Originally Posted by
MasterTech
For a direct connection that can withstand some slight misalignment, what about speedometer cable or power seat cable with aluminum collars with set screws at both ends for attaching to the motor and cable? Speedometer cable may be harder to come by than the power seat part since it's been quite a while actually seeing one of those on a car.
That would certainly take care of misalignment, but I fear that the time data would be severely skewed due to twisting of the cable. 1us of time doesn't equate to much angle at these speeds; it's about 0.05 degrees at 8000 RPM. I'm guessing that the cable would probably twist at least an order of magnitude more than that.
I was thinking something similar to a third-bearing clutch support on a kart, with a solid connection between motor and flywheel, but with restriction on radial movement and wobble.
But first we will need to see the if the data from many runs with the gear reduction shows undue scatter, or if all of my worries are unfounded!