[NSRCA-discussion] Trailing Edge

Tue Feb 13 15:30:13 AKST 2007

This is not necessarily in the same idea you all are discussing but intesting. I went to an indoor precision/freestyle event in a small gym a month ago. It was interesting to see what they do to the small foamy precision models to slow them down. 

  And that brings me to the flat plates they were flying on the trailing edges of the ailerons approximatly 1/2" wide perpindicular to the airflow; talk about thick trailing edges.

rcmaster199 at aol.com wrote:
    Nat, Dean,

  It seems to me that for the kind of thing we are involved in, the boost in control performance is desired. Drag is not necessarily our enemy...in fact quite the contrary. We've been building fattened TEs on our models' control surfaces and have been deriving the benefits, perhaps unwittingly. It has been useful information and the benefits would appear to outweigh the penalty.

  However, this may not hold true for other flight regimes. If one were to look at the wing TE of a 777 for example.....quite sharp. Ditto for fighters and racers. These are distinct and different regimes than our interest, with a totally different goal in mind....n'est-ce pas? 

  On the other hand, sailplanes would probably also benefit and here there appears to be a mixed bag of thicknesses.

  I guess the point is "it depends"

  Matt

-----Original Message-----
From: d.pappas at kodeos.com
To: nsrca-discussion at lists.nsrca.org
Sent: Tue, 13 Feb 2007 1:25 PM
Subject: Re: [NSRCA-discussion] Trailing Edge

    .AOLPlainTextBody {      margin: 0px;      font-family: Tahoma, Verdana, Arial, Sans-Serif;      font-size: 12px;       color: #000;       background-color: #fff;   }    .AOLPlainTextBody pre {      font-size: 9pt;  }    .AOLInlineAttachment {      margin: 10px;  }    .AOLAttachmentHeader {      font: 11px arial;      border: 1px solid #7DA8D4;      background: #F9F9F9;  }    .AOLAttachmentHeader .Title {      font: 11px arial;      background: #B5DDFA;      padding: 3px 3px 3px 3px;  }    .AOLAttachmentHeader .FieldLabel {      font: 11px arial;       color: #000000;      padding: 1px 10px 1px 9px;      background: #F9F9F9;  }    .AOLAttachmentHeader .FieldValue {      font: 11px arial;       color: #000000;      background: #F9F9F9;  }    .AOLAttachmentHeader a, .AOLImage a {      color: #2864B4;      text-decoration: none;  }    .AOLAttachmentHeader a:hover, .AOLImage a:hover {      color: #2864B4;      text-decoration: underline;  }    .AOLWebSuiteCompose
 .AOLPicturesFullSizeLink,  .AOLWebSuite .AOLPicturesFullSizeLink {      height: 1px;      width: 1px;      overflow: hidden;  }    body {      background-color: white;      font-family: "Verdana";      font-size: 10pt;      border: 0px;  }    .AOLWebSuiteCompose p {      margin: 0px;      padding: 0px;  }    img.managedImg {      width: 0px;      height: 0px;  }    img.placeholder {      width: 275px;      height: 206px;      background: #F4F4F4 center center no-repeat;      border: 1px solid #DADAD6 !important;    }              Hi Nat,
  So the Princeton Aero department had many of its facilities just a couple of miles up US Route 1 from the College, at Princeton-Forrestal airport.
  It is owned by the University. The land is gradually being gobbled up by industrial developments and the runway is gone now. Bummer 'cause we used to hold a Pattern contest there years ago. 

  The SAE weight lifting contest is still a going concern. It sure is neat ... why wasn't this sort of thing around when I was in Engineering School?

  Dean Pappas 
Sr. Design Engineer 
Kodeos Communications 
111 Corporate Blvd. 
South Plainfield, N.J. 07080 
(908) 222-7817 phone 
(908) 222-2392 fax 
d.pappas at kodeos.com 
    -----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Nat Penton
Sent: Tuesday, February 13, 2007 11:29 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Trailing Edge

  Dean
  The old NACA must have done this research in the distant past. I recall, in the 80s, Jim Bede extolling on the virtues. 

   The Princeton project, that would be fun, especially as a student. Would have kept my attention <G>.              Nat
    ----- Original Message ----- 
  From: Dean Pappas 
  To: NSRCA Mailing List 
  Sent: Tuesday, February 13, 2007 10:03 AM
  Subject: Re: [NSRCA-discussion] Trailing Edge

  Thanks Nat,
  I have a guy in the local club who corroborates Barnaby's statement. Locally to NSRCA D1, back in the 80's he was known as "forever in Sportsman George".
  He is recently retired from teaching at the Aero group at Princeton U. and he still coaches the students involved in the weight lifting contest.
  It was nice to have an excuse to go hunt him down!

  later,
  Dean

  Dean Pappas 
Sr. Design Engineer 
Kodeos Communications 
111 Corporate Blvd. 
South Plainfield, N.J. 07080 
(908) 222-7817 phone 
(908) 222-2392 fax 
d.pappas at kodeos.com 
    -----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Nat Penton
Sent: Tuesday, February 13, 2007 1:05 AM
To: NSRCA Mailing List
Subject: [NSRCA-discussion] Trailing Edge

  Kitplanes, Dec 06           Wind Tunnel by Barnaby Wainfan

  " The airfoil with the chopped trailing edge will produce slightly more lift at the same angle of attack than a sharp trailing-edged airfoil. Because the wake is filled in the controll is crisper and more effective and does not have to move as far to cause a change in lift"

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