Mailing List lml@lancaironline.net Message #45232
From: Gary Edwards <gary21sn@hotmail.com>
Sender: <marv@lancaironline.net>
Subject: Re: limit Gs for 235 (kit #11)
Date: Thu, 06 Dec 2007 14:40:30 -0500
To: <lml@lancaironline.net>
Terrance,
 
I do not know the details of the kit you have.  But, it seems to me that if you have 235 kit #11 which was probably originally purchased in late 1985 or early 1986, and it was built, then you have the 235 spars.  The 320 airframe did not come out until 1988.
 
I also know that Lancair reduced the main spar strength requirement of the builder installed main spar center box closeout construction subsequent to the early kit numbers.  So, if you have kit #11, it is likely you may have a stronger main spar than subsequent 235's.
 
When Lancair built #001, the completed wings each weighed 36 pounds (verifiable).  The bare wing spar weighed 9.25#, the finished wing spar weighed 11.25#, the bare wing skin weighed 10.25#.  So, finished wing spar and bare wing skin total 21.5#.  I do not believe there is 28.5# of ribs, layups, tank sealer, idler arm hardware, fuel tank control arm tube, and other, added, to arrive at your estimated 50# wing weight.
 
Gary Edwards
LNC2
Medford, Oregon 
----- Original Message -----
Sent: Tuesday, December 04, 2007 3:24 PM
Subject: [LML] Re: limit Gs for 235 (kit #11)

Gary,
Many thanks for great info. I don't have any of those newsletters.
Assuming the tested gross (tested the left half of the wing from (fusl) centerline outward) then was 1400 lbs/2, less (est. wt. of the wing itself (50-lbs too high?), loaded to 9000 lbs (ult., failure), that works out to 9000/650 = 13.8Gs. Also, the newsletter says 4.4Gs x 1.82 (that equals 8Gs)  So at 9000 lbs/8 = a gross of 1125 lbs?
Also, the newsletter says they increased the size of the main spar inserts (the sparcaps?) before releasing any kits.  So, how can one tell what one has/
What am I missing?
 
Terrence O'Neill
LNC235/320
Carlyle, Illinois
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