RE: Put OS50 to Rappy 30
No-but with the small blades you'll have to be real carefull of your head speed...you might want to add a gov., the throttle jockey is only $70.
As said before... the blade grips for a 30 ARE NOT STRONG ENOUGH for the 50...not only may it throw a blade...you will get inverted boom strikes (done this allready with a 30).
After the crash...just add the longer boom, belt and blades...then you'll have something.