O.S. FS91 SURPASS II-PUMPED
09-20-2004, 07:28 PM
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Location: MT STERLING, KY
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O.S. FS91 SURPASS II-PUMPED
Does anyone have any experience with the "pumped" versions of the O.S. engines? I was wondering if I have to pressurize the fuel tank from the muffler the same way that you would a 2C engine. Any prop size suggestions would also be helpful. The engine is going on a Super Chipmunk with flaps and retracts, and I am looking for pulling power and not really that much speed.
rick
mt sterling ky
rick
mt sterling ky
09-20-2004, 11:08 PM
#2
RE: O.S. FS91 SURPASS II-PUMPED
No, you do not have to pressurize the fuel tank from the muffler. The pump delivers constant fuel flow to the carb without muffler pressure. Note that the muffler does not have a pressure fitting on it. You leave the vent line from the tank open to the atmosphere. Prop sizes: 13.5x8, 14x7, 14x8. Go with a 14x7 if you are looking for pulling power.
