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Re: [TowerTalk] Prop Pitch Motor

To: "Tower and HF antenna construction topics." <>
Subject: Re: [TowerTalk] Prop Pitch Motor
From: "Gene Fuller" <>
Reply-to: "Tower and HF antenna construction topics." <>
Date: Mon, 15 Mar 2010 12:11:51 -0400
List-post: <">>
Thanks for the comments on PPM's. They pretty much fall in line with what I 
have observed over the past few decades of using them. Probably about 35 VDC 
with a 200 foot loop of # 12 should give 1/2 to 1 rpm for my LP (15 ele on 
46 ft boom). Perhaps a lilttle slow, but you know it's going to get there 
and not stall along the way. A few decades ago I runied a good PPM by giving 
it the speed modification - definitely not recommended. My feeling is that 
anyone who doesn't mind spending a few bucks would get the ideal rotation 
system by using one of Kurt's PPM's  with a Green Heron controller. All you 
would want of torque, breaking, long term reliability and convenience.
Thanks again,
Gene / W2LU

----- Original Message ----- 
From: "Gene Fuller" <>
To: <>
Sent: Sunday, March 14, 2010 10:58 PM
Subject: [TowerTalk] Prop Pitch Motor

> 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 
> will 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.
> Thanks,
> Gene / W2LU
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