Search: Posts Made By: kyleservicetech
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Forum: Power Systems
05-30-2012, 07:46 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

That says it all! For those that need to...

That says it all!

For those that need to measure very high currents, check out the Sears Craftman #82369 AC and DC clamp on ammeter. Not cheap at about $60, but it will measure up to 400 Amps DC....
Forum: Power Systems
05-30-2012, 02:21 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

You've really got to watch the prop size with...

You've really got to watch the prop size with these electric motor power systems. These motors are pretty much constant RPM power plants, as compared to a glow engines constant torque type power...
Forum: Power Systems
05-29-2012, 05:40 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

What's the wingspan, wing area, and weight...

What's the wingspan, wing area, and weight without motor/ESC/battery?

One of those programs such as www.motocalc.com (http://www.motocalc.com) will be of considerable assistance in your power...
Forum: Power Systems
02-19-2012, 07:47 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Don't know if its true or not, but rumors are...

Don't know if its true or not, but rumors are that these A123 batteries have already been counterfieted.

Best prices I've found was about $8.50 direct from China on eBay.
Forum: Power Systems
02-19-2012, 02:19 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Agreed: Only problem with that "90C" rating...

Agreed:

Only problem with that "90C" rating is Flying Time is FT = 60 Minutes/C, so that's 60 minutes/90C. That is 40 seconds flying time at full power, if that 90C rating is anywhere close to...
Forum: Power Systems
02-19-2012, 01:53 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Probably right. On the other hand, it's difficult...

Probably right. On the other hand, it's difficult to find ANYONE that has actually worn out an A123 battery pack. I've got several 6S2P A123 packs with 300 plus flights on them. By actual discharge...
Forum: Power Systems
02-18-2012, 10:35 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Those A123 cells are rated for 30C, but actually...

Those A123 cells are rated for 30C, but actually using them at that "C" rating results in their voltage dropping off a fair amount. Generally around 2.8 volts per cell or so. Again, LiPo is better....
Forum: Power Systems
02-18-2012, 07:42 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Yup, they are heavier than LiPo batteries. From...

Yup, they are heavier than LiPo batteries. From what I've found, they are about 30% more weight than an equivalent LiPo with the same watt hour performance.

Problem is, they only come in one...
Forum: Power Systems
02-17-2012, 06:33 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

LOL I've been building up my A123 packs as 6S2P...

LOL
I've been building up my A123 packs as 6S2P for over 4 years now. The shrink wrap used is a plastic flavered water bottle from the local grocery store with about a 10 inch circumference. Just...
Forum: Power Systems
06-07-2011, 12:55 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Yup Take a look: Thread on 70 size glow...

Yup
Take a look:
Thread on 70 size glow engine conversion to electric<O:p></O:p>
http://www.wattflyer.com/forums/showthread.php?t=45222 (http://www.wattflyer.com/forums/showthread.php?t=45222)
...
Forum: Power Systems
05-15-2011, 11:27 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Agreed: If you're flying an electric with Lipo...

Agreed:
If you're flying an electric with Lipo cells, you just build the model (or assemble the model!), and go out and find an appropriate sized Lipo battery and motor.

If you're flying with...
Forum: Power Systems
05-15-2011, 10:07 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Don't know what this stuff is, but the "all...

Don't know what this stuff is, but the "all purpose flux" for $5.55 allowed instant "tinning" of the A123 cells with solder, using a Weller 100 Watt temperature regulated soldering iron. After...
Forum: Power Systems
05-15-2011, 06:03 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

I did try running these A123 cells without...

I did try running these A123 cells without soldering them in, but ran into problems with high contact resistance between cells. Could just be the cells I bought direct from China, don't know. They...
Forum: Power Systems
05-14-2011, 11:48 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

And if you should "Accidentally" bend up your...

And if you should "Accidentally" bend up your model, you've got a dry piece of balsa/plywood to fix. No worries about fuel soaked wood, no nothing. And, again, no vibration shaking your radio and...
Forum: Power Systems
05-14-2011, 11:25 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Funny you should ask. :D Take a look: Thread on...

Funny you should ask. :D Take a look:
Thread on 70 size glow engine conversion to electric<O:p></O:p>
http://www.wattflyer.com/forums/showthread.php?t=45222...
Forum: Power Systems
09-20-2010, 11:31 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Yep, you need more Milliampere Hours. FYI,...

