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horsepower of your esc and motor combo

Old 12-06-2010, 06:43 AM
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4goodbuys2
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Default horsepower of your esc and motor combo

amps X volts = then multiply this by .00134 and you have horsepower.

Here's what the velineon vxl has

7.4 1.9 hp continuous
3.1 hp peak

11.1 2.9 hp continuous
4.7 hp peak

Post up what your esc and motor has, to give everyone a idea of what each company offers.

Old 12-06-2010, 06:53 AM
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LewAshby
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Default RE: horsepower of your esc and motor combo

That isn't enough to power a 3/4 ton pickup truck [&o]
Old 12-06-2010, 07:03 AM
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4goodbuys2
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Default RE: horsepower of your esc and motor combo

Use a very small pinion and a really big spur gear.
Old 12-06-2010, 07:17 AM
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Default RE: horsepower of your esc and motor combo

ORIGINAL: 4goodbuys2

amps X volts = then multiply this by .00134 and you have horsepower.
According to http://www.elec-toolbox.com/Formulas/Motor/mtrform.htm
the formula should read
HP = (V x I x Eff)/746

HP = horsepower
V = voltage
I = curent (amps)
Eff. = efficiency

OR
HP = (rpm x T)/5252(constant)

T = torque

According to your calculation every 60A motor, and ESC would be the same HP no matter the manufacturer which is not true seeing some are more efficient than others (which is what you forgot)
Old 12-06-2010, 07:21 AM
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MCSRacing
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Default RE: horsepower of your esc and motor combo

okay, so if ur multiplying amp/volts ... how are you getting your amperage reading for the amp draw? and different gearing will pull a different amount of amps ... haha psycho .... nevermind lol
Old 12-06-2010, 08:13 AM
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4goodbuys2
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Default RE: horsepower of your esc and motor combo

I guess its to hard to find out what would make it to the wheels with the transmission and the wheel size and all the other variables.
I guess I could build a very small dyno to run it on.

Old 12-06-2010, 08:34 AM
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Default RE: horsepower of your esc and motor combo

ORIGINAL: MCSRacing

okay, so if ur multiplying amp/volts ... how are you getting your amperage reading for the amp draw? and different gearing will pull a different amount of amps ... haha psycho .... nevermind lol
Well you can get an estimation of max HP your motors capable of putting out based on the maximum rated amp draw of the motor. But still you need its efficiency or torque rating for that, which I find lacking on most RC motors specs.
The ESC rating, gearing, and tires would have nothing to do with the theoretical max HP the motor can put out. Seeing the calculation is to see what the motor can do. Like Nitro engines the HP rating for a engine is the same no matter what RC you put it in. The gearing, and other factors is just how the power is put to use.
Old 12-06-2010, 09:59 AM
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J.D.T
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Default RE: horsepower of your esc and motor combo

I think you math is off a bit or you are using to high of voltage and amp guesstimations.
A vxl is barely 1 horsepower on 3s, the highest pulling vxl motor I have ever seen draws about 72 amps and that was a fairly old beat up one, 72 x 7=504 watts, 72 x 10 is 720 just shy of one horsepower, batteries will never hold there peak voltage under a load, a good 2s will easily hold 7 volts and a good 3s will easily hold 10 volts under load so use them for easy generalizations but syco is right, efficiency and even design characteristics mean two identical looking motors could produce vastly different results. 10 volts at 80 amps at 50% efficiency is only 400 watts, 10 volts at 80 amps at 75% efficiency is 600 watts.
A 36 x 46 lehner basic series will stomp a mudhole in the but of all but the best 36 x 50 brushless motors even though its shorter it has better efficiency and better components which equal more power.

745-780 watts is what is usually considered to be 1 horsepoer.
Old 12-06-2010, 10:37 AM
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4goodbuys2
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Default RE: horsepower of your esc and motor combo

I thought the hp I came up with was way to high .
I was using 320 amp as the peak and 200 amp as the regular the rating of the esc I should have been using the ratings of the motor I guess.
3 hp would probaly be more of a 1/8 brushless combo instead of a 1/10.
Old 12-06-2010, 01:54 PM
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Lilredmachine
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Default RE: horsepower of your esc and motor combo

The most I've ever seen a Flux system put out on an Eagletree is 3000w, or 4.4hp. Why anyone would want to bother working it out though is anyone's guess. The only way to really find out what your setup is putting down is to strap and Eagletree on to it and watch the recorded data back. Working it out from the manufacturers specs is about as much use as a chocolate teapot, a velinion motor is 'rated to' 75a, which means that you can run it to that (for a short time) before it melts. If it averages more than about 30a during a run i'd be really surprised.

Biggest system I've ever seen in a small scale RC is a build over on RC-Monster that used a special chassis to hold 14s lipo cells and a huge Lehner/MGM combo. Recorded 9,000w on an Eagletree Graph, or over 13hp. In a Savage.
Old 12-06-2010, 02:57 PM
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Krazy Chicken
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Default RE: horsepower of your esc and motor combo

someone needs to make a scale dyno for these trucks, would be interesting to see the numbers at the wheels.
Old 12-07-2010, 03:32 AM
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Default RE: horsepower of your esc and motor combo

No Vxl is putting out 5 peak horse. nice try.

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