You’ve probably seen shaft boots though. They are eliminated from racing vehicles to reduce the weight (especially important when it comes to rotating mass), and the increased wear is less important than faster lap times.Interesting. I've never seen heat shrink tubing on outdrives/couplers like that...
Are you trying to cut out some "chatter" from the driveline?
For me, the reduced noise and wear are more important. I limit the power from the transmitter already since I’m not that great of a driver, I’m actually faster with a car that’s slower. I have a history with belt wheelers (YZ-10 and RS4 Mini) and the metallic sound of shaft-driven vehicles puts me off.
I’m experimenting with various ways to reduce the noise and wear of dogbone type couplings. Even without the protection of a full boot, I think wear can be reduced by eliminating the chatter with a small length of heat-shrink tubing. The plastic blades on some designs are ingenious in my opinion.
So far, the tests are positive. The truck is so much quieter that other drivers at the track notice it.