Upscale BSG Colonial Viper RC Rocket glider

Discussion in 'Rocket Boosted Gliders' started by burkefj, Feb 11, 2020.

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  1. Feb 11, 2020 #1

    burkefj

    burkefj

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    I had done a 2.6" version of the BSG Viper that flew quite well by using an oversized wing painted black to hide all but the scale viper wing outline. I had thought of doing an upscale but was not convinced that I could get it to come out at a reasonable weight. However, working on my X-15 full fuse using BT-101 I played around with openrocket looking at masses and locations/length and figured if I used a MDRM 4" nose cone I could probably get something around 27 ounces less motor that would work with just minor nose weight, something around 1 ounce only. With the longer nose cone profile I trimmed the body tube back to keep the overall length the same proportion as my smaller version.

    I worked up the dimensions using 1.54 scale factor for the tube diameter ratio and it came out to be. 43" length, 4" diameter, 37.75" wingspan, 31.8 ounces ready to fly with F-25/26 29mm motors to around 450', or with 1/2 ounce added nose weight I could fly on G-38 or G-40 motors at 33.2 oz rtf to 600' or so. I did spend a lot of time belt sanding down and then smoothing the nose cone becuase the outer diameter was too large at the rear with the thinner bt-101 tube. Then I had to cut the top and cut a foam filler plate for the front.

    For the wings/tail I used 9mm depron for stiffness with a small spar in the vertical stab and two 1/8" spars in the wing. I'll work my way up with the motors to make sure I'm not pushing the speed too fast to cause flutter. I normally try to keep my boost speeds below 120fps but these are simulating at 150, 170 and 200fps. The span of the wing is well supported and pretty stiff.
    I did insert some stiffener foam vertical plates in each bottom half of the side boosters to help on landing to support them.

    Here she is balanced and ready to go, just waiting on motors and the decals from stickershock.

    84631008_556728504963797_6791411290133757952_n.jpg
     
    Last edited: Feb 13, 2020
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  2. Feb 11, 2020 #2

    rharshberger

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    Looking forward to seeing that monster fly!
     
  3. Feb 11, 2020 #3

    burkefj

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    Here are some pictures of how it went together.
    IMG_20171224_143401253.jpg IMG_20171224_143415433.jpg IMG_20171224_145447783.jpg IMG_20171224_145808914.jpg IMG_20171224_150543789.jpg IMG_20171224_151547728.jpg IMG_20171224_152318462.jpg IMG_20171224_152518151.jpg IMG_20171224_155128861.jpg IMG_20171224_155133794.jpg
     
  4. Feb 11, 2020 #4

    burkefj

    burkefj

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    And here are the rest.

    IMG_20171224_155140186.jpg IMG_20171224_164640254.jpg IMG_20171224_164708938-1024x576.jpg IMG_20171224_171344122-1024x576.jpg
     
  5. Feb 11, 2020 #5

    aerostadt

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    What is the thickness of the wings? I agree with Rich it will be fun to see this fly!
     
  6. Feb 11, 2020 #6

    burkefj

    burkefj

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    9mm depron

     
  7. Feb 12, 2020 #7

    Crawf56

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    "By your command."
     
  8. Feb 13, 2020 #8

    BABAR

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    Those cakie things look pretty good too!
     
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  9. Feb 13, 2020 #9

    burkefj

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    Those are homemade French canele cakes that my daughter made...

    QUOTE="BABAR, post: 1963398, member: 8312"]Those cakie things look pretty good too![/QUOTE]
     
  10. Feb 13, 2020 #10

    burkefj

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    And she's all ready to go...

    IMG_20200212_161938222.jpg
     
  11. Feb 15, 2020 at 12:47 AM #11

    burkefj

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    All I gotta say is Holy Frak! She is a sweetheart, moving slowly from F-26 through G-40 really solid and a pussycat to land.
     
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  12. Feb 15, 2020 at 2:35 AM #12

    neil_w

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    That is a big boy all right. Superlative work as always, Frank.
     
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  13. Feb 15, 2020 at 4:23 AM #13

    aerostadt

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    That is amazing! From the front the model looks to me too bulky to fly.
     
  14. Feb 15, 2020 at 12:55 PM #14

    Charles_McG

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    So say we all!
     
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  15. Feb 18, 2020 at 7:04 PM #15

    aerostadt

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    Launch All Vipers !!

     
  16. Feb 19, 2020 at 11:29 PM #16

    OC-Patrick

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    … can you post photos of the nose cone - thanks!
     
  17. Feb 19, 2020 at 11:47 PM #17

    BABAR

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    [/QUOTE]
    Ship a few of those with each kit and you will double your business!

    Any models optimized purely for flight characteristics? You have clearly mastered making just about anything fly!
     
  18. Feb 20, 2020 at 3:40 AM #18

    burkefj

    burkefj

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    Flight optimization isn't my interest, so no I haven't done that. There are many excellent prefabbed dlg gliders that can be converted fairly simply that would out do anything I could design. My interests and why I got into the business was because there were no cool looking sport flyers that were easy to build and that's what I'm trying to provide. JH aerospace offers some in the performance glider vein.

    Another aspect is how much time and money I want to invest in the business. I'm able to offer a large variety since I cut these to order and use common materials and tooling. There really is no money to be made in the RC rocket glider business, and that's not why I'm doing it, I don't want to invest in laser cutters different materials, carbon fiber etcetera which would be required to offer something that would be competition competitive.

    Any models optimized purely for flight characteristics? [/QUOTE]
     
    Last edited: Feb 20, 2020 at 5:48 PM
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  19. Feb 21, 2020 at 12:57 AM #19

    Crawf56

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    We greatly appreciate your efforts. :)
     

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