was looking at the RCV add and had an idea ( copyright Phil 2003 )
if the piston is happy with the cylinder spinning around it, is it possible to lay the piston flat behind the crankshaft, and the crankshaft turn into a cylinder. the whole engine would be laying flat meaning its totally aerodynamic, perfect for speed planes.
as i was typing this i wondered how you would connect the piston to the cylinder to make it turn, but RCV worked it out and they have bevel gears. remove the bevels and it's laying flat.

just wondered if this possible with two strokes. or if i'm just stupid

Go to E-bay and type in : "inline engine" under the hobbies r/c section and you will see for sale a Kramarenko .60 which won the world championships in 1974. It has the configuration you are talking about. I'd love to have one but can't afford it. A copy of this engine was made by Hiness (a Japanese company)which was far more attractive and sells for an even higher premium if you can find one.

Max


Here's a poor picture of the Hiness

ollocks.
ah well, at least it's possible, but in the quest for speed or looks, i wonder why more arn't made. maybe it's complexity/weight over simplicity and cost

The reason you don't see more of these engines, especially in speed applications, is that you lose a fair amount of power through the gear system. A standard configured engine can easily be cowled to produce very little drag without worrying about adequate cooling. The last time I read an article where one of these engines was present, the writer noted that the flyer had continous cooling problems. These inline type engines are also expensive and more complicated to produce. Too many negatives offset the positives.

But, they sure are neat!

John

Hope it runs better than the RCV 120 I bought, Destroyed the pinion gear before the motor was broke in--$120 later got motor back ran three tanks through it same thing--could have bought a ys 140 dz for what I have in it--gave it to a friend--he loves to laugh at my misfortune and keeps it to remind me stay away from new designs!!!!!!!!!!! If it ain't OS YS or MOKI pass it by!!!!

rflasch, RCV has a very good warranty program and are very good about honoring it, you did not have to pay $120.00