DAYTRIPs Bertram 28 Strech

Questions about boat repairs with our resins and fiberglass: hull patches, transoms and stringers, foam, rot etc.
DAYTRIP
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Re: DAYTRIPs Bertram 28 Strech

Post by DAYTRIP » Wed Feb 06, 2019 9:13 am

Thanks Rick! I have not knocked the bottom mold out yet. Want to get all structure in there first. I did take the molding surfaces off the bracket. Looks good.


Image



cvincent
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Re: DAYTRIPs Bertram 28 Strech

Post by cvincent » Wed Feb 06, 2019 9:39 am

Hi Daytrip,

Would you be willing to share details regarding the layup of your bracket? Are the sides and bottom cored with plywood or is this a solid fiberglass layup such as 1708? I am considering building a larger boat in the future such as the AB23 and I may attempt to build a bracket. Thanks
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DAYTRIP
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Re: DAYTRIPs Bertram 28 Strech

Post by DAYTRIP » Wed Feb 06, 2019 1:58 pm

Of course, the outside skin is 6 plys of 1708 (3/16” approx). The inside of the clamping board is 6 skins. On mine the clamping board core is 3” thick but that is for 600 hp. No core anywhere else. The big thing is the stringers extend in to carry the load. This is the same layup I did on the boat I am running.

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Re: DAYTRIPs Bertram 28 Strech

Post by cvincent » Wed Feb 06, 2019 3:32 pm

Much appreciated! That is going to be a fine boat when you are finished.
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Fuzz
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Re: DAYTRIPs Bertram 28 Strech

Post by Fuzz » Wed Feb 06, 2019 4:24 pm

Man that is some tall stringers. That thing is going to be strong. :D

DAYTRIP
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Re: DAYTRIPs Bertram 28 Strech

Post by DAYTRIP » Wed Feb 06, 2019 6:31 pm

Yea way over kill. Really only that tall to carry the sole

DAYTRIP
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Re: DAYTRIPs Bertram 28 Strech

Post by DAYTRIP » Mon Aug 19, 2019 3:32 pm

Been a long time since the last update on this one. The stringers are in and the molds have been taken out of the extension. Have fabricated the fuel tanks and are preparing to set them in permanently. Three tanks totaling 340 gallons. I have done a lot of modeling and weight and balance calcs on this one so I am more certain on weight placement and trim. In summary the COB is 9'3 forward of the transom and my fuel load is centered over that. This one has a design load of 9200lbs to float as designed. We will see how good my calcs are someday in the future!

Third tank goes in the center. it is 120 gals and the wings are 110 gals each

bow looking aft
Image

stern looking forward
Image

So after much thinking :doh: I am of the opinion that the more air circulation around the tank the better. That said no foam. I have made a bed for the tank to sit on the hull using a woodflour putty with 2x6x1/4 starboards pads. I put the putty down, put the pads on then set the tank down on top and let it cure. I will make bumbers on all 4 sides to restrain the tank laterally then either tab the tank to the stringers at the top in several areas or make some type of restrains at the top as it will go upside down before it is done. No coal tar as I have seen both sides of that argument. No idea if this is the all absolutely the best but it is the path forward!
Image
Last edited by DAYTRIP on Sat Sep 07, 2019 7:25 pm, edited 1 time in total.

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cape man
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Re: DAYTRIPs Bertram 28 Strech

Post by cape man » Mon Aug 19, 2019 4:18 pm

Nice tanks!
The world always seems brighter when you've just made something that wasn't there before - Neil Gaiman

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Re: DAYTRIPs Bertram 28 Strech

Post by Rickk » Sun Aug 25, 2019 6:26 pm

Wow, I wouldn't want that fuel bill. My Aquasport 230 takes 140gals and my RV takes 150gals so I am used to those shocks but 340 gals 8O
What are the black supports on the bottom of the fuel cell areas made of?

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Re: DAYTRIPs Bertram 28 Strech

Post by DAYTRIP » Mon Aug 26, 2019 9:53 pm

Yea I try not to think about actually filling them up! Those pads are starboard Rick. I am going to use pvc on the center tank. How’s your boat running? I thought you did a 17?

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