Lesher got some help from Molt Taylor on the drive train. I think Teal might also use the mechanical soft start device that the Mini-Imps use. Hard to find and expensive. You might be able to see it up close at the EAA museum if you ask nicely, for measurements and such. The two place Lesher pusher design is on display at the University of Michigan in the Engineering building lobby.You might research the Lesher Teal.
I got a tour of the Wright brothers museum a few years ago. They have a fully functional, practical, but not-meant-to-be-a-true-replica of the Wright B Flyer that uses one of these shot-filled Flexidyne couplers in the drivetrain.
And I know they can be pricey if you can find them. Have builders in the Mini-IMP community had any experience/results in fabricating their own Flexidyne-type couplers? The concept is simple enough (but, so is an Otto-cycle engine, and few folks successfully make their own).I can tell you that finding a Flexidyne 9C is something that all us Mini-Imp builders really seem to have trouble with.
Except that the propeller is a flywheel at the other end of that shaft. If the engine's power pulses aren't taken out before the power is sent down the shaft, something's gonna flex and get hot and fail. In a car, the clutch plate has springs that do that, or in an automatic the torque converter does it. Billski can elaborate on this.Where you start is studying cars. Except for electric. They all have drive shafts. Front drive , rear drive, all wheel drive. You are going to do the same thing output from engine to input to propeller. No different from output from transmission to input to drive wheel.
Yeah, that's the rub. I'm unaware of anyone trying to fabricate there own. Back in the day, some early builders bought more than one, so now when people get to the point they need one, there's a secondary market that's more reasonable. There are some builders who age out or lose interest (it's not a super intuitive plan set), so if they bought a coupler, they have no use for it, so up for bid it goes. I'm so far from needing the flexidyne, I suspect there might be some floating around when I'll need it, or another solution might be more viable.And I know they can be pricey if you can find them. Have builders in the Mini-IMP community had any experience/results in fabricating their own Flexidyne-type couplers? The concept is simple enough (but, so is an Otto-cycle engine, and few folks successfully make their own).
The idea of a DIY coupler seems attractive. Conversely, the idea of a few pounds of hot steel shot being flung out of a ruptured 3000rpm housing seems unattractive.