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Old 04-26-2011, 02:39 AM   #1
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Default Octa Wind and Non Octa Wind

Hi everyone,

Could anyone tell me what's the pros and cons of using an Octa Wind X12 LRP Motor compare to a non Octa Wind one?
Is the speed among the two has huge difference?

LRP official page shows that a 5.0T Octa Wind motor produces more power(W) then the 5.0T non Octa Wind does but RPM and KV is less then a 5.0T non Octa Wind. How is that possible and what does the data imply??

Last edited by keithlaw; 04-26-2011 at 03:22 AM.
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Old 04-26-2011, 05:26 AM   #2
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It simple, it has more torque (normally refered to as bottom end) and subsequently has less RPM as a side effect. Keep in mind that motors with lots of torque also have a larger impedance on the chassis handling relative to the grip available. So for that reason select the motor relative to your track conditions.
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Old 04-26-2011, 07:51 AM   #3
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Thank you for the reply.

but torque can be amplified by gear ratio, so the torque doesn't really matter. Isn't that RPM higher the better?
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Old 04-26-2011, 07:58 AM   #4
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Quote:
Originally Posted by keithlaw View Post
Thank you for the reply.

but torque can be amplified by gear ratio, so the torque doesn't really matter. Isn't that RPM higher the better?
horsepower is Torque x RPM so both are important.
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Old 04-26-2011, 08:18 AM   #5
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Oh yeah. It makes the power band wider with the increased torque.
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Old 04-26-2011, 08:33 AM   #6
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Quote:
Originally Posted by keithlaw View Post
Oh yeah. It makes the power band wider with the increased torque.
Not necessarily though often true.
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Old 04-27-2011, 04:28 AM   #7
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Quote:
Originally Posted by wingracer View Post
horsepower is Torque x RPM so both are important.

Please know your shit before you post....

Its

Nm x rpm = kW
9550

Kv ratings on BL motors are mostly irrevant.. but it does tell at least on the same series what direction the development has taken.

In this case.. Lower revs but more power.
If i remember right the octa wind got better efficiency too.

for comparison across manufacturers its useless.

Corally X-BP 4T delta (something something) goes 13000rpm pr Volt!
but it produces less power than the low turn Octawings.

If my memory serves me right..
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Old 04-27-2011, 06:01 AM   #8
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Please know YOUR shit before YOU post...

The power output of an engine is equal to the force it exerts multiplied by its velocity.
In rotational systems, power is related to the torque (τ) and angular velocity (ω): P(t) = Torque (t) x v (t).

For an electric motor, the instantaneous electrical power P delivered to a component is given by P (t) = V (t) x I (t)

where
P(t) is the instantaneous power, measured in watts (joules per second)
V(t) is the potential difference (or voltage drop) across the component, measured in volts
I(t) is the current through it, measured in amperes

In none of the textbooks on the subject are there any constants as multipliers or divisors, so I can only assume that you are trying to make some unit conversions. This is not necessary for an electric motor.

This information is freely available from any source on the internet, so I recommend that people look these things up for themselves and not rely on things posted on here. If I believed everything that everyone writes on these forums, I have been doing my RC racing, and my engineering, wrong for about 40 years!!

The current in an electric motor provides the torque, and the voltage provides the revs (or angular velocity) so Wingracer's description is correct.

Which, I am afraid, does not help the original poster answer his question. Our experience with X12 Octawind motors is that they run hotter than others, but do seem to have more power when geared and timed correctly. My experience is that motors from Tekin, GM and the X11 LRP are less fussy to work with. HTH
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Old 04-27-2011, 10:18 AM   #9
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Thank you slower one. It's funny that he proved my own point for me with his own equation. Nm is torque, which he then multiplied by RPM to get kilowatts (after a division to convert the measures), which is just another scale for horsepower. Exactly what I said.

Of course then he goes to explain how useless kv ratings are, which is true because that is NOT horsepower and has nothing to do with the equation he posted.
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Old 04-27-2011, 10:39 AM   #10
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Default Useless

talk about the most useless thread on RCTech..

for use normal folk...
more torque = better punch out of a corner..
more RPM = better straight speeds.
OBJECTIVE = for all racers Balance between both

END of thread....Moot...Moot ...Moot..
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Old 04-27-2011, 10:43 AM   #11
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Quote:
Originally Posted by olhipster1 View Post
talk about the most useless thread on RCTech..

for use normal folk...
more torque = better punch out of a corner..
more RPM = better straight speeds.

END of thread....Moot...Moot ...Moot..
Except that it is not necessarily true.

A motor with 20 oz/in of torque making 100 watts of power will have LESS punch off the corner than a motor with only 18 oz/in of torque but 150 watts of power if each is geared properly.
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Old 04-27-2011, 12:58 PM   #12
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Right again, Wingracer, making this...
Quote:
Originally Posted by olhipster1 View Post
talk about the most useless thread on RCTech..

for use normal folk...
more torque = better punch out of a corner..
more RPM = better straight speeds.
OBJECTIVE = for all racers Balance between both

END of thread....Moot...Moot ...Moot..
...about the most useless post on RCTech!!
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Old 04-27-2011, 02:28 PM   #13
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Quote:
Originally Posted by keithlaw View Post
Could anyone tell me what's the pros and cons of using an Octa Wind X12 LRP Motor compare to a non Octa Wind one?
???
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Old 04-27-2011, 03:38 PM   #14
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Quote:
Originally Posted by SlowerOne View Post
Right again, Wingracer, making this...
...about the most useless post on RCTech!!
LMAO great end to the story mate
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Old 04-27-2011, 04:16 PM   #15
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Quote:
Originally Posted by wingracer View Post
Except that it is not necessarily true.

A motor with 20 oz/in of torque making 100 watts of power will have LESS punch off the corner than a motor with only 18 oz/in of torque but 150 watts of power if each is geared properly.
useless....Internet drunkards who think they possess the ultimate in knowledge.
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