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TWL: Radar mast relocation

R
rmcleran@ix.netcom.com
Tue, Jan 23, 2001 12:25 AM

Sanderling's radar mast is a fiberglass structure, rectangular in
cross-section, and mounted on the top deck just aft of the top-most
steering station and seats. Struts support it aft, attached to the same
deck, with another strut off to the port side, also attached to the same
deck. There spreaders on which the flag halyards and spreader lights are
located, and the top-most white running light is on the top. It also
supports the platform on which the radar and TV antenna (not a dish) is
located.

It takes up a lot of room in its present configuration, and there is no
boom attached which might be used for a steadying sail or a cargo lift.
Because of its supports, the whole lashup fairly precludes the use of
the aft part of the  top deck and the seat which is built into the aft
part of the safety rails.

I'm thinking about removing this mast, and replacing it with a more
traditional trawler mast stepped on the boat deck just behind the
top-most deck. On the new mast I'd have to include a running light as
well as spreader lights, radar, and powered TV antenna.

I'd want to update the radar in any event, so moving the cable wouldn't
be a big deal. One of my concerns is the support structure for the new
mast - it might interfere with access to the top-most deck and would
certainly eliminate using the boat deck for any lounging purposes.

Do any of you have any thoughts about the pros and cons of doing this?
Has anyone done this? Should I consult a naval architect prior to
undertaking this project, or can I rely on the recommendations of a very
competent shipyard (Washburns in Solomons MD which has a great trawler
reputation)?

--
Bob McLeran                              rmcleran@ix.netcom.com
M/V "Sanderling"                        Docked at Point Patience Marina
Hailing port: Wianno MA                      Solomons, MD
Hampton 35 Trawler

Sanderling's radar mast is a fiberglass structure, rectangular in cross-section, and mounted on the top deck just aft of the top-most steering station and seats. Struts support it aft, attached to the same deck, with another strut off to the port side, also attached to the same deck. There spreaders on which the flag halyards and spreader lights are located, and the top-most white running light is on the top. It also supports the platform on which the radar and TV antenna (not a dish) is located. It takes up a lot of room in its present configuration, and there is no boom attached which might be used for a steadying sail or a cargo lift. Because of its supports, the whole lashup fairly precludes the use of the aft part of the top deck and the seat which is built into the aft part of the safety rails. I'm thinking about removing this mast, and replacing it with a more traditional trawler mast stepped on the boat deck just behind the top-most deck. On the new mast I'd have to include a running light as well as spreader lights, radar, and powered TV antenna. I'd want to update the radar in any event, so moving the cable wouldn't be a big deal. One of my concerns is the support structure for the new mast - it might interfere with access to the top-most deck and would certainly eliminate using the boat deck for any lounging purposes. Do any of you have any thoughts about the pros and cons of doing this? Has anyone done this? Should I consult a naval architect prior to undertaking this project, or can I rely on the recommendations of a very competent shipyard (Washburns in Solomons MD which has a great trawler reputation)? -- Bob McLeran rmcleran@ix.netcom.com M/V "Sanderling" Docked at Point Patience Marina Hailing port: Wianno MA Solomons, MD Hampton 35 Trawler
S
shaunsweeney@telus.net
Tue, Jan 23, 2001 4:26 AM

A couple of points come to mind Bob:

  1. Don't forget, the radar antanae is designed for a fixed length of wiring
    to it.  At least that's the case wt my Decca.  If you have to shorten or
    lengthen the wire, you will have to consult a qualified radar tech and he
    will probably have to make adjustments to your set.

  2. The latest Passagemaker has a good article on positioning various antanae
    but also on the importance of the quality of wiring.  Suggest you review the
    article.

Shaun aboard Rana III

A couple of points come to mind Bob: 1. Don't forget, the radar antanae is designed for a fixed length of wiring to it. At least that's the case wt my Decca. If you have to shorten or lengthen the wire, you will have to consult a qualified radar tech and he will probably have to make adjustments to your set. 2. The latest Passagemaker has a good article on positioning various antanae but also on the importance of the quality of wiring. Suggest you review the article. Shaun aboard Rana III