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Insane Dyno Results - 6/28/2008 6:53:32 AM   
SD2006


 

Posts: 349
Joined: 8/19/2006
From: Iowa City, IA, USA
Status: offline 		I finally got my flywheel dynomometer back in operation and decided to test my new PolyRC 3S 4900 LiPo battery. Wow these things pack a rediculous about of current. Had I not tested it myself I never would have believed a battery this size could deliver 288 amps for short bursts. The attached dyno chart is equally impessive, with a peak of over 2.1 horsepower I'm starting to understand why my car is so hard to contol. Nitro is for suckers!!!



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       Post #: 1

RE: Insane Dyno Results - 6/28/2008 6:59:32 AM   
muti369



Posts: 330
Joined: 10/16/2007
From: boise, ID, USA
Status: offline 		thats insane what motor is that

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       Post #: 2

RE: Insane Dyno Results - 6/28/2008 7:36:19 AM   
PENGUINBLASTER!!!



Posts: 498
Joined: 1/13/2007
From: , AFGHANISTAN
Status: offline 		Is that like a NEU 1521? There's no way a 540 brushless motor could make that much power.

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       Post #: 3

RE: Insane Dyno Results - 6/28/2008 3:10:59 PM   
Lilredmachine


 

Posts: 916
Joined: 1/5/2006
From: Shanklin, UNITED KINGDOM
Status: offline 		It's obviously a decent motor if it's pulling 288amp bursts out of the pack. I'd guess at a Neu or a Lehner either of which are perfectly capable of hitting 2000watt outputs (2 kilowatts or 2.9hp) from a 550 size can.

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       Post #: 4

RE: Insane Dyno Results - 6/28/2008 3:31:54 PM   
Takedown



Posts: 7795
Joined: 3/28/2004
From: Oshkosh, WI, USA
Status: offline 		Ive seen Neu's draw 321a bursts before and its a 550 size can. Extremely low winds along with high gearing gets you their.

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Got a 1/5 MT.

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       Post #: 5

RE: Insane Dyno Results - 6/28/2008 3:34:04 PM   
Longhair



Posts: 3319
Joined: 12/28/2005
From: NA, , NETHERLANDS
Status: online 		With such low torque, that thing won't give good results when in the rc unless it was for a road car on pavement doing down hill with the wind pushing it.

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       Post #: 6

RE: Insane Dyno Results - 6/28/2008 3:39:17 PM   
Takedown



Posts: 7795
Joined: 3/28/2004
From: Oshkosh, WI, USA
Status: offline 		The new Neu 1509 "Supermassive" draws 230a bursts and its a standard 540 size motor.

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Got a 1/5 MT.

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       Post #: 7

RE: Insane Dyno Results - 6/28/2008 5:01:58 PM   
SD2006


 

Posts: 349
Joined: 8/19/2006
From: Iowa City, IA, USA
Status: offline
quote:

ORIGINAL: muti369

thats insane what motor is that


The motor is a Lehner Basic XL 4200 and the speed controller is a BK Warrior 9918. Even though the peformance is decent, my next motor will definitely not be a Lehner.

In testing this combination on a flywheel dyno I've found it's best to gradually bring the RPM up to 5000 and then nail the throttle. The Warrior has a built-in .3 second ramp-up time delay so that further skews the low end performance results. For this power curve I'd ignore anything below about 10,000 RPM.

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       Post #: 8

RE: Insane Dyno Results - 6/28/2008 5:06:48 PM   
SD2006


 

Posts: 349
Joined: 8/19/2006
From: Iowa City, IA, USA
Status: offline
quote:

ORIGINAL: Longhair

With such low torque, that thing won't give good results when in the rc unless it was for a road car on pavement doing down hill with the wind pushing it.


So 0.65 Newton-Meters of torque isn't enough for a 1/10th scale RC car? What's your recommended minimum? What does a really good motor put out?

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       Post #: 9

RE: Insane Dyno Results - 6/30/2008 2:21:45 AM   
SD2006


 

Posts: 349
Joined: 8/19/2006
From: Iowa City, IA, USA
Status: offline 		I just ordered a Castle CMS36 4600kV motor and will run it on the dyno when it arrives. Any predictions on how it will compare to the Lehner 4200?

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       Post #: 10

RE: Insane Dyno Results - 6/30/2008 2:39:51 AM   
Takedown



Posts: 7795
Joined: 3/28/2004
From: Oshkosh, WI, USA
Status: offline
quote:

ORIGINAL: SD2006

I just ordered a Castle CMS36 4600kV motor and will run it on the dyno when it arrives. Any predictions on how it will compare to the Lehner 4200?

Wont even... Im guessing around 800w-900w meaning about 1hp.

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Got a 1/5 MT.

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       Post #: 11

RE: Insane Dyno Results - 6/30/2008 3:42:58 AM   
SD2006


 

Posts: 349
Joined: 8/19/2006
From: Iowa City, IA, USA
Status: offline 		Are the k/V ratings derived differently or are the Castle motors really that bad?

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       Post #: 12

RE: Insane Dyno Results - 6/30/2008 4:44:18 AM   
tire smoke


 

Posts: 111
Joined: 5/4/2008
From: No city, USA
Status: offline 		Hey, can you tell me some about this dyno i'm interested.

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       Post #: 13

RE: Insane Dyno Results - 6/30/2008 5:45:19 AM   
SD2006


 

Posts: 349
Joined: 8/19/2006
From: Iowa City, IA, USA
Status: offline 		It's pretty simple, just a flywheel with an optical pickup that sends the revolution pulses to a cheap ($50) DATAQ DI-148U data logging unit. After a "pull" on the dyno I calculate torque and power in a spreadsheet using the moment of inertia for the flywheel (~.000049 Kg-M^2) and an air resistance drag factor which I derived from some coast-down tests.

I feel it's reasonably accurate for determining outright power, but I use it mainly to compare differences between batteries and motors, and to help select gear ratios for top speed runs.


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       Post #: 14

RE: Insane Dyno Results - 6/30/2008 9:49:28 AM   
Lilredmachine


 

Posts: 916
Joined: 1/5/2006
From: Shanklin, UNITED KINGDOM
Status: offline
quote:

ORIGINAL: SD2006

Are the k/V ratings derived differently or are the Castle motors really that bad?


KV really has very little to do with overall performance, it's just a figure meaning what the motor will attempt to spin per volt whilst unloaded. Like a real engine, it could be cranking 1500hp, but put it in a draggy AWD vehicle and that could drop to 1200 at the wheels. Use the motor in an RC and you'll find there are far more important factors in performance, such as gearing, weight, architecture of the motor, heat dissipation etc.

There is a massive quality jump between the Lehner and CMS36 motor, the Castle will run hotter, be less efficient and generally be less powerful than the Lehner, regardless of it's inflated KV rating.

(in reply to SD2006)
       Post #: 15

RE: Insane Dyno Results - 7/1/2008 12:38:46 AM   
SD2006


 

Posts: 349
Joined: 8/19/2006
From: Iowa City, IA, USA
Status: offline 		For $85 I figured it would less efficient and have a little less power than my Lehner, but with a 3S Lipo I imagine it will push my RC10 to 55+ mph with the right gearing and tires.

(in reply to Lilredmachine)