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  1. #1
    Join Date
    8th May 2010
    Location
    Winnemucca, NV
    Posts
    904

    Need help with CP for ACE Allegro Largo wedge-fin sim I want to fly tomorrow

    Man I could use some help from one of you. Tomorrow I intend to fly my 4" Ace Allegro Largo with 3 X H class 38/360 sparkies. I have never simmed it because it is known design from back in the day but boy howdy does it seem tail heavy.

    Nosecone 16" long exposed, AeroTech type. 57" of 4" paper airframe. 29.25" of the exposed 1.625" motor tubes (3 of em). Fins are 16" root, 15" leading, 5.5" trailing. The fin shape is a right triangle with the 90" angle between the leading and trailing edge. Fins are 5/16" thick, mounted 2" forward of the end of the MMTs.

    All I need is quick and dirty CP calc so I can balance this and make sure it is stable.


  2. #2
    Join Date
    8th May 2010
    Location
    Winnemucca, NV
    Posts
    904
    Looks like this, but ignore his dimensions and use mine.

    http://v-serv.com/usr/prototype/aceallegrolargo.htm


  3. #3
    Join Date
    19th February 2017
    Location
    The world, probably
    Posts
    749
    How does this look for a start?
    ace.ork

    Stable CG is just at the break to multiple tubes by my extremely rough sim.
    NAR #104043, Jr L1 - 3/18/18
    www.crmrc.org

    Director of Impressive Titles, ArdIU Flight Computer Project:
    lithosphererocketry at gmail dot com

  4. #4
    Join Date
    8th May 2010
    Location
    Winnemucca, NV
    Posts
    904
    To comfirm....stable CG is at junction of motor tubes and airframe? That is C G , not C P ?

  5. #5
    Join Date
    19th February 2017
    Location
    The world, probably
    Posts
    749
    Quote Originally Posted by J Blatz View Post
    To comfirm....stable CG is at junction of motor tubes and airframe? That is C G , not C P ?
    Yes. That's a very rough answer, so I'd give it a bit of a margin, but the bottom line is that.
    NAR #104043, Jr L1 - 3/18/18
    www.crmrc.org

    Director of Impressive Titles, ArdIU Flight Computer Project:
    lithosphererocketry at gmail dot com

  6. #6
    Join Date
    8th May 2010
    Location
    Winnemucca, NV
    Posts
    904
    Thank you for your help!


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