Search: Posts Made By: kyleservicetech
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Forum: Power Systems
01-13-2010, 03:56 PM
Replies: 43
Views: 16,354
Posted By kyleservicetech

These are all good points! That's why increasing...

These are all good points! That's why increasing your batteries cell count by one cell can go from an underpowered dog, to a situation where the motor/batteries/ESC can burn up.

One thing that...
Forum: Power Systems
01-06-2010, 03:58 AM
Replies: 43
Views: 16,354
Posted By kyleservicetech

Seven pounds at 425 watts? I'd be reluctant to...

Seven pounds at 425 watts? I'd be reluctant to fly it off of grass.
Forum: Power Systems
01-06-2010, 03:44 AM
Replies: 43
Views: 16,354
Posted By kyleservicetech

Uh Oh I've never done that, comparing the KV...

Uh Oh
I've never done that, comparing the KV rating of the motor with the battery voltage, and the RPM the motor turns over.

I believe the KV rating is determined by turning the motor over at a...
Forum: Power Systems
01-06-2010, 03:30 AM
Replies: 43
Views: 16,354
Posted By kyleservicetech

Those wattmeters are connected in between your...

Those wattmeters are connected in between your battery and the ESC.

Back in the brush type motor days, you could easily measure the voltage at the battery pack, and also at the brushes of the...
Forum: Power Systems
01-06-2010, 02:43 AM
Replies: 43
Views: 16,354
Posted By kyleservicetech

Good point! :cool: My A123 cells run...

Good point! :cool:

My A123 cells run about 3 volts per cell at about 30 amps load, and those Lipos usually run about 20% higher than that.
Forum: Power Systems
01-06-2010, 02:40 AM
Replies: 43
Views: 16,354
Posted By kyleservicetech

You've got to watch the "prop blast" MPH from...

You've got to watch the "prop blast" MPH from that prop. In theory, you could put a propeller with 24 inch diameter, and one inch pitch. It would pull roughly the same amount of watts from that...
Forum: Power Systems
01-05-2010, 05:35 PM
Replies: 43
Views: 16,354
Posted By kyleservicetech

Yeah, 99.9% of the time a light bulb will...

Yeah, 99.9% of the time a light bulb will probably work just fine, but you've always got the guy in the back of the room that had problems using an optical tach with those bulbs.

I suspect that...
Forum: Power Systems
01-05-2010, 01:52 AM
Replies: 43
Views: 16,354
Posted By kyleservicetech

Same setup I use, but place my flashlight on any...

Same setup I use, but place my flashlight on any nearby box. FYI, if you want a really high powered flashlight, check out the two type "D" cell three watt LED type "Maglite" made in Ontario CA.
...
Forum: Power Systems
01-04-2010, 11:31 PM
Replies: 43
Views: 16,354
Posted By kyleservicetech

Yeah, I go back 50 years to the days of vacuum...

Yeah, I go back 50 years to the days of vacuum tubes and thyratrons, and transistor radios that cost a weeks wages. :censor: Now, its microprocessors, microcontrollers, digital circuits, high powered...
Forum: Power Systems
01-04-2010, 09:38 PM
Replies: 43
Views: 16,354
Posted By kyleservicetech

Depends on the tach you have, one of my older...

Depends on the tach you have, one of my older ones picked up the ripple illumination from a 150 watt incandescant light bulb while trying to measure prop speed in my workshop.
Forum: Power Systems
01-04-2010, 06:56 PM
Replies: 43
Views: 16,354
Posted By kyleservicetech

Agreed: As you indicate, the blade pitch and...

Agreed:
As you indicate, the blade pitch and RPM are important, as they are directly related to how fast your model will fly, given enough power.

I'm using a Hacker A50-16S on 6S2P A123 cells,...
Forum: Power Systems
01-04-2010, 03:55 AM
Replies: 43
Views: 16,354
Posted By kyleservicetech

Bottom line, RPM is interesting, but not the...

Bottom line, RPM is interesting, but not the total answer. Depending on the model you are trying to fly, a motor that turns a 16 inch propeller at 6000 RPM could out perform a motor that turns a 14...
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