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The Endo

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Rick Caldwell
IAC MemberHomebuilder or Craftsman
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#1 Posted: 10/4/2009 17:36:42

Thought I'd go try the endo that was described in this month's Sport Aerobatics. I get a real nice outside snap roll but no tumble. I'm in my One Design. I know I'm slow on the control inputs as I'm trying to be cautious on trying something new, but not that slow. Also, maybe the stick doesn't go full forward as I was holding the grip instead of lower on the stick. There is a lot of travel in that stick.

What are your experiences?

Rick



Paul Schulten
5
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#2 Posted: 10/20/2009 12:47:43

Howdy Rick! 

 

     I read that article too, I'm getting a decent tumble out of my Christen Eagle.  Honestly though, heck I have a hard time telling what happens in any tumble!  That and no tumble seems to go the same way twice.  My Eagle seems to do about 3/4 of a snap and then pitches over and goes into a spin. So, I guess I'm getting half a tumble?   Just try different entry speeds, and I think you have to be pretty deliberate with your control inputs.......also you can vary the line - 45 up, straight up entries will give you different outcomes.  Lots of fun figuring it out (or trying to!). 



Rick Caldwell
IAC MemberHomebuilder or Craftsman
6
Posts
0
#3 Posted: 10/21/2009 12:48:09

Hello Paul,

Thanks for the input. I was discussing this with a friend who flew an S2A in his time. He didn't understand why I was using left rudder. I told him only because the article said left. He said the right rudder will make the nose pitch down; what I should do is full right rudder immediately followed with full forward stick & left aileron. So I did, on a 45 up line, at about 100 mph indicated.

I got something different than the neat outside snap from the article's inputs. I got larger rotations with the a/c fully yawed so it seemed to rotate about an axis yawed off from the centerline of the a/c. It was fun to fly. Tumbling is new to me as I am a Sportsman pilot who has been trying to advance up to Intermediate during practice this summer. I expected to see a more pronounced end over end type of maneuver. It's only been that one flight so far; work has kept me from flying last weekend. I can't wait to go try again.



Paul Schulten
5
Posts
0
#4 Posted: 10/28/2009 21:31:38

Hey Rick!

 

     The best results I have gotten are a little variation on what your doing.  Start with a 45 upline inverted, slow to about 90-100, then full right rudder, forward and left stick.  Depending on CG, technique, etc., it usually does about half an outside snap, then tumbles.  Not sure what its doing, but you get some funny wind noises and sensations, nothing unpleasant.  I usually chop the power when its done tumbling, and let it fall into an inverted spin, then recover.  Or, you can do a 45 upline, roll knife edge, then try the whole thing.  Fun fun fun.  Let me know how it goes !