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Short field take off : was 6" extension

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LarryM

Joined: 27 Nov 2007
Posts: 63
Location: Genoa, IL

Posted: Sat Apr 05, 2008 5:17 am Post subject: Short field take off : was 6" extension

With regards to tail up or 3 point take offs:  In theory, a tail up roll would lessen the amount of induced drag created by the wings as the angle of attack would be less, thereby accelerate quicker.  Depending on the take off roll length, it may be noticeable.  With my Avid, taking off at about 850# CG at 17ish", the take off roll is very brief.  I've marked my strip at 100, 200, 250 and 300' markers.  This morning I had opportunity to do a dozen take offs.  I did tail up and 3 points to compare.  I find that the 3 point will very consistently allow take off in the 125-150' range.  The tail up will not reduce that distance, but most of the time, extends it.  There is a lot of room for pilot "non optimize" with getting the tail up, then rotating to take off attitude.  I find the shortest of all take off rolls is when I set the flaps, trim full nose up, hold it with the brakes (as much as possible), then release the brakes and my hand from the stick.  The airplane will jump into the air.  I can shorten it just a bit by "helping" it with aft stick when the airplane feels light.  She will leap into the air, and accelerate through ground effect, but I do NOT recommend letting it, lowering the nose in ground effect and accelerating is the far safer way.  An engine failure at the time of nose high/no speed - needless to say with be prejudice to longetivity of life, limb and airplane.   My "help" can also lengthen the roll, if not applied at right moment.  

  I've been a bit fanatical over the past couple years, trying to get as short as possible ground run.  Early on I found that "something must be wrong with the airplane" because I could not get the tail up as "normal" airplanes do. 

  Thanks for the great discussion and opportunity to share experiences.



larry

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Sun Apr 06, 2008 1:36 am Post subject: Re: Short field take off : was 6" extension

Larry,  Snaps just put together a  740 cc for his Avid, should be interesting this summer . Paul has one of his short take off on voutube.  Totally amazing.

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