Yep, you need more Milliampere Hours.

FYI, if you divide 60 minutes by the value of "C", that will tell you how long it will last. So, if you have a discharge rate of 30C, 60 minutes divided by...
Forum: Power Systems
08-28-2010, 07:48 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Hi Mark I've been using it now for several...

Hi Mark
I've been using it now for several years, its usually pretty close to the real world.

I've even made up "Phony" electric motors and battery packs to match the performance of a model...
Forum: Power Systems
08-28-2010, 03:10 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Not familiar with drivecalc, but am familiar with...

Not familiar with drivecalc, but am familiar with www.motocalc.com (http://www.motocalc.com). This program is free for 30 days, after that, it's $39.00. If you are limited to a 8X4 prop, motocalc...
Forum: Power Systems
03-08-2010, 05:21 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

And on and on and on. No vibration to mess up...

And on and on and on. No vibration to mess up your radio, no glow fuel affecting your glue joints, no noise to affect your flying field - - - .

One of our club members enjoys 90 sized glow...
Forum: Power Systems
03-08-2010, 01:54 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Absolutely agree. These electric motors are kind...

Absolutely agree. These electric motors are kind of a "Constant RPM" power plants, where those glow engines are kind of a "Constant Torque" power plant.

What does that mean? One thing comes to...
Forum: Power Systems
03-07-2010, 05:36 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Good way to phrase this! These higher...

Good way to phrase this!

These higher quality electric motors have rather surprising amounts of power. Example, my Hacker A50-12S motor outperforms a four stroke glow 70 size engine. Not many 4...
Forum: Power Systems
03-07-2010, 04:43 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

That might be something I started awhile back....

That might be something I started awhile back. Any electric motor that is running over 100 watts per ounce of motor weight IMHO might be pushing the motor windings rather hard.

One of my models...
Forum: Power Systems
10-05-2009, 06:46 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

You can use an ESC with just about any ampere...

You can use an ESC with just about any ampere rating that is higher than your MOTOR will pull under load. The current pulled out of your battery is set by your motor and its prop, not the ESC itself....
Forum: Power Systems
09-19-2009, 03:40 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

As AEAJR points out in posting #155, even a small...

As AEAJR points out in posting #155, even a small change in propeller can make a MAJOR difference in the Amps and Watts pulled by a motor. What could seem to be a small change in propeller can make...
Forum: Power Systems
09-18-2009, 05:02 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

???

Your battery is a three cell LiPo, so it should be around 11.1 volts or so, not 12.5. Did you measure your setup with an Astroflight Whattmeter, or similar device? Or did you use separate readings...
Forum: Power Systems
09-18-2009, 04:08 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Confused? Looks like both web pages show...

Confused?

Looks like both web pages show the motor?
Forum: Power Systems
09-18-2009, 02:18 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Which battery? 175 Watts/14 Amps = 12.5...

Which battery?

175 Watts/14 Amps = 12.5 Volts. Divide 12.5 by 3 cells equals 4.16 volts, I think that is a little high for a Lipo??

But if its four A123 cells, they have a lower voltage,...
Forum: Power Systems
09-17-2009, 01:57 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Take a look at my following thread: ...

Take a look at my following thread:
http://www.wattflyer.com/forums/showthread.php?t=45222


If you are going the Lipo route or smaller models, I'm the wrong guy to ask for double checking, got...
Forum: Power Systems
09-16-2009, 05:09 PM
Replies: 324
Views: 131,384
Posted By kyleservicetech

Volts???

The volts issue is covered in the first few pages of my PDF file per below.

http://www.wattflyer.com/forums/showthread.php?t=45173 (http://www.wattflyer.com/forums/showthread.php?t=45173)

You...
Forum: Power Systems
09-16-2009, 12:34 AM
Replies: 324
Views: 131,384
Posted By kyleservicetech

That's it! Your 1000 mah battery has 1000...

That's it! Your 1000 mah battery has 1000 mah/1000 or 1 Ampere Hour. And that 20C rating indicates the maximum current you can pull out of that 1 ah battery is 20 Amps, typical values for a "Foamie"...
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