FRCFOAMIES F-15 MK2

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

  1. fishwhisperer83

    fishwhisperer83 Ace Pilot

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    So i remaidened the f-15 cheetah on saturday and it is super maneuverable. It flew real funky when the canards were flat to the wing. I think the cg was to far back so when that extra lift was put in front it wanted to raise the nose and torque roll. But by angling the canards down it worked out better. If i do this again i would sand down the leading and trailing edge of the canard so that there is as little air disturbance on the wing. But the flips are amazing. Flips right around the canard. And when you pull around fast in an Immelmann it stays locked in no problem. It couldnt go very fast ( partially because of my poor hinge job) but the maneuverability made up for it. The ail work wonders and i will definitely add rudders next time. Heres the video of it with other planes as well.
     
  2. theyungone

    theyungone Airman

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    Hey guys, finally managed to find my usb cord for my camera so i thought i'd post the life, death and rebirth!....and death again! of my plane! Hope you enjoy! The first crash was due to some cricket players... i didnt realize it at first but after looking back. i remember one of them running towards in the direction close to where the ball hit my plane mid flight! took out one of the elevons clean off! i cut the throttle and the plane glided head on into a fence. I probably could have avoided it with some rudder but i panic'd! Second crash was due to flying inverted! started losing control and it got low to the ground and i panic'd again! and my reflex pulled down on the stick and straight into the ground.. ah well it was a great plane.. sure wish i didnt have a 2x4 setup though cause my loops were soo sloppy.. could barely do a proper one.
     

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  3. F1wanabe

    F1wanabe Administrator

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    theyoungone, Ours is 2x4 also and loops are smooth as silk! Are you sue you have ailerons set on half throws? If the throws are too high you'll get sloppy loops.
     
  4. theyungone

    theyungone Airman

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    hmm... yea that must have been why. i mechanically lowered the throws on the ailerons but guess it still had too much. But i LOVE the way mine spiraled through the air.. would lose all orientation so i sorta just kept it that way and didnt do too many loops. My new f22 raptors got 4x4 (first time) and im absolutely inlove with it right now :)
     
  5. Razer_Ghost

    Razer_Ghost Rookie

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    Can anyone send some pictures of were you have been putting the esp, receiver, and battery.
     
  6. F1wanabe

    F1wanabe Administrator

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    Razer ghost, due to the layout of the power system and cg requirements, you would have your motor mounted to the plane at the mount area, esc must go just forward of that in the hatch, then rx forward of that, then battery in the front of the hatch. The alternative to this Is mounting the esc Underneath the plane in the airflow just ahead of the motor if you are concerned about heat. But battery will always be in the forward portion of the hatch and you can slide it forward or back to achieve correct cg.

    www.youtube.com/gstrysky
    www.frcfoamies.com
     
  7. Razer_Ghost

    Razer_Ghost Rookie

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    Thanks F1. My dad is building the F15 and I am building the SU37. He was looking for some pictures so he could figure out how the hatch would need to be cut out and the body is a little thinner than the SU37 and thought he would not be able to fit everything.
     
  8. F1wanabe

    F1wanabe Administrator

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  9. Razer_Ghost

    Razer_Ghost Rookie

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    One more thing. When I printed out he plans the body can out to be 40" but the wing span is 28". I tried it with both letter and full size sheet. Also both stabilizers are not the same size on the plans too.
     
  10. Boxermad84

    Boxermad84 Administrator

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    hi razer. did you check the scale is correct? it should be 50mmx50mm, ill look into the stabilizers. the bigger one is the correct size.
     
  11. F1wanabe

    F1wanabe Administrator

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    Did you use tiled plans or full sheet? Both Jay and I and several other people have built the F15 from full sheet with no problems. As Jay says, checking the scale mark will tell whether the print is good.

    www.youtube.com/gstrysky
    www.frcfoamies.com
     
  12. okie86

    okie86 Airman

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    hey Jay if I scale the f15 up to about 120% I would get a size of 32in wingspan and a length of 48inches right
     
  13. Boxermad84

    Boxermad84 Administrator

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    You would get a wingspan of around 31" 32" wingspan yes.

    Sent from my GT-I9100 using Tapatalk
     
  14. Razer_Ghost

    Razer_Ghost Rookie

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    I tested the tiled and full sheet and both have the correct scale, 50x50. It is not a big deal was just making sure. An extra 2 inchs on the wing will not hurt it. My dad says everything lines up like it should and he is not having any problems with it. Once it is done I will post pictures on both my SU37 and his F15. They just looks so much better than a profile jet.
     
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  15. Boxermad84

    Boxermad84 Administrator

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    Awesome, glad it's sorted! Good luck with the build!

    Sent from my GT-I9100 using Tapatalk
     
  16. e3_Scott

    e3_Scott Top Gun

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    Hi everyone -

    Getting ready to cut out the parts for this plane in the next couple days.

    Quick question about the strip called "upper engine nacelle" that is on the sheet with the upper and lower KFs. Does this strip add any benefit to the aerodynamics and handling of the plane, or conversely if I leave it off, will it adversely affect how the plane handles?

    EDIT: I should add that I will be using top and bottom Kfs on my build if that makes a difference.

    Thanks.

    Cheers,

    Scott
     
    Last edited: Jan 24, 2014
  17. F1wanabe

    F1wanabe Administrator

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    No Scott, just for scale looks! When Jay and I built it together we used 3mm depron and Sanded the outside and rear edge thin. If you would like, you can leave it off with no I'll effects. Get your rudder mojo going. This plane has the best rudders I've ever felt! Also, the plane is a big lifting body so it can handle extra weight if you want to do full controls with big power system.

    www.youtube.com/gstrysky
    www.frcfoamies.com
     
  18. e3_Scott

    e3_Scott Top Gun

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    Thanks.

    Cheers,

    Scott
     
  19. Boxermad84

    Boxermad84 Administrator

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    Have you recently downloaded the plans Scott? One of the stabilisers was bigger than the other in the original plans, no big deal but I've adjusted it in the new plans

    Sent from my SM-N9005 using Tapatalk
     
  20. Boxermad84

    Boxermad84 Administrator

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    I did just kfs on mine to[​IMG]

    Sent from my SM-N9005 using Tapatalk
     
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