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Makiedog
rrVeteran Minneapolis |
Headspeed limit for 1.8m rotor diameter For my cobra, I'm using 419 GRP blades (810mm) mounted to Vario metal grips (don't remember part #). Is it not safe to run at 1300 rpm? Am I supposed to stay under 1200rpm?![]() |
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Notar
rrKey Veteran Taxachussetts |
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Makiedog
rrVeteran Minneapolis |
There bolts are 4mm with the unthreaded shoulder. Here it is running at 1200 rpm, I think I'll live with it. I was also advised not to use the Vario 40° angled tail gear box with the plastic gears for this size heli. I've since ordered the replacement metal gears which will help me sleep better.Pat |
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Notar
rrKey Veteran Taxachussetts |
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Makiedog
rrVeteran Minneapolis |
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Notar
rrKey Veteran Taxachussetts |
What is your all up weight? |
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Makiedog
rrVeteran Minneapolis |
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![]() rrKey Veteran Punta de Mata, Monagas-Venezuela |
Notar The only other upgrade would be to get new grips and the 5mm bolts for the blades. /That is correct.Talking about rotors headspeed limits, the weakest part is not the bolts! It is the grip and of course, The blade.Talking about tail rotors, we know it's handle about 4% of total rotor torque. The larger the boom, the less torque it handle. The larger the tail rotor diameter, tail servo handle same force. The difference is the tail pitch angle.Turbines .vs. gas motor.Good point. More torque means more driving forces... So metal gears./ |
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Notar
rrKey Veteran Taxachussetts |
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![]() rrKey Veteran Punta de Mata, Monagas-Venezuela |
/Electric helis... I forgot it.Constant torque... No matter what rpm is working... Metal gears./ |
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Makiedog
rrVeteran Minneapolis |
Notar Vario Benzin Cobra does use the plastic gearbox. The turbine version uses the metal unit. The turbine version weighs in at 28 lbs while the electric benzin version comes in at 21 lbs. You can see where you end up at as far as weight. |
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Notar
rrKey Veteran Taxachussetts |
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mbvario
rrNovice Chesterfield,MI |
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Notar
rrKey Veteran Taxachussetts |
Joe |
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mbvario
rrNovice Chesterfield,MI |
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