Ref: http://142.26.194.131/aerodynamics1/Multi/Page2.html
A windmilling prop at low idle will actually produce more drag than a stopped prop. However, with the engine turning at a high idle, it will help carry you a long ways. I nursed a Stinson Voyager 8 miles at night from 1700'AGL with best power variable from 1400 - 1700 RPM as the remains of the engine beat itself to pieces. That's just above a high idle, but significantly lengthened the glide to safely make it to a runway. However, your point is well made that a little bit of power makes a huge difference in glide. -Jeff -- "Orma" <o...@aviation-mechanics.com> wrote: Hello Net I have read the responses on glide ratio and see that no one has made the real test with the engine off. Any number that you get with the engine a idle is an over estimate. How much of an over estimate depends on the thrust the engine and prop combo put out at your particular idle speed. My KR on it's first flight had the Idle too high and would not stop flying and continued to float down a 10,000 foot runway until I cut the engine off. I'm saying this yet, I don't recommend power off testing. Knowing how the aircraft controls at minimum controllable airspeed is probably the most useful information you can have besides knowing and having a feel for how and when your KR will stall. If I feel that my engine is not reliable, I head to the nearest airport. Along the way I continually look for a safe place to land. I have never considered the question "If my engine quit how far could I go?" Better to pick a spot to land then to try and fail to make it that last mile. Orma Southfield, MI N110LR Tweety, old enough to drink this year Flying and more flying, to the gathering or bust http://www.kr-2.aviation-mechanics.com/ _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
