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Electric Flight Discuss Electric Flight in Canada

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Old 09-22-2007, 08:21 PM   #11
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You should take careful note that that 45A rating is for 30s, not continuous... try and push 40+ amps through that motor for longer, and you're liable to smoke the windings.

One of the joys of the cheap offshore brushless motors is the sometimes overly-optimistic specs that go with them. I'd try and keep the load on that motor to about 30A, just to be safe. That also reduces the strain on your battery to about 13C.

Also, I've been using free motor calculator program: It's pretty straightforward, lets you add your own motor observations easily, and the power calculations have been pretty accurate. Combine the info from that with the usage scale from CommonSenseRC, and you're away to the races:

Eagles may soar,
but weasels don't get sucked into jet engines.
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Old 09-22-2007, 10:04 PM   #12
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Once you get up to the 3 Lb size, I'd take a good hard look at the DeWalt batt packs (search DC9360 on Ebay). You can beat the snot out of them at 30C (~70A or so) , and they'll keep coming back for more.

The down side is that the voltage is lower, and the cells are heavier than LiPO.

The upside is that they *last* much longer than Lipo packs, and you can charge them in 20 minutes or so.

Go over to , and ask your questioin there. The advice you will get is world-wide, as opposed to just the Canuck view.
Mine is not to reason why; I just wire them up to fry...I mean Fly!
I don't suffer from insanity...I enjoy every minute of it!!!
I never claimed to be the sharpest knife in the chandelier......

Brad Kacer
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Old 09-22-2007, 10:39 PM   #13
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Thanks again,
The upside of all this is I'am learning alot...
As for the off shore stuff, for what I'm doing, flying plastic around,
I really don't want to much money into the thing,

The fun thing will be playing around with different props so I can get good flight performance and running the motor so it does draw at the 10 C ish range. This could be hard but hay, beats sitting at work.

Later John
Bring it on!!! If your man enough....
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