Like the title says.

its been a couple of years at least

The .46 AX came out in 2003. You may find this time line interesting:

http://www.osengines.com/history/ostimeline22.html

Bruce

The 46FX came out in 1995

that Rotary 49 PI Type II (2007) looks cool. If I had the money, I'd get it. I have no idea what I would put it in

The 46FX has a lot more power

from what i hear, that same engine has been around for a lonnnng time with very few mods done throught the years. to bad they dont make it cheaper/more efficent (its a 30 sized engine that makes the power of a 40 but drinks fuel like a 60).

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Can't be done. The rotary engine will always require more fuel to produce its power, and the engine requires precision machining...you can't just cast parts and be done with it. The machining is more complex than reciprocating engines need, so it costs more to make. It's as much a novelty engine as anything, but it's really quite a nice engine, and suits a lot of different types of installations. That's why O.S. has had a Wankel engine since the 1970's ( http://www.osengines.com/history/ostimeline05.html ).

Than the 46AX ?????? [sm=confused.gif]

Than the rotary 49

thanks for clearing that up, i was beginning to think back many years ago when i had a 46FX

o well, why not make a 40 sized wankel so it would be more useable?
have you guys ever thought of making a small wankel gasoline engine? maybe to compete w/ the new satio gas engine. no one would care if it drank more fuel because it would weigh less and produce more power. you could prob make a wankel for the same price (or less) of one of those saito gassers.
just thought i would ask, i think rotary engines are cool, i would love for them to be more pratical

Just a little history on the Wankel engine. NSU (the German car company) bought the rights to build the Wankel and sold on the rights to Graupner allowing them to make model sized Wankels. Graupner in turn contracted OS to actually make them so they were usually boxed as a Graupner-OS.

But because they have such complicated (read odd shaped) machining, OS had to invest in buying specialised CNC machines. So the Wankels were the first CNC made model engines. A couple of years later OS brought out their new line of 2 strokes and naturally used their CNC machines to make them. The first CNC made 2 stroke was the 40SR which was a rear induction pylon engine. This engine (well, the crankcase anyway ) later morphed into the more familiar 40FSR for sport flying and presumably the "F" stands for Front induction. That's why the FSR engines only have SR cast under the exhaust port because it's the same casting as the original SR pylon engine.

Wow, Downunder, where DO you get all of this info?

Always interesting.

Yeah, id like to know too

A bit here, a bit there, slowly put it all together over many years . TOTAL accuracy of course can't be guaranteed but I do my best.