FRCFOAMIES F-15 MK2

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

  1. Airflow

    Airflow Top Gun

    Greg It sounds promising, take your time! Will the plane/plans be released with both mid and rear-mounted configuration.? And a second question concerning the Su-mk2. Do you have any plans to release a rear-mounted version. Su-Mk2RM ;-) This plane is amazing to fly. But I will soon need a new challenge. And I think a rear mounted Mk2 Could give me and others a new and exciting challenge!;)
     
  2. e3_Scott

    e3_Scott Top Gun

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    Yes, I used 6mm on top and 3mm on bottom, both depron.

    Cheers,

    Scott
     
  3. Airforce101

    Airforce101 Top Gun

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    Ah I see. Do you think that resulted in some of the zooming you were getting at high speed?
     
  4. e3_Scott

    e3_Scott Top Gun

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    I don't think so, I checked that as it was mentioned to me to make sure that the bottom layer was not bigger than the top layer. Most of it was corrected by angling the motor downwards. I think the Kf4 helped considerably with the speed. With planes like the FRC F15 and the F35 V2 from RCP, I think the wing and fuselage add a lot of natural lift, so the faster it goes, the more lift that is experienced, so rather than adding more weight, I angled the motor downwards and that took care of most of the zoom.

    Cheers,

    Scott
     
  5. F1wanabe

    F1wanabe Administrator

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    Airflow, the challenge with this size is to mount motor on the back and still have room to mount elevons. They would have to be flying elevons, meaning mounted on the sides with cf tubes and rods. You can do this yourself though. I have modified a couple planes this way in the past.

    youtube/gstrysky
    frcfoamies
     
  6. Airflow

    Airflow Top Gun

    Greg, Yes, I have touched on the idea of modifying the way you describe. Or simply make the elevator in one piece. Since it works fine in my mid-mounted Mk2. The ailerons are so efficient that the roll rate is fast anyway. Just wondered in case you planned something. Given that the FRC F-22 comes in two different versions, Mid and rear mounted... I will build the rear-mounted F-22
     
  7. F1wanabe

    F1wanabe Administrator

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    Ooh, a rear mount taker! Excellent! The f22 rear mount really flies well since the scale bodywork makes it fly very stable.

    youtube/gstrysky
    frcfoamies
     
  8. Airflow

    Airflow Top Gun

    Yeah I got hooked on this concept since I mounted the motor on the elevator to my F-22 V2. Rear-M-TV is the only thing I miss on my Su-mk2. When my SU is ready for the junkyard, I will build a new one with rear mounted TV. Just like the FRC F22:)
     
  9. e3_Scott

    e3_Scott Top Gun

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    Airflow -

    Perhaps you have already seen it, FRC has plans for a twin engine rear mount Su37 MK1 that Greg has amazing flying footage of and comparison video on his youtube channel.

    If you are looking for another challenge and have a couple 2200 KV motors laying around...:rolleyes:

    Cheers,

    Scott
     
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  10. F1wanabe

    F1wanabe Administrator

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    Oh yeah, why didn't I think of that!


    youtube/gstrysky
    frcfoamies
     
  11. e3_Scott

    e3_Scott Top Gun

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    Sorry Greg...didn't mean to steal your thunder...:oops:

    Cheers,

    Scott
     
  12. Airflow

    Airflow Top Gun

    An excellent idea Scott, I've seen the video. When my Su-34 has made its final journey ...

    You see, I have already plans for a replacement in a laaaarger size ... ;-) With several engines, Spring 2014
     
  13. F1wanabe

    F1wanabe Administrator

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    Not at all, Scott!

    youtube/gstrysky
    frcfoamies
     
  14. Airforce101

    Airforce101 Top Gun

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    Hi Scott, to focus on only this part (the other bits of your post are spot on, as usual :)):

    But you didn't have equal Kf's on top and bottom: the top was 6mm and the bottom 3mm, so even if the width and length of the pieces were the same, you had a difference, creating lift because the air on top of the wing had to cover a greater distance than the air passing along the bottom of the wing, resulting in lower air pressure on the top, making your plane rise.

    Or am I just rambling here?
     
  15. e3_Scott

    e3_Scott Top Gun

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    The thickness of the KFs when you are talking about Kfs and "zooming" is not as critical as making sure the Kfs are the same width from leading edge to trailing edge of the foil. If the one on the bottom was wider, it would pull the back of the wing down, making the nose rise. Sorry, I should have explained it better.

    It is important when making the Kf4s to ensure that they are the same width from front to back to ensure your wing still functions properly.

    Cheers,

    Scott
     
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  16. Airforce101

    Airforce101 Top Gun

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    Ah Ok, thanks.
     
  17. F1wanabe

    F1wanabe Administrator

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    While most people relax and take in the sites while on vacation, Jay is hard at work cutting out our next scale mk2 plane.... The F15 mk2!
    uploadfromtaptalk1374171412650.jpg
    uploadfromtaptalk1374171424767.jpg

    youtube/gstrysky
    frcfoamies
     
  18. F1wanabe

    F1wanabe Administrator

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    Jay working on the F15 mk2 assembly... uploadfromtaptalk1374201902318.jpg
    uploadfromtaptalk1374201928092.jpg

    youtube/gstrysky
    frcfoamies
     
  19. F1wanabe

    F1wanabe Administrator

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    And... The finished plane!
    uploadfromtaptalk1374202418550.jpg
    uploadfromtaptalk1374202456631.jpg
    uploadfromtaptalk1374202477057.jpg
    uploadfromtaptalk1374202494757.jpg
    The pieces fit flawlessly which is a testament to Jay's design work. There are a couple interesting scale pieces. The lowered elevons, the moulded upper Kfs and the slight step on the strakes area on the inside wing. Tomorrow morning is testing, then off to Maryland to fly with JettaManDan, FED50H, AsSoulsDream and AsSouls wife and Ray-the-heli-guy!

    youtube/gstrysky
    frcfoamies
     
  20. you need to leave before noon damnit? get ur butts down here!!!!!
     
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