News:


  • March 29, 2024, 12:48:50 AM

Login with username, password and session length

Author Topic: Kit bashing  (Read 853 times)

Offline James Mills

  • AMA Member and supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 1294
  • Welcome to the Stunt Hanger.
Kit bashing
« on: August 20, 2010, 04:04:35 PM »
I wanted to ask this of some of you who have more experience in designing your own plane.  If you wanted to change an existing design to look like a semi scale, say a Bearcat as an example, can you take the wing/stab (say from Randy's Tempest) and draw the fuse sides while keeping the moments the same or is there more involved?

James
AMA 491167

Offline Tim Wescott

  • 2016 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 12804
Re: Kit bashing
« Reply #1 on: August 20, 2010, 04:22:57 PM »
Is it a profile?

There's some considerations about the height of the stab vs. the wing -- some don't like the idea of putting the stab right behind the wing.

You also want the leadouts to exit the wing at the vertical center of gravity, so the thing will track straight -- get the vertical CG off too much and it'll fly differently inverted than upright (there's a recent FM that published a pair of models -- the "Encore Twins", I think -- one full fuse one profile -- the author puts the prop at a different height to keep the vertical CG the same from one to the other.
AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Randy Powell

  • 21 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 10484
  • TreeTop Flyer
Re: Kit bashing
« Reply #2 on: August 20, 2010, 05:07:18 PM »
Yea, this is the reason that you will see most of Pat Johnston's semi-scale planes with dihedral in the wing. He puts the wing at scale position then uses dihedral to get the leadouts to exit where they are supposed to be.

If you keep the center lines of the wing and stab in the same position relative to the thrust line of the engine (sames as the Tempest, that is) and keep the moments the same along with a side area that is at least in the ball park of the original, then you should be fine.
Member in good standing of P.I.S.T
(Politically Incorrect Stunt Team)
AMA 67711
 Randy Powell

Offline Bill Little

  • 2017
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 12676
  • Second in COMMAND
Re: Kit bashing
« Reply #3 on: August 21, 2010, 09:00:21 AM »
Hi James,

You will simply be following the long honored tradition of CLPA! LL~  Many, many planes back in the late '50s and early '60s were modified Noblers. y1

Follow what Randy P said.  A semi scale might need dihedral, but a lawn dart can be built just by redrawing the fuselage outlines, etc., to suit yourself.

Big Bear
Big Bear <><

Aberdeen, NC

James Hylton Motorsports/NASCAR/ARCA

AMA 95351 (got one of my old numbers back! ;D )

Trying to get by


Advertise Here
Tags:
 


Advertise Here