Jumbo Jet

Discussion in 'Low Power Rocketry (LPR)' started by jqavins, Oct 9, 2019.

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  1. Oct 9, 2019 #1

    jqavins

    jqavins

    jqavins

    Joseph Avins TRF Supporter

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    OK, I've never been (much) into airplane shaped rockets, preferring rocket shaped rockets. (I do have a Quest Force-5 in my fleet; it was a gift.) But there's one I just might have to build.

    A bunch of years ago I made a rocket with an elliptical body tube and two 24 mm motors along its major axis. It was a 4FNC apart from the odd cross section. But looking at it, I thought that tube just begs to be made into a jumbo jet. Assuming that one day I get the parts cut to rebuild it (I have figured out some improvements and now have access to a laser cutter) I might make two sets and do the jet liner also.

    Now here's the thing. If it's going to be a jet liner then it also would be totally cool to use glide recovery. What I'd like to do is start with the wings' roots parallel to the tube's axis, i.e. having no angle of attack (which seems pretty much necessary for a straight ascent) then rotate when the ejection charge fires so that it does have a positive AoA. The CG should move aft as well. And yes, I know, I'm asking for some pain as this will be a bear to trim.

    The CG shift has been done many times. Does anyone know of a way that's been done before to rotate the wings? I can come up with schemes; what I"m asking for (at least for now) is methods that have proven success. Having a good way to do this may just be the thing that pushes me over from thinking about building the plane to doing it.
     
  2. Oct 9, 2019 #2

    Daddyisabar

    Daddyisabar

    Daddyisabar

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    Scissor Wing Transport !
    Estes Corseair, Tomcat.

    Swing wings and pop pods!

    Making scale looking airplane rockets will just lead you to the Dark Arts.
     
  3. Oct 9, 2019 #3

    jqavins

    jqavins

    jqavins

    Joseph Avins TRF Supporter

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    Not helping! If the dark arts they be, so be it.
     
  4. Oct 10, 2019 #4

    burkefj

    burkefj

    burkefj

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    Pop up elevator is much easier to activate to get AoA instead of changing the wing angle.
     
    georgegassaway likes this.
  5. Oct 10, 2019 #5

    mbeels

    mbeels

    mbeels

    Putting the tree in rocketry TRF Supporter

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    Yeah, you can keep the wings at zero degrees with respect to your body tube, and pop up an elevator which will give you the relative angle of attack between those two surfaces that you need for pitch stability. (decalage).
     
  6. Oct 10, 2019 #6

    jqavins

    jqavins

    jqavins

    Joseph Avins TRF Supporter

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    I have seen that done using external rubber bands. Is there a way to do it completely internally? I was thinking of the elevators and some mechanism that has to stay inside the wing, and decided that rotating the whole wing would be easier.
     

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