Parkflyers International Design and Build Log: Curtiss P-40 Warhawk

Discussion in 'Scratchbuilding!' started by bimoadiprakoso, Apr 19, 2017.

  1. bimoadiprakoso

    bimoadiprakoso Top Gun

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    Ratatatata!!

    Love the low passes, BB56! Welldone!

    Parkflyers International Parkjets

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  2. csitas

    csitas Ace Pilot

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    Man, them old timers really know how it's done . Congrats Boggie.
    cool build and a superb fight.
     
  3. bogusbandit56

    bogusbandit56 Top Gun

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    Thanks csitas I really had some fun with the low passes.
    Hopefully when I get some more paint on the old gal she will look better
     
  4. bogusbandit56

    bogusbandit56 Top Gun

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    I was loving it too:D
    you must find time to build one.
    I will have a go at lowering the battery to see if she will roll better.
    I think the motor I have will swing a 12 x6 prop, so I am loosing some thrust with the 11x 4.7.
    With an 11x9x3 it should produce 1200gram of thrust.
     
  5. bimoadiprakoso

    bimoadiprakoso Top Gun

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    I will try to get 1800KV motor as I have 7x4 prop. Hopefully I could build it soon at 100% scale. 120% seems to be quite big for me. But, I will follow your design on the wing, using under camber tips.

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  6. bogusbandit56

    bogusbandit56 Top Gun

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    If you build at 100% a standard parkjet motor will do I think.
    It is very similar to the L-3 wing and really works well.
     
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  7. bimoadiprakoso

    bimoadiprakoso Top Gun

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  8. Well it's about time Ian, I have already built 2 of them. :D :D WELL DONE. With the under cambered wing it floats like a butterfly . Mine has pretty good speed with the 1200kv NTM motor and a 10x5 APC prop, I know I could throw more at it and make it really rock but it's fun to fly as is. The roll on mine is slow also but it is also slow on the Ft spitfire and that's with the battery level with the wing. I would just try adjust the throw to max before lowering the battery.

    Bimo at a 100% build your little 2700kv motors and your 6X4X3 prop will go like a rocket.

    Cheers
    Jeff
     
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  9. I have a few of those Gemfan props, you can have them. If you want any kind of speed use a rigid prop. I bet you would have more speed with a 10X5 APC prop using the existing motor.
     
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  10. EricR

    EricR Ace Pilot

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    Beautiful plane and flying. The Landing was super smooth as well! Congratulations!
     
  11. bogusbandit56

    bogusbandit56 Top Gun

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    The motor only spins @900kva and the props are designed for the motor just the wrong type of prop:)
     
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  12. For slow flying great but when I see the tips of the prop touch each other that doesn't equal speed. :D :D
     
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  13. bogusbandit56

    bogusbandit56 Top Gun

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    Thanks Eric, I wish I had the skill to paint my planes like some of the other builders.
    I have daubed some more paint on which may or may not be brown, it looks very red to me but never mind, once the sharks chops and spinner are on it will look more authentic. Possibly.
    It does fly very well, which is the most important thing for me:)
     
    Last edited: May 11, 2017
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  14. She is going to be a great cruiser and a go to plane for fun flying. :)
     
  15. bogusbandit56

    bogusbandit56 Top Gun

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    Slow motors spin larger props which means more torque, so for a warbird like this a 3 blade 11x9x3 would be great. Hobo King say that some of their warbirds have this motor so I am obviously under propped.
    I doesn`t really matter, what was important is that the plane flew very well and I enjoyed myself immensely. :) In fact I am going out this evening to have another go if the wind drops.
     
  16. Flybyknight22

    Flybyknight22 Top Gun

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    BB56,

    "If" I wanted more power and speed and,..

    "if" I were to build the P-40 at the 120-125% scale that you and Jeff did I would consider this motor.

    https://hobbyking.com/en_us/ntm-prop-drive-series-35-36a-1800kv-875w-2.html

    It is the strongest motor I have bench tested to date. Those results and video are in Scott's Parkjet motor test thread.

    It runs on 3 or 4- cell up to 70 amps.

    It can swing a 10 or 11 inch prop.

    On a bench test it produced 63 ounces or 1.8kg of thrust with just an 8 inch prop and on 3-cell battery.

    Very very powerful motor for planes the size you guys are flying.

    The NTM version is no longer available but the PropDrive series has the same specs.

    Turnigy bench test info:

    8x3.8 SFP Pusher APC

    ESC Auto timing

    3-cell 40C 2200mah battery

    63oz thrust WOT burst, 60-58oz constant

    29-30oz thrust 1/2 throttle

    60amps [email protected]

    17.5amps 220watts @1/2 throttle

    At WOT it was not at max current draw of 70amps so the motor can be pushed beyond this with a larger 10-11 inch prop or the use of a 4-cell battery.

    Throughout testing the Motor was cool ESC warm but not hot.
     
    Last edited: May 11, 2017
  17. bogusbandit56

    bogusbandit56 Top Gun

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    I think that may be a bit on the strong side especially on 4s.
    I have just installed an NTM 3530 1100kva motor with a 10x6e prop and after a cuppa tea I will be off to test it.
     
  18. That will rock :)
     
  19. bogusbandit56

    bogusbandit56 Top Gun

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    IT DOES! much better, unlimited vertical ,super rolls and a lot more thrilling.
    I have just returned from the field after just one flight.
    The wind was gusting over the ridge and woods and the turbulence was dreadful.
    The plane was nose heavy with the new motor so I will have to get the battery further back.
    Can`t wait for calmer weather:)
    There is footage but uploading to youtube.
     
    Last edited: May 11, 2017
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  20. Flybyknight22

    Flybyknight22 Top Gun

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    "if" :D
     

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