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Himax 2025/4200 w/ 35A ESC

Old 07-19-2005, 07:35 AM
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JDBuddy
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Default Himax 2025/4200 w/ 35A ESC

I recently purchased a GWS Formosa. The plane flys with the stock motor, but I want some real preformance ( I fly glow planes and tend to overpower them). So, I have ordered a Himax 2025/4200 with a CC Phoenix 35A esc. I went ahead and purchased a 750 mah 3 cell 11.1 v lipo battery to use. Did I make a mistake getting the 35A controller (I see most posts indicate the 25A controller being used with the 2025)? Will this cause problems for the motor with an 11.1v lipo?

Thanks,

John
Old 07-19-2005, 08:33 AM
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Matt Kirsch
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Default RE: Himax 2025/4200 w/ 35A ESC

The problem won't be with the ESC. Bigger is perfectly fine, and will cause no problems from an operational standpoint. The only drawback is if you're weight conscious. Bigger is heavier too

Your problem will be with that battery pack. 730mAh, assuming that it's a typical 10C pack, only gives you 7.3 Amps of capacity. If you drop that 2025 into the stock gearbox, you'll be drawing somewhere in the 15-20 Amp range, depending on prop size. The result? One ruined battery pack. If you reduce prop size to satisfy the battery's limitations, you won't be overpowered anymore.

A higher-capacity battery pack is in order, something like a Thunder Power 2100, or maybe a Kokam 1250 (15C). The Kokam will be about 2oz lighter.
Old 07-19-2005, 12:00 PM
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JDBuddy
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Default RE: Himax 2025/4200 w/ 35A ESC

Matt,

Thanks for the advice. I will look for a higher capicity battery. Here is the specs on the battery that I have:
Thunder Power 730 11.1v Li-poly Pack
• Size: 34mm x 50mm x 14mm
• Weight: 45 grams
• Rating: 10-12C Continuous discharge, 16C Burst (75watt class)
Do you think that I can use this for short flights, making sure that the lvc on the esc is set to save the 5.0v?

Thanks
Old 07-19-2005, 12:27 PM
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cadconversions
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Default RE: Himax 2025/4200 w/ 35A ESC

JD, the LVC must be set at 9.0v for the 3s packs and 6.0v for the 2s packs. You will ruin this battery pack even trying to use it for a little while due to the current the setup is wanting to pull. I like the apogee batteries and the 2170 or 2480 is a great pack. You'll like this motor but only if you have the batteries to support it's thirst for power.
Old 07-28-2005, 09:02 AM
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Default RE: Himax 2025/4200 w/ 35A ESC

OK

You guys were right. The set up need the Thunder Power 2100. Now the plane flys great. My problem was that I thought the Mah rating of a battery pack only indicated how much energy the battery could store. I didn't realize that the Mah also indicated the amount of energy that the battery could send out. Now I think I get it.

So....
with a draw of 15A on the Himax 2025 with a 9X6 prop
11.1 v on the 3 cell Lipo
15 X 11.1 = 166 Watts
125 Watts per lbs. needed for sport flying
166/125 = 1.33 lbs or 21 oz
Since my Formosa is about 17 oz flying weight it now has the power it needed.

Thanks again.

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