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Old Mar 12, 2005, 04:22 PM
carpe diem
didiver's Avatar
Belgium
Joined Dec 2004
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14.4V for speed 600 8.4V

Hello,
can i put 14.4V on a speed 600(8.4V)?

thanks
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Old Mar 12, 2005, 04:32 PM
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Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
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As long as you make sure your prop is small enough to limit the amp draw, and that your ESC is rated for 4s. Watch the maximum rpm too - bouncing brushes are not a good thing!

Cheers, Phil
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Old Mar 12, 2005, 04:33 PM
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North East England UK
Joined Jan 2003
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you probably could...and with a prop on it, it wouldnt last long....
Cant you reduce the cell count...or is this a lipo pack....?
even that could be reduced.
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Old Mar 12, 2005, 04:42 PM
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didiver's Avatar
Belgium
Joined Dec 2004
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ok... i will reduce... put it's not lipo but nicd...
it's actually 2 speed 600 in "parallele", so i must take good nicd to have about 50Amp..
what is the best for 50Amp?
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Old Mar 12, 2005, 06:13 PM
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Belgium
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is it dangerous to run with 14.4V for motors of 8.4V?
thanks
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Old Mar 12, 2005, 06:19 PM
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East Anglia, UK
Joined Sep 2002
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NONONO.

It will be fine on 14v. Assuming its the #3301 or #3316, and assuming its either geared, or running a small prop (6x4 or 7x5)

But you need to be more specific: There are at least 5 models of 'speed 600, 8.4v'

Race #6312
BB SP #6313
BB SP #6309
BB #3316
straight #3310

Two are possibly a bit marginal.

But the rest will do the 20k plus RPM that that sort of voltage implies no problem.
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Old Mar 12, 2005, 06:29 PM
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Belgium
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ok.. thanks.. it's #6312..race, so i continue with 14.4V.. but motors will be too hot? no?
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Old Mar 13, 2005, 05:04 AM
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East Anglia, UK
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on DD a 5,1 x4.5 prop pulls around 30A and is about the limit I'd say. In bursts! Probably over propped even then 4.1x4.1" prop maybe.

But RPM is only 28,000 or thereabouts: That is probably OK.

Best efficiency will be at somethong like 15A or so, so provided you can operate in the sub 20A region it should be OK.

3.5:1 gears and a 10x7 gives a nice sort of power on 12 cells at low 30K RPM.
(9k at the prop)

Its not a question of heat so much - more a question of wherther the brushes and armature can physically take the RPM.

The #6312 looks like a sagami with the open brush gear.

If you have a whattmeter, try it on a small prop - 4x4 or so, and spin it up slowly to see if it starts to get erratic at full power - try and keep the current under 25A - 20A if possible - and get a feel for how hot it gets.

Too hot to touch is OK, over boiling point is too far. wet finger is a good test.

If it can handle the RPM, then its just a question of limiting the current to something sane.
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Old Mar 13, 2005, 12:45 PM
717
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Vintage1,

Does your finger touch temp test apply to brushless outrunners as well?
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Old Mar 13, 2005, 05:38 PM
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East Anglia, UK
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Just about, but neodym magnets ar even more fragile than ferrites. I'd be worried about a motor that was over 100C on the case exterior with neo magnets.

I can't remember the curie point but its not a lot higher than that. Usually the glue softens and the magnete fall off anyway

Cobalt is the magnet that can stand heat. 300C or more.
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