[NSRCA-discussion] FAT Rudder

Sun Aug 23 10:16:19 AKDT 2009

Arch,

That makes perfect sense. Both vehicle types travel fast enough,
meaning they displace a great deal of air mass. Air is surprisingly
"heavy" at these speeds and small corrective surfaces will assist some
design imperfections. The problem with corrective surfaces is that they
are speed dependent and relationships (speed and force) are not linear.

Thrust vectoring is fine but that also is a correction for the
spiraling air stream, the necessary evil of patterndom and all things with a single propeller providing the thrust. I am looking
forward to someone (maybe myself) creating an egg-crate of sorts just
behind the prop to straighten the flow. Downline brakes would be
tremendous and need for thrust off sets nil. 

Canard surfaces in my new design are set-up to do precisely that...straighten a % of air flow from the prop. Now IF I EVER GET TO FINISH the crate.

A really good compromise is the set-up that Silvestri has used before,
that of the coaxial contra-rotating props up front. Probably a little heavier
and considerably more complex than a single, movable power plant tho. Another very good approach
(also more complex) is a counter-rotating twin. Electric power is ideal for such a set-up. This idea is being
pursued in control line stunt circles BTW.

MattK

PS. Hey Arch...how does an 80 gram 20 X 10 sound ? Considerably stiffer than the plastic stuff.

-----Original Message-----

From: Archie Stafford &lt;astafford at swtexas.net&gt;

To: 'General pattern discussion' &lt;nsrca-discussion at lists.nsrca.org&gt;

Sent: Sun, Aug 23, 2009 12:40 pm

Subject: Re: [NSRCA-discussion] FAT Rudder

Looks to me like someone broke into an F1 garage and started  copying things they saw on the cars…

From: nsrca-discussion-bounces at lists.nsrca.org  [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Vicente  "Vince" Bortone

  Sent: Sunday, August 23, 2009 11:33 AM

  To: General pattern discussion

  Subject: Re: [NSRCA-discussion] FAT Rudder

It is  Spanish.  I will translate the most important portions and let you know  later. 

  Vicente "Vince" Bortone

  ----- Original Message -----

  From: "Wayne Galligan" &lt;wgalligan at att.net&gt;

  To: "General pattern discussion"  &lt;nsrca-discussion at lists.nsrca.org&gt;

  Sent: Sunday, August 23, 2009 10:30:04 AM GMT -06:00 US/Canada Central

  Subject: Re: [NSRCA-discussion] FAT Rudder

There were deflectors at the bottom of the rudder too.  Looks  he is using vector thrusting on the motor too.20Something in there too about a  tubulator on the wing or stab.... me Portuguese ezz no very goot either.

Wayne  Galligan

  From: Phil Spelt 

To: General pattern discussion 

Sent: Sunday, August 23, 2009 10:45 AM

Subject: Re: [NSRCA-discussion] FAT Rudder

My  Portugese is not good at all, but I believe the message says it is Austrian  Mayr Gehards, and something about an innovative (????something)  small  deflector on the upper part of the vertical stabilizer...Anyone have any idea  what they are supposed to do -- what's the benefit, other than increased  tail-feather drag???  Does it direct more airflow over the Rudder at the  top?  Seems to me that they might add more roll-coupling, what with the  increased effect at the TOP of the rudder...

  At 09:38 AM 8/23/2009, you wrote:

Check  out the rudder on the plane part way down this page,,,,,  Gehards from the  WC I beleive.....

  http://www.acro3d.com/public/phpbb3/viewtopic.php?f=19&t=4597&start=105  

  _______________________________
________________

  NSRCA-discussion mailing list

  NSRCA-discussion at lists.nsrca.org

  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

--&gt; There are only two types  of aircraft -- fighters and targets.

  Phil  Spelt, Webmaster & Past President, Knox County Radio Control Society, Inc.

         URL: http://www.kcrctn.com

  AMA--1294,  Scientific Leader Member, SPA--177

        My URL: http://mywebpages.comcast.net/~chuenkan/

        (865) 435-1476 v  (865) 604-0541 c 

_______________________________________________

  NSRCA-discussion mailing list

  NSRCA-discussion at lists.nsrca.org

  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

  _______________________________________________ NSRCA-discussion mailing list  NSRCA-discussion at lists.nsrca.org  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

    _______________________________________________  NSRCA-discussion mailing list  NSRCA-discussion at lists.nsrca.org  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion    

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20090823/2ec6530d/attachment.html>