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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › battery size and type
10-16-2005 11:43 PM  12 years agoPost 1
ket

rrVeteran

ohio hill country

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got the new hawk pro , went with os 37. hitec hs-475hb's. , will be useing fitaba 401 with servo that come with for tail. what battery is needed .. size and type... 4.8 or 6 v. Mah size nicad ... lipo?

thanks ket

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10-17-2005 02:37 AM  12 years agoPost 2
BC Don

rrElite Veteran

Calgary, AB Canada

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Stay with 4.8. I don't believe that the 401 likes 6V. I fly with 1200 to 1400Mah Rx (can't remember which). These'll last for 6 flights OK (running the 401 with a 9254 and 4*3151 digital servos). These "regular double A size" batteries give me a good balance point. If you go to the larger sub 'C' size you'll get more MAh but they'll weigh more.

If you want to explore LiPos and a votage regulator, again be careful about the output and, you may need to move some things forward to get your CG under the main rotor shaft. I wouldn't go with NiMh at this time either. NiCds seem to work well. If you are flying more than the 1/2 dozen flights then buy 2 batteries and swap at the field, they aren't that expensive.

In any case, make sure you check your Rx batteries before flying with a load on them to make sure they are OK.

Got Money? Send it to me, I'm a Heli Addict.

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10-17-2005 03:11 AM  12 years agoPost 3
ket

rrVeteran

ohio hill country

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what are the best shapes
to buy for hawk pro, and anyone got good link to purchase batteries

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10-19-2005 07:42 PM  12 years agoPost 4
Doug C

rrApprentice

Northern CA

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I am using a 4 cell 3000mah pack from Batteries America, works great gives me enough charge time for 5-6 flights on my Hawk Sport

had to go to the bigger pack as the gyro and 9253 servo drained the 1400ma after 3 flights, and the gyro is not happy with low voltage---> goes nuts.

I would suggest to use 6v pack with a 5.4v regulater if you are running digital servos ( that is what I am using on my Pmax 90 (9C PCM w/ full digital servos)

you mount the VR between the switch and the receiver, that keeps the main voltage at 5.4 then tracks the pack as it drops below 5.4. the 401 is happy with that arrangement

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10-19-2005 07:59 PM  12 years agoPost 5
SRH990

rrKey Veteran

Birmingham, UK

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I've got a flat pack of 4 2300mAh AA cell Nimh's on the tray at the front with the receiver ontop. As others have said, the 401 doesn't like 6v, neither does the 9254 servo that comes with it.

I use a 2 cell lipo pack with regulator on my Raptor. the regulator is between the switch as Doug C says, this is also where the low volt warning device is as it would be permanently on if it was before the switch

Before using a lipo pack I checked out the current requirements using an electric flight meter. I have JR 811's on cyclic, throttle & pitch with a 401 gyro and 9254 servo. By stalling 3 servo's the maximum current requirement was 2.8A, less than I was expecting. A 10 minute flight uses about 400mA out of the lipo. The Nimh pack I'm using in the Hawk isn't a lot lighter than the lipo setup, I only used the lipo because I have a few around and I'm not using 2 cell packs for anything else

Steve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4

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