Ok Robert if you are going to compare figures be sure you know what you are comparing.

The OS .91 fx is lighter than a saito 100 the saito weighs 20.8 oz w/out muffler and a .91 fx is 19.4 oz without muffler. The comparison that horizon hobbies has on there website is between the OS .91 FOUR STROKE and the saito 100 FOUR STROKE. check the numbers I listed earlier and the ones on the horizon site and you will see the the .91 fx will out perform it.

As for the YS vs the 160 lets compare apples to apples, put a pumper on the 160 fx and see what you have. Obviously you have no experience with a 160 fx, it has silky smooth throttle response and great low end. How bout we have a 3d competition with our planes......... thats even if you own a YS DZ. :devious:

As far as the "power loss" analogy goes "PLEASE" all of your colleges already agree that four strokes are for flying SLOW. If 2 strokes are wasting so much power how come no competition quickee plane or for that matter any other type of race plane, or to broaden the scale any other type of competition helicopter or r/c car are using four strokes? If four strokes are so great how come there are no gasser ones offered?

Sure I will agree that 2 strokes are not very fuel efficient but I have never seen any high performance engine that is. Last time I checked the guy with the Dodge Viper didn't car how many miles per gallon he was getting, NEITHER DO I.

Four strokes are a novelty item for flying slow. pirate: