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
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
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
The VRDF is a ducted fan engine, as has been suggested. If you're going to run a prop on it, use one small - AND strong - enough to let it run at around 18,000rpm on the ground. It is intended to turn a fan at around 22,000rpm on a tuned pipe. See your friendly local pylon racer for a prop! And don't scrimp on the oil either. 18-22%, with some castor recommended.
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