off the OS Radial,same ones, but used a collector ring instead.

Jon - Laser Engines17/04/2020 16:10:17
5513 forum posts
268 photos
Posted by Paul Marsh on 17/04/2020 15:49:44:

I've got 5 kicking around. they were off the OS Radial,same ones, but used a collector ring instead.

arent those bigger? my asp radial uses the same 11x.75 thread as a 90 fs and i think my FF240 and 320 do as well.

Denis Watkins17/04/2020 16:17:06
4459 forum posts
113 photos

The 40 is

10mm x .75 thread

Martin Arnold 117/04/2020 16:57:24
21 forum posts
3 photos
Posted by Paul Marsh on 17/04/2020 15:49:44:

I've got 5 kicking around. they were off the OS Radial,same ones, but used a collector ring instead.

Perhaps you could measure one of the pipes, as I said this one is 7mm OD.

Thanks.

Steven Webb (Steve Webb Models)17/04/2020 17:01:49
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299 forum posts
103 photos

The FS 40 ( one of the best engines OS ever produced IMO) uses the same exhaust pressure adaptor ( some call it a silencer) as the 20 & 26 OS engines. I think the ASP, SC 52 fits. Sometimes the OS version turn's up on eBay.

They can go for surprisingly high prices. Have you tried Just Engines? I sold a new one in its packet a few years ago. It was a spare I had and the auction went over £20 - I was amazed and wished I'd bought 20 off them when they were available. LOL.

The pressure adaptor ( which some think is a little Muffler) is best left off. It does nothing to quieten the engine as its quiet to start with. Its not high power like later generation OS engines. The FS 40 sets up better and runs better off pressure.

FS40 OS - 1982 - First version had a spring needle. Like a control line or stunt engines Needle. Flexible. Later versions had the grey shorter Needle. Like on the Surpass 40

 

Steve

Edited By Steven Webb (Steve Webb Models) on 17/04/2020 17:04:46

Martin Arnold 117/04/2020 17:24:58
21 forum posts
3 photos

The slight problem I have, is that this is one of two fitted to a DB Super Trouper Twin, It would become rather expensive to replace both exhausts (£60-70 for two systems) and I don't want to have odd exhausts on a twin, which is why I'm trying to find a header for this one from somewhere.

Have spoken to JE, no luck.

There is a rather nasty one on Ebay at the moment at £54.00 with an hour or so to go, but this seems like too much for dog !!

Thanks for your input.

 

Edited By Martin Arnold 1 on 17/04/2020 17:26:00

Keith Sharples17/04/2020 18:19:23
154 forum posts
2 photos

Hi Martin. I have just PM you. I have one. All the best Keith

Martin Arnold 117/04/2020 18:33:57
21 forum posts
3 photos
Posted by Keith Sharples on 17/04/2020 18:19:23:

Hi Martin. I have just PM you. I have one. All the best Keith

Thanks again Keith, have replied.

Martin.

Keith Sharples17/04/2020 19:01:53
154 forum posts
2 photos
Posted by Martin Arnold 1 on 17/04/2020 18:33:57:
Posted by Keith Sharples on 17/04/2020 18:19:23:

Hi Martin. I have just PM you. I have one. All the best Keith

Thanks again Keith, have replied.

Martin.

I have replied all the best Keith

Martin Arnold 123/04/2020 13:18:42
21 forum posts
3 photos

Thanks so much Keith, the pipe is fitted and my twin is ready go...........When we are let out of course !!

This has lifted my spirits no end in these dark days of doom and gloom, to be in receipt of such a kind gesture.

super trouper.jpg

Nigel R23/04/2020 13:32:07
avatar
3932 forum posts
685 photos

Twin four strokes, must sound great in flight.

Martin Arnold 123/04/2020 14:28:34
21 forum posts
3 photos

Yes it does, it quite surprised me when I first set the plane up how much power the little 40's running together have, mind you it has quite a light wing loading being 72" span and weighing 7.5lbs

Haven't flown it for years, an old flying buddy of mine built the airframe for me from a Dave Boddington plan about 15 years ago and I did all the installation. I was just preparing it for an outing with new bearings in the motors and a good fettling............When all this lot happened.

Keith Sharples23/04/2020 15:14:00
154 forum posts
2 photos
Posted by Martin Arnold 1 on 23/04/2020 13:18:42:

Thanks so much Keith, the pipe is fitted and my twin is ready go...........When we are let out of course !!

This has lifted my spirits no end in these dark days of doom and gloom, to be in receipt of such a kind gesture.

super trouper.jpg

Wow, what a brilliant looking model Martin, and it's good to see the exhaust part on it. I bet it will sound awesome with two FS40s purring away. I loved the sound of the one I did havecrying 2 which the part is off.

extra slim23/04/2020 15:42:55
490 forum posts
49 photos

most of us modellers are hoarders, but Keiths gesture and resultant delight in contributing to the end product is refreshing... I salute you Sir Keith of Sharples.. yes

Martin Arnold 123/04/2020 16:11:21
21 forum posts
3 photos

Well said extra slim !!

Jon - Laser Engines23/04/2020 18:17:34
5513 forum posts
268 photos

Martin, can we get a little video of the engines singing together? Might upset the folks next door but a little music might brighten up the forum

Martin Arnold 123/04/2020 18:46:22
21 forum posts
3 photos

Jon - Laser

Will see what I can do....... Having replaced the bearings in about six engines and tested them (4 Saito and 2 OS only run four strokes these days) in the last 2 weeks, the neighbours are used to the music, they probably think they are some sort of garden tools !!!

Edited By Martin Arnold 1 on 23/04/2020 18:46:58

Edited By Martin Arnold 1 on 23/04/2020 18:47:56

Jon - Laser Engines24/04/2020 12:52:02
5513 forum posts
268 photos

I am pondering digging out all of my models and giving the engines a quick run up. I was worried about the noise but one neighbour essentially shrugged his shoulders and said it was my garden and i choose what i want to do in it.

I think i will run them in phases over a few weeks. Get some of the little ones done first and then move on to the big ones. They wont need to run long. Just enough to get them hot and flush some new oil through them.

I might make a video series. Lockdown engine testing, perhaps it will catch on?

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