[TowerTalk] Rotor Selection Advice Wanted - Heavy Duty

[W3YY - Bob]

This is not meant as a direct reply to any of the previous posts, but in
reading this thread it prompted me to share the following experience I had.


I have a F12 Magnum 240N 2-el 40-meter beam at 120ft rotated with a Yaesu
G-2800DXA.  This fall the factory supplied pin bolt was sheared.  We did
have some significant wind storms in the fall, but it's not clear which one
caused the damage.  After the pin bolt sheared there was some slippage
between the mast and the remaining clamp assembly, but not so much as to
cause any further damage until I discovered the problem and replaced the pin
bolt.

I had thought it would be impossible for a pin bolt to shear except in
exceptional circumstances, but now I have a new appreciation for either the
torque forces up there or the weakness of bolts, HI.

The fact that G-2800DXA did not fail before the forces sheared the bolt is
impressive to me.

73, Bob - W3YY

 
-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of john at kk9a.com
Sent: Wednesday, January 10, 2007 2:16 AM
To: TOWERTALK at contesting.com
Subject: Re: [TowerTalk] Rotor Selection Advice Wanted - Heavy Duty

If you install the Yaesu G-2800DXA per the manufacture's instructions and
nothing is broken, it is impossible for the mast to slip.

John KK9A



To: donovanf at starpower.net, towertalk at contesting.com,Gary.Stone at va.gov
Subject: Re: [TowerTalk] Rotor Selection Advice Wanted - Heavy Duty
From: "White, Howard" <drpaper at kleega.com>
Date: Mon, 8 Jan 2007 13:22:24 -0800
List-post: <mailto:towertalk at contesting.com>

I do not know where he comes up with that hearsay nonsense...

The Yaesu G2800DXA does not have any of these alleged problems...

I have MonstIR#1   - it has been up for 2 years...

Far longer than any other MonstIR!!!

I am about 1 mile from the Pacific Coast about 600' ASL with a clear shot at
every wind that comes from Japan.

Using a Yaesu G-2800DXA...NO SLIPPAGE on the rotor...

I chose the G-2800DXA because it had the best braking rating of all
rotors...

And it does not seem to have any problem whatsoever turning the array.

http://www.ky6la.com/monstir_project.htm

__________________________________________________________
Howard S. White Ph.D. P. Eng., VE3GFW/K6  ex-AE6SM  KY6LA
Website: www.ky6la.com
"No Good Deed Goes Unpunished"
"Ham Antennas Save Lives - Katrina, 2003 San Diego Fires, 911"

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of
donovanf at starpower.net
Sent: Monday, January 08, 2007 11:09 AM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Rotor Selection Advice Wanted - Heavy Duty

Rick,

As far as I'm aware, the 2800 has been proven time-and-again to be incapable
of holding a MonstIR in even a moderate wind.  I suggest you avoid
needlessly repeating this mistake, and implement your prop-pitch solution
right from the start.

73!
Frank
W3LPL 

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk