[NSRCA-discussion] Fw: Trim

[Scott Anderson]

Nat,

slow is a understatement !!

scott
D3 AVP
  ----- Original Message ----- 
  From: Nat Penton 
  To: NSRCA Mailing List 
  Sent: Tuesday, December 20, 2005 8:06 PM
  Subject: [NSRCA-discussion] Fw: Trim


  Things are getting a little slow so I decided to forward this to the list.

  ----- Original Message ----- 
  From: Nat Penton 
  To: David Lockhart ; Dean Pappas 
  Sent: Thursday, November 24, 2005 12:22 AM
  Subject: Trim


  No one seems to understand the following. It is not taught in Aero school and I have never seen it in print. Some of our trim charts even have wing incidence re KE backwards.

  The simple key to understanding the aerobatic airplane is recognizing the fuselage has a nose down pitching moment when yawed. This is why all pattern planes evolved to look alike.

  This is the force that balances, in KE, the up elevator trim needed to fly straight and level. The force is present though  in all attitudes when yawed.

  The magnitude of the moment is determined by the wing relationship to the fuselage. The moment can also be changed by changing the fuselage shape i.e. adding a dorsal or sub-dorsal.
                                                           Nat


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