Sender: "Marvin Kaye" <marv@lancaironline.net>
To: lml@lancaironline.net
Date: Thu, 07 Oct 2004 09:56:53 -0400
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From: Michael Smith <msmith@cervicalspinespecialists.com>
Subject: RE: [LML] Re: Gloves for use with MC
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Lancair Network IV drivers:

I have a little fine tuning to do to my IV. It has been a great airplane.
There is one last area that needs attention, now 400TT.

 It has a low level not really all that bad but decided rumble that emanates
from the nose wheel area.  I took the gear doors off and flew with it and
the rumbling is worse.  I don't see any areas of vibration damage, cowl
contact, and so on.  The TSIO 550, 3 blade Hartzell has GAMIs, prop
dynamically balanced, and it frankly runs rather smoothly.  

I feel it in my feet, mostly, and since the rest of the airplane is so
smooth, I sometimes fixate on it.  Sometimes over the Rockies or Lake
Michigan it may be fatiguing.  I take others on the plane and they don't
notice it at all like I do, but it is there.  It tends to diminish <160 KIAS
and > 240 KIAS.

I did enlarge the cowl opening when I built the plane to oblong openings,
with about 25% more area, per F. Morenos sketch.  Cooling has never been a
problem, in fact with the gear doors off, the cooling is even better, but
the plane loses about 3 KIAS.

The nose gear light is hooked up to the door and the doors opens slightly at
>230 KIAS.  I had a gear door bolt (the round headed one) break once over
the Rockies with a loud bang, so I don't over tighten the link to avoid that
happening again.

Does anyone out there have any experience with this issue?  If so, what
solutions are available?

Michael D Smith
msmith@cervicalspinespecialists.com