MLG tires hitting upper wing skin

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From: Gary Edwards <gary21sn [at] hotmail.com>
Sender: <marv [at] lancaironline.net>
Subject: Re: MLG tires hitting upper wing skin
Date: Mon, 09 Jun 2014 07:37:37 -0400
To: <lml [at] lancaironline.net>
I've never had that issue.  I definitely don't run that much air
pressire in the tires, but I wouldn't think high air pressure would make them
wider anyway.
 
The mains just touch the upper skin but close fully, which is what I
like.  It gives them something to be up against rather than hanging there
loose. 
 
Clearance the upper inner skin/foam to clear the tire, and add 3 bid
covering.  It probably won't be a very big area to get clearanced. 
Where mine touches is only a few square inches of area.
 
Gary E
235/320
Medford, Oregon
   
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Sent:
Saturday, June 7, 2014 8:15 AM
Subject:
[LML] [LNC2] MLG tires hitting upper wing skin

After replacing the original Rosenhan brake calipers that came
with my
L-235 with new Matco B5-4 units, the tire now contacts the
underside of
the upper wing skin just before the gear is fully retracted.
As you all
know, the brake mounting plates fit between the aluminum gear
casting
and the axle. The old Rosenhan die-cast brake plates were .210
thick.
The new Matco brake plates are only .125 thick, so I had to add
shims
between the casting and axle to keep the brake disc properly
"centered"
between the brake pads. On my latest installation, the distance
between
the gear casting and the axle is now .310, which extends the wheel
and
tire out  .100 more than before. The gear door is probably only
.060
away from closing when the tire hits the underside of the upper wing

skin, so the addition of the shims seems to have caused the
problem.

I originally had 70 PSI in my Cheng Shen MLG tires and bled
them down to
60 PSI but that didn't help.

Today I will attempt to
reduce the thickness of the shims, but I fear
that's not going to work
because the new Matco brake pads are thicker
than the old Rosenhan pads
and need more clearance to allow for wear.

So the only options I can
think of at this point would be to 1. carve
out a crescent of the upper
wing skin core where the tire it hitting, 2.
grind down the ridge on the
tire where the tread meets the sidewall, 3.
Reform the middle gear door,
or 4. fly with the aft edge of the middle
gear door about 1/16" away from
being flush.

Has anyone run into this problem? Any
suggestions?


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