[NSRCA-discussion] FAT Rudder

[Dave]

The EU1 had a relatively short rudder and fin, with the addition of a fairly
big ventral strake into the bottom of the rudder, so the asymmetry of the
rudder was reduced (not as much side area aft of the CG above the thrust
line), reducing the need for right thrust.  The EU1 also had minimal side
area below the thrustline ahead of the CG (also minimizing the need for
right thrust) as the bottom of the plane was pretty close to the bottom of
the spinner.  The great big chins on so many of the modern designs
exacerbate the need for right thrust.  The need for right thrust is reduced
on some of the modern electric designs as the chin is substantially reduced
- Beryll, Azurit, Bravo, for example.

 

Regards,

 

Dave

 

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Phil Spelt
Sent: Monday, August 24, 2009 7:51 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] FAT Rudder

 

Bob,

I would really appreciate a write-up on what causes the need for right
thrust (spiraling air stream from the prop hitting the rudder??), and what
to do to correct it.  What was about the EU-1A that fixed it?

Many thanks,

At 07:18 AM 8/24/2009, you wrote:



For many years, the common explanation for right thrust was torque, and many
people still believe that. This is a case of misdiagnosis. If it is properly
diagnosed, a real fix is much more likely to happen, but doing so with
variable thrust is not, IMHO, the best way to fix it. It can be fixed
aerodynamically, but then you run into the "but it doesn't look cool"
syndrome.

--> 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 <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 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20090824/b5e05659/attachment.html>