by kevinh » Fri Sep 22, 2017 9:38 pm
Ok - I printed a mount based on Mikes design and I have some extra info and questions:
( Left is a test print in a rigid plastic (just to test the dimensions against an actual engine mount - it fits perfect). Middle is the real part printed in 95A hardness TPU, right is the sonex part )
I tweaked Mike's measurements to exactly match the height of my Sonex bushings the only difference was that the thickest portion of the bushing was a little thicker on the ones I received from Sonex. So as Mike says there may be some variably in the molding process.
Questions:
- The 95A part I just printed feels very hard. Folks who have flown with firmer bushings: how hard were yours?
- I have a friend with a durometer. I'm going to go over next week and measure the sonex part, the part I just printed and the bushings Bryan is using to see how hard each one is ;-)
- Folks who have had drooping problems, do you think it is only really the aft bottom bushings that are softening up? I'm thinking about just replacing those and leaving the others stock.
- My plane is still a few months from flying, anyone who has a flying plane and wants to try a couple of these printed bushings send me a note and I'll send you a pair (if you promise to report back on this thread ;-)). Of course, no guarantees - I'm just some dummy on the internet.
- I can gets some 85A TPU to print with if the 95A is too hard. Or I guess I could go the print and fill a mold route but that would be a bit more work.
Last edited by
kevinh on Fri Sep 22, 2017 9:47 pm, edited 1 time in total.
Taildragger Waiex in progress, tail done, wings done, about to mate wings to fuse,
then cowl, canopy, paint (
photos): flush rivets, turbo aerovee, acro ailerons
(I built my RV7A and happily flew it for about 500 hrs)