Estes 1376 NASA Pegasus Cg question

Discussion in 'Low Power Rocketry (LPR)' started by Charles_McG, Jun 29, 2018.

  1. Jun 29, 2018 #1

    Charles_McG

    Charles_McG

    Charles_McG

    Ciderwright

    Joined:
    Sep 12, 2013
    Messages:
    1,299
    Likes Received:
    11
    Location:
    SE Wisconsin
    Does anyone have an original scale model they could measure the dry center of gravity on, please?

    I've found notes on the Cp - but not the Cg.

    I've lost my original, and am trying to balance my upscale to match.
     
  2. Jul 6, 2018 #2

    EXPjawa

    EXPjawa

    EXPjawa

    Well-Known Member

    Joined:
    Jan 27, 2015
    Messages:
    2,143
    Likes Received:
    3
    I built a one-size up upscale (BT60). If it helps at all, I can measure CG on that and you can scale it as required.
     
  3. Jul 6, 2018 #3

    Charles_McG

    Charles_McG

    Charles_McG

    Ciderwright

    Joined:
    Sep 12, 2013
    Messages:
    1,299
    Likes Received:
    11
    Location:
    SE Wisconsin
    Sure. I built one downscale at BT20. We can compare.
     
  4. Jul 7, 2018 #4

    chrisudy

    chrisudy

    chrisudy

    Well-Known Member

    Joined:
    Jan 18, 2009
    Messages:
    511
    Likes Received:
    0
    I added a baffle to my BT-55 so it won’t be much help. I can check on any of the others - they’ve all flown nicely... IMG_4937.jpg
     
  5. Jul 7, 2018 #5

    Charles_McG

    Charles_McG

    Charles_McG

    Ciderwright

    Joined:
    Sep 12, 2013
    Messages:
    1,299
    Likes Received:
    11
    Location:
    SE Wisconsin
    Nice collection!

    My mini and my mega balance about half a caliber behind the leading edge of the side tubes. With a motor. Just in front of the tubes without motor.
     
  6. Jul 7, 2018 #6

    chrisudy

    chrisudy

    chrisudy

    Well-Known Member

    Joined:
    Jan 18, 2009
    Messages:
    511
    Likes Received:
    0
    That’s where mine typically balance as well.

    Chris.
     
  7. Jul 9, 2018 #7

    EXPjawa

    EXPjawa

    EXPjawa

    Well-Known Member

    Joined:
    Jan 27, 2015
    Messages:
    2,143
    Likes Received:
    3
    Mine balances .75 caliber ahead of the side tubes without a motor (or motor retainer ring - I used an Estes 24mm plastic retainer).
     
  8. Jul 9, 2018 #8

    Charles_McG

    Charles_McG

    Charles_McG

    Ciderwright

    Joined:
    Sep 12, 2013
    Messages:
    1,299
    Likes Received:
    11
    Location:
    SE Wisconsin
    Thanks.

    My Mega (38mm mount built from Mega Der Red Max and Leviathan kits) had its first flight Saturday. Beautiful, stright flight.

    Now, to get some decals.
     

Share This Page