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Maiden Flight Today!

Old 03-20-2016, 10:54 PM
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kyleservicetech
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Default Maiden Flight Today!

I've been building up a Peak Models 95 inch wingspan Edge model for electric power. The power system is a Rimfire 50 cc motor, 12S3P 7500 Mah A123 and a 22X10 prop.

To avoid multiple postings, take a look at my thread in RCGroups.

http://www.rcgroups.com/forums/showt...6#post34310707
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Old 03-21-2016, 12:49 AM
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birdDog
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That's a heck of a plane Denny. Now you got me thinking A123... Sweet looking standoffs. If I had a lathe here I would probably never go to work again. As for the earlier Lipo question, I second the Zippy branded lipos. Have a couple 4s 5000mAh that are 5 seasons old. They require me to trim a flight time down from 6.5 minutes with the fresh ones to 5.5 with the old ones, 3.8ish vpc. Nice batteries.

Glad it went up and came back without a hitch.
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Old 03-21-2016, 01:53 AM
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kyleservicetech
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Originally Posted by birdDog View Post
That's a heck of a plane Denny. Now you got me thinking A123....
A123's

For the bad news, they only come in one size, 2500 Mah, their voltage is 2.8 Volts at 40 Amps, they are physically larger, they are 1/3 more weight for the same watt hour capacity as compared to LiPos.

Because of their single sized cell and their weight, they don't work well with foamie models, unless the model is perhaps over 500 Watts or so.

For the good news. No worries about storage voltage. Just top them off at the end of the day and they are ready to go next day, next week, next month - - -

If purchased from an authorized A123 distributer, they measure within a percent or two of each other, both in Amp Hours, and voltage under load. They last a long long time, and even after 5 years and 500 flights, will still turn the same prop at the same RPM. (Personal experience from 140 of those A123's in my various models)

They have no fire hazard in that they can not become flaming blow torches like an abused LiPo. You can run them down to 2.0 Volts per cell, per factory specifications. But after they drop below 2.7 Volts at 40 Amps, they are totally discharged.

Trade offs trade offs.
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