ORIGINAL: cmoulder
Matt, thanks so much again for your patient explanations, and for filling me in on your subsequent ''upgrades''. I love to tinker with stuff and am always looking for ways to make things simpler, which almost always means better as well.
OK, I think I now have a complete understanding of the design, materials and process.
The only wrinkle with the Syssa - as you know from doing your and Ed's mounts - is that the engine uses 3 stand-offs and one of them, the ''top'' one in the inverted mounting standard, is not the same distance from the crankshaft center. By my measurement that odd one is 31.5mm and the other are 42mm.
So I am just going to make a little ''ear'' extending inward on the engine-side ply plate so that the crankshaft and soft mount centers are in alignment, and maybe beef it up a little at that spot on the ring. No biggie.
More later when I get underway... probably a couple of days.
Bob,
That's exactly what I did on the new mounts. The stand offs are on the circumference of a 4" circle...however that circle and the mount ply ring circle are not concentric. The maple blocks behind the ply ring provide plenty of support. The blocks are approximately 1/4" thick and extend to the surface of the balsa spacer. I make the blocks and just slice down the balsa spacer using the block as guide with the Xacto knife to make a snug fit. I used maple but other hard woods will work fine. The maple is ca'd in
Oh BTW, on Ed's and my second mount that I have in the new plane (first one is in the test bed), I shaved the top of the mount as Merle Hyde does with his, to make it even with the top of the firewall. It shaves some weight too Let me take a snap and post it
Matt