Rubber testing: Chiming In

From: John Berryman <wordguy1950_at_yahoo.com>
Date: Thu, 8 Nov 2012 12:40:53 -0700

Don't know how many other cheapskates there are out there, but I'd be
interested in seeing a comparison of "real" rubber lube to some of the "just
as good - no kidding" materials that I hear about from time to time, e.g.,.
Armorall and its various clones, etc.

 

I used to fly OD FF with a wake flyer who did a lot of testing so I have the
sense that you're embarking on quite a journey and may find that a study of
alternate lubes may simply insert too many variables into the equation given
the amount of time you have available to you.

 

 

 

From: Indoor_Construction_at_yahoogroups.com
[mailto:Indoor_Construction_at_yahoogroups.com] On Behalf Of
mkirda_at_sbcglobal.net
Sent: Thursday, November 08, 2012 12:31 PM
To: Indoor_Construction_at_yahoogroups.com
Subject: [Indoor_Construction] Rubber testing

 

  

Greetings.

It was suggested to me that I produce torque curves for the various batches
of rubber I have available to me.

I am not really finding anything to guide me on doing this. Making this up
as I type...

I assume that I should standardize on a given loop size and cross-section.
I'll likely use something similar to F1D motors, so .6 grams, ~0.053" width.
Make up several of each rubber type.

Use the digital torque meter and a bracket for the winder so the rubber
length is consistent. 10" from hook to hook is about correct.

Stretch 5x for 5 minutes, let relax a bit, then wind to breakage for max
torque and turns.

Wind to 70%, let sit for a couple minutes, then back off and rest for ten
minutes.

Wind to .5 oz/in or so(90%?), then back off 30 turns and record the torque
measurements.

I currently use the FAI Sil-slick lube. Should I try others?

Regards.
Mike Kirda
Received on Thu Nov 08 2012 - 11:40:58 CET