1st build, got some questions.

[castellina]

Hi all, I am new to this forum. Ive been doing some research, and I found some plans for a boat online that I'm going to build. My school has a laser cutter, so I will be cutting the pieces for my boat with that. Here is the link to the plans I found online that I'm using. Let me know what you think. http://www.rcgroups.com/forums/showthread.php?t=854832

As far as hardware, motor, etc... I have a few questions.

1. will this rudder and strut assembly be good for me? http://www.offshoreelectrics.com/pro...prod=ose-80085
2. My motor is a venom fireball brushed 15d. Will it have enough power? Will it hold up? Im going to water cool it to prolong its life.


Along the lines of the hull building process, I'm thinking of getting it put together with wood, then fiberglassing over the wood. The wood will serve as a mold, and when its dry I will pull the wood out, and have a pure fiberglass hull... Any objections? Should I make a strictly wood hull? Fiberglass and wood? I would love all the opinions I can get, like I said I have never done this before.

If you guys can think of anything that I should know about before starting the process, or any tips/tricks of any kind please let me know.

Thank you,
Kyle

[Make-a-Wake]

Welcome to OSE!!

Neat little project here. I think a 15t motor is too high, that would be around 30,000 rpms(or so) on 8v. Maybe consider something in the 23-27t range. Also, you cant run a heavy 6 cell nimh in that boat with limited power of brushed. You need to run a 2s Lipo in the 1500-2000mah range for weight purposes.

[castellina]

Thanks for responding so quickly, so what you are saying is my motor has to much power? What would the consequences be of using it? would the boat just be hard to control? Also if I do keep this motor, will a 2s lipo work on it? Or is it only if I buy a different motor?
Thanks, kyle

[Make-a-Wake]

Not too much power, you cant gear a boat as you can a land vehicle which it is intended for. Boats need to stay in a comfortable rpm zone to keep the heat down. Boats and land rigs are quite different, much higher constant amp draw in a boat and no air circulation. You could try your motor, but will need a very small prop which then may lead to cavitation.

[castellina]

1st build, got some questions.

Oh I see, it will run at too high of an rpm, causing heat. We will see, if it burns up I'll buy a better motor. I'll keep this thread updated as my build progresses.

Just thought of something, what if I rigged up a fan that would suck air from outside? Would that help at all?
Thanks

[Make-a-Wake]

If you flip it you will suck water from the outside as well..............then possibly sink

[castellina]

true, very good point thanks.

[castellina]

Hey, Im going to cut my pieces for the boat this week hopefully. When I get them ill make sure to post some pictures. Im not quite sure what to do about actually building the hull. Should I make is strictly out of wood? Fiberglass and wood? or use the wood as a mold for the fiberglass, then pull the wood out?
Thanks for the help, kyle

[castellina]

I dont know if you guys are interested but here is what I have so far.

[Make-a-Wake]

We're always interested! Nice work

[castellina]

Thanks, I'll keep posting pics. In the mean time, here's my updated shopping cart list.
How's it look?
Thanks

[Make-a-Wake]

My word...........................a 2860 in an 18" boat? Wow. Stiffen that baby up so the motor doesn't just twist it up. That's overkill on motor................but you wont ever have to upgrade.

[castellina]

I made it 24 inches, and once I finish up the wood part I'm going to fiberglass over the wood. I think that should help quite a bit, and add a little weight to it.
Thanks

[Make-a-Wake]

Oh, I didn't realize that it was 24". That will be a good powerplant, still gonna haul butt.

[NativePaul]

Oops, I didn't just double post honestly officer.

Good luck with it, it is great to see people designing for themselves and actually building their boats. Especially new people.