lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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 Posted: Tue Oct 02, 2012 12:33 pm Post subject: Dead stick compared to engine at idle |
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Yesterday afternoon turned out to be stable enough that I could actually put to the test the idea of which gives you a longer glide, engine on or off. The test was performed at 4000 feet, temp was low 80's, wind was varible, but generally almost nothing. My test consisted of either cutting the engine or power at the same "Rock Jack" at 4400 feet altitude. That gave me about 3000 feet of runway in front of me.
My first test was engine off. I established the 4400 ft altitude and cut the mags at the Rock Jack, established 50 MPH descent. I found that the end of the runway was about where I was going to end up. I did make sure that I put it on the ground before the fence. The glide ratio worked out to be 7.5 to 1
I took it back up again and repeated the same test, only I just throttled back to 2000 RPM's again established 50 MPH descent. When I reached the end of the runway, I was still about 75 feet high. That glide ratio is for all intents and purposes was 8 to 1 .
I then repeated the test at 4200 ft altitude. Engine on produced at least 50 feet further.
Now it is a given that no two Kolbs fly alike, especially different models. The difference in altitude will also play into the equation. However this is what works for me and mine. Yours may vary, but I am happy and vindicated.  .
Larry
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