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Old 11-10-2009, 03:55 AM   #1
Incredible319
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Hi guys,

I am trying to figure out why everybody seems to be looking for about 2000 - 3000 rpm setup for headspeed.

I know that more headspeed means more stable heli etc..

But what happens if you have 4000 rpm and above headspeed? Is it because the rotor mechanism cannot take it and it could fracture or feathering shaft etc gets spoilt that we dont use it?

Or has it got to do with electronics (motor and pinion meshing together with main gear cannot reach such a high headspeed)?

Just curious to know!

thanks!
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Old 11-10-2009, 05:11 AM   #2
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What size helicopter are you referring to?
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Old 11-10-2009, 06:38 AM   #3
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hi,

i would prefer the question answered with regards to a 450 size,

Does it infer that other class helis can actually go at very high rpm?

thanks a lot!
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Old 11-10-2009, 07:35 AM   #4
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Well the 450 class can turn 4000 HS but it is pretty hard on the head components, my 250 turns 4800, and because of that it does not last long between rebuild...
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Old 11-10-2009, 08:32 PM   #5
Incredible319
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Quote:
Originally Posted by snjbird View Post
Well the 450 class can turn 4000 HS but it is pretty hard on the head components, my 250 turns 4800, and because of that it does not last long between rebuild...
hi snjbird,

thanks!

so its got to do with mechanical strength...prob i will try to increase my headspeed by using a diff, pinion on my heli..

cheers
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Old 11-10-2009, 08:42 PM   #6
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More headspeed = more amp draw = less flight time.

Alot is personal preference. I started slow, turned it up, and now slowed it back down just because i like being in the air longer. There's a headspeed calculator somewhere on the internet. It helps to use it when playing with pinions.

hope this helps

mike
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Old 11-10-2009, 08:47 PM   #7
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Quote:
Originally Posted by MKlinkerRC View Post
More headspeed = more amp draw = less flight time.

Alot is personal preference. I started slow, turned it up, and now slowed it back down just because i like being in the air longer. There's a headspeed calculator somewhere on the internet. It helps to use it when playing with pinions.

hope this helps

mike
hi Mike,

Indeed..i started with a low throttle curve also for hovering but now i changed it to about 80% and above hovering pt..

the heli is fantastic to hover in the wind.(the settings were recommended by a nice gentleman on the forum0

i have set 2 flight modes on my JR (one for windy days(the one above) and the low one to be in air longer times or if am using some old batteries etc)

i will check that headspeed calculator out

thanks!
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Old 11-10-2009, 11:26 PM   #8
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Quality carbon fiber blades can take high rpm, but most wooden and fiberglass blades have warnings at around 2400rpm or so on a 450. I'm running 3200 rpm on my Exceed Blueray 450 because I like it to behave more like my T-Rex 600 Nitro Pro, which is very stable and acrobatic at 2000rpm; but, unfortunatey this means I get 3 and a half minute flight times. I get 8 minutes on my 600 and fly it a lot more since I live close to a flying field.
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Old 11-11-2009, 12:35 AM   #9
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Quote:
Originally Posted by Incredible319 View Post
Hi guys,

.

I know that more headspeed means more stable heli etc..



!
Depends on your deffinition of stability. The higher the rpm, the more responce you have. The more control you have in wind. More authority with any move. Also the more quik, squirly with respects to instantainious responce. For some the control equals stability. Others a more docile HS provides more stability. Slower to get out of control.
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Old 11-11-2009, 12:47 AM   #10
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for a 450, just stay around 3300-3800, that's the optimal range, 4000 might be fun at first, but it's kinda useless when you want to actually "fly"
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Old 11-11-2009, 09:09 AM   #11
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Quote:
Originally Posted by brian94066 View Post
for a 450, just stay around 3300-3800, that's the optimal range, 4000 might be fun at first, but it's kinda useless when you want to actually "fly"
I'd say thats way higher than optimal.

3,000 to 3,300 would get my vote for optimal.
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Old 11-11-2009, 08:15 PM   #12
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Hi guys!

thanks for all yr replies..

hmm i never checked whats my rpm at the moment.

i will probably increase my headspeed to 3000 rpm.Am only hovering at this point as i just started..

cheers
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