Swim Platform Support Design
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Swim Platform Support Design
I want to construct and install a swim platform and was thinking it would be nice to NOT have knee brace supports bolted below the waterline. Does anyone have a design has all thru bolts above the waterline? I was thinking of making trianglar shaped brackets, only bolted above the waterline at the 90 deg angle. But -- I fear it may to be secure enough.
--Marshall
--Marshall
- Brewster Minton
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marshall.....what was wrong with the old one? i thought it was one of the best ive seen.
if you support it from above the braces will always be in the way. also it just seems stronger, gravity and all, to support it from below. whats a few more holes? B31 hulls look like swiss cheese anyway. we should have a contest for the most thru hulls.
if you support it from above the braces will always be in the way. also it just seems stronger, gravity and all, to support it from below. whats a few more holes? B31 hulls look like swiss cheese anyway. we should have a contest for the most thru hulls.
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Marshall,
Once you figure out a good option, please, let me know, I've got a Cabrera platform that doesn't have brackets, and I'm trying to figure out the best way to mount it. I was thinking of 4 triangle braces underneath that were made out of ss or aluminum. Has anyone seen any after market brackets?
The other idea that I have would be to get my glass man to glass some encapsulated wood triangle braces to the platform and the back of the boat..seems like he might be able to do it without having to re-paint the Alwgrip, but, would have to re-apply the bottom paint on the back.
. Thanks.
John.
Once you figure out a good option, please, let me know, I've got a Cabrera platform that doesn't have brackets, and I'm trying to figure out the best way to mount it. I was thinking of 4 triangle braces underneath that were made out of ss or aluminum. Has anyone seen any after market brackets?
The other idea that I have would be to get my glass man to glass some encapsulated wood triangle braces to the platform and the back of the boat..seems like he might be able to do it without having to re-paint the Alwgrip, but, would have to re-apply the bottom paint on the back.
. Thanks.
John.
I'll never ruin a $50 buzz with a $4 sandwich
- PeterPalmieri
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With all the mods guys do on b31s. I am surprised know one has tackled the tailgate like has been done on the shelter island runabouts. www.chmarineyachts.com
Is this structurally possible on a b31?
Is this structurally possible on a b31?
1969 31 Bertram FBC "East Wind" hull #315939
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Marshall,
Depending on your platform weight plus the occupacy weight the platform will carry, you could use above the water line brackets. But to get the verticle height needed for the load capacity, it would put the platform quite high off the water.
One it would look funny and two make ladders needed to get on the platform.
I did do one platform on a 31 long before the 31 site was up for a fisherman who wanted one that would fold up.
I designed the transom curve to straight across adapter out of (1/4 plate)stainless 2" high. Back, top and bottom and front all welded together with 8 holes drilled thru the back for 3/8 thru bolts with stainless backing plates inside the hull.
Then the owner bought a Teak straight across platform which I mounted to my transom bracket with heavy stainless hinge.
Then on each outside was a folding stainless bracket I designed copying a Deitz plotter pivot which folded in half to bring the platform up against the transom. The brackets had a pin for locking so the platform wouldn't bounce and a catch at the top of the transom for locking the thing in place.
Worked extremely well and with the stainless polished and pasivated looked good.
Depending on your platform weight plus the occupacy weight the platform will carry, you could use above the water line brackets. But to get the verticle height needed for the load capacity, it would put the platform quite high off the water.
One it would look funny and two make ladders needed to get on the platform.
I did do one platform on a 31 long before the 31 site was up for a fisherman who wanted one that would fold up.
I designed the transom curve to straight across adapter out of (1/4 plate)stainless 2" high. Back, top and bottom and front all welded together with 8 holes drilled thru the back for 3/8 thru bolts with stainless backing plates inside the hull.
Then the owner bought a Teak straight across platform which I mounted to my transom bracket with heavy stainless hinge.
Then on each outside was a folding stainless bracket I designed copying a Deitz plotter pivot which folded in half to bring the platform up against the transom. The brackets had a pin for locking so the platform wouldn't bounce and a catch at the top of the transom for locking the thing in place.
Worked extremely well and with the stainless polished and pasivated looked good.
