Mark
Interesting to read about your wing extensions. I am wondering what
you are doing about the extra bending moment and shear they will create.
If my calculations are correct (assuming no increase in your AUW, 1200lbs)
Your Bending moment will go from 68,000 inch pounds to 93,500 inch pounds.
And the shear will go from 1858lbs to 2180lbs. From your e-mail below it
also sounds like you're increasing the AUW. If so then these figures will
increase even further.
Eg if you increase the AUW to 1300lbs (an extra)100lbs the BM goes to 101350
inch pounds and shear to 2362lbs
You must be careful with wing extensions as they increase the bending moment
at the wing root significantly. Also consider the extra load it will put on
the wing attachment fittings.
I'm curious to know if you plan on beefing up the spar or wing attach
fittings.
Regards
Peter Leonard
Brisbane, Australia
-----Original Message-----
From: krnet-bounces+pamks=bigpond.net...@mylist.net
[mailto:krnet-bounces+pamks=bigpond.net...@mylist.net] On Behalf Of Mark
Langford
Sent: Wednesday, 30 June 2010 1:33 PM
To: KRnet
Subject: Re: KR> Dihedral
OK, I dug out the plans, and the outboard spar is 78" long rather than 79"
(what was I thinking....), so it's actually 3.7 degrees rather than 3.8.
I killed another day of vacation working the stub to outboard wing gaps
again. One thing I've learned in the last three weeks is that it feels like
it takes a lot longer to get something done when you know there's a
perfectly flyable airplane there and you're missing some killer
sunsets.....if only the wings were attached to the thing! The big stuff is
done, adding 13.5" of wing tip for an increase of 8% wing area, flap
geometry improved from 23 degrees to 40 degrees, Hoerner tips, and many
other little details addressed. Hopefully a new 7.5 gallon aux wing tank
will commence construction tomorrow, but if it gets as long and drawn out as
the wingtips did, it may have to wait another 900 hours to get completely
finished. Today I relearned how valuable a heat gun is when it comes to
altering fiberglass parts in a hurry.
See http://home.hiwaay.net/~langford/900hour/100629083m.jpg for the current
state of affairs regarding the wings. More on all that later...
Mark Langford
N56ML "at" hiwaay.net
website at http://www.N56ML.com
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