SonexBuilders.net

I just did a fuel flow test of my Sonex tail dragger in the parked position. If anyone wants to check my math:
- 1 gal came out in 82 seconds
- Flow(GPH) = 3600 X #Gallons/#Seconds
- 3600 x (1/82) = 43.9 gph

At 0.55 lbs per HP, the Aerovee should burn:
- 0.55 lbs x 80 hp = 44 lbs/hour
- 44/6 lbs (avgas) = 7.33 gph (wide open throttle)

FAA says design for 150%, so...
- 7.33 ghp x 150% = 11 gph

So at 43.9 gph I think I have enough fuel flow ;)

Next I need to check with a steep (25 deg) climb angle.

Mike Smith

Sounds good. Check at a steep angle and with only a few gallons in the tank to get worse case.

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I'm not sure how to factor it in, but nose high the bottom of the tank might be able to show higher flow, but it will also have less height above the carburetor which is below but far forward of the tank outflow.

The bottom line is that if you are in a steep nose up attitude you normally need full power. In a steep nose down attitude...not so much.