Transmisssion Ratings for Helicopter Gearboxes
Transmisssion Ratings for Helicopter Gearboxes
(OP)
How are helicopter gearboxes (i.e., main transmissions, tailrotor gearboxes, etc.) typically rated (i.e. Horsepower, Torque, etc.)? Please explain. I know they can vary, however, what is a typical rating for systems currently fielded.





RE: Transmisssion Ratings for Helicopter Gearboxes
RE: Transmisssion Ratings for Helicopter Gearboxes
Maybe this link will help you
http://www.tpub.com/air/10.htm
Regards
Fernando
RE: Transmisssion Ratings for Helicopter Gearboxes
There are numerous ways to qualify this rating as well, and that's a whole other story!
RE: Transmisssion Ratings for Helicopter Gearboxes
I have estimated that the main transmission is up to 90% efficient, based on my rough calculations of hover performance, but don't quote me on that. Maybe stick with 80% to be on the safe side.
You might get a few more answers if you post the question on the rotorcraft forum, too.
STF
RE: Transmisssion Ratings for Helicopter Gearboxes
HP and RPM (engine(s) intake and main rotor shaft)or main rotor RPM and de-multiplying factor.
a medium tonnage ussualy has a 4000 HP with main around 300 rpm and two engine couplings rated between 20,000 to 50,000 rpm (just for example)