Hi Skogsgurra.
Good point, I didnt read the OP with enough detail, however I think my point may still stand, I have never managed to find a data logger that is small enough not to affect the rotor dynamics on a small shaft & has a high enough sample rate to be really useful.
Sorry to hijack...
HI 1Gibson,
I'm new to the forum so sorry if this has already been said or is teaching you to suck eggs, but you may have issue with the logger on the shaft depending on the RPM i.e. G Load you you be subjecting it to?
It may be an option to look at a telemetry system or a slipring to bring...