Sidemounted engine

[Nat Penton]

A pure way to determine effect would be to install a tip weight on one wing and double the tip weight half way out on other wing. Another flight condition  subject to unwanted inertial forces  ( effected by weight assymetry about the pitch axis )is starting and stopping the spin. I don't think these forces affect the spin in a noticeable way. Who wants to make the nose as long as the tail- hoho !
  ----- Original Message ----- 
  From: Rcmaster199 at aol.com 
  To: discussion at nsrca.org 
  Sent: Sunday, January 18, 2004 2:59 PM
  Subject: Re: Sidemounted engine


  Jeff or Nat, to prove the point or disprove it, it might be worthwhile to run a simple experiment. Add, say, 6-8 ounces of lead to one wheel pant to cause an assymetric condition, and counter the out of balance condition with enough weight on the opposite wing tip. That much weight in the pant seems about right to simulate a skewed rather than orthogonal engine installation. Then  get to the rolls, fast slow and everything in between. It would be interesting to see what you get

  Matt K


    Subj:Re: Sidemounted engine 
    Date:1/18/2004 2:23:30 PM Eastern Standard Time
    From:jhughes at hsonline.net
    Reply-to:discussion at nsrca.org
    To:discussion at nsrca.org
    Sent from the Internet 



    Well, while I agree it's not worth worrying about. I do believe that it wouldn't matter what orientation you mounted a single cylinder engine, there would be some manuevers affected. But, axial rolls in particular wouldn't matter.. Side, inverted, upright, from a mass distribution standpoint, the plane couldn't tell. It would only be some wierd progression type manuever (tumbles, etc).



      ----- Original Message ----- 
      From: Nat Penton 
      To: discussion at nsrca.org 
      Sent: Sunday, January 18, 2004 8:57 AM
      Subject: Re: Sidemounted engine


      The forces causing a non-axial roll occur only during the acceleration phases of the roll ( starting and stopping ). Undesireable forces are generated because masses at different distances from the roll axis experience different rates of acceleration. In practice I don't think we have a problem with the side-mounted engine. Would someone tell me where to find the Mars pictures.        Voodoo


        ----- Original Message ----- 
        From: Jeff Hughes 
        To: discussion at nsrca.org 
        Sent: Sunday, January 18, 2004 11:35 AM
        Subject: Re: Sidemounted engine


        Too really have the minimal, an electric motor and batteries on the Cg running a driveshaft out to the nose would be the best solution. 


          ----- Original Message ----- 
          From: Chuck Wagoner 
          To: discussion at nsrca.org 
          Sent: Saturday, January 17, 2004 11:45 PM
          Subject: Re: Sidemounted engine


          Jeff,
          What about a comparison of a "centered" electric vs. a twin?
          Chuck

          ----- Original Message ----- 
          From: Jeff Hughes 
          To: discussion at nsrca.org 
          Sent: Saturday, January 17, 2004 11:36 PM
          Subject: Re: Sidemounted engine


          Though on a pattern plane, side mounted is just point of view. In knife edge an inverted engine is now side mounted. We're all going to have to go to twins to solve this issue!

          ----- Original Message ----- 
          From: Nat Penton 
          To: discussion at nsrca.org 
          Sent: Friday, January 16, 2004 6:01 PM
          Subject: Sidemounted engine


          Looking at the undesirable forces that would be generated by the assymetric distribution of weight to achieve lateral balance - hard yaw or tight corners would produce no effect because all components would be subject to the same acceleration. There would be an effect during roll, however, because the masses are subjected to different rates of acceleration (polar ) . Our planes damp and reach steady state roll rapidly . These unwanted roll forces would cause a change in pitch ( same as when one aileron has more throw ) during their short life . The magnitude of the pitch change would be hard to quantify ( by me 










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