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PART 3 - R/C B-2 Maiden & Crash - 8 Foot EDF

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Uploaded by on Nov 1, 2009

Well, it got off the ground, but it was not a sucessful day. It crashed for the last time and was retired. :(

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Education

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Uploader Comments (kwahyttam)

  • Were your drag rudders connected to servo's or fixed? It was almost there but the yaw got the better of you. NIce work. you were almost there dude.

  • @Cjudd001

    Thanks! Drag rudders were servo actuated.

  • I guess it would be stable with a KF airfoil.

  • It had a Clark Y airfoil. It didn't need a KF. The reason it was not stable is because I did not open the drag rudders enough to keep the rear from sliding out.

  • I see. Did you ever make one again? We really want to see it fly. =) btw, what do you mean by "to keep the rear from sliding out"?

  • Yeah, sorry, but no new one. That thing was a tough one to build, and too many other projects to have fun with!

    What I mean by the rear end sliding out is when the plane Yawed hard and crashed, you can see the back of the plane whipped out from an uncontrolled yaw moment. This is from inadequate yaw stability, both from the lack of large enough vertical stabs and/or the drag rudders were not open enough to add drag at the very back of the plane to keep it tracking straight.

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  • U mad stal !

  • go 120 mm 12s it should work

  • sorry for your lost but 8ft wing with 70mm EDF twin...just too much drag.. Maybe a 90mm twin EDF would allow you more success. Hope you won't give up.

  • That is really good! Great job man. It did look a wee tail heavy too I think?

    Having it even nose heavy on these helps so much. Not only for pitch and roll stability but it forces you to fly with some up-trim which adds drag in the back which adds to yaw stability. Especially if you have just the inboard elevators set to up trim.

    All in all though, that plane is super well done.

  • need more kv and bigger discharge battery and more mils

  • Actually my dad and me built one and powered by a .60 OS engine in the middle wing. It was a frustration since we did not have the drag rudders. Just a simple aileron and elevators. Though, the B-2 we made was a killer-look. I'll be happy to send you how its looks, just let me know.

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