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Updated Type 45
http://www.shipbucket.com/forums/viewtopic.php?f=12&t=6360
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Author:  erik_t [ April 20th, 2018, 12:54 pm ]
Post subject:  Re: Updated Type 45

Does anybody know the nature of the quartet of diagonal poles on the 'shoulders' of the SAMPSON dome? I've often wondered about this.

Author:  MihoshiK [ April 20th, 2018, 1:04 pm ]
Post subject:  Re: Updated Type 45

erik_t wrote: *
Does anybody know the nature of the quartet of diagonal poles on the 'shoulders' of the SAMPSON dome? I've often wondered about this.
I assume they're antennas, but what for I have no idea.

Author:  erik_t [ April 20th, 2018, 2:04 pm ]
Post subject:  Re: Updated Type 45

Some sort of active sidelobe monitoring? But they seem in structure and form much more like a VHF antenna - there's little to indicate to me there's any S-band 'nub' on the end.
large image
And if they were for this purpose, why not have them either at the center of the antenna in height, or duplicate them near the bottom of the array? And what's the deal with the very similar-looking non-rotating poles below the radar?

It looks as much as anything like a severely height-limited set of lightning rods, but this seems silly... doesn't it?

Furthermore, should we make any note of Artisan's somewhat similar bunny-ears?

Author:  erik_t [ April 20th, 2018, 2:14 pm ]
Post subject:  Re: Updated Type 45

:lol: :lol: :lol:

I'll be god damned, that's exactly what they are.

[ img ]

From Protecting Electronic Equipment in Composite Structures Against Lightning, Ph.D. Thesis of one Mihai Alexandru Blaj, Centre for Telematics and Information Technology 2015.

PDF link

Author:  MihoshiK [ April 20th, 2018, 2:29 pm ]
Post subject:  Re: Updated Type 45

erik_t wrote: *
Some sort of active sidelobe monitoring? But they seem in structure and form much more like a VHF antenna - there's little to indicate to me there's any S-band 'nub' on the end.
large image
And if they were for this purpose, why not have them either at the center of the antenna in height, or duplicate them near the bottom of the array? And what's the deal with the very similar-looking non-rotating poles below the radar?

It looks as much as anything like a severely height-limited set of lightning rods, but this seems silly... doesn't it?

Furthermore, should we make any note of Artisan's somewhat similar bunny-ears?
I read somewhere that a lot of ARTISAN tech is derived from SAMPSON, so those things might very well serve a similar purpose. What that purpose is though...

Edit:

Argh. Lightning rods. Oh well.

Author:  erik_t [ April 20th, 2018, 2:41 pm ]
Post subject:  Re: Updated Type 45

I recommend reading, or at least skimming, the paper. One interesting note is that we ought to try to represent segmented lightning diverters on the satcom dome on I-Mast, as in aviation practice.

[ img ][ img ]

Author:  MihoshiK [ April 21st, 2018, 8:36 am ]
Post subject:  Re: Updated Type 45

erik_t wrote: *
I recommend reading, or at least skimming, the paper. One interesting note is that we ought to try to represent segmented lightning diverters on the satcom dome on I-Mast, as in aviation practice.

[ img ][ img ]
Thanks for the link. This is interesting reading.

Author:  Hood [ April 21st, 2018, 9:31 am ]
Post subject:  Re: Updated Type 45

That is interesting, I had never realised that. I just assumed they were an antenna of some description.

Author:  waterwings [ April 22nd, 2018, 10:19 pm ]
Post subject:  Re: Updated Type 45

[ img ]

general drawing husbandry. That's interesting about the lightning rods ... I guess a solid strike would fry SAMPSON pretty terminally! :roll:

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