Hi Keith,
Suggest u correspond with Kurt, K7NV. He's the expert on prop pitches these
days.
k7nv@contesting.com
73!
Frank
W3LPL
(p.s. ask Kurt what the owner of SteppIR uses to turn his MonstIR ...)
---- Original message ----
>Date: Tue, 24 Apr 2007 09:30:44 -0500
>From: "Keith Dutson" <kdutson@sbcglobal.net>
>Subject: Re: [TowerTalk] Mast slipping
>To: <K7LXC@aol.com>, <towertalk@contesting.com>
>
>Thanks for posting the flaws again.
>
>Looks like one of the recent improvements is removal of the dimples. Both
>surfaces (front and back) on the mast clamps are now ground off at the
>factory.
>
>Since the mechanism has also been strengthened, this rotator may finally be
>up to the task to rotate large arrays. However, thanks to comments from
>Frank W3LPL, I do not intend to be the first to find out. Instead of using
>it to turn the top-of-stack 4el 40 meter Yagi, I think it will do nicely
>turning the top-of-stack 5 el 20 meter Yagi instead.
>
>Now to look into a prop-pitch and suitable controller...
>
>73, Keith NM5G
>
>
> _____
>
>From: K7LXC@aol.com [mailto:K7LXC@aol.com]
>Sent: Monday, April 23, 2007 7:05 AM
>To: towertalk@contesting.com; kdutson@sbcglobal.net
>Subject: Re: [TowerTalk] Mast slipping
>
>
>In a message dated 4/22/2007 7:11:18 P.M. Pacific Daylight Time,
>towertalk-request@contesting.com writes:
>
>> Frank,
>
>> Are you saying the Orion has a basic design flaw that no amount of
>strengthening or improvement will correct? If so, please elaborate.
>
> Did you miss my recent 4-20 Orion post where I spelled out exactly
>what the design flaws were? Here it is again:
>
>> It's an Orion design flaw, the mast clamp has 2 problems. First, the
>
>surface where the nuts and bolts seat are dimpled - not flat. Over time,
>the
>wind motion causes the washers to pound the dimples flat, thus loosening up
>
>the
>nuts; then the mast is loose and starts moving. The problem can be
>eliminated
>by milling or grinding those surfaces flat.
>
>> Secondly only 2-3 teeth per surface of the clamp actually contact the
>mast,
>resulting in very little clamping. Then you get the teeth being worn down
>as
>the mast moves back and forth and it loosens some more.
>
>> You can re-tighten everything and it'll probably be good for a couple of
>
>years. For a 4L SteppIR, you can also pin the mast. Pinning works for
>everything except a MonstIR which tends to shear them off.
>
>Cheers,
>Steve K7LXC
>TOWER TECH
>
>
>
>
> _____
>
>See what's free at AOL.com <http://www.aol.com?ncid=AOLAOF00020000000503> .
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