Frank Skilbeck Posted January 21 Share Posted January 21 Found a new in box OS 35 control line engine, loop ported, no silencer. Seems a shame to bin it, but is there a market for it? Quote Link to comment Share on other sites More sharing options...
MikeQ Posted January 21 Share Posted January 21 (edited) Yes Someone on Barton Control Line site would quite possibly snap your hand off depending on condition. Failing that, I have a Mercury Cobra it would fit in nicely 😀 Mike Edited January 21 by MikeQ 1 Quote Link to comment Share on other sites More sharing options...
Rich Griff Posted January 21 Share Posted January 21 Bin it !!!!!! ? No.......!!!!!!!!!! Yes, Barton site, or give it to mikeq...... The box says RC ? If not, ( strangled exhaust ? ) The inlet casting looks as if it could be Rc'd relatively easily ? Don't bin it, giving it to someone ( even for a fiver ) who would use it, makes much better sense, to me at any rate. Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted January 21 Author Share Posted January 21 Rich, must have been put in the wrong box, it's a cast in venturi inlet. Mike, it's un-run and turns over smoothly, I'll post a couple more photos. Quote Link to comment Share on other sites More sharing options...
MikeQ Posted January 21 Share Posted January 21 (edited) Hi Frank a lot of these old motors look like junk compared to modern motors but one mans meat is another mans poison and all that. There were and are a lot of CL kits/designs aimed specifically at the OS35 and similar motors. Max power isn’t necessarily whats wanted for these models. Tractability and predictable behaviour are more important. in good condition it will be a very useful motor to the right people. Control Line is still on the go ... although only practiced by masters of dark arts. A bit like Freeflight (and no, I don’t mean the FF nonsense after hours at the RC nats🤣) its definitely not one for the bin. Put it on ebay or Barton Control Line site for sure. https://www.ebay.com/itm/125953046581 Edited January 21 by MikeQ Quote Link to comment Share on other sites More sharing options...
Manish Chandrayan Posted January 21 Share Posted January 21 32 minutes ago, Frank Skilbeck said: Rich, must have been put in the wrong box, it's a cast in venturi inlet. Mike, it's un-run and turns over smoothly, I'll post a couple more photos. I have one that came to me in NiB condition and the box is marked RC. Could it be that the box for RC/CL was common? Quote Link to comment Share on other sites More sharing options...
MikeQ Posted January 21 Share Posted January 21 Maybe ... not sure. Quote Link to comment Share on other sites More sharing options...
Rich Griff Posted January 21 Share Posted January 21 (edited) Also, is there a ripmax sticker, price on box, and any indication as to year ? When was the more or less transition year from loop scavenge deflector piston type to shnerle porting type for model 2t glow engines, late 70's...? Cox engines were made in their millions way before the 70's.....did they know something os did not ? Or is a Cox bb 049 a baffleless loop scavenge type engine ? I will ask on cef... Model diesel ( ci ) engines had already gone down the shnerle route many years before, possibly from the very beginning, apart from fixed compression types ??? Shnerle porting had been about for some time in the non model engine world at that time...the late 70's...... Edited January 21 by Rich Griff Quote Link to comment Share on other sites More sharing options...
Robin Colbourne Posted January 21 Share Posted January 21 (edited) That looks like the OS Max-III 35 from 1960. The odd thing is that the photographed engine in this test report doesn't have the slight bellmouth on the venturi casting that Frank's engine has, althoug hthe drawing shows it. Generally non-RC glow motors of this size are of more interest to collectors (and vintage control line fliers than the equivalent R/C (throttled) versions. February 1958 Model Aircraft Test Report - OS Max-II 35 Frank's box looks newer than the engine to me. Edited January 21 by Robin Colbourne Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted January 21 Author Share Posted January 21 (edited) Few more pics, looking through the exhaust port the piston definitely has a wedge shaped deflector, also the glow plug is offset too. It's definitely a 3, it's cast in. Edited January 21 by Frank Skilbeck Quote Link to comment Share on other sites More sharing options...
Robin Colbourne Posted January 21 Share Posted January 21 (edited) My apologies Frank. I didn't update the link when I edited the text. This is the right one for the model III. The text mentions a special cylinder head for the R/C version, maybe the R/C one doesn't have the offset plug? September 1960 Model Aircraft - Test Report - OS Max-III 35 Edited January 21 by Robin Colbourne 1 Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted January 21 Author Share Posted January 21 (edited) Robin, thanks for that. Only one venturi insert (fitted) with the one I have. Edited January 21 by Frank Skilbeck Quote Link to comment Share on other sites More sharing options...
mikem65d Posted January 22 Share Posted January 22 We use this Model ( III) in our Free Flight nostalgia events. Once it's worked over by our guru over here it pulls like a monster. It's one of OS's best during the production time. Goes for mint price too. Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted January 22 Share Posted January 22 This any good ?.https://sceptreflight.com/Model Engine Tests/OS Max-III 35.html Quote Link to comment Share on other sites More sharing options...
PatMc Posted January 22 Share Posted January 22 17 minutes ago, Paul De Tourtoulon said: This any good ?.https://sceptreflight.com/Model Engine Tests/OS Max-III 35.html Nah ! the one Robin gave yesterday is better. 1 Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted January 22 Share Posted January 22 1 hour ago, PatMc said: Nah ! the one Robin gave yesterday is better. Opps I didn't look at Robins, Quote Link to comment Share on other sites More sharing options...
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