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Thread: Airborn Speed 400 LMR build for Speed 400 SAM event

  1. #1
    Senior Member Jay Burkart's Avatar
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    Airborn Speed 400 LMR build for Speed 400 SAM event

    I thought that I would blog a bit about building the Airborn design I have been using for the SAM Speed 400 event.
    I have used this design for several years now and have won with it at the SAM Championships.
    This SAM event has limited rules and is a very popular event with great participation due the simple rules and limited
    investment needed for the power plant.
    Basically the rules are:
    Model must be powered by a Graupner Speed 400 6 volt.
    Model must be a SAM legal gas design
    Model must weigh a minimum of 16 oz.
    Task is:
    Climb for 3 minutes maximum during the first 3 minutes of the flight and then attain a maximum
    of 15 minute flight. Land in the field boundaries.

    Most of us find that model sizes of 250 to about 350 sq in work best and having the RTF weight come in right
    at 16 oz seems to work out best for the thermaling part of the flight.
    I highly visible color scheme is an absolute necessity as these model will often climb up to about 1500ft and thermal up to 2000 ft. Indeed this makes it a challenge to see but myself and many of the other regular fliers of this event
    find it doable with good conentration and a high visibility color scheme.

    I typically start out with a Bob Holman Airborn sized at 340Sq in and about a 54" wing span.
    Construction with the short kit is pretty standard except my modification for the motor and landing gear mounting
    which I show in the pictures.
    Attached Thumbnails Attached Thumbnails Airborn Speed 400 006-crop.jpg   Airborn 340 Speed 400 build 033.jpg   Airborn%20fuselage%201-2A%20005.jpg  

    Last edited by Jay Burkart; 07-18-2012 at 06:04 PM.

  2. #2
    Senior Member Jay Burkart's Avatar
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    Vertical and horizontal stabilizer

    Since this is a classic stick built model all construction is done on the plans that are protected by wax paper.
    The stab has one unique property in that the Vertical stab is removable from the horizontal and they both
    are removeable from the fuselage. This is done to minimize the room it takes to transport these models when going to a contest. I have to pack in 10 models when two of us are going to some of the SAM competitions and some of the models are extremely large yet come apart the same way.
    Attached Thumbnails Attached Thumbnails Airborn speed 400 H. Stab and V. Stab 001.jpg   Airborn speed 400 H. Stab and V. Stab 003 (2).JPG   Airborn speed 400 H. Stab and V. Stab 003.JPG  

    Airborn 340 Speed 400 build 038.jpg   Airborn 340 Speed 400 build 039.jpg   Airborn 340 Speed 400 build 041.jpg  

    Last edited by Jay Burkart; 07-21-2012 at 08:25 AM.

  3. #3
    Senior Member Jay Burkart's Avatar
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    Wing for the Speed 400 Airborn build

    Shown is the wing build for the Airborn speed400.
    Pretty standard rib and spar construction.
    Wing is mounted to fuselage with a carbon fiber pin in it's leading edge
    and a 6-32 nylon bolt through the trainling edge.
    Attached Thumbnails Attached Thumbnails Airborn Speed 400 wing 005.jpg   Airborn Speed 400 wing 006.jpg   Airborn Speed 400 wing 007.jpg  

    Airborn Speed 400 wing 009.jpg   Airborn 340 Speed 400 build 042.jpg  
    SAM Grand Champion 2004.07,10,12

  4. #4
    Senior Member Jay Burkart's Avatar
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    Airborn Speed 400 fuselage build

    Then ext and most involved part of the build was the fuselage.
    These are some of the beginning steps in the fuselage.
    Attached Thumbnails Attached Thumbnails Airborn 340 Speed 400 build 006.JPG   Fuselage sides framed up and ready to join 010.jpg   Airborn 340 Speed 400 build 002.JPG  

    Airborn 340 Speed 400 build 009.JPG   Airborn 340 Speed 400 build 010.JPG  
    SAM Grand Champion 2004.07,10,12

  5. #5
    Senior Member Jay Burkart's Avatar
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    Continuing the fuselage build

    Here is further on in the fuselage construction with the tie together of the side and some of the
    built up cowling. lasty is the rails for the lipo tray.
    Jay
    Attached Thumbnails Attached Thumbnails Airborn 340 Speed 400 build 007.JPG   Airborn 340 Speed 400 build 013.JPG   Airborn 340 Speed 400 build 014.JPG  

    Airborn 340 Speed 400 build 015.jpg   Airborn 340 Speed 400 build 022.jpg   Airborn 340 Speed 400 build 023.jpg  

    Airborn 340 Speed 400 build 024.jpg   Airborn 340 Speed 400 build 026.jpg   Airborn 340 Speed 400 build 027.jpg  

    Airborn 340 Speed 400 build 025.jpg  
    SAM Grand Champion 2004.07,10,12

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