Out Of The Groove--the V-velt Groove, That Is!!  
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All Forums >> RC Airplanes >> RC Gliders, Sailplanes and Slope Soaring >> Out Of The Groove--the V-velt Groove, That Is!!
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Out Of The Groove--the V-velt Groove, That Is!! - 2/4/2002 11:45:27 AM   
rogerflies


 

Posts: 344
Joined: 1/8/2002
From: Thomasville, GA, USA
Status: offline 		Having built several winches using the venerable v-belt brake, I got tired of the delicate machining involved in the v-groove. I decided to try the flat serpentine belt found on the newer cars. I found that it works just great. So well, in fact, that I was able to cut the belt down from the original 3/4" width to 7/16". At the same time I bandsawed the ribs off to increase the contact area since I didn't machine any small grooves in the drum. Added benefits include the drum being lighter and the belt being easier to secure to the winch frame.

I've attached a photo showing the winch which is powered by a modified Chevy 350 starter equipped with dual ball bearings. It's a real puller!! The drum is 4 3/8" in diameter and holds 1500' of 120# braided nylon line.

What do you think? Is this a better way to get 'em up there?

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"New ideas in launching equipment."
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Winch - 2/4/2002 3:50:43 PM   
Ollie


 

Posts: 958
Joined: 12/8/2001
From: Punta Gorda, FL
Status: offline 		Nice job!

How fast does it rewind at the end of the flying session? Some GM starters are series wound. Without a load, series wound motors will increase their RPM without limit (until something fails).

_____________________________

Regards, Ollie

(in reply to rogerflies)
       Post #: 2

Out Of The Groove--the V-velt Groove, That Is!! - 2/4/2002 7:14:46 PM   
rogerflies


 

Posts: 344
Joined: 1/8/2002
From: Thomasville, GA, USA
Status: offline 		You're right about it turning really fast. This was a problem with it mounted on the tailgate of my pick-up because the line would whip up under the truck as I pulsed the winch. So, I came up with a cheap solution, which I call the "WinchTamer", shown in the photo. It consists of a 15' length of #14 wire spliced to two short pieces of #10 wire. The WinchTamer, which is a water cooled resistor, is connected between the solenoids and the winch when I spool the line in. Having the splices and the #14 wire submerged in water keeps them from overheating. It provides enough current to spool the line safely with a little pulsing of the switch. One of these with a shorter length of #14 wire could be used to limit the winch power for launching delicate sailplanes, or for someone not accustomed to a powerful 12-volt winch.

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_____________________________

"New ideas in launching equipment."

(in reply to rogerflies)
       Post #: 3

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All Forums >> RC Airplanes >> RC Gliders, Sailplanes and Slope Soaring >> Out Of The Groove--the V-velt Groove, That Is!!
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