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Rear Exhaust engine for sale

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Peter Christy24/02/2018 18:18:29
1880 forum posts

My interests in classic aerobatic models is firmly in the "Taurus" era, but I know many later classic models used rear exhaust engines and tuned pipes. I've been assisting the widow of a deceased modelling friend dispose of his assets, and amongst them I've found a pristine YS 61 pumper, rear exhaust. I may also have found a pipe for it, but not the manifold adapter (yet!).

I haven't advertised this anywhere yet as I thought it may be of interest to someone here, so I'm offering it here first.

If anyone wants further information, please message me and I will answer as best I can.

All I know about YS is that my son used them in preference to OS in Helicopter F3C contests, as they worked, whereas the OS "C" spec didn't - well, not reliably, anyway!




Robert Welford24/02/2018 19:14:33
223 forum posts
4 photos


What version of YS 61 is it? Does it have a round head, or more square head? The Ys 61 LS (long stroke) had a square head.

Nigel R24/02/2018 20:31:06
4090 forum posts
694 photos
Interested, whatever version it is.
Peter Christy25/02/2018 09:58:56
1880 forum posts

The engine is still over at Jill's. I'll pick it up on Monday and put some pix up. Its still in the box and appears un-run.

I'm not an expert on YS engines, other than being able to recognise one, but this one stood out because of the rear exhaust - which might suit some of the later "classic" aerobatic designs.

More info will follow when I pick the engine up...



Peter Christy25/02/2018 12:49:18
1880 forum posts

Managed to get over and pick the engine up this morning, so here's an update (and a bonus!):

The label on the box says "FRH", implying its a helicopter engine. However, it doesn't have a heatsink head, just the ordinary round one (not a long-stroke, then?). The needle valve and pressure regulator are present, and the engine has clearly never been run.

It looks like it was one of a pair, as there was a second box that contained prop washers, etc, so the other one may have been in a helicopter that has already sold.

Rear exhausts were not common on heli engines, and on most heli engines, the only difference was the fitting of a heatsink head to assist with cooling. If this is a heli engine, I wouldn't worry! It should work equally well in a fixed-wing aircraft.

Now for the bonus! I also found this:

Its an OS61-RF-HS, also brand new and un-run! This definitely is a heli engine, but again, the rear exhaust layout is not popular in helis, and the heatsink head may be advantageous in a fully cowled engine. Many later "classic" aerobatic designs seemed to use cowled engines and tuned pipes, so again, this may well be of interest to anyone building such a model.

I'm in South Devon if anyone local is interested in examining the merchandise, otherwise I'll answer any questions to the best of my ability.

The modern equivalent of these engines sell for well north of £200. Obviously these are worth what someone is prepared to pay, but I would hope to realise around 50% of their new price as a guide. The money will go to the deceased's widow.

Thanks for looking!




Edited By Peter Christy on 25/02/2018 12:52:10

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