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General control line discussion => Open Forum => Topic started by: Fred Cronenwett on May 11, 2015, 08:45:10 PM

Title: pull test scale source?
Post by: Fred Cronenwett on May 11, 2015, 08:45:10 PM

Has anyone purchased one of the pull scales that we use at our contests that can pull over 100 lbs? I am looking for one of the those long rectangular pull scales that spring based

Looking for a source for those...

thanks
Fred

Title: Re: pull test scale source?
Post by: Randy Cuberly on May 11, 2015, 08:57:07 PM

Fred,
This site carries up to 110 lbs and they are cheap.

There are other sites that carry higher weights...some are not so cheap!

http://www.amazon.com/s/?ie=UTF8&keywords=fish+weight+scale&tag=mh0b-20&index=aps&hvadid=3527198147&hvqmt=e&hvbmt=be&hvdev=c&ref=pd_sl_7b0ulohi5u_e

Randy Cuberly

Title: Re: pull test scale source?
Post by: Howard Rush on May 11, 2015, 09:05:17 PM

Quote from: Fred Cronenwett on May 11, 2015, 08:45:10 PM

I am looking for one of the those long rectangular pull scales that spring based

That would sorta complement Fred's vacuum tube ESC.

Title: Re: pull test scale source?
Post by: Paul Smith on May 12, 2015, 07:26:20 AM

The weight stack with a pulley follows the "honest weight no springs" concept.  As mentioned elsewhere, the spring type fish scale relies upon the operator to see when the target force has been achieved and slack off before destroying the model.

Title: Re: pull test scale source?
Post by: Tim Wescott on May 12, 2015, 09:04:03 AM

Quote from: Fred Cronenwett on May 11, 2015, 08:45:10 PM

Has anyone purchased one of the pull scales that we use at our contests that can pull over 100 lbs? I am looking for one of the those long rectangular pull scales that spring based

Looking for a source for those...

Try a farm & feed store -- those things are often used for weighing hay and other feed for animals.

I've got one of those (filched from the wife's barn) and a digital fish scale.  They both work.

Title: Re: pull test scale source?
Post by: sleepy gomez on May 12, 2015, 03:29:48 PM

I made one using a clicker type, adjustable torque wrench.  The control handle is hooked to the end of the torque wrench handle. Set to the desired pull there is an audible click when the pull is reached. This click can also be felt at the plane. The square drive end of the wrench attached to a socket welded to a plate.  This type can be used with only the person holding the plane. 

Title: Re: pull test scale source?
Post by: Howard Rush on May 12, 2015, 11:50:22 PM

Quote from: sleepy gomez on May 12, 2015, 03:29:48 PM

I made one using a clicker type, adjustable torque wrench.  The control handle is hooked to the end of the torque wrench handle. Set to the desired pull there is an audible click when the pull is reached. This click can also be felt at the plane. The square drive end of the wrench attached to a socket welded to a plate.  This type can be used with only the person holding the plane. 

Cool idea.  Thanks.

Title: Re: pull test scale source?
Post by: Motorman on May 13, 2015, 09:33:55 AM

Quote from: Paul Smith on May 12, 2015, 07:26:20 AM

As mentioned elsewhere, the spring type fish scale relies upon the operator to see when the target force has been achieved and slack off before destroying the model.

Amazing how some can't accomplish that simple task.