Typhoon 2+2

[Henderson,Eric]

Dean is also the Flying Models magazine columnist for Pattern.

Eric henderson.

-----Original Message-----
From: Bill Carpenter [mailto:bcarpenter at greenvilleisp.net]
Sent: Friday, January 31, 2003 12:15 PM
To: discussion at nsrca.org
Subject: Re: Typhoon 2+2


If Dean needs to be vouched for, I'll do it.  I used to fly with him back in
the 90s in the northeast along with the likes of George Asteris, Dave
Lockhart, and Eric Henderson.  He's one of the "good guys."

Bill Carpenter

----------
>From: "Ihncheol Park" <PatternFlyer at msn.com>
>To: <discussion at nsrca.org>
>Subject: RE: Typhoon 2+2
>Date: Fri, Jan 31, 2003, 4:28 AM
>

> In my NSRCA folder of Outlook 2000, I have total of 11 posts made by Mr.
> Pappas.
> I am sure he had lot more posts, but I just don't have them all.
>
> The first one that I have of his post is dated back 6/24/1998 on the subject
> of Yaw wierdness.
> Probably, he was on this list long before that since my inbox only have
> messages after 6/3/98.
> Some how I can not find my archive anywhere in my three hard drives.
>
> Ihncheol
>
> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]On Behalf Of Joe Lachowski
> Sent: Thursday, January 30, 2003 10:03 AM
> To: discussion at nsrca.org
> 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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