Model Forum / Radio Controlled / Air Models / July 2004

I have an OS 46 VF which has a front carburator and rear exhaust. I
also have an OS 46 VR DF which has a rear carburator and rear exhaust.
They both have the same case as it is marked with a V. The only
difference I see is where the carburator is mounted. My question is;
Given the same size prop will they perform the same? I am trying to
decide which one would be the best on the plane called the Vertigo
which is a VTOL plane. The engine will not use a tuned pipe.

Dan

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You might want to check the exhaust timing,i think the VR DF has higher timing
meaning the export is higher,so it will turn higher RPM's.  

If I remember correctly, the DF is a ducted fan engine, and the VF is a pylon
racing engine.
Dr.1 Driver
"There's a Hun in the sun!"

Dan, they need to be propped differently. I can't be more specific
since I use them on free flights with non-pipe porting. I think these
are the OS version designations-

        INTAKE / EXHAUST
VR- REAR / REAR
RSR- REAR/SIDE
SR- FRONT/SIDE
FSR- FRONT/SIDE
VF- FRONT/REAR