- #1
Rreeves0802
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This is a practical physics question from a sailboat cruiser in Hawaii.
My name is Randall. Sadly, from the perspective of this forum, I was an English major, and so may not know the best way to frame the following question.
I will soon be sailing solo from Hawaii to Alaska. The proliferation of debris in the north Pacific due to the Japanese tsunami a year ago has encouraged me to purchase a radar unit for my boat that will help me keep from colliding with some of it. The radome (radar dome) mounting bracket delivered does not fit my mast, so I am having to fashion a bracket out of wood and fibergass (my location is pretty remote...can't just run down to the marine store and exchange the item).
I don't know how strong to make the bracket.
The radome weighs 20lbs. It has the general look of a wedding cake: is 19 inches around by 11 inches high. It will be mounted to the front of the mast at 15 feet above the water.
This is what the radome looks like: lowrance.com/Products/Marine/Broadband-Radar/3G-Broadband-Radar/
For perspective, this is a picture of a smaller radome mounted on a boat exactly like mine and in roughly the same position:
voy.com/119861/3947.html
Boats at sea move, sometimes violently. At dock, my bracket would only need to hold up 20lbs. But if, at 15 feet above the water, the radome is accelerating from 0 to, say, 10mph in 1 second as the mast and boat swing around in reaction to the waves, how does that effect the "weight" of the radome and/or the force on my bracket. Is the force at the above figures the rough equivalent of a factor of 10, I.e.200 pounds of "weight" on the bracket, or is it much more? What if the acceloration is 20mph in the same 1 second?
Except for the weight of the radome, these numbers are guesstimations. What I need is a sense of range. 20 to 200. Or 20 to 2000. I.e does the bracket need to be able to withstand 200 or 2000lbs of pressure.
The question is serious. If my bracket fails, it could take the mast with it, this while I'm mid ocean. Not a happy prospect.
Many thanks in advance,
Randall
Aboard MURRE
Nawiliwili Harbor, Kauai
murreandthepacific.wordpress.com
My name is Randall. Sadly, from the perspective of this forum, I was an English major, and so may not know the best way to frame the following question.
I will soon be sailing solo from Hawaii to Alaska. The proliferation of debris in the north Pacific due to the Japanese tsunami a year ago has encouraged me to purchase a radar unit for my boat that will help me keep from colliding with some of it. The radome (radar dome) mounting bracket delivered does not fit my mast, so I am having to fashion a bracket out of wood and fibergass (my location is pretty remote...can't just run down to the marine store and exchange the item).
I don't know how strong to make the bracket.
The radome weighs 20lbs. It has the general look of a wedding cake: is 19 inches around by 11 inches high. It will be mounted to the front of the mast at 15 feet above the water.
This is what the radome looks like: lowrance.com/Products/Marine/Broadband-Radar/3G-Broadband-Radar/
For perspective, this is a picture of a smaller radome mounted on a boat exactly like mine and in roughly the same position:
voy.com/119861/3947.html
Boats at sea move, sometimes violently. At dock, my bracket would only need to hold up 20lbs. But if, at 15 feet above the water, the radome is accelerating from 0 to, say, 10mph in 1 second as the mast and boat swing around in reaction to the waves, how does that effect the "weight" of the radome and/or the force on my bracket. Is the force at the above figures the rough equivalent of a factor of 10, I.e.200 pounds of "weight" on the bracket, or is it much more? What if the acceloration is 20mph in the same 1 second?
Except for the weight of the radome, these numbers are guesstimations. What I need is a sense of range. 20 to 200. Or 20 to 2000. I.e does the bracket need to be able to withstand 200 or 2000lbs of pressure.
The question is serious. If my bracket fails, it could take the mast with it, this while I'm mid ocean. Not a happy prospect.
Many thanks in advance,
Randall
Aboard MURRE
Nawiliwili Harbor, Kauai
murreandthepacific.wordpress.com