666yeti666
06-04-2008, 09:58 AM
Hi there,
I want to put a warning over here for members that are flying a logo 10 (3D) XL which use 550mm blades.
Recently I've had a stripped maingear during flight which caused a crash.
After investigation it turned out that bending of the plastic MOTORPLATE was the cause of this failure. When this happens the distance of the piniongear and the maingear will become larger and while the electric motor has such a large torque it will put more stress on a smaller surface of the teeth of both gear, which will cause the strip.
I'm using governor so the motorspeed remains constant. I can imagine the situation becomes even worse when flying with a non-linear throttle curve. So high pitch = increase motorspeed = more stress on gears.
Furthermore , during warm weather and a high motortemperatures this phenomenon starts sooner. The plastic motorplate becomes softer then and bending is easier...
The bending is caused by the larger forces on the mainshaft because of the larger 550mm blades.
I think this isn't a problem with the standard adviced 500mm blades.
The solution to this problem is using the optional available aluminium motorplate. This does not bend and temperature of the motor does also decrease, because of the better heatflow from the motor to the aluminium to the air.
good luck
regards
sebastien
I want to put a warning over here for members that are flying a logo 10 (3D) XL which use 550mm blades.
Recently I've had a stripped maingear during flight which caused a crash.
After investigation it turned out that bending of the plastic MOTORPLATE was the cause of this failure. When this happens the distance of the piniongear and the maingear will become larger and while the electric motor has such a large torque it will put more stress on a smaller surface of the teeth of both gear, which will cause the strip.
I'm using governor so the motorspeed remains constant. I can imagine the situation becomes even worse when flying with a non-linear throttle curve. So high pitch = increase motorspeed = more stress on gears.
Furthermore , during warm weather and a high motortemperatures this phenomenon starts sooner. The plastic motorplate becomes softer then and bending is easier...
The bending is caused by the larger forces on the mainshaft because of the larger 550mm blades.
I think this isn't a problem with the standard adviced 500mm blades.
The solution to this problem is using the optional available aluminium motorplate. This does not bend and temperature of the motor does also decrease, because of the better heatflow from the motor to the aluminium to the air.
good luck
regards
sebastien