My cx 25
- OrangeQuest
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Re: My cx 25
Great to see updates on your big build! Great work!
"that it isn't just an ordinary sort of boat. Sometimes it's a Boat, and sometimes it's more of an Accident. It all depends." "Depends on what?" "On whether I'm on the top of it or underneath it."
A. A. Milne
A. A. Milne
Re: My cx 25
Great Picture Danilo! The build is looking really nice.
I would raise the floor for the tanks. It should not be an issue.
I would raise the floor for the tanks. It should not be an issue.
Re: My cx 25
If those tanks are polyethylene they will expand 2-3% of their size over the first month they have fuel in them. Make sure you have room for that between the stringer or it could damage the tanks or the stringers.
Re: My cx 25
thanks for the advices.thb wrote: ↑Thu Sep 13, 2018 8:50 am Danilo,
I think I would keep the tanks totally separate so you can fill each one individually and adjust your cg depending on your fuel load. You can have a fuel feed 3 way valve which you can switch which tank is feeding the engine.
Other option is to turn tanks around so that fill and vent fittings are near each other and get a 1-1/2 inch brass Y or T fitting to connect them.
If tank fittings are higher than stringers you have other issue you need to solve to raise the sole in this area.
Regards
Tom
I think tanks connect them in a single shipment, so I install less pipes.
as regards the boarding connection, I resolve by raising the floor by three cm.
Re: My cx 25
I'm sorry but if I put foam all around, I would have the same problem?
Re: My cx 25
You can't foam around polyethylene tanks for that reason.
I'm sorry but if I put foam all around, I would have the same problem?
Example instructions: https://www.jamestowndistributors.com/u ... docId=1025
IMPORTANT: Do not use foam to secure tank in place. Resin fuel tanks require a multidimensional expansion area of 2.3% at all times; foaming a tank in place removes the chance for hydrocarbon expansion and will void tank warranty.
- Jaysen
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Re: My cx 25
Does that mean that actual tank capacity is variable? EX if you have a half full tank, the tank may expand inward making the "empty" portion less than the actual volume of 1/2 the tank capacity.joe2700 wrote: ↑Thu Sep 13, 2018 1:18 pmYou can't foam around polyethylene tanks for that reason.
I'm sorry but if I put foam all around, I would have the same problem?
Example instructions: https://www.jamestowndistributors.com/u ... docId=1025IMPORTANT: Do not use foam to secure tank in place. Resin fuel tanks require a multidimensional expansion area of 2.3% at all times; foaming a tank in place removes the chance for hydrocarbon expansion and will void tank warranty.
Or would that only happen if the tank was restricted from expansion?
Thanks.
Re: My cx 25
I'm under the impression it's kind of a one time thing, and that once it's grown over that first month it will basically stay expanded, unless maybe you let it completely air out for a long time. I think if you restrict it from expanding outwards like its supposed to it may deform. All this is conjecture on my part though. Just what I've gathered from the manufacturers instructions and Boatowners Mechanical and Electrical Manual which I kind of consider the bible of marine systems.Jaysen wrote: ↑Thu Sep 13, 2018 1:27 pm
Does that mean that actual tank capacity is variable? EX if you have a half full tank, the tank may expand inward making the "empty" portion less than the actual volume of 1/2 the tank capacity.
Or would that only happen if the tank was restricted from expansion?
Thanks.
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