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27' lowering the cockpit floor

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Old 01-12-2014 | 10:00 AM
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Default 27' lowering the cockpit floor

I'm about to embark on cutting up my cockpit floor to lower it.

My boat is a 27 vee windshield/sport.

I'd like to get some input on what has been proposed to me....
And possibly expand on other ways that this has been done......

As best I can tell the old-style is to lower the floor directly in front of the seats with boxes and hatches.

Others have lowered the entire floor from the cabin bulkhead all the way back to the engine partition behind the rear seat.
As lowering the rear seat will require new upholstery at least for the backrest and also requires additional fiberglass work, and in my case reconfiguring some of the hydraulic pumps and fuel pumps that I have mounted behind the backseat and ahead of the engines.

So the suggestion was made that I lower the floor underneath the two front seats and forward to the cabin bulkhead. This would leave what I figure to be approximately a 4 inch step across the middle of the cockpit floor...... but would also not require alterations to the rear seat as I don't believe passengers in the backseat need to sit lower.

My boat has the original seats which I desire to retain and not switch to bolsters.

Thoughts and input would be greatly appreciated
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Old 01-12-2014 | 10:06 AM
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Not sure why you would cut the floor to use sit down seats? I had a sport with sit down seats and didnt see a need. Its mainly for the guys who choose to stand and not look like a giraffe.
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Old 01-12-2014 | 10:43 AM
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Ahhhh,, But you see I too am like a giraffe!
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Old 01-12-2014 | 03:51 PM
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Mario...my seat pedestals were cut and therefore lowered. It's a nice alternative if you ask me...especially if you want to sit down.
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Old 01-12-2014 | 07:13 PM
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Originally Posted by Mario L.
Ahhhh,, But you see I too am like a giraffe!
The giraffe syndrome seems to be spreeding.
Ironhead has two sports ANACONDA & SUBLUXATOR, the later is also a vee windshield. Sparky @ Vicious marine lowered the Anacondas floor.. Ironhead is doing the Subluxatotors floor himself, hopefully he will chime in with some info. The construction pics are of the ANACONDA. floor lowering @ Vicious marine.
Attached Thumbnails 27' lowering the cockpit floor-r-k-magnum-project-031.jpg   27' lowering the cockpit floor-r-k-magnum-project-044.jpg   27' lowering the cockpit floor-r-k-magnum-project-043.jpg  

27' lowering the cockpit floor-r-k-magnum-project-038.jpg   27' lowering the cockpit floor-mag-subluxator-1.jpg   27' lowering the cockpit floor-mag-subluxator-039.jpg  

27' lowering the cockpit floor-mag-subluxator-041.jpg   27' lowering the cockpit floor-mag-anaconda-2011-1.jpg  
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Old 01-12-2014 | 07:14 PM
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I'm up in the air on lowering my floor too. Looking at the stringers and cutting them down makes me worried on the loss of strength on the cut outs. Keeping the standup bolsters in my magnum so I may stay with the original floor height. I'm 6 ft loosing three inches I'm still gonna giraffe.
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Old 01-12-2014 | 08:36 PM
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Thank you for sharing the pictures!
It seems that every picture I find the outboard stringer is kept underneath the floor.

The outboard stringer is also approximately directly below the most inboard edge of the deck. What about placing the floor onto the hull at that location with a 6 inch tall stringer mounted along the edge of the floor.
This outboard stringer would also function to create a partition behind which one could throw bumpers and docking lines. This should also allow the floor to be lowered instead of approximately 4 inches total of 6 inches?
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Old 01-12-2014 | 10:45 PM
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This cockpit sole is lowered by 4"...........that's the max before you start to give up lateral space...I added extra stringers to tie
it all together when it's glassed .........I reconfigured the bench seat by 4" to conform as well........I know this is not optimal for.
Attached Thumbnails 27' lowering the cockpit floor-img_8297.jpg   27' lowering the cockpit floor-img_8336.jpg   27' lowering the cockpit floor-img_8342.jpg  

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Old 01-13-2014 | 03:05 PM
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Mario,
I wanted to reduce the seat height so I welded a new flange and a base plate onto a stainless tube with a bore clearance size of the Magnum original seat pillar OD. I machined off the Magnum base flange , dropped the original shock mount housing into my new stainless base and bolted the two tubes together. I was able to lower the seat height through the cockpit floor to anything I wanted between 2" to 6" and still have the full shock absorbing stroke. I also added an external mounted PTFE bearing sleeve around the top of the original Magnum seat column with a bore size equal to the OD of the inner moving tube of the Magnum seat support. So the vertical shock mount is now as smooth as you would wish with a solid 1" of bearing face to ride on.

KALAAZAR
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Old 01-13-2014 | 10:02 PM
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Kalaazar do you have any photos of your seat mods? Ingenuity at its best! I am particularly interested in how you mounted the PTFE bearing sleeve and the dimensions of the sleeve, is it nylon? Thanks Jeff
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