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HelicopterMain Discussion › difference between scorpion 6 8 and 10 motors?
03-18-2009 12:59 AM  8 years agoPost 1
Wingman77

rrProfessor

Pulaski Tennessee

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I am looking for the best one on 3s and hopefully one that will work with 3 and 4s.

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03-18-2009 02:53 AM  8 years agoPost 2
kkent25

rrNovice

Calgary, Alberta,​Canada

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I have a 6 with 55amp ESC. This combo eats batteries up pretty bad. When running at 100% this motor is crazy fast but like I said the batteries come off the heli smoking hot after a 5 min. flight. I had to back the throttle curve back to 75% to reach a balance between power and low battery stress. If you are a 3D monster the 6 may be a good way to go. Otherwise stick with the 8 or 10.

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03-18-2009 03:30 AM  8 years agoPost 3
Aox

rrApprentice

Irvine, CA

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-8 is your best bet for 3 and 4. Gear for the headspeed you want by calculating it out. I've read some posts about guys flying 2400ish -10 on 3s. The -8 will be powerful on 3s, and nutty on 4s.

-6 is 4400kv
-8 is 3595kv
-10 is 3000kv

IMO, the -6 is the "psycho 3d" motor for 3s. Beats the crap out of your packs if you fly hard. Flying this motor, I would get 3:30 of flight time before my packs got hotter than I deem acceptable. I flew this motor on my Rave when I first got it.

IMO, the -8 is the best 450 motor for 3s, and will do some psycho 4s. Works your 3s packs, but acceptably, and gives a nice 4:30 - 5:00 of hard 3d. I have no experience with this motor on 4s, personally, but I know some pilots fly Raves with it on 4s. I fly this on 3S on my MiniTitan. It was one hell of an upgrade from the stock Ripper motor.

IMO, the -10 is the "proper" 4s motor. Silly power at 4s, and nice flight times. I now fly this motor on 4s on my Rave, and I'm pushing it harder and harder with each flight. I have only put a max of 1625 back in after 5:30 of hard flying.

I have found on the Rave that I don't need to run a balls out headspeed with the 350mm blades to get super nice 3d ability. I ran 100 flat on 3s configs, but I'm running 95-85-95 on the 4s Rave with 350mm blades and that's giving me some nice run times.

To calculate headspeed:

Find your gear ratio, and use the nominal voltages of 11.1 and 14.8 for 3s and 4s packs, respectively.

"Main gear/pinion" = Gear ratio

"Motor Kv x Voltage x .90" = Motor RPM at 90 percent efficiency

"Motor RPM/gear ratio" = resulting headspeed

So say we have a Trex 450, and we want to get around 3k headpseed with 4s and a -8

Trex main gear is 150T. Let's start with a 12T pinion. A truth math wiz will show you how to start with your headspeed and calculate back to your pinion, but that's beyond the scope of this post, due to beer.

150/12 = 12.5

12.5 x 3595 x .90 = 40443.75

40443.75/12.5 = 3235 resulting headspeed. Now that's cookin. You'll see higher than this during flight, because our voltage was "nominal" not actual, so you'll want to lower your curve or else you're going to subject your rexxy to a what I'm guessing will be a 3400+ headspeed at the beginning of your flight on a fresh pack. I don't know if you can get a pinion smaller than 12T in that modulus and shaft size. Probably so. You'd want to.

So the -8 will do it, but you'll be screamin at 4s. Run a curve of 85-75-85 or 80 flat, or find a smaller pinion and I bet you'd be fine. You always want to gear to run your curve as high as possible in idle 2 for efficiency's sake. The motor will be most efficient at 100 percent throttle. If you do run the reduced curves, then monitor your esc for heat buildup on your first couple of flights. If heat is fine, then you're good to go.

Hope this helps.

-Aox

Synergy N9~/~Trex250-450-600N~/~Logo 500 3D~/~Rave 3D~/~Mini-Titan A109K2
AMA #902257 - OCMA

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03-18-2009 05:00 AM  8 years agoPost 4
Wingman77

rrProfessor

Pulaski Tennessee

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wow that helped alot, so I think I am sold on the -8 I think I need a 11t pinion for 3s right?

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03-18-2009 05:04 AM  8 years agoPost 5
Wingman77

rrProfessor

Pulaski Tennessee

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will these be the right pinions for the -8 motor? I cannot figure out what the size of the motor shaft is.

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03-18-2009 05:11 AM  8 years agoPost 6
Heli 770

rrProfessor

USA.

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3.17mm.

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03-18-2009 02:30 PM  8 years agoPost 7
Wingman77

rrProfessor

Pulaski Tennessee

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so those wont work, which ones will?

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03-18-2009 03:12 PM  8 years agoPost 8
Heli 770

rrProfessor

USA.

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Are you saying the output shaft is not 3.17mm?

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03-18-2009 04:08 PM  8 years agoPost 9
Wingman77

rrProfessor

Pulaski Tennessee

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no, the pinions say 2.3mm so they wont fit. right?

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03-18-2009 04:09 PM  8 years agoPost 10
Heli 770

rrProfessor

USA.

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You need a 3.17mm or 1/8in. bore on the pinion gear.

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03-18-2009 04:11 PM  8 years agoPost 11
Wingman77

rrProfessor

Pulaski Tennessee

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well how big are these?? I don't see that it says it.

http://www.powerhelis.com/prodinfo.asp?number=HZ020

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03-18-2009 04:13 PM  8 years agoPost 12
Heli 770

rrProfessor

USA.

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I forgot,
Your average head speed with the HK-2221-8

11T, 2641rpm
12T, 2881rpm
13T, 3121rpm

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03-18-2009 04:19 PM  8 years agoPost 13
Wingman77

rrProfessor

Pulaski Tennessee

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is that on 3s?

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03-18-2009 04:25 PM  8 years agoPost 14
Heli 770

rrProfessor

USA.

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Yes.

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03-18-2009 04:27 PM  8 years agoPost 15
Wingman77

rrProfessor

Pulaski Tennessee

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can you give me a link to some pinions with 3.17mm inside diameter?

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03-18-2009 04:34 PM  8 years agoPost 16
Heli 770

rrProfessor

USA.

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Ready Heli has a large selection of pinions, it's under motors. You will need a Mod .5 with 3.17 bore.

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03-18-2009 04:37 PM  8 years agoPost 17
Wingman77

rrProfessor

Pulaski Tennessee

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so this is what I need to get about 3k with 3s?

http://www.readyheli.com/RevCo_Hard...n_p/ho-1013.htm

and this would give about the same with 4s?

http://www.readyheli.com/RevCo_Hard...n_p/ho-1011.htm

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03-18-2009 04:50 PM  8 years agoPost 18
Heli 770

rrProfessor

USA.

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The first one is good for the 3S. I need to Calc. for the 4S.

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03-18-2009 04:57 PM  8 years agoPost 19
Cheech91060

rrApprentice

Aberdeen, MD

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For headspeed, 13 tooth on 3s is comparable to 10 tooth on 4s.

Frank
HBFP, Trex 450, Vibe 50

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03-18-2009 05:03 PM  8 years agoPost 20
Heli 770

rrProfessor

USA.

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You have a problem, With a 11T pinion your average head speed will be 3521rpm. I don't know of anyone that makes 9 or 10T pinion with a 3.17 bore. The bore diameter is too large for a 9 or 10T pinion.

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HelicopterMain Discussion › difference between scorpion 6 8 and 10 motors?
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