Re: Re: Hints for Cat IV LPP flying from Bill Gowen on 2010-03-26 ([Indoor

From: Bill Gowen <wdgowen_at_gmail.com>
Date: Thu, 25 Mar 2010 19:56:00 -0400

Yes but that is actually some of the soft stuff that doesn't work as well. The good kind that I've had came in an assorted size pack. There were only 2 pieces that were usable for LPP sleeves in the pack. I think the size is about 3/32" and the length is whatever turns you on at the time. I think somewhere in the 1/4" to 1/2" range would be about right. The results will tell you if you've got it right.

One thing that hasn't been mentioned is getting the sleeves on the motor. If I'm making a motor that I feel needs sleeves I'll put them on when I make the motor. If you have to put sleeves on after a motor is made then you'll probably need to make a wire tool for the job. This is a piece of wire (maybe .020") with a narrow u bend in one end and a loop on the other end for your finger. You load the sleeve over the hooked end, slide the o-ring onto the hook, then slide the sleeve down over the hook and pull it over the o-ring - without impaling your finger in the process.

For an untied motor I run one end of the rubber through the sleeve, through the o-ring and back through the sleeve. Then I repeat the same process with the other end of the rubber. This leaves the two loose ends of the rubber in the middle of the motor. I tie them together, trim if necessary and then pull one strand of the motor to move the knot against the o-ring. This will give you the setup shown in the picture.

  ----- Original Message -----
  From: Tony MATHEWS
  To: indoor_construction_at_yahoogroups.com
  Sent: Thursday, March 25, 2010 5:24 PM
  Subject: RE: [Indoor_Construction] Re: Hints for Cat IV LPP flying


  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 - 16:56:26 CET