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Scorpion Power Scorpion Power
03-23-2009 03:20 AM  8 years agoPost 1
Wingman77

rrProfessor

Pulaski Tennessee

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kv is rpm's per volt right? so a 2221 kv motor on 14v with no load would run 31094rpms?

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03-23-2009 03:36 AM  8 years agoPost 2
what_the_helli

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cookeville, tn USA

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you are correct

I put the fun in dysFUNctional :)
Team KBDD & Funding by TnPrintMasters.com

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03-23-2009 03:37 AM  8 years agoPost 3
Wingman77

rrProfessor

Pulaski Tennessee

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so could I expect if I used a 13t pinion and 4s battery on a rave (177t)I would get about 2200 headspeed?

14*2221*13/177=2283

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03-23-2009 03:40 AM  8 years agoPost 4
what_the_helli

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cookeville, tn USA

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here is an easy head speed calculator you'll need to know how many teeth the main gear has.

I put the fun in dysFUNctional :)
Team KBDD & Funding by TnPrintMasters.com

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03-23-2009 03:42 AM  8 years agoPost 5
what_the_helli

rrKey Veteran

cookeville, tn USA

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I missed the tooth count in your post... here is the goods
Voltage for this calculation (min):3,552/cell with a total of 14,208
Nominal voltage: Spoolup RPM 100% throttle no governor (14,8v): 2414
Avg RPM you will see with 100% throttle and no governor: 2248

Max normal bogging applied you will see RPM at: 1970
(this number should be the minimum if your motor & battery is up for the challenge)

I put the fun in dysFUNctional :)
Team KBDD & Funding by TnPrintMasters.com

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03-23-2009 03:43 AM  8 years agoPost 6
Wingman77

rrProfessor

Pulaski Tennessee

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???? someone told me I could get 3200 rpms with this motor on 4s????
and a 13t pinion.

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03-23-2009 03:44 AM  8 years agoPost 7
Heli 770

rrProfessor

USA.

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More like 2269rpm avg.

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03-23-2009 03:45 AM  8 years agoPost 8
what_the_helli

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cookeville, tn USA

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your math is right, but your "someones" math is wrong.

I put the fun in dysFUNctional :)
Team KBDD & Funding by TnPrintMasters.com

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03-23-2009 03:46 AM  8 years agoPost 9
Wingman77

rrProfessor

Pulaski Tennessee

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it is the scoripon -8 motor.... so how am I supposed to get 3k on the head? I know some people do it with 3s

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03-23-2009 03:47 AM  8 years agoPost 10
Heli 770

rrProfessor

USA.

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I think the Rave main gear is 170T.

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03-23-2009 03:47 AM  8 years agoPost 11
what_the_helli

rrKey Veteran

cookeville, tn USA

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your going to need 3600kv to get you there on 13t

I put the fun in dysFUNctional :)
Team KBDD & Funding by TnPrintMasters.com

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03-23-2009 03:49 AM  8 years agoPost 12
Wingman77

rrProfessor

Pulaski Tennessee

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well I know some people use the scorpion -8 and get crazy headspeed with 3 and 4s batts, how do you do it?? put a 19t pinion on?

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03-23-2009 03:50 AM  8 years agoPost 13
what_the_helli

rrKey Veteran

cookeville, tn USA

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check your stats....

HK2221-8
Rm = 0.0241 Ohms
Io = 2.395 amps @ 10.5 volts
Kv = 3595
Weight = 76 grams, 2.68 ounces
Max Current = 45 amps for 1 minute
Shaft: 3.2mm

the 2221 is

Stator Diameter ............................ 22.0 mm (0.866 in)
Stator Thickness ........................... 21.0 mm (0.827 in)

the -8 is
Motor Wind ............................................ 8 Turn Delta

I put the fun in dysFUNctional :)
Team KBDD & Funding by TnPrintMasters.com

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03-23-2009 03:54 AM  8 years agoPost 14
Wingman77

rrProfessor

Pulaski Tennessee

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thanks man
that puts me up to about 3k on 10t

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03-23-2009 03:55 AM  8 years agoPost 15
Heli 770

rrProfessor

USA.

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HK2221-8
4S, 11T, avg. head speed 3107
3S, 14T, avg. head speed 2966

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03-24-2009 04:01 AM  8 years agoPost 16
Wingman77

rrProfessor

Pulaski Tennessee

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how should I run it with my cc35? govener mode or a curve?

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03-24-2009 04:20 AM  8 years agoPost 17
Heli 770

rrProfessor

USA.

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I would re-think the ESC. That motor can pull 45amps continuous. No gov. and 100% flat in Idle-up.

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03-24-2009 04:22 AM  8 years agoPost 18
Wingman77

rrProfessor

Pulaski Tennessee

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well I already have a cc35 and cannot afford a 45

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03-24-2009 04:28 AM  8 years agoPost 19
Heli 770

rrProfessor

USA.

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Do you have a external BEC on it? You should have if you're running 4S.

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03-24-2009 04:29 AM  8 years agoPost 20
Wingman77

rrProfessor

Pulaski Tennessee

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yes I am using the ccbec. can the motor over speed? or is it faze locked?

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