"Ron Wanttaja" wrote in message
...
We've got some Fly Baby builders who are considering building the Hevle
Classic tandem Fly Baby. We're trying to work out what would be a good
thickness for the spruce spar. My thought was that comparing it to that
of
a production plane would be a good start.

So, can anyone tell me the thickness, height, and length of the wooden
spars for the J-3 and the Aeronca Champ?

Ron Wanttaja
www.BowersFlyBaby.com



Ron, the wood spar dimensions for the BC12D model Taylorcraft are as
follows:

The front spruce spar measures ¾ inch thick by 5-11/16 inches tall

The rear spruce spar is 5/8 inch thick and 4-3/8 inches tall.

So far, no AD's on the Taylorcraft's spars, knock on wood.

For wood specifications Grain, knots and moisture content refer to following
FAA website

To look in the Advisory Circular 43.13 found at:

http://www.airweb.faa.gov/Regulatory...visoryCircular
..nsf/0/CCFE0D58D41D2C8086256A55006C6B67?OpenDocument&High light=wood