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Old 09 January 2013, 08:54   #1
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Installing boat lightpole

I'm just about to order a lightpole made in 1 1/4 marine grade stainless steel tubing to my own design, 6' high (from transom) which is collapsible (Protex catches). The base will have a flange or base plate which can be secured to the transom. If you look at this picture of my Ribcraft 4.8m - it will be placed on the right hand side between the transom leg and sponson tube.

What are your thoughts regards installation. The transom is 50mm thick. Can I get away with pre-drilled holes and use 4-6 40mm self-tappers countersunk, or is this really a bolt-through-transom job, sikaflex, etc.

The lightpole (which will also be a mount) for my Metz antenna will weigh roughly 2.5kg.

Thanks for any advice!
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Old 09 January 2013, 11:30   #2
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6 lbs, 3/4 of which is up high and unsecured, plus the weight of the installed lights and antenna. Decent amount of penduluming mass, all transmitted to the anchor point.

I would say bolt through with a backing plate. Then again, I tend to design things so they're bulletproof.

jky
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Old 09 January 2013, 11:49   #3
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Quote:
Originally Posted by jyasaki View Post
6 lbs, 3/4 of which is up high and unsecured, plus the weight of the installed lights and antenna. Decent amount of penduluming mass, all transmitted to the anchor point.

I would say bolt through with a backing plate. Then again, I tend to design things so they're bulletproof.

jky
+1 ...maybe stick some horizontal tube across the bolt holes (inside the tube) to stop the tube crushing (I've not eplained that well I don't think)
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Old 09 January 2013, 12:14   #4
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Quote:
Originally Posted by jyasaki View Post
6 lbs, 3/4 of which is up high and unsecured, plus the weight of the installed lights and antenna. Decent amount of penduluming mass, all transmitted to the anchor point.

I would say bolt through with a backing plate. Then again, I tend to design things so they're bulletproof.
Thanks jyasaki. The Metz antenna is really lightweight, and the 12v LED light is too, but I take your point about the lightpole being high and unsecured and bolting it is probably the best way to avoid having to do remedial work after installation. I can use stainless steel penny washers for the outside of the transom.
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Old 09 January 2013, 12:15   #5
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Depends really on how big the base plate is, if it extends the full height of the iner transom I would be tempted on the self tappers, If the base plate is only 4 or 5" high, then I would also put a s/s U bolt above the plate, I would have thought that should do seeing its a lightpole not a lean too.
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Old 09 January 2013, 12:18   #6
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Bolt through the transom. Someone may grab hold of the pole to haul themselves in from the water and end up ripping the self-crappers out.
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Old 09 January 2013, 12:27   #7
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+1 ...maybe stick some horizontal tube across the bolt holes (inside the tube) to stop the tube crushing (I've not eplained that well I don't think)
Cheers Peter. Hightower did this with his lightpole - which I've used as part of my specification with the manufacturer. This looks pretty robust don't you think?

Original thread here: Boat light-pole - ideas?
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Old 10 January 2013, 10:22   #8
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+another for the throu bolting. I built an extension pole for my A- frame to get proper 1M sepration..... I'm now on my MK3 pole.

As you appear to have an eye screwed into your transon knee, could you through bolt that on the opposite side? Means your transom has one (or 4) less hole(s).
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Old 10 January 2013, 13:30   #9
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If you plan to take it off for storage etc why not have it with a G clamp type thing over the top of the transom?

No holes at all then
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Old 10 January 2013, 14:16   #10
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if you plan to take it off for storage etc why not have it with a g clamp type thing over the top of the transom?

No holes at all then
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