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Old Jun 27, 2002, 04:39 PM
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Joined Jun 2002
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Help with battery choice for MINI IFO

I have been looking at batteries for my mini ifo. I don't really want the expensive Li-Ion batts. I plan to use the GWS A drive and the stock prop (i think it's 10X7). Would a 600Mill 9.6 Volt NIMH pack be too heavy (it's 3.5 oz; 102grams)? I am most interested in the extreme vertical style aerobatics and hovering. Would a 9.6volt at 270 Milliamp NICD pack be better? It is 3.5 ounces; 102 grams, too. I also am looking at a 9.6Volt 280milliamp NIMH pack (2.7 oz; 66 grams)....Though it is lighter, it has less capacity and can't be fast charged.
Thanks for the help....

Kyle
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Old Jun 27, 2002, 05:00 PM
Been There! Done That!
boomerace's Avatar
Eugene, Oregon, United States
Joined Sep 2001
19,187 Posts
Kyle,
I can hover with 8-300ma NiMH pack.. weighs 2.2oz but it is hard on the motor. Anything with more weight will decrease your performance. Prop is a 10 X 4.7.
boomer
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Old Jun 27, 2002, 05:34 PM
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Boomer,
Thanks for the quick response...I appreciate the help!
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Old Jun 27, 2002, 05:41 PM
RPV builder & operator
Pierre Audette's Avatar
Canada, QC, Gatineau
Joined Jan 2001
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Same setup over here as boomer that we've been using for indoor, plus a heat sink on the motor.
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Old Jun 27, 2002, 05:48 PM
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Bill Glover's Avatar
United Kingdom, Bracknell
Joined Nov 2000
11,492 Posts
Re: Help with battery choice for MINI IFO

Quote:
Originally posted by Kyle
Would a 600Mill 9.6 Volt NIMH pack be too heavy (it's 3.5 oz; 102grams)?


The AUW of my Mini IFO with 9.6V pack, ready to fly, is 108 grams! That's with a 1524 motor and 50 mAh cells though.

Incidentally, you'll need to fit a rudder if you really want to hover ...
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Old Jun 27, 2002, 07:06 PM
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lupy's Avatar
Renton WA
Joined Oct 2001
824 Posts
If you are going to build up a Mini Ifo, you really owe it to yourself to get a set of the qualcom li ion's, They arn't that pricy compared to most of the packs you are talking about. Especially when you will need so many of them to match the 30 -40 min flight times. With a 10/8 you should get vertical. Then when you want to spend the $$, get a set of li poly 900's and you should be at about 4.4oz all up.

None of the small nimh cells can really put out enough juce without weighing too much, then you overload the motor and burn it out. Two qualcoms are really easy on the GWS A, even with a 10/8 prop, I have 6 months of heavy use on mine.

I have flown a mini at over 5 oz, and it's just not the same as one near 4 oz

Ken
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Old Jun 27, 2002, 08:49 PM
MKH
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Ohio
Joined Mar 2000
2,597 Posts
I like the lithium polys that Dan sells, but yes, they are pricey. It has good vertical, but that's not really what I care about, and the IFO is too much fun to toss around, to waste time in long straight climbs. BTW, a 2 cell lionpoly 930mah pack, GWS rx, 2 Pico servos, P7 esc, GWS-A drive, GWS prop, and Azarr antennae weighs a total of 3.5 ounces. Add your airframe and covering to that, and it doesn't take much thrust to go straight up. I'm going to try Lupy's 10x8 suggestion, to compare with the 10x4.7.
Marcus
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Old Jun 27, 2002, 09:11 PM
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BigBadWolf_TX's Avatar
Mineral Wells TX
Joined Jan 2001
65 Posts
I just finished my Mini IFO. I am using a GWS A drive with a 10X4.7 prop. My batteries of choice are currently 8 cell 280mah NIMH's, and I run with a heatsink. They will pull the mini vertical, and I have some extra weight to lug around. I am using three servos (controllable rudder), built up carbon landing gear, and ripstop covering. Hope this helps.

I want to use lithiums, but am going to wait till I can find some a little cheaper. Any suggestions?

Mike
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Old Jun 28, 2002, 10:01 AM
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Joined Jun 2002
4 Posts
Everybody,

Thanks for the help with my problem...

Kyle
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