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  1. #11
    Dr. Looping Looie's Avatar
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    How to launch

    Lets talk about different launching tecniques and their advantages and disadvantages.

    1. handlaunch

    Standard. This plane has no landing gear, and If you have just the plane, wou will have to handlauch. I dont know its caracteristics, but I think the Prop version has too much torque, which makes the prop more difficult than the EDF.

    2. startcar

    I dont know if "startcar" is right but I think you know what I mean.
    There is a trailer for the Lippisch P13a, which was made to carry it from one place to the other
    Click image for larger version. 

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    We could use this as a fun scale detail, although it was just a trailer. Once the plane is fast enouth, lift will lift it off the trailer and it will fly. Could handle torque well, looks amazing, but prop could hit the ground.And I really like that Kettenkrad. Trailer could be made out of wood.

    3. piggyback

    Click image for larger version. 

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    Flite Test just released its piggybacklaunch systen, which works for many different designs. A simple hole in the landing skid and a german WWII bomber could create a very scale launch.
    Last edited by Dr. Looping Looie; 10-12-2017 at 09:24 PM.

  2. #12
    Site Moderator JimCR120's Avatar
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    That little fella looks like the tail end of... something the went through the boneyard guillotine and now has a guy straddling the vertical stabilizer of what's left.

    It's pretty incredible the variety of designs that came out in that era.
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  3. #13
    Dr. Looping Looie's Avatar
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    Found an interesting video with flight footage of a real P13a. Dont know if its fake or not.
    https://www.youtube.com/watch?v=MvtxjSrImHw

  4. #14
    WWII fanatic Grifflyer's Avatar
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    I like your choice, do you think it will be top heavy?
    Always remember this when you are struggling with something, "It is possible.....just not in a way you know yet".
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  5. #15
    Dr. Looping Looie's Avatar
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    Click image for larger version. 

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    Interesting...

    It has a rocket in the back to bring it to 1/2mach to start the ramjet. Ramjets have no moving parts and work only over 500 kilometers per hour. This one was powerd by coal and testet on Dornier bombers. Today, Ramjets are used for cruise missiles and fly with mach 10.
    Last edited by Dr. Looping Looie; 10-13-2017 at 09:40 PM.

  6. #16
    Dr. Looping Looie's Avatar
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    Aerodynamics

    black means plane
    blue means airflow
    red means lift
    Hope you can see something on the pictures

    straight flight

    wings produce uplift, fin produces lift to both sides
    Click image for larger version. 

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    because of the symmetrical profile of the wings, the plane always has to fly with just a very low high alpha.
    when it turns to one side, the fin will produce more lift to the upper site and pull it back in level.

    while flying knifeedge, the fin is the only part that produces lift.
    now it will pull the plane back in the normal position.
    Click image for larger version. 

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    landing

    while landing, it loses high very quick, so the airflow goes up 45degrees from the point of view of the plane.
    now, the fin stables it like a nomal vertical stabelizer.
    Click image for larger version. 

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    Grifflyer yes, it will be top heavy, even the paper models were top heavy and I will have to put the battery in the fin, but I hope, the aerodynamics will work against it.

    Also, a rudder could help with fast rolls because it works like a third aileron.

    And do you know how to install a EDF in this? It needs a thrust tube, but this thing has a rectangle nozzle. And should I place the EDF in the front air intake or in the middle of the plane?

  7. #17
    Building Fool-Flying Noob FoamyDM's Avatar
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    I just got in a 30mm EDF for a small F-117... however, This one Looks like a GREAT candidate for a mini version.

    Motor Placement - the tough part here is that the battery needs to be around the original engine location for balance, near the front, where there isn't room for it except in the thrust tube. Which means the motor might have to move up to offset the rear-ward battery locations. *not an expert here* I think I would consider two 2S batteries hooked in Series to fit in the wings in front of the spar yet creating a 4s. In the mini I'd consider 1S's in the wings or small mAh 2S's in Parallel.

    Thrust tube - I've seen curvy side walls that follow the wing foil elevation wise.

    It Isn't SUPER efficient, but it gets the job done. You could to a split tube that gets squished at the back (like toothpaste tubes). It would be a bit more aerodynamic. but somewhat harder to pull off for the masses. My vote is the curvy side wall.

    Hope it helps. I'm building mine to look like the STARCOM toy!
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  8. #18
    Toothpick glider kid foamtest's Avatar
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    Quote Originally Posted by rockyboy View Post
    I got caught laughing in my office like a crazy person with this one
    Well the lipo does fly, it just needs an airplane around it.
    There isn't anything a little packing tape and hot glue can't fix.

    Maker of toothpick glider and staple plane.

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  9. #19
    Dr. Looping Looie's Avatar
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    Amazing picture:
    Click image for larger version. 

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    Is there a thrust vectoring? Looks like there are control surfaces on nozzles top.

    I also read about extendable landing skid.

  10. #20
    Dr. Looping Looie's Avatar
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    And found the Sea Ducks real life inspiration: The Blohm & Voss BV 138

    Click image for larger version. 

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    Perfect for piggyback launch: just paint your Sea Duck in WWII colors and youre good to go.

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