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250 Class Electric Helicopters 250 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 07-26-2010, 07:58 PM   #1
weelee
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Default Head speed

I have a 5000KV motor on 12T pinion. Headspeed is said to be about 5200 at 100%throttle. What should it be? I have the plastic blades and a set of carbons.
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Old 07-27-2010, 11:54 AM   #2
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5000kv X 11.1V x12t / 120t X 90% efficienty = 4995RPM. Depending on your motor, you're likely less than 90% efficient. I'm using the Turnigy 4800kv motor with a 12t pinion and my headspeed is measured at 4450RPM.
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Old 07-27-2010, 12:06 PM   #3
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Cheers i was wondering if anyone was going to respond. So with Carbon blades i should be fine. What about the plastic ones?
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Old 07-27-2010, 12:10 PM   #4
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Not sure what they are rated for. Why bother?
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Old 07-27-2010, 12:15 PM   #5
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Just for set up. Don't want to wreck my new CF blades in the first flight because something went wrong. I'd rather trash the plastics.
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Old 07-27-2010, 02:12 PM   #6
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Maybe lower your throttle curve for the initial setup, then install the CF's for 100% flat and final setup. Not really sure what the plastics are rated for.
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Old 07-27-2010, 04:03 PM   #7
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you'll be fine with plastics on the 250. i guarantee the carbons will break before the plastic ones do .. the decision on plastics and carbons on my 250 are about response not headspeed .. carbons have a faster response, also on mine anyway switching between blades can throw the whole setup off and how the tail reacts so i would just put on whatever you plan on flying to dial in the bird .. want a more forgiving cyclic feel go plastic, want it real crisp use carbons ..
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Old 07-27-2010, 08:23 PM   #8
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wow, guarantee huh? thats a big statement. I wouldn't use anything but carbons at those headspeeds as they may fly apart. I don't no about you but I wouldn't wanna catch a blade at that speed or anyspeed for that matter!
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Old 07-29-2010, 07:31 AM   #9
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Aling caution not to go over 4660 head speed..you guys are looking for trouble...
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Old 07-29-2010, 09:07 AM   #10
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I'm not sure why you think you need 5000 HS, I fly mine at 4500 in set rpm mode with a castle creation ESC, I have the Scorpion 2208-3600 motor and a 16tooth pinion.
The motor you are using is probably a 2S motor, like on a Guai. But I would think that the CF would be the only blade I would spin that fast?
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Old 07-29-2010, 09:59 AM   #11
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For a very brief time I ran a Scorp 3900kv and a 16T pinion, while I was waiting for the 15T to come back in stock after an unfortunate grub screw stripping. I tached the HS at 100% and it was 5200ish. I flew it for 2 packs that way and was nervous the whole time. I later reduced it to 85% which brought it back to the 4500-4600 range which is a great HS.

The plastics "probably" won't break at that speed but they will track like crap! You may run the risk of a crazy vibe and tracking issues that may cause problems because they are so flexible. I wouldn't even consider of running the plastics at 4500+ HS on mine
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