East Coast Scale
Key Veteran
Location: Taxachussetts
| In the 520 you use the Webra 75 and in the 900, Vario in Germany recommends the Webra 70. With that said, when you couple the torque produced by 5 blades, and the fact that the motor probably loses 25% of its power turning the big fan on the bottom of the motor to power the tail, you quickly run out of tail authority flying either in this situtation if the motor is not set exactly right. That is until now that i have been retrofitting the Webra 91 into both versions, and there is not problem with the 5 blade head as this motor has enough power to handle the load. My 520 now flys around with the flybarred head with plenty of authority, and when flying season rolls around next spring i will probably have the 5 blader back on.
Joe |
