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HomeScaleAircraftHelicopterScale Model RC Helicopters › Project from Hell
05-29-2013 10:59 PM  5 years agoPost 1
capt 65

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seabrook, texas usa

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[B]Two years ago I started on building a 500D, and the problems just keep jumping up, here is the latest of a long list. Here is the current set-up
T-Rex 600E 5 blade head
Motor - Century 800 KV
Main Gear - 188T
Pinion Gear - 13T
Battery - 6 cell 5000 mah Lipo
ESC - CC ICE2 HV 80 (newest change)

In programing esc everything was very straight forward until the governor section, I was told to use "Set RPM" mode, things still seem to be ok until "Desired Head Speeds" window popped up. No matter what speeds I put in the response was "Should consider changing gearing or battery pack. HELP

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05-29-2013 11:36 PM  5 years agoPost 2
Keygrigger

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Mississauga, Ont. Canada

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Off the bat, your motor and gearing is not very well suited to the usual speeds needed by such a setup. You would have a better chance with either changing the motor to a higher kv rating (not too high, though. 890kv for example) or changing the gearing to better match your motor. When you actually plug your motor, battery, main and pinion gears into a calculator, the best you can hope to get is about 1027rpm on the head. That is not enough head speed to lift an average 600 size scale helicopter and fly it normally.

To keep it 6s, you should think about changing to the 115t main gear with an 11t (1427rpm) or 12t (1543rpm) pinion. That is keeping with the 800kv motor and 6s battery. I have the same helicopter with a 12s system in it using a 450kv motor but with a Logo chassis. I am also thinking about a smaller tooth main gear but a larger pitch for better strength. That is why I recommend going with the 115t main gear. Get Mr. Mel's calculator from HF or the one from scalerchelis.com and you can work with those to help you see how you can get your system running. The latest CC ESC's will let you run a governed 95% of full speed but to be easier on your system and have a more usable flight time, go with 92.5% for your desired head speed. Hope this helps.

Don

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05-30-2013 12:52 AM  5 years agoPost 3
capt 65

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seabrook, texas usa

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Don, Thanks very much will change gears asap.

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