I once saw a club member use a techometer while the engine was running. I know nothing about this instrument. But I get the idea that it has everything to do with the amount of RPM's turning. Now if that is correct, then there must be an acceptable/unacceptable amount in which you should have before actually launching your plane.
My question is: How do you know for which engines what is the amount of RPMs that is within the acceptable range? So many different engines and sizes. I read the info on three of them that Tower Hobbies has on the internet, but I saw nothing that told the amount of RPM's required for each size engine.
Anyone out there in RC land that can clear this up for me?
Thank you