RE: Re: Hints for Cat IV LPP flying [2 Attachments]

From: Tony MATHEWS <tmathews1_at_sympatico.ca>
Date: Thu, 25 Mar 2010 17:24:47 -0400

Bill, is the black thingy (technical term I'm sure:) in the second picture the heat shrink tubing sleeve? What's the diameter? 3/32"??And the length?
Tony

To: Indoor_Construction_at_yahoogroups.com
From: wdgowen_at_gmail.com
Date: Thu, 25 Mar 2010 13:11:42 -0400
Subject: Re: [Indoor_Construction] Re: Hints for Cat IV LPP flying [2 Attachments]


















 



  


    
      
              
        [Attachment(s) from Bill Gowen included below]
        
      
      



Yes the CG shift will mess up your flight but the damage is usually less
than a fouled prop. Both are bad news.
 
For LPP I use Radio Shack heat shrink tubing - the kind that is fairly
stiff.
 
One additional step I take is to push the sleeve over the o-ring after the
motor is on the model. I usually have to squish the o-ring into an oval with a
pair of pliers to do this. For A6 I use a special prop hook that lets me slide
the sleeve over the prop hook as well. I intend to try this for LPP but haven't
yet.
 
For the rear hook I have the knot just forward of the sleeve instead of at
the o-ring. When the motor is wound the knot pulls the sleeve back against
the rear hook.
 

  ----- Original Message -----
  From:
  ykleetx
  To: Indoor_Construction_at_yahoogroups.com
  
  Sent: Thursday, March 25, 2010 8:54
  AM
  Subject: [Indoor_Construction] Re: Hints
  for Cat IV LPP flying
  
  
  
  
  
I'm interested to know how to make a sleeve and use it. Your
  guidance is appreciated.
  

  On using a 24" motor on an LPP -- there seems to be additional
  difficulties. I noticed the non-uniform bunching and subsequent
  unwinding of the motor cause a rear shift in the CG, especially due to rubber
  bunching near the tail hook. I read that you can do a single-loop braid
  to mitigate some of this.
  

  On winding such a long motor -- as I stretch wind it from about 100",
  should I finish winding to its maximum torque when the motor is back to its
  natural length of 24" or should I continue to wind it until the motor is at
  9"?
  

  Thank you!
--- In Indoor_Construction_at_yahoogroups.com,
  "Bill Gowen" <wdgowen_at_...> wrote:
>
> Re: sleeves
> In
  a contest where you get 5 tries and there are usually time restraints a fouled
  prop can ruin your chances. A record trial is a different animal from a
  contest. At a record trial if your prop locks up while the model is 75' up you
  can always (maybe) put up another flight.
>
> Whether you use
  sleeves or not is a matter of choice. For me I would never try to run a 24"
  motor on an LPP without sleeves. I sometimes use sleeves in Cat 1.


  




    
     

    
    






                                                 
Received on Thu Mar 25 2010 - 14:24:56 CET