Please note:
Modifications of the airscrew are strictly prohibited. Never stand in the hazard zone in front or beside of the airscrew dure to risk of injury. Never touch a rotating airscrew, injury hazard. Never re-use a damaged airscrew. Never exceed the stated maximum permissible rotationg speed (see chart).

Recommended maximum rotation speed (rpm): Ø - rpm max
5" - 30500 | 10" - 16000 | 15"-10500 | 20" - 7600 | 25" - 6200
6" - 26500 | 11" - 14200 | 16" - 9700 | 21" - 7300
7" - 22000 | 12" - 13200 | 17" - 9200 | 22" - 7100
8" - 20000 | 13" - 12000 | 18" - 8500 | 23" - 6700
9" - 17200 | 14" - 11000 | 19" - 8200 | 24" - 6500