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Re: [TowerTalk] Prop Pitch Motor

Subject: Re: [TowerTalk] Prop Pitch Motor
Reply-to: "Tower and HF antenna construction topics." <>
Date: Sun, 14 Mar 2010 23:19:49 EDT
List-post: <">>
Gene, the current draw at startup is a bunch higher than the running  
current. Sorry, don't know how much higher.
You are probably ok with the 3 #12 wires but you might want to test it on  
the ground before a final commitment.
As long as the motor starts, you will be in good shape and the extra  
voltage drop will only help slow down the start up.
The prop pitch motors were designed for 28VDC so that is probably a good  
voltage to use. The speed will be proportional to the voltage so lower than 
28  volts will slow them down a bit. They are already a tad on the slow side 
so use  your own judgement.
Gerald K5GW
In a message dated 3/14/2010 9:58:38 P.M. Central Daylight Time, writes:

What is  the maximum DC voltage used successfully/recommended for one of 
the  "small"  PPM's ?  What speed was accomplished and how was the brush  life 
at that voltage ?
I 'm building a power supply to put at the base of  the tower and can 
change the voltage from about 30 to 48 volts in 6 volt  steps. Cable to PPM 
be 100 feet of 3-#12's. I'm figuring about 0.5 ohms  and about a ten amp 
demand  i.e. a 5 volt drop.
Any suggestions will  be greatly appreciated.
Gene /  W2LU

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