FRCFOAMIES F-15 MK2

Discussion in 'FRCFoamies Plans' started by Boxermad84, Jun 18, 2013.

  1. ReDeYe

    ReDeYe Cadet

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    What are you guys recommending for throws in this puppy? Going for speed mostly not aerobatics. I have it set up on 2x4 with rudders. I do have the ailerons on the 1/2 way point down on the horns and the tailerons or elevons on the top.
     
  2. F1wanabe

    F1wanabe Administrator

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    Are your elevons on the wing plate or lower as per plans? If they are on the wing plate then a 3 inch sweep is fine for high speed. (1.5 in up and 1.5 in down). I'd go a little but higher if they are lower down. You get slightly less tv if they are in a scale position.

    www.youtube.com/gstrysky
    www.frcfoamies.com
     
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  3. ReDeYe

    ReDeYe Cadet

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    They are on the wingplate. I tryed to build mine like Scott's. Thank you Greg that will get me something to work with.
     
  4. F1wanabe

    F1wanabe Administrator

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    Any time! With reduced throws you will have to pull back cg a little and you will have less pitch authority so.... No dive bombing! You may not pull out! I still have the prototype with lower elevons and Jay has his with them on the wing plate. He says better response on the wing plate.

    www.youtube.com/gstrysky
    www.frcfoamies.com
     
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  5. Grantman

    Grantman Top Gun

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    I just finished one of these, built from dollar-store foamboard:
    [​IMG]

    The plane balances without the battery so it had to be centered over the cg:
    [​IMG]

    AUW with a 2200mah 3s, F40A esc, a D2826-6 2200kv, and five 9g servos comes out at 654g.
     
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  6. F1wanabe

    F1wanabe Administrator

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  7. F1wanabe

    F1wanabe Administrator

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  8. Boxermad84

    Boxermad84 Administrator

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    Wow, very nice! Did you place your aileron servos in the wing? Very slick! :cool:

    Sent from my galaxy note 3 using Tapatalk pro
     
  9. Grantman

    Grantman Top Gun

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    The build went well even with the thinner foam. I think I can justify buying some more plans seeing as I'm saving a ton on foam.

    @Boxerman84 - yes, the servos are in the wings.
     
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  10. gm3

    gm3 Top Gun

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    how does the dollar store foam compare in strength to weight ratio wit the paper removed as compared to model plane foam or depron?
     
  11. F1wanabe

    F1wanabe Administrator

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    Gm3, I say that mpf is 90 percent as stiff as depron for half the cost, and dt without paper is 50 percent as stiff as mpf for 1/4 the cost. If you laminate 2 sheets of dt together, it is still only as stiff as mpf. That's why I love mpf. And it's discounted now that they are working through the "non perfect" foam.

    www.frcfoamies.com
    www.youtube.com/gstrysky
     
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  12. gm3

    gm3 Top Gun

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    Ok. I've been using mpf for a while but was curious about dt.
     
  13. Grantman

    Grantman Top Gun

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    Couldn't say about MPF, and the only depron I've seen was the rudder piece for my FunCub floats and this is very similar. This particular foam is Ross craft board made by Elmers, only sold at Dollarama, superior to $tree foam but same price, size, and weight. No waves either.
     
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  14. gm3

    gm3 Top Gun

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    ok
     
  15. Grantman

    Grantman Top Gun

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    One of my more typical maidens today, was really not prepared for the roll rate of this bird and drilled her into the ground. Flew really nice for about 4 sconds tho.
    [​IMG]
    [​IMG]
     
  16. F1wanabe

    F1wanabe Administrator

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    Oh no! Did you launch at full throttle by any chance ? The thing is pretty stable on roll with the big billboard stabilizers, but they aren't working at launch. I've always got ailerons at 50 percent throws and 30-40 percent expo.

    www.frcfoamies.com
    www.youtube.com/gstrysky
     
  17. Grantman

    Grantman Top Gun

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    Nope. Half or less. It took off beautifully from my hand and carried on straight and true, everything went bad when I touched the sticks. Ailerons were at 50% throw, no expo. My own fault. I had no idea what to expect from this plane, the only other parkjet I've flown is the Alpha MkII.
     
  18. Boxermad84

    Boxermad84 Administrator

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    Ah, no expo will make it super twitchy on the sticks. That's unlucky, will you repair it?

    Sent from my galaxy note 3 using Tapatalk pro
     
  19. Grantman

    Grantman Top Gun

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    Maybe? Haven't assessed the damage yet, might carve a nose from solid EPS or just start over. There was $6 tops spent building that shell, I can afford to start over.
     
  20. Boxermad84

    Boxermad84 Administrator

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    I would just splice a new nose on, the rest looks OK to me

    Sent from my galaxy note 3 using Tapatalk pro
     
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