30" Scratch Built Cat

[kodiak]

Hey guys is it too late for a new guy to get a set of plans for this cat? if not please send me some at [email protected] thanks Bill

[sft2]

I could use a set, too. Preferably in a format that will let me easily enlarge it to somewhere around 55". Everyone needs a boat they can't fit in their vehicle

[Viceguy]

Twin motor configuration questions

Hi all, i've just started to build this boat (blown up to 35 inches) and are already facing problems with twin motor setup. I've found it cluse to impossible to mount the motor without doing it before i put in the sponson, which again bring up the question: how to replace a motor if one get faulty?

Any suggestions for me guys? Going single motor is not a option as i have RTR boats with that setup, my only option as i see it is to just stop the production and buy me a twin motor cat and just acccept that the money i've spent so far are lost

[kfxguy]

Twin motor configuration questions

Hi all, i've just started to build this boat (blown up to 35 inches) and are already facing problems with twin motor setup. I've found it cluse to impossible to mount the motor without doing it before i put in the sponson, which again bring up the question: how to replace a motor if one get faulty?

Any suggestions for me guys? Going single motor is not a option as i have RTR boats with that setup, my only option as i see it is to just stop the production and buy me a twin motor cat and just acccept that the money i've spent so far are lost

Sell that hull if you want to start over. I'm sure someone would be glad to take it off your hands. I have a 32" cat and a 37" cat I can make you deal on either. I have fiberglass or carbon. I bought a few extra for builds I'm doing....but I don't really need them. I just collect stuff I guess.

[Viceguy]

The parts for this boat will be used to light up our fireplace this winter, kudos to tread starter for managing to build this boat. I could not do it, got stuck when trying to make and put on the outer skin. If this tread had covered that (and even better if the drawings had included that parts) then maybe i would have finished mine also.

2000 nkr wasted

[Viceguy]

Ok... gave this a 2nd try and just chosen to have a single motor instead. Now when i've covered more or less the outside of the hull with 0.8 mm waterproof plywood more questions are coming to my mind, and as a newbee builder i'm stuck without answers.

how do i proceed with the hull, do i put filler (or whatever it's called) on before or after epoxy? Also how many layers of epoxy do i put on, i assume i have to sand it smooth before starting to paint with colors.

[Jesse J]

Glad to hear you got some skin on. I had mine set up as twin but since she is a little narrow, I went back to single.
I suggest sealing with west systems marine epoxy, then filling with 1 lb us composite 2 part foam. Then sand down the top to the form you want and glue on the decking.
If you want to chat on the phone about it, pm me your number and I can call you.

[Viceguy]

Thanks Jesse, it's actually the decking i'm talking about :) Sorry for my sometimes poor english to explain things. I've done the styrofoam part, made blocks and put them inside. So now i have more or less below the waterline skinned (as you said), so i guess my question are actually about the skin and decking.

I have the West Systems Epoxy, so that's been taken care of :)

I'm in Norway so i doubt you will do such a expensive phone-call :D

[Viceguy]

Will this one work on my boat? Looks like it has all i need except from the propeller

http://www.ebay.com/itm/110mm-rudder...item1e73b3a42c

[Viceguy]

Tried my boat in the bathtub today to see where it take in water (it's bound to do that the first time, right). I have painted it with 3 layers of west systems epoxy, not yet put on the decking so i still can get inside the hull. Red areas on this picture is where the water come inside so i have put casco superfix inside in every "intersection" where plywood edges are. Hopefully that will work, will do a new test tomorrow

leaks.jpg

[flraptor07]

Tried my boat in the bathtub today to see where it take in water (it's bound to do that the first time, right). I have painted it with 3 layers of west systems epoxy, not yet put on the decking so i still can get inside the hull. Red areas on this picture is where the water come inside so i have put casco superfix inside in every "intersection" where plywood edges are. Hopefully that will work, will do a new test tomorrow

[ATTACH=CONFIG]123283[/ATTACH]

I'd seal the seams from the outside too.

[Viceguy]

Will fill the outside with more epoxy in that areas, just need the superfix to cure first. I think that's the only option i have, if that fails then i will (maybe) use the boat to make a fiberglass plug for a future mold

[Viceguy]

Old thread but i figured i could update you all, and ask for advice. The boat are finished and the maiden voyage somewhat worked great except that the rudder servo burned. Which lead me to my question, what kind of servo do you guys suggest i use for the rudder. The one i had was rated at 6.4 kg and apparently it was not strong enough for the task.

Picture IMG_0666.jpg And a of the boat, maiden voyage

[Jesse J]

Hey Frankie, glad to see you stuck with it!
Looking good, but I would try to loosen her up a little; kinda wet running.
What angle do you have the strut?
Where is your center of gravity?
How much above your sponsons is the center of prop shaft?
Are you giving your servo more voltage than it is rated for?

[Viceguy]

Thanks Jesse :) Sadly English isn't my native language so i have no idea what you mean by "loosen her up a little".... also are you talking about the rudder when ask about the strut? Center of gravity i assume you mean the pivot point of the boat, that's at 57 cm from the front (total length of the boat including the rudder are 101 cm)

"How much above your sponsons is the center of prop shaft?" I assume you talk about below the hull when i have it lying upside down, which would be 2,5 cm

Servo are 6v (aka not the new 7,4V) and that's what the ESC are giving, i'm thinking more along the ideas that i need a stronger servo... a dealer here talked about one that are rated 25 - 35 kg (which really sound like overkill to me, but i'm a newbee).