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Offline RedOctober89

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Honeycomb Floor
« on: September 04, 2018, 03:34:32 PM »
No, not the cereal..

I am thinking of doing the floor in my CV23 with that honeycomb Nida-Core stuff. Looking to cut down on some weight of the beast.

I am looking for any advice or experience with it?

Do I need to lay glass on the bottom before fastening to stringers? Then glass the top?
Do I screw to the stringers or just use cabosil/resin mix?
How far apart can the floor 'joists' be to maintain a rigid floor?
I do plan to fill the floor with foam, other than the center section where the tank sits.

What happens if I drop a water ski, or have a hard heel landing on the floor, is it as forgiving as plywood?

Any help would be appreciated!

Thanks!!
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Andrew C.
1989 Glastron Carlson 23 CSS 350 Mag - Red October
Follow the project on Instagram: redoctober89

Offline Hyperacme

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Re: Honeycomb Floor
« Reply #1 on: September 04, 2018, 04:01:17 PM »
Wondering same thing ..

Don't think you would need anything on bottom, won't rot like wood ..
EDIT … Glass both sides / as per Express Composites  .. EDIT

After a layer of fiberglass and carpet on top of that, should be pretty strong.

Doug C. said he used PVC under seats / anchor points.
Think Chad used aluminum plates.

I planed on using  cabosil / resin mix on floor to hull joint and screwed to stringer.
5200 maybe ?

My plan .. Unless someone says otherwise ..
Also I haven't talked to Express composite yet .. I would go with what they say.
« Last Edit: September 04, 2018, 04:21:11 PM by Hyperacme »
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Offline Hyperacme

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Re: Honeycomb Floor
« Reply #2 on: September 04, 2018, 04:05:52 PM »
I'm reading Chad's thread now …
http://forum.cgoamn.com/index.php?topic=5388.0
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Offline RedOctober89

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Re: Honeycomb Floor
« Reply #3 on: September 04, 2018, 06:16:53 PM »
Ah lots of good information in that thread - thank you!

Will have to do some thinking on the seats, might be able to do wood and attach directly to stringers, cut composite floor around and glass over..
Now your carpet raises another question, I am hoping to do a snap in, I wonder how well screws would hold in that stuff? Not like they would have to hold much though..


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Andrew C.
1989 Glastron Carlson 23 CSS 350 Mag - Red October
Follow the project on Instagram: redoctober89

Offline carlsoncvx18

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Re: Honeycomb Floor
« Reply #4 on: September 04, 2018, 08:11:57 PM »
Back in the day when I worked for the airlines as a mechanic.

The floor boards were made from the honey comb material.

The fasteners going thru or attaching we're done with inserts that were glued in with a 2 part epoxy using a special tip on the end of the tube that would fill the cavity around the https://d2dslulmm3ln9j.cloudfront.net/national-aerospace-standard-nas1832-3-3-insert.jpg
« Last Edit: September 04, 2018, 08:13:38 PM by carlsoncvx18 »
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1987 CVX18.     1968 Glastron alpha sail boat
1977 GT150
1986 CV23
1984 Intimiadator
1981 CV27
1969 V-180 fundeck

Offline V153

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Re: Honeycomb Floor
« Reply #5 on: September 05, 2018, 02:13:58 PM »
You need to laminate both sides to give it strength. We used biax on the bottom, and a layer of mat on top. PVC board backer for hot foot, seat, fuel tank, and battery mounts. Just under 2' wide. No flex whatsoever. And it's only 3/8".
« Last Edit: September 05, 2018, 02:19:01 PM by V153 »
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'81 C500_given away, bought back_75.1 mph
'81 Baja 15SS_140 Frankenrude_66.7 mph
'70 something SpeedCraft_(Allison 16R Clone)_69.0 mph
'79 CVZ19_given away
'71 V153_54.8 mph_wrecked


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Offline RedOctober89

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Re: Honeycomb Floor
« Reply #6 on: September 05, 2018, 03:30:08 PM »
Okay! Wow a 2' span using 3/8" is pretty impressive!

Are those PVC boards on the underside once installed, so you screw/fasten through the honeycomb into the PVC? Or other way around?

Thanks!
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Andrew C.
1989 Glastron Carlson 23 CSS 350 Mag - Red October
Follow the project on Instagram: redoctober89

Offline Hyperacme

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Re: Honeycomb Floor
« Reply #7 on: September 05, 2018, 04:57:42 PM »
WOW .. To much work ..
I going with the ply !

4 ft. x 8 ft. Aspen Osb Sheathing Board
Under $10 at Home Depot !
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Offline Hyperacme

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Re: Honeycomb Floor
« Reply #8 on: September 05, 2018, 05:00:59 PM »
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Offline V153

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Re: Honeycomb Floor
« Reply #9 on: September 06, 2018, 04:27:56 PM »
Quote from: RedOctober89 on September 05, 2018, 03:30:08 PM
Okay! Wow a 2' span using 3/8" is pretty impressive!

Are those PVC boards on the underside once installed, so you screw/fasten through the honeycomb into the PVC? Or other way around?

Thanks!
Underneath. Used SS tee nuts to fasten the seat, tank, etc down.
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'81 C500_given away, bought back_75.1 mph
'81 Baja 15SS_140 Frankenrude_66.7 mph
'70 something SpeedCraft_(Allison 16R Clone)_69.0 mph
'79 CVZ19_given away
'71 V153_54.8 mph_wrecked


WALK TALL AND CARRY A BIG BILGE PUMP

Offline RedOctober89

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Re: Honeycomb Floor
« Reply #10 on: January 29, 2019, 12:53:34 PM »
Planning on picking up some honeycomb this week for the boat. I talked to the fellow at Composites Canada and he suggested to use 2 layers of 1708 on both sides of 3/4" Nida Core honeycomb, and that I would need about 5 gal of resin to do the job. (approx 3x 4x7 sheets for the 23CSS floor) To me 2 layers of 1708 on either side sounds pretty heavy duty.
I see Diamond Chad with his CVX 16 used 1.5oz csm. Looks similar to what Shawn did on his CV23 sun pad??

I won't have any areas larger than a 20x20 square that do not have any support. Do you guys think a single layer of 1708 would be adequate on both sides?
I haven't come across any manufacturer suggestions or specs on laminating it either..
any insight would be greatly appreciated!!
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Andrew C.
1989 Glastron Carlson 23 CSS 350 Mag - Red October
Follow the project on Instagram: redoctober89

Offline fireman24mn

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Re: Honeycomb Floor
« Reply #11 on: January 29, 2019, 01:21:46 PM »
With just one layer of csm it gets pretty ridged. Biggest area with out support is over the gas tank. I added in some supports over mine.

How do you plan to screw seats down?
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1977 CV-23 I/O Full Resto complete
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Offline RedOctober89

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Re: Honeycomb Floor
« Reply #12 on: January 29, 2019, 01:28:29 PM »
Yes I have added supports as well over the tank. I made a support for the seats that are fastened to the stringers that's flush with them. So the honeycomb flooring will sit between the seat base and the support.
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Andrew C.
1989 Glastron Carlson 23 CSS 350 Mag - Red October
Follow the project on Instagram: redoctober89
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