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Jun 27, 2002, 04:39 PM
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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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Jun 27, 2002, 05:00 PM
Been There! Done That!
boomerace's Avatar
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
Jun 27, 2002, 05:34 PM
Registered User
Boomer,
Thanks for the quick response...I appreciate the help!
Jun 27, 2002, 05:41 PM
RPV builder & operator
Pierre Audette's Avatar
Same setup over here as boomer that we've been using for indoor, plus a heat sink on the motor.
Jun 27, 2002, 05:48 PM
Registered User
Bill Glover's Avatar

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 ...
Jun 27, 2002, 07:06 PM
Fuzzy Member
lupy's Avatar
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
Jun 27, 2002, 08:49 PM
MKH
MKH
Registered User
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
Jun 27, 2002, 09:11 PM
Registered User
BigBadWolf_TX's Avatar
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
Jun 28, 2002, 10:01 AM
Registered User
Everybody,

Thanks for the help with my problem...

Kyle