Tacho'ed a friends Cyclon 09 glow today, 24300 on an F2D combat prop, 10% nitro on suction.
It flew OK in stunts on this venturi, could probably go bigger for level flight, definitely would be faster on a bladder !
how would a bladder be faster? Are the venturi's removable?
yes, thats right.
The venturi is a push fit in the crankcase, locked in position by the spraybar.
When running a bladder you can use a much bigger venturi, more air/more fuel/more power !
Up to a point, anyway