Rico
Member
hi there, I have some problems with my main shaft is bending in like 45 degrees after 5 to 7 flights on 3s 11,1 V 2200mha lipo bat's.
I looked online and read this :
The biggest culprit is the main rotor that is a clone of the T-Rex 450 SE, with a thin (3mm) feathering shaft. Given enough RPM, the blades will shake violently due to a physical effect called "aero elastic flutter", which is possible when the dampening is not enough. This becomes more likely as the rubber dampers get worn out.
Doing some math, the Storm comes with a 3800KV motor and a 13T pinion. For a 150T main gear, the rotor may reach way beyond 3400 RPM, but the old rotor design is limited to about 3100 RPM.
Another component associated with this failure is the cyclic bottom plate (http://www.helipal.com/stgc-040-metal-main-bearing-support-bottom.html). If this part gets cracked, warped or simply loose, lots of vibes will occur.
I've witnessed these vibes a lot of times, bending shafts included, so I call them the "Storm Vibes of Death".
Why the Storm 450 is supplied with such a combination of motor, pinion and rotor is beyond me.
Is that really possible, or not.
and how do I calculate on how big my fettering shaft has to be, or is it good with a 4 mm shaft instead of a 3 mm shaft ???
all help is welcome
I looked online and read this :
The biggest culprit is the main rotor that is a clone of the T-Rex 450 SE, with a thin (3mm) feathering shaft. Given enough RPM, the blades will shake violently due to a physical effect called "aero elastic flutter", which is possible when the dampening is not enough. This becomes more likely as the rubber dampers get worn out.
Doing some math, the Storm comes with a 3800KV motor and a 13T pinion. For a 150T main gear, the rotor may reach way beyond 3400 RPM, but the old rotor design is limited to about 3100 RPM.
Another component associated with this failure is the cyclic bottom plate (http://www.helipal.com/stgc-040-metal-main-bearing-support-bottom.html). If this part gets cracked, warped or simply loose, lots of vibes will occur.
I've witnessed these vibes a lot of times, bending shafts included, so I call them the "Storm Vibes of Death".
Why the Storm 450 is supplied with such a combination of motor, pinion and rotor is beyond me.
Is that really possible, or not.
and how do I calculate on how big my fettering shaft has to be, or is it good with a 4 mm shaft instead of a 3 mm shaft ???
all help is welcome