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Maybe not economically reasonable. Still a fairly unique and interesting design.CaptPatrick wrote:That would involve a lot of real serious re-engineering of the B31 hull and transom. I'd guess about $30-50K worth... Not to mention that resell value could take a dump.
1969 31 Bertram FBC "East Wind" hull #315939
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Thanks for the ideas!
Giff -- I was worried about the look of supporting the platform with cable/brackets from the top. I think yours looks great! I think I'm going for a similar design.
Randall -- my platform, supports and all, got ripped off the trans. by Katrina. (Still working on the boat in the driveway -- gives real meaning to "Suzie's Pissed"). The missing platform left nine, 1/2" holes where the bolts pulled thru. This would have sunk her if the back of the boat wasn't BARELY supported by some marshy ground. Hence my hesitation with with below waterline brackets... Thanks for the comment on the old platform -- there is a fine line between "custom" and "home made"
Again -- thanks guys
--Marshall
Giff -- I was worried about the look of supporting the platform with cable/brackets from the top. I think yours looks great! I think I'm going for a similar design.
Randall -- my platform, supports and all, got ripped off the trans. by Katrina. (Still working on the boat in the driveway -- gives real meaning to "Suzie's Pissed"). The missing platform left nine, 1/2" holes where the bolts pulled thru. This would have sunk her if the back of the boat wasn't BARELY supported by some marshy ground. Hence my hesitation with with below waterline brackets... Thanks for the comment on the old platform -- there is a fine line between "custom" and "home made"
Again -- thanks guys
--Marshall
Giff, do you varnish or oil the wood dive platform. I'm restoring the teak dive platform that was on the boat. It's sanded down and ready for refinish. I'm thinking that an oil finish will allow you to not slip. A varnish finish might be more slippery. Any advice from divers, or others?
Steve Marinak
Duchess - 1973 Sportfisherman
Duchess - 1973 Sportfisherman
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Nothing says welcome aboard like a slick swim platform...or a waxed foredeck.
Ask me how I know....
Okay...I'll tell you. A Dock Acquaintances first boat...they want to go to beach with us so they tag along in their boat. Where we anchor up is a bit of a current and they can't anchor....I tell them more scope...but they let out all the line.... and I mean all the line. So I jump in, grab the line and anchor...put it on my float..tell them to go up current and kill the motor. I swim over with anchor climb on platform which they waxed the crap out of and I proceed to slide from side to side with each passing ripple. Go in boat garb anchor and make my way up front going thru the window opening...another stupid idea...precarious place and you can't hold onto flimsy window frame...anyway soon as my foot hits the front deck I slide right down to the bow rail...again they waxed the crap out of it and being wet it's like ice...let down the anchor...set it and got off that boat ASAP.
Lesson learned...stay off bubble boats especially with bubble head crews.
Ask me how I know....
Okay...I'll tell you. A Dock Acquaintances first boat...they want to go to beach with us so they tag along in their boat. Where we anchor up is a bit of a current and they can't anchor....I tell them more scope...but they let out all the line.... and I mean all the line. So I jump in, grab the line and anchor...put it on my float..tell them to go up current and kill the motor. I swim over with anchor climb on platform which they waxed the crap out of and I proceed to slide from side to side with each passing ripple. Go in boat garb anchor and make my way up front going thru the window opening...another stupid idea...precarious place and you can't hold onto flimsy window frame...anyway soon as my foot hits the front deck I slide right down to the bow rail...again they waxed the crap out of it and being wet it's like ice...let down the anchor...set it and got off that boat ASAP.
Lesson learned...stay off bubble boats especially with bubble head crews.
Warning...on this website I could get shot for this......
Hate to admit it, but I use Cetol. 1-2 coats of the "light" per year keeps it looking nice. I agree with Captain Patrick...oil looks the best. But, Cetol is easy....and for the hours I work, I just don't have time to pamper my teak, and it does not look bad (to the non purist...get compliments all the time in my Marina---Sea Ray ville)....wears prety well also.
Hate to admit it, but I use Cetol. 1-2 coats of the "light" per year keeps it looking nice. I agree with Captain Patrick...oil looks the best. But, Cetol is easy....and for the hours I work, I just don't have time to pamper my teak, and it does not look bad (to the non purist...get compliments all the time in my Marina---Sea Ray ville)....wears prety well also.
Giff
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