Re: Fwd: [RCSE] re:contest launch equipment vs large models HOW?

[Mike Lachowski]

F3b winches are meausred using a clamp on amp meter and a volt meter 
with the winch drums locked. This measures the stall current.Divide 
the battery voltage just before the test by the current to get an 
approximation of the overall resistance of the winch/battery combo. And 
winch batteries are all similar in CCA rating which is a good 
approximation of thier internal resistance.  Get a 1000A meter.


Unknown results with the different batteries.   Quality of the 
connection to the  battery can have a significant effect as can the 
guage of the battery cable and cable length.   With a FLS, you're 
probably only dealing with 10-12 milliohms total.   F3b is over 20.


Lee Cox wrote:

Question??
  How can I/you setup say six winches to be the same?? say we have six of the 
winch Doctors winches, all with real balls that can be timed. How can you meter 
them to all be the same?? do they have to be under a load when checking them?
  all of them are 12 volts.  sum are with single 12 volt batteries and others 
with two 6 volt batteries.??
  


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Fwd: [RCSE] re:contest launch equipment vs large models HOW?

[Lee Cox]

Question??
  How can I/you setup say six winches to be the same?? say we have six of the 
winch Doctors winches, all with real balls that can be timed. How can you meter 
them to all be the same?? do they have to be under a load when checking them?
  all of them are 12 volts.  sum are with single 12 volt batteries and others 
with two 6 volt batteries.??
  Lee

Daryl Perkins <[EMAIL PROTECTED]> wrote:
  Date: Thu, 20 Dec 2007 14:12:07 -0700
From: Daryl Perkins <[EMAIL PROTECTED]>
Subject: [RCSE] re:contest launch equipment vs large models
To: [EMAIL PROTECTED]
CC: Soaring@airage.com

Mike Smith pretty much hit the nail on the head. The problem isn't the
line. The problem isn't the size of the model. Our TD style winches are
unnecessarily strong. I'd love to see the winches restricted at major
contests. 

I'm always going to fly large wingspan models at an UNLIMITED thermal
duration contest. I like the way they perform. Period. Sorry, but my
newest model is 3.9M or 153.5". It wasn't designed for F3J. It was
designed for US style UNLIMITED thermal duration.

I often hear CD's complain about guys launching hard. I understand your
need to keep the contest moving. But blaming the competitor for being
competitive U... it's a CONTEST!!! We're competing. You can't
expect a competitor to back off on his competitive spirit. He needs to
be allowed to do whatever he feels he needs to do to gain a competitive
advantage. 

Using the line as the "weak link" is not only unfair, it's dangerous.
Limiting winch power is a great way to guarantee winch equality across
the board. Visalia's winches are unbelievably weak, and they have very
few line breaks. SWC winches are usually pretty strong, but are
inconsistent from one winch to the next, and change over the course of
the day. The NATS has the strongest winches I've ever used, and they use
rope line to keep things going. I know... the darn things ruined a
perfectly good Insanity. 

Don't limit the models. Don't limit the line size or perceived breaking
strength. Limit the available winch power, and you'll begin to see
models optimized for that available power. 

Darylperkins.com LLC.
1600 McCulloch Blvd. 5B
Lake Havasu City, AZ 86403

www.darylperkins.com









   
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