Re: Re: Hints for Cat IV LPP flying from Bill Gowen on 2010-03-24 ([Indoor

From: Bill Gowen <wdgowen_at_gmail.com>
Date: Wed, 24 Mar 2010 17:17:27 -0400

Sorry if this has already been discussed but are you using sleeves?

As far as a full motor having less power - how did you determine that? Are you taking torque readings while unwinding the motor? It doesn't make sense that a full motor would have less initial power than a partial motor unless knots are dragging somewhere. A full motor wound to the same maximum torque and backed off to the same launch torque should deliver the same launch torque (power in your terms) as the partial motor but more importantly it should do it for much longer. For example the number of unwinding turns from .7 in-oz to .5 in-oz in the full motor should be six times as many as in the 1/6 motor. This is why the whole partial motor concept works.

Another potential problem is if the motor is new and the rubber is still stretching your .7 in-oz of launch torque may really be a lot less by the time you get the motor on the model.

None of this is intended to sound preachy. I'm just trying to figure out where you are in the learning curve.

  ----- Original Message -----
  From: ykleetx
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Wednesday, March 24, 2010 3:04 PM
  Subject: [Indoor_Construction] Re: Hints for Cat IV LPP flying



> That's a very good time if you can convert it in Cat IV. Do you realize how few flights of 15:40 flights have been made in any contest?

> But I didn't catch why you scrapped that direction to go with 1/6 motors to test for 153' ceiling.
> Mark F1diddler

  I looked at the winning times at USIC in Johnson City and saw that 15:00 is a good time there. Because at JC the ceiling is 115', I thought the 150' at Tustin would require substantially more time. But basically, I'm pretty ignorant and just experimenting to better understanding the performance envelope.

  So this means the 3:02 with the 0.5g 1/6 motor would be a really good time, if I can convert it to the full 3.0g motor. I was wondering if there is a different winding technique for a 24" motor hung between 9" of space.


Received on Wed Mar 24 2010 - 14:17:45 CET