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Home✈️Aircraft🚁HelicopterAerial Photography and Video › Low headspeed for AP heli?
09-09-2006 08:09 PM  14 years ago
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catfight

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USA

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Low headspeed for AP heli?
I am a noobie to aerial photography and using a trex for platform.

What are the advantages or disadvantages to lowering headspeed? I am currently using 450TH motor, 13 t, and Maverikk 320 CF blades. Other than changing pinion from 13 t to 11 t what else must be done to tx or heli? I don't understand why lower headspeed is a good thing- I thought the faster the blades turned the more % of lift. Can anyone explain the principles for this?

Also what are good values of headspeed for trex in this configuration?

Thanks
What goes up must come around
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09-09-2006 08:18 PM  14 years ago
DANNO

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St. Petersburg, Florida

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lower headspeed gives a slower (smoother) responce to input. less jerky. also you can get longer flight times with electrics.
downside is less lifting power. i may be wrong, but i think you can lower your headspeed and increase your rotor diameter for higher lifting power.
www.skypiximaging.com
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09-09-2006 08:37 PM  14 years ago
catfight

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USA

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Danno,

So you don't have to increase pitch settings when you lower headspeed? I really like these Maverikk 320 CF blades - does anyone make good quality longer CF blades I should consider?

Thanks for the help
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09-09-2006 08:49 PM  14 years ago
Nate Dogg

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Kihei, Hawaii

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CF blades are bad for AP with the rex. They take too much power to swing, drawing more amps and increasing the temperature of your lipos and esc and motor. The 325 pro woodies are working good for me. I have a 430l motor, 13t pinion, 2100tp 3s lipo, cc35 esc, and 240 gyro. I'm getting almost 15 minutes of hover time with a 1800-2000 headspeed and everything is just slightly warm. 4s is really the way to go to get long flights, but you have to use a 9t pinion...
I have yet to try the 335 pro woodies from align... Best of luck!
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09-09-2006 10:28 PM  14 years ago
catfight

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USA

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Nate,

How do you get 1800-2000 headspeed with 13t?
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09-10-2006 02:39 AM  14 years ago
BigguyOz

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Forster, New South Wales, Australia

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I tach'd my Trex with 430L, 13T and 325PRO woodies at 2750 (zero pitch), so you would have to be stressing the ESC by running a low throttle setting to get HS down to 2000. I swapped to a JGF 450TH on an 11T pinion, and still had about 2200 HS, which is at least within the range for running the ESC at slightly under full throttle.

Interesting to hear that you aren't experiencing ESC heat issues...
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