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Date:  4-21-2014
Number of Hours:  0.50
Manual Reference:  
Brief Description:  High angle fuel flow test

I did a first fuel flow test tonight. I disconnected the fuel hose from the carburetor and placed it in a bucket (photo 2). I had the bucket marked at 1 gallon. THIS test was done with 3 gallons in the tank, and so left it with 2 gallons. This is a good test of a high angle with low head pressure.

As I did on April 7, I did another fuel flow test, but this time at a climb angle. I had hoped to get to 25 degrees, but we were only able to get to 21 degrees (the angle of the hill + raising the front wheels).

I opened the fuel valve by pushing in the rod I have connected to the valve and timed how long it took to fill the bucket to 1 gallon.

It took 88 seconds (it was 82 seconds for the level test, so pretty close). If anyone wants to check my math:

- 1 gal came out in 88 seconds
- Flow(GPH) = 3600 X #Gallons/#Seconds
- 3600 x (1/88) = 40.9 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 40.9 gph I think I have enough fuel flow ;)
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The hill is steeper than it looks. About 10 degrees.

The hill is steeper than it looks. About 10 degrees.

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By adding more material under the wheels/ramps, we got 21 degrees.

By adding more material under the wheels/ramps, we got 21 degrees.

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Fuel hose disconnected, and 1 gallon in the bucket.

Fuel hose disconnected, and 1 gallon in the bucket.

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