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04-05-2009 07:10 PM  9 years agoPost 1
ExtremeAerosports

rrApprentice

Fishers, IN

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I've looked at a couple headspeed calculators, and with the 94t Main, and 24t Pinion, (figure stock HDX 500) with a 1000kv motor on 4 cells I'm getting 3800(ish)rpm for headspeed...that sounds like WAY too fast, but if I drop it down to 3 cells, I'm getting 2700 for headspeed. I know that that is calculated and there is no mechanical drag included, probably a complete no-load condition, but, damn, that is still spinning really fast.

Is there a calculator out there that takes blade size into consideration, or is there a 'magic' number that we can take off for certian blade lengths?

Jon

Jonathan Ott
Fishers, IN
TRex 700E DFC
Chaos 600
Lynx Heli Innovations Team Pilot

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04-06-2009 02:21 AM  9 years agoPost 2
altima1779

rrKey Veteran

Toledo, oh u.s

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The Kit i looked at says it comes with an 850 kv motor. Drop down to a 22t pinion and you can get the head-speed down to 2500 to 3000 depending on throttle curve. I don't think 3s is the way to go.

I just bought the new HC 500 and i am running mine with 6s setup. Of course that comes with the 140t main gear.

I like to use the head-speed calculator from Readyheli.

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04-06-2009 02:12 PM  9 years agoPost 3
ExtremeAerosports

rrApprentice

Fishers, IN

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I got my machine from WingMan and he threw an RCP 1000kv in with it.

I also got a Gaui 1100kv with a Thunder Tiger 75A ESC from another gentleman here on RR.

I'm not a 3D'er, just a flyer. I'm wanting to use it for "hobby" AP, so I figure the extra power of the larger motor(s) will not hurt anything but maybe my flight time.

I think my blades are 435's...if my headspead is high, could I move up to say 450's to slow 'em down and get a little more muscle in the lift department, or would the extra load of longer blades contibute to quicker demise of the motors?

Jon

Jonathan Ott
Fishers, IN
TRex 700E DFC
Chaos 600
Lynx Heli Innovations Team Pilot

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04-06-2009 02:26 PM  9 years agoPost 4
altima1779

rrKey Veteran

Toledo, oh u.s

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From what i know the higher the KV the lower cell count you want to use. For example on my outrage 550 i am running 8s with a 890kv motor. On my HC 500 i am running 6s with a 1320kv motor but i have a much higher tooth count on my main gear.

I am not sure using longer blades is the answer. First you want to make sure that you are not going to interact with the tail blades. Even if it looks like they will clear, it is very possible that you will have enough flex to have interaction.

I am no expert so maybe someone with a little more knowledge can give you a solid answer.

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06-05-2009 06:29 AM  9 years agoPost 5
Pagoda

rrNovice

Olympia, WA

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Is there a calculator out there that takes blade size into consideration?

Try this: http://dhrc.rchomepage.com/calcAdvanced.htm

As you increas the pitch, the headspeed lowers significantly.
I start with the base 'Protos 4s' and customize weight (1700 grams) and blade diameter (930mm with grips)

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