as someone who has actually worked with boat type epoxy - what's your opinion of UV cure type polyester resins vs hardened epoxy?
as someone who has actually worked with boat type epoxy - what's your opinion of UV cure type polyester resins vs hardened epoxy?
In reply to Kenny_McCormic:
Here are a couple of over all shots. The seat top and steering mount are temporary. They will be changed to a more permanent arrangement, that runs all the way to the transom later. I want to get this thing in the water and test run before it gets too cold. I'm also not sure where the drivers seat will end up. For now, it will be to the right of the engine but, if it has a tendency ride bow high, I may move the driver forward to the next seat. In these shots the tiller has been removed for welding. My father has his welder set up for stainless, so I will be welding it at his house this weekend.
I still have to build a engine cover, mount the electrical box that contains the coils and starter solenoid, and get at least a couple of coats of paint under the engine.
More to come.
ultraclyde wrote: as someone who has actually worked with boat type epoxy - what's your opinion of UV cure type polyester resins vs hardened epoxy?
On my last boat project, I used polyester, because it was $16 a gallon and epoxy was well out of my price range. It's great stuff, easy to work with, cured every time, but there is one problem. Polyester is hydroscopic, it sucks up water like a sponge. It's not a problem with a 100% wood free hull but, if you use wood as a core, you have to be meticulous about waterproofing. I wasn't and after 15 years, every piece of wood I used in the repair has turned to mush.
Epoxy is 100% waterproof. You can coat a piece of wood, bury it in your yard, or submerge it in a pond and in 10 years, it'll still be a piece of wood. I use wood as a core and filler because it's what I can afford, so this time I'm using epoxy.
Edit: This answer may not apply to UV cure polyester. I'm not familiar with that product, but being a polyester, I'd bet it's still hydroscopic.
I love this project and check for it's updates daily... so don't take this the wrong way when I say the word is HyGROscopic? :)
Carry on, can't wait to see it splash!
Beagle wrote: I love this project and check for it's updates daily... so don't take this the wrong way when I say the word is HyGROscopic? :) Carry on, can't wait to see it splash!
Damn, you are correct. I always did suck at spelling. I came very close to Googling it, but was too lazy. 
Toyman01 wrote:ultraclyde wrote: as someone who has actually worked with boat type epoxy - what's your opinion of UV cure type polyester resins vs hardened epoxy?On my last boat project, I used polyester, because it was $16 a gallon and epoxy was well out of my price range. It's great stuff, easy to work with, cured every time, but there is one problem. Polyester is hydroscopic, it sucks up water like a sponge. It's not a problem with a 100% wood free hull but, if you use wood as a core, you have to be meticulous about waterproofing. I wasn't and after 15 years, every piece of wood I used in the repair has turned to mush. Epoxy is 100% waterproof. You can coat a piece of wood, bury it in your yard, or submerge it in a pond and in 10 years, it'll still be a piece of wood. I use wood as a core and filler because it's what I can afford, so this time I'm using epoxy. Edit: This answer may not apply to UV cure polyester. I'm not familiar with that product, but being a polyester, I'd bet it's still hydroscopic.
AAAAaaannnnd that's just the sort of insight I was looking for. Cure method won't change the basic nature of the polymer (well, not THAT much). The brand I've looked at (Solarez) uses surfboard building for all their demo videos. Most of what they're laying it on is foam so it's not an issue I imagine. They did some wood fins wit it but that's a lot different than boat parts. I've been noodling about different ways to add an in-deck battery box to my sail boat and had thought about doing resin over wood but I think finding a pre-made will be cheaper and longer lasting given the price of epoxy.
I sure do want to learn how to do glass/epoxy though....
Toyman01 wrote:fidelity101 wrote: nice rx7!It's seen better days and is available to someone looking for a challenge priced project. https://grassrootsmotorsports.com/forum/200x-classifieds/1983-mazda-rx-7-gsl/76647/page1/
I saw this and immediately thought about making an inboard 12a or better yet 13b powered rowboat. Since I would only use it in fresh water I would use lake water for cooling. .. . . That would net you about 100HP I think. Put the exhaust dump under watter to keep it relitily quiet with a diverter that puts it strait out the back when you want to wake people up. . .. . .Hummmmmm I am having evil thaughts. Would you need a transmission? I know revers would be an issue but boy would it be fun.
Oh I was reading about your car and noticed it was an automatic. I wonder if that would actually be a better thing to power a boat with. Keep the transmission in tact with the motor and you have revers and what not.. . . . . Hummmmmm Ok weird but would it work?
Don't know if this has been posted already but this has me looking at your project and going that is not going to be slow!!!!
https://www.youtube.com/watch?v=-Z1ZSWDouUU
Make them foot controls and go around holding oars.
I found this thread that should give you some confidence that your boat will perform well. Or at least I think so: http://www.tinboats.net/forum/viewtopic.php?p=318037
That was a 500cc donor on a 14' aluminum flatbottom. I know it's different...but still.
Spoiler alert: His cavitation problems seemed to be due to a broken impeller.
I'm calling the outside of the transom done. The paint isn't perfect, but it's good enough for this project.
Steering, throttle and ignition kill switch are good enough for a test run.
The only thing stopping a test run, is plumbing the fuel tank, wiring the CDI box and battery, and cleaning up the mess. That's happening tomorrow.
If you really want to mess with all of us, you say "All done! I'm heading for the lake!"...
...and then don't post on the forum for a week.
Keith Tanner wrote: If you really want to mess with all of us, you say "All done! I'm heading for the lake!"... ...and then don't post on the forum for a week.
You're evil......
Don't forget to take video!
DaveEstey wrote: Make them foot controls and go around holding oars.
Not the video you wanted but this is as close as it gets this weekend.
https://www.youtube.com/watch?v=Pp4nn0ZSQEs&feature=youtu.be
Engine is bolted down, wiring done, fuel lines run, done, done, done.
It won't run unless you dump fuel down the carburetor. 
This weeks project will be replacing all the fuel lines, and putting a rebuild kit in the carburetor.
Edited to fix the link.
This forum is bad for my health, today I caught myself in the boatyard staring at some abandoned racing dinghy with a tree growing in it, eyeballing the distance between the centerboard slot and transom to figure if the powerplant from the abandoned waverunner III nearby would fit. Dual sport boat.
In reply to Toyman01:
You've made a lot of progress!
SyntheticBlinkerFluid wrote: In reply to Toyman01: You've made a lot of progress!
Next weekend, it's going in the water. It won't be completely done, but it will be test run to make sure it works. Then I can spend the coldest part of the winter making it look good.
Maybe not next weekend after all.
27 MPH with 4 people in it.
Faster than I thought.
Toyman01 wrote: 27 MPH with 4 people in it. Faster than I thought.
AWESOME!
How's the slow-speed handling?
In reply to psteav:
It will almost turn within it's length.
Toyman01 wrote: 27 MPH with 4 people in it. Faster than I thought.
That's pretty quick with that kinda boat. Awesome.
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