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  1. #1

    Wattage ultimate biplane brushless conversion

    I need some help selecting a brushless motor ,esc, prop and lipos for a wattage ultimate bipe. Looking for some low budget options. Looks like a nice little plane that's built up covered and not made out foam. I have a hackerA20-20L and himaxx 2815-4000 available.I am not opposed to using a gearbox with the himaxx.
    Last edited by Mark@ny; 03-13-2014 at 09:04 AM.

  2. #2

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    The plane is around 32oz so the Himaxx is well suited for good aerobatic performance at close to 150W/lb...., since it is rated for 275W (86g @ 3W/g is close enough) .......(the 57g Hacker can't manage that). Determine the correct prop size then gear accordingly... at around 4:1 gearing you'd have a Kv of ~1000Kv which should allow 10"-12" props, while keeping the amp draw at ~ 25A.
    Dr Phil Millener, Chattanooga, TN

  3. #3
    Thanks for the info, I could use a little more info. What company gearbox? What amp ESC ? The plane was originally designed for a 7x4 prop. 10" I think is the max that could fit. I have a 25 amp brushless speed controller to use if possible. I am not looking for 3-D performance just good spirited flight.

  4. #4

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    Why don't we go with your 25A ESC and an 8x4 APC E: I'm guessing your motor would fit a GWS 400-style gearbox. One can get several different ratios. http://www.allerc.com/hyperion-alumi...v2-p-1579.html

    ~260W is still ~130W/lb.. should be plenty.

    Motor: HiMaxx HA2815-4000; 4317rpm/V; 4.2A no-load; 0.016 Ohms.
    Battery: Thunder Power TP4400 (G4 ProPower 45C) (45C); 3 cells; 4400mAh @ 3.7V; 0.002 Ohms/cell.
    Speed Control: Castle Creations Phoenix 25; 0.0065 Ohms; High rate.
    Drive System: Geared; 8x4 (Pconst=1.47; Tconst=1) geared 3.6:1 (Eff=80%).
    Airframe: Anything you want.
    Motor Amps = 24.7
    Motor Volts = 10.8
    Input (W) = 266.4
    Motor RPM = 44502
    Prop RPM = 12362
    Thrust (oz) = 31.5
    PSpd (mph) = 46.8
    Last edited by Dr Kiwi; 03-13-2014 at 11:56 AM.
    Dr Phil Millener, Chattanooga, TN

  5. #5
    Is a 4400 mah pack necessary ? I have a 2100 mah pack from another plane don't remember the C rating. I would like to know a possible outrunner recommendation as well. Thanks for the help.
    Last edited by Mark@ny; 03-13-2014 at 04:26 PM.

  6. #6

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    Oh heck... sorry... that battery was just in MotoCalc and I didn't correct for what you actually need! ANY battery which can deliver ~25A will do (1000mAh/30C... 2000mAh/15C... etc... would do)....... mAh capacity will simply determine flight time.
    Dr Phil Millener, Chattanooga, TN

  7. #7
    I think a outrunner might be an easier choice since I can't locate a gear box that will fit a 2815-4000 due to its 28mm outside diameter.

  8. #8

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    This should work for a 28mm OD motor. http://www.allerc.com/hyperion-alumi...v2-p-1579.html
    Dr Phil Millener, Chattanooga, TN

  9. #9
    The gearbox from allerc.com I don't think will work. Besides the o.d. of the can being 28mm not 20mm,the shaft size is much larger than the pinion available I am willing to save the himax for something else. But I would like a recommendation for an outrunner but possibly still using the 25amp speed controller I currently have. Maybe something from hobbyking or BPhobbies.
    I tried to contact himax since they offer the 2815-4000 witha gearbox to see if it was available separately but they did not respond.

  10. #10

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    I think that a 28mm OD motor would fit, but, yes, you'd need 3.2mm pinions.

    Here is an Exceed 2220 motor (28mm OD) in a similar gearbox.

    Click image for larger version. 

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    Last edited by Dr Kiwi; 03-18-2014 at 09:09 AM.
    Dr Phil Millener, Chattanooga, TN

  11. #11
    The pinion shaft is 4mm. Do I still use a 3.2mm pinion and press it on or is there other mods to be made. Thanks for the help.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  12. #12

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    My mistake.. I looked up Himaxx 2815 and their chart said 3.2mm for the three lower Kv versions... but I missed the fact that the -4000 is 4mm!! http://www.rcdude.com/servlet/the-49...nrunner/Detail


    I don't even know whether 4mm pinions are available.
    Last edited by Dr Kiwi; 03-18-2014 at 02:28 PM.
    Dr Phil Millener, Chattanooga, TN

  13. #13
    Moderator aeajr's Avatar
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    I find the electrifly calculators work well to help define a motor or specs to use to go shopping
    http://www.electrifly.com/powersyste...tem-index.html

    I have had very good experience with Rimfire motors.
    Long Island Silent Flyers
    www.lisf.org
    Eastern Soaring League
    www.flyesl.com

  14. #14
    Thanks for the response. Since writing last I was given a HK 2040 4800kv inrunner I have an e flight 6.6 to 1 gearbox . Is this a usable combo with a 25amp speed controller ? What prop?

  15. #15

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    At a guess I'd say about 12x6 on 3s would draw ~20A.

    I'd certainly start with no more than 10" with my Wattmeter in hand!
    Last edited by Dr Kiwi; 03-26-2014 at 02:02 PM.
    Dr Phil Millener, Chattanooga, TN


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