RE: Re: Thermodynamics of rubber bands

From: Ken Achée <ken_at_achee.com>
Date: Wed, 23 Jun 2010 11:55:04 -0400

I just read in Ron William’s book , (my wonderful Father’s Day present),
that Jim Richmond recommends a 10:1 winder because it’s slower, and slower
winding seems to allow a motor to take more turns.

 

 

 

From: Indoor_Construction_at_yahoogroups.com
[mailto:Indoor_Construction_at_yahoogroups.com] On Behalf Of Bill Gowen
Sent: Wednesday, June 23, 2010 11:21 AM
To: Indoor_Construction_at_yahoogroups.com
Subject: Re: [Indoor_Construction] Re: Thermodynamics of rubber bands

 

  

Several years ago I made a comment on the FFML about how F1D flyers wind
slowly to avoid heat buildup. I got roundly attacked for advancing such a
preposterous idea to the guys who know everything about rubber.

 

----- Original Message -----

From: tim.haywardbrown_at_rocketmail.com

To: Indoor_Construction_at_yahoogroups.com

Sent: Wednesday, June 23, 2010 6:40 AM

Subject: [Indoor_Construction] Re: Thermodynamics of rubber bands

 

  

> Temperature affects the elasticity of a rubber band in an unusual way.
> Heating causes the rubber band to contract, and cooling causes
> expansion.

Don't F1B flyers use heating jackets to keep their (wound) motors warm on
cold flying days? Does that make the rubber contract? And what does that do
to the torque?
Tim
Received on Wed Jun 23 2010 - 09:55:37 CEST