Re: Wind hard or not so hard?

From: <Warthodson_at_aol.com>
Date: Mon, 18 Nov 2013 09:10:02 -0500 (EST)

If I am trying to wind a motor to as close to "max." as I can, without breaking it, I always wind to torque not turns.
One other comment. If I wind a motor to "max." I have about a 50% chance of being able to wind it to "max." a second time without it breaking.
Gary H


-----Original Message-----
From: Don Slusarczyk <don_at_slusarczyk.com>
To: Indoor_Construction <Indoor_Construction_at_yahoogroups.com>
Sent: Sun, Nov 17, 2013 11:18 pm
Subject: Re: [Indoor_Construction] Wind hard or not so hard?



  
    
                  
        
So you guys wind only to a torque and do not care about actual turn count? I find that amazing. I am just the opposite, I go by turn count then back off to a torque level to regulate the height. So If I want say 1750 launch turns on a motor that can take 2000 I may wind to1850 then back off some turns to get my desired launch torque. If the motor could take 2000 turns, I would not wind to 2000 then back off 250 to 1750. I typically only wind (by turns) past my target minimum required launch turns then back off some to knock off some of the torque. Also any new motor I never fly use until broken in. I take a freshly made motor lube it up generously then say if it would take 2000 turns I wind it to ~1750 or so then unwind and measure the length to see if it stretched, a 14": loop would be like ~14.7" after a break in then I relube and then use that for my flights. Once I do that process and the motor takes a stretch set, the motor is rather consistent over the windings for the day if you done push it too hard. The only time it starts to deviate is if I really push the motor hard multiple times in a row. If I find my model is needing near max turns on each flight and I wind to near max turns on each flight and then say it hangs up, and then I wind max again and hang again, then do it again I find the motor will sag and drop off on these subsequent windings. So I then set that motor aside for a while or make up a new one. Sometimes the "sagging" model will do equal time from less height sometimes it does less time as the model will not climb as high. I noticed this on Nocal a lot as the rules require 3 of 3 flights so often in a contest you take all three in a row and if you are leaning on the motor the first flight, the second flight will be within a few seconds but the third flight will always not climb as high and will either so the same time or sometimes less so on the third flight I usually do not back off as much as I know this will happen. I can usually also tell it is sagging when I start to back off. A sagging motor will drop torque quickly with a few unwinds which is something it did not before. I may have needed 100 unwinds to get my torque but after 3 or 4 full winds of the rubber only 50 backoff gets the same torque then I know the motor is toasted for the day.
      
      Don
    
    
                       
            
    
             

  
Received on Mon Nov 18 2013 - 06:10:04 CET