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.
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Received on Thu Mar 25 2010 - 10:11:52 CET