bruce chapman Posted October 20, 2012 Share Posted October 20, 2012 Hi, Having a interest in engines, and anything mechanical, I find myself the proud winner of a circa 1980's OS/Graupner 49pi wankel motor. Given the fact that I would have been strutting my new romantic stuff when this was produced, it seems to be in good fettle. ( Unlike myself, now in comfy slacks!) I have run it up, and it seems to produce plenty of smooth power, with a lovey cackle at tickover. My only real concern is the amount of castor based fuel it consumes! I am after any relevant info on this motor, and any recomendation for a suitable model to fix to it. I am in the process of building a 'mini panic' from avicraft. ( An excellent model and company) . My Intention was to fit it to this, but the fuel tank size is pretty limited for the thisty beast- well- would be ample for recommended .30 size 2 or 4 stroke. ciao Quote Link to comment Share on other sites More sharing options...
Former Member Posted October 20, 2012 Share Posted October 20, 2012 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
bouncebounce crunch Posted October 20, 2012 Share Posted October 20, 2012 I got the cane for saying "you bunch of Wankels" to a few classmates and laughing about it, none were from mechanical backgrounds, not even the teacher knew what a Wankel was. is there an online manual for her? Quote Link to comment Share on other sites More sharing options...
Former Member Posted October 20, 2012 Share Posted October 20, 2012 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
John Olsen 1 Posted October 21, 2012 Share Posted October 21, 2012 Is there some reason why a picture of my Saito appears at the top of this thread? At least it does for me. It is certainly not a Wankel! Anyway, one guy in our club has a couple of these, if I can remember who I could see if he has any words and music for them. They are heavy on fuel because Herr Wankel was labouring under a misapprehension when he decided that rotary motion would be more efficient than reciprocating motion. So the Wankel ends up more compact, but a bit hungry on fuel. John Quote Link to comment Share on other sites More sharing options...
graeme jones Posted October 26, 2012 Share Posted October 26, 2012 Yes I've got a couple of 49PI's (destined for a twin one day) and have flown them in a couple of aircraft. They are different to either a 2 or 4 stroke glow in several respects. Vibration is low, fuel consumption is high and they are much happier swinging small props at high RPM than larger props at lower revs. I've used 8X6, 9X6 and 10X4. My Limbo Dancer, used to run them in, goes like a rat up a drainpipe but the 49PI sucks the 4oz tank dry in less than 4 minutes, not all of it on full power. If you think of these engines as a 3 cylinder 4 stroke with the pistons geared UP to the crankshaft, you'll get some idea of why they behave as they do. Graeme Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted October 26, 2012 Share Posted October 26, 2012 I had one for a time, very nice and powerful, Wish I still had it. Not sure that castor based fuel is a good idea, if it ever congeals you will have a lot of trouble clearing it out of the vane seals. Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted October 26, 2012 Share Posted October 26, 2012 Got 6 of them. 5 New ones, and one Mk1. Stay away from the mk1, but the mkII and the latest ones are good. Here's how they work: Edited By Paul Marsh on 26/10/2012 22:15:58 Quote Link to comment Share on other sites More sharing options...
Dave Bran Posted October 27, 2012 Share Posted October 27, 2012 Ah, the sheer nostalgia, the tip seal issues, the horrendous oil consumption almost equalling the atrocious fuel consumption, the dodgy NSU Ro80............ That Saito four stroke picture leading this thread, is that a Freudian slip??? Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted October 27, 2012 Share Posted October 27, 2012 I have noticed that the Mk 1 has the carb in front of the "Cylinder while the mark 2 has it on the cyclinder beside the exhaust. Then they seem to have reverted back to the front carb for the mark 3 How can I tell a mark 1 from a mark 3 from pictures? Quote Link to comment Share on other sites More sharing options...
james higgs Posted October 30, 2012 Share Posted October 30, 2012 I have a Wankel myself and during side by side testing it produced the same power as my Webra .40 Blackhead; it is very powerful for its capacity but sadly it turned out not to be very practical for sports models due to the fuel consumption. It's a beautiful piece of engineering and I have the manual for it if anyone needs a copy I can scan it and send it to you. My engine will appear on Ebay within the next few days so get ready to bid!. Quote Link to comment Share on other sites More sharing options...
bruce chapman Posted July 15, 2013 Author Share Posted July 15, 2013 Thanks to all for input- now running well in a great planes Corsair fun fly. It realy rips! vertical hand launch no problem- usualy! Ive had about a dozen tank fulls out of her (12oz / 6 mins) running on contest 10. ( the instructions rec castor based fuel- but I think these were written before the advent of synthetic!) Its happy swinging 10x 4. Completely love it, and been complemented by quite a few on the sound it creates- sounds more like a multi cylinder howl at full chat than anything else, and has a quite pleasant missfiry burble at the low end- which has been pretty reliable thus far. I am using a remote needle valve from an OS 46ax conected to existing valve on a very rich setting. - Very close to prop- for my fat digits anyway! Can't big it up enough- I will post some pics Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted July 16, 2013 Share Posted July 16, 2013 Glad you are having such fun. I agree, sound is great, masses of power but very thirsty. but mine lasts for longer on a 6 ounce tank Edited By Peter Miller on 16/07/2013 08:23:50 Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted July 16, 2013 Share Posted July 16, 2013 Posted by John Olsen 1 on 21/10/2012 00:36:07: Is there some reason why a picture of my Saito appears at the top of this thread? At least it does for me. It is certainly not a Wankel! No idea how the picture got there John. But I've removed it now. Cheers Chris Quote Link to comment Share on other sites More sharing options...
001 Posted July 16, 2013 Share Posted July 16, 2013 Peter, I don't think there is a Mk.3. The Mk 2 was improved a few years ago with a venturi extension and an angled needle valve. The Mk. 1 has the cooling shroud, which some people remove. I also had a Mk. 1 , I found it easier to start than the 2 which I could never start by hand. It was smoother as well, probably because it was less powerful. I don't think I would ever run one of these without some castor in the fuel. Smells good as well. Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted July 16, 2013 Share Posted July 16, 2013 The mark 1 had the carb coming out of the crankshaft housing. The mark 2 has it up beside the exhaust port. I am told that the mark 1 was much less powerful. My mark 2 has far more power than my beloved SC 32s. I start mine on a starter and use Formula Irvine 10% fuel. Just as amatter of interest, while testing an Eagletree G meter the model pulled 24.8 G and the engine never eve coughed. Quote Link to comment Share on other sites More sharing options...
Phil Claridge Posted July 17, 2013 Share Posted July 17, 2013 i have a mk 1 fitted in a graupner cessa cardinal, anyone interested in buying it ? Quote Link to comment Share on other sites More sharing options...
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