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Battery?

Posted by Teque5 on May 21, 2009 at 11:00pm
I have a narrowed down parts list, but am at a loss for a battery. I don't have much experience w/RC planes.

What should i get to enable this setup to get the longest flight time possible. (2hrs?)Total without battery comes to $680. This list is in a more complete form here.This will be my first RC, but not my first robot.
Tags: battery, build, list, parts, uav
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Comments

  • Joseph Glanville May 22, 2009 at 8:03pm
    Aye, you will be hard pushed for 2hrs endurance out of an easyglider..
    You are looking at a battery with wings and a motor attached lol.
    Matt sounds about right though, grab yourself a small brushless motor and a 3s pack, then run it across a shunt to figure out the current draw of the motor at cruise throttle. You can use that to figure out the endurance of the motor battery.
    As for the other electronics their draws are usually available on their datasheets.
    Goodluck. :)
  • Matt May 22, 2009 at 1:26am
    I would guess that a small brushless with a 3s 2200mah lipo will get you 25-35 minutes in the air with cruise throttle. So that's a current draw between say 3.5 and 5 amp/h. That's before adding the extra weight of video gear. I also don't know if that glider can cope with a large 5amp battery for those longer flights.
    I will be testing that set-up in the next week or so but with a 4400mah 3s 11.1v lipo batt.
  • Moderator
    Gary Mortimer May 22, 2009 at 12:45am
    Well gooooooooooo brushless first and then look at it seriously, you certainly need to separate flight power from downlink. Also note flights greater than 30 minutes will require Notams in the future. So you might want to make 29 minutes your flight time ;-)
  • Sarel P. Wagner May 22, 2009 at 12:30am
    I think the best way is to rip out a calculator and the spec sheets or a current probe and measure the consumption for each of these parts. Then add all the currents up and do the math to see what power budget you have. Then you will know what the current draw down is and you can select your battery after that.

    LiPo technology is the best power density we currently have that is workable.

    Rgrds
  • Teque5 May 21, 2009 at 11:56pm
    noooooooooooo -> what kind of lipo exactly. thats the point of my inquiry...
  • Moderator
    Gary Mortimer May 21, 2009 at 11:52pm
    I think you will struggle to get 2 hours out of an easy glider, especially in a brushed fit, right away you need to go brushless.

    So its lipos for you!!

    Also separate flight battery from video/downlink. So thats two lipos.

    Good luck
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