Bryan Cotton wrote:Check out this thread:
http://www.sonexbuilders.net/viewtopic. ... olt#p50248
DCASonex wrote:Still have the tools, but they are so simple you could make your own much cheaper and faster than post to Oz.
David A.
GraemeSmith wrote:OPINION follows.
On a different aircraft - I found the adjustable receptacles to be fiddly to setup, hard to keep setup and subject to wear and failure dues to vibration inherent in 4 banger engines with 2 bladed props. At 450 hours they were junk and I went back to fixed receptacles.
Cheaper and easier to keep setup up - fixed receptables and then a small collection of different length fasteners till I found the setup that worked. Then retaining rings to keep the correct length fasteners in the correct holes. Also as previously mentioned - the fasteners need to sit in washers to protect the fiberglass from wear.
I'm not sure what spacing formula might exist. My Legacy Sonex has a total of 6 spaced across the top back edge of the cowl halves. Three per side. A good soft layer of vibration tape under the cowl and on the flange to stop fretting and give a little "spring" when fastening down.
You might also just walk around the tie downs with a tape measure and see what others have. I'm guesstimating from memory that Cessna uses 4" centers
GraemeSmith wrote:Measured in the tie downs yesterday:
Cessna 150 - Horizontal seam 6" centers. Curved seam to hold to firewall - 10" centers
Cessna 172 - Horizontal seam 5" centers. Curved seam to hold to firewall - 8" centers
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