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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 |
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![]() "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 |
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On Mon, 22 Mar 2004 08:02:25 -0500, " jls" wrote:
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. Thanks much, this helps. The single-seat Fly Baby spars are almost exactly the same, except the aft spar is 3/4" like the front. No one is sure how much margin is in the spar itself, though an entire wing was static-tested to 6Gs in Finland. The gross for the two-seat Fly Baby is about 500 lbs higher; the need to upgrade the bracing wires was obvious, but the issue about the spar thickness wasn't. Thanks again.... Ron Wanttaja |
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