Search: Posts Made By: alaursen
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Forum: Power Systems
01-06-2010, 04:31 AM
Replies: 43
Views: 16,354
Posted By alaursen

I measure volts and current (clamp-on) separately...

I measure volts and current (clamp-on) separately so can easily compute watts. I'm new to powered flight - thanks for the input on the Tele. I just put at least 80 hours building it over the last 4...
Forum: Power Systems
01-06-2010, 04:14 AM
Replies: 43
Views: 16,354
Posted By alaursen

It is a paved field (SCCMAS.ORG). However, the...

It is a paved field (SCCMAS.ORG). However, the motor is rated for more than twice that. Again, what gives with the Hobby-Lobby reco? Seems like 3S LiPo is at the very bottom of the performance range.
Forum: Power Systems
01-06-2010, 03:53 AM
Replies: 43
Views: 16,354
Posted By alaursen

OK due to the excellent input from this thread, I...

OK due to the excellent input from this thread, I will assume the power is close to battery voltage (ESC input) times the measured current. The RPM cannot predict motor voltage when loaded with a...
Forum: Power Systems
01-06-2010, 03:36 AM
Replies: 43
Views: 16,354
Posted By alaursen

I understand your point about 3 phase versus DC...

I understand your point about 3 phase versus DC and large voltage drops (power or heat = V X A). However, what do you think about the KV versus RPM? Assuming I am measuring accurately with the tach...
Forum: Power Systems
01-06-2010, 03:18 AM
Replies: 43
Views: 16,354
Posted By alaursen

Hmm, I take it you mean underpowered. If so, I...

Hmm, I take it you mean underpowered. If so, I wonder why HL has this recommendation posted on the box for the Telemaster. Unless my power calcs are way off. Even if I use the best case 3S voltage of...
Forum: Power Systems
01-06-2010, 03:08 AM
Replies: 43
Views: 16,354
Posted By alaursen

It may seem low, but if the manufacturer says the...

It may seem low, but if the manufacturer says the KV=800 and my measured RPM = 7300, doesn't that mean the motor must be "seeing" 9.1 volts? Maybe I don't understand KV correctly, however, one thing...
Forum: Power Systems
01-06-2010, 03:03 AM
Replies: 43
Views: 16,354
Posted By alaursen

Thanks Kyleservicetech, My battery voltage...

Thanks Kyleservicetech,

My battery voltage to the ESC IS 3S = 11.1 volts. However, the motor obviously does not see this due to drops in the ESC and wiring, which can be significant at 40 A. I...
Forum: Power Systems
01-06-2010, 02:15 AM
Replies: 43
Views: 16,354
Posted By alaursen

I just bought the GlowBee tach today for $28...

I just bought the GlowBee tach today for $28 cause I was in a hurry to measure my Telemaster 40 setup which I'm almost ready to fly (just need to cover it). I found the tach picked up the 3600...
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