does anyone have information on this engine.
I know it has only just come out (see OS website) and I want to know if it would be suitable for aerobatics (in a Capiche 50). Also any other info would be welcome.[&:]

There are a number of threads on this, you can do a search to find them.

I would say that it would be suitable for the Capiche, but in terms of price, weight and performance the YS 63 is still first choice, and the Saito 72 second.

This engine is like ys-63 ,Short stroke,Working in higher speed,
Lighter weight,But it's so expensive,
The price is higher then Ys-63
OS 70FS Ultimate NT$7500
YS-63 NT$6900
I never saw any one use it untill today.

Sprink - all the magazine tests here indicated the 70 Surpass MKII or even the original had 300-500 more RPM on most props than the Saito 72 HOWEVER the 72 was lighter and responded better to higher levels of Nitro.

Sprink - all the magazine tests here indicated the 70 Surpass MKII or even the original had 300-500 more RPM on most props than the Saito 72 HOWEVER the 72 was lighter and responded better to higher levels of Nitro.

FYI - Ishii Mokei (in Japan) sells the 70 Ultimate for $250.

Hngzy,

The YS.63FZ, like all YS four-stroke engines, is supercharged.
This is why it has a power advantage over all other four-stroke engines (and even some two-strokes).

As most engine manufacturers have noticed, a long stroke engine does not have an advantage in low RPM torque over a short stroke engine. It is all in the porting and in the valve timing.