Typhoon 2+2

[Ed Miller]

I second that......I vaguely remember a Dean.....
So you back ???
Ed M.
----- Original Message ----- 
From: "Joe Lachowski" <jlachow at hotmail.com>
To: <discussion at nsrca.org>
Sent: Thursday, January 30, 2003 1:03 PM
Subject: RE: Typhoon 2+2


> Dean Pappas?? Who Dat?
> 
> 
> >From: "Dean Pappas" <d.pappas at kodeos.com>
> >Reply-To: discussion at nsrca.org
> >To: <discussion at nsrca.org>
> >Subject: RE: Typhoon 2+2
> >Date: Thu, 30 Jan 2003 13:01:13 -0500
> >
> >Hello Larry,
> >
> >You want to preserve the location of the point that is 25% of the M.A.C.
> >(mean aerodynamic chord)
> >That preserves the moment arm lengths, balance point, yaw damping and
> >just about any other trimming behavior.
> >
> >As an approximation, go half-way out on the wing panel (actually closer
> >to the root) find the point at 25% of that chord, and rotate things
> >around that point.
> >Your 35-inch panel is actually a 38 or so inch panel , from the cl of
> >the model. I am assuming about a 6" fuse width.
> >The error won't matter a bunch.
> >The MAC is 16.4" from the model centerline.
> >The 25% point is 10.5" forward of the trailing edge, that far out.
> >That's the spot that needs to stand still.
> >The tip has to move forward about 30% more than the amount the root
> >moves back, in order to preserve the 25% MAC position.
> >
> >I presented the graphical method cor calculating the MAC somne time ago
> >in Flying Models, but maybe it's time for a repeat.
> >
> >Wing sweep contributes a dihedral effect when the wing is lifting.
> >That's not the case in Knife Edge, so the
> >roll coupling in KE flight should not change.
> >Regards
> >     Dean Pappas
> >
> >
> >-----Original Message-----
> >From: Larry Diamond [mailto:ldiamon at kimball.com]
> >Sent: Thursday, January 30, 2003 11:49 AM
> >To: NSRCA
> >Subject: Typhoon 2+2
> >
> >
> >
> >I'm planning on scratch building a Typhoon 2+2. Just received the
> >plans...
> >
> >In following a number of threads and talking to a few people I have some
> >design questions...
> >
> >I plan on reducing the wing to about 975sqin and tapering the trailing
> >edge forward about 1" (about 1 1/2 degrees). This is based on
> >conversations of what some have found to perform better for stall spins
> >and snaps.
> >
> >Rough estimates.
> >
> >Root rib - about 18
> >Tip Rib - about 8
> >Panel span - about 35 to 35.5.
> >Airfoil - same as plans for T2+2.
> >Don't plan on changing the stab unless advised to.
> >
> >Accounting for CG appears to have three options.
> >
> >1) Move the wing tube hole in the fuse back.
> >2) Move the wing tube hole in the wing panels forward.
> >3) Combination of the two.
> >
> >Which is preferred and what effects does it have on other performance?
> >
> >I'm at a loss for how this might effect the dihedral. Still keep the top
> >of the wing flat and let the bottom fall where it may.
> >
> >The intent of the plan will be to fly intermediate and take me into
> >advanced. I have some books on design on the way. However, I would like
> >to understand the relationships from practical experience.
> >
> >The easy answer is to use a wing configuration that someone else has
> >that is tried and proven. I would be open to this. But would still be
> >interested in any thoughts for design.
> >
> >Perhaps this could be a good tech article for the K-Factor or possibly a
> >running series.
> >
> >Larry
> >NSRCA 3083
> >AMA 5024
> >
> 
> 
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