|
|
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
|
|