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Old 01-03-2010 | 06:18 PM
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ARUP
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Default RE: Balsa USA 1/4 E.III Eindeker


ORIGINAL: Jack H

Well yes it would br messing with the original '' kit design ''

A. using 1/4'' square balsa stock for the empanage structural behind the fuse is asking for a disaster for lack of integrity and strength for a .90 to 120 size with over 1000 square's.

B. the ''Kit'' air foil is a FAT Clark Y flat bottom airfoil with a very thick amplified root section, '' slow -inefficient - tons of parasitic drag - no better than a line draw around my shoe sole.
in this case the thinner section will add both a bit of speed and increase efficiency for the limited HP available. Mr. F was no dummy.

C. full Flying pivoting stab, along with a full flying pivoting rudder put's 100% of the total surface area available fort both pitch and yaw = making both extremely efficient and sensitive.
may even get some ''Real'' dog fighting capabilities against those S pad's

D. shifting the motor back to conceal it deeper in cowl '' scale'' will bring the C.G. forward, providing further mechanical advantage of the full flying stab in pitch.


Yes it will change the kit -
Just some more ideas:
A. Use 1/4 spruce for the longerons (or, maybe, dowels like the Proctor kit).
B. Agreed- thin the ribs and build warpable wing.
C. Use exponential throws on your radio. Just slip some brass tubing over some wire and build stab and fin onto the wires.
D. Shortening the nose may cause c.g. issues and one option is to build battery box to mount on engine side of firewall.
The Eindekker was a crappy airplane but it sure is neat... and historically significant!