rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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 Posted: Fri Oct 21, 2011 11:38 am Post subject: Progress on the Mk IIIX |
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The latest changes have been made to Ken Holle's Mk IIIX and flown with mixed results.The changes were covering the engine mount frame and lowering the engine to the stock height (nearly, anyway, I have 1/2" spacers on the aft mounts).
To accommodate the latter change a new engine mount plate had to be made to move the engine back 3/4" so that the "E" gearbox electric starter clears the rear spar carry through. I've attached .pdf and .dwg files of the new plate. I also had to provide some clearance for the engine mount tube on the pull starter flange of the engine. I channeled Paulie on "American Chopper" and sanded a divot in the flange with my right angle dotco.
Covering the engine mount frame produced the most interesting results. The climb rate literally doubled even though I swapped my 66" diameter WD prop for Ken's 70" diameter WD prop. I also had to add almost 3 degrees of pitch to the prop.
Unfortunately, the lawn dart syndrome persists and the wing still breaks hard left when doing an approach stall.
Today I have the nose cone off to install some stiffening ribs to eliminate the deformation I see in flight (the nose cone has taken a set so that it is caved in even sitting on the ground).
Tomorrow, after I reinstall the nose cone my neighbor is going to fly formation with me and video the left wing tip to see if the repair done by the OB is distorting at high angle of attack. I have no other clue as to why the aircraft breaks left in a stall and requires aggressive recovery technique to break the stall (most unKolb like).
Rick Girard
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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