Discussions

Most efficient easystar motor?

Posted by Joel Ryan on February 20, 2010 at 1:40pm
Hey guys, I'm trying to decide what motor to purchase for my new easystar. At first I was thinking outrunner because they are generally cheaper and lighter weight. However, I want to have the most efficient setup possible to extend flight time as much as possible. I don't really care about having insane speed capabilities, or amazing climb rates, just efficiency. The easystar (for obvious reasons) needs a small prop, so why use an outrunner motor, when outrunners are meant to be high torque motors?

So bottom line, which do you think is more efficient for the easystar, outrunner or inrunner? What size would be best for just general, high efficiency cruising?

And in terms of a prop, I've heard that 7x5 props cut down to 6x5 are really good, has anyone tried this?

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Replies

  • T3
    Krzysztof Bosak February 24, 2010 at 9:58am
    One blade also means more vibration. What is balanced statically, is not necessarily balanced dynamically under load.
  • T3
    Krzysztof Bosak February 24, 2010 at 12:41am
    BTW 3-blades are better airbrakes, so might afford shorter touchdown with prop brake off.
  • Developer
    Jason Short February 23, 2010 at 10:41pm
    I've been using a LiftFlight RC ARC motor (ARC-28-37-4) with a 3 blade 6x4 prop. With a new 2100mah battery and just a radio I can get about 30 min flight time. With wind, weight, extra electronics that can go down. If you want long flight times, try slope soaring. I could fly all day on just one battery with an EZstar on the right hill.
    Jason
  • Riccardo Kuebler February 23, 2010 at 10:10pm
    Hi,

    to be a little concrete my setup for an EZ* uses a Hyperion Y22-L 2840 (mounted in a Speed400 case to fit the original motor bay), with a 3300mAh 2S lipo.
    Propeller is a Cam-Slim 5x4.

    It works well enough even in medium windy condition, say 5-7m/sec.

    Of coarse (speed) performance are not impressive, but better that the original Speed400. I think this is what you expect.

    You can see an FPV flight with it (catching by video my little son Trojan) here, and have an idea of the general flight characteristics and speed.

    Average autonomous flight time is 20', with a good reserve. Anyway there are outrunner that drive small propeller at high speed too.

    Best regards,

    Ric
  • Dennis Brown February 23, 2010 at 2:46pm
    Would a 7.2v 2S lipo setup be enough to get a fully laden UAV/FPV EasyStar into the air? A 4200 mAh 7.2v 2S battery should last considerably longer than a 4200 mAh 11.1v 3S, right? Would there be enough power to weight? I don't know. I am still purchasing all of my gear for my EasyStar UAV so I am at a crossroads as well regarding the power setup.
  • T3
    Krzysztof Bosak February 21, 2010 at 12:05am
    There are 3 things to remember:
    1. For high climb, outrunners are lighter to the power output, but needs large propeller
    2. For endurance, inrunners tend to be better, also for smaller propellers
    3. For hand launch, you use 3-4 times as much power as for horizontal flight. Therefore even moderately efficient motor is completely unreliable for hand launching.
    A conclusion is the search for 'efficient motor' are not searches for any kind of efficient motor at all, just asking 'what is your completely inefficient compromise taking into account operational conditions'

    Because the efficiency boils down to windspeed and hand toss force, the answers will vary wildly.
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