DIY twin motor mono build 'G-Force'

[Dirk Jan Cozy]

Hi fellow boaters,

Last year I built a 32" Wildthing that I slightly modified. It started as a 60+ mph boat build, but it proved to be quite a bit faster with 75mph top speed.

I enjoyed the build and performance so much, that I decided to build a twin mono. It is again based on the Wildthing, but I modified the design a lot. This boat is 33.5" and will get dual stinger drives and a 6S setup. Most likely 2x 3674 2000kV motors and 150A Flycolor esc's.

Here's the design, although it still had a single motor setup here:

I cut the frames and set them up at the building board.

I also upload the build on YouTube, if you are interested:



Next step is apply the bottom and side sheeting and release the hull from the build board.

 

[XtremeRcBoats]

Nice project again dirk Jan. You are a fast builder. Did you cut the frames out by hand?

 

[Dirk Jan Cozy]

Thanks Xtreme. Yes, I build the old fashioned way; cut by hand jig saw.

 

[Roxyflash]

Very nice work!Should be very lite and strong.

 

[Peter Wibe Enevoldsen]

another beautiful boat in the works! i have been watching all your youtube videos while i work on my boats

 

[Dirk Jan Cozy]

Thanks you for your comments guys. It keeps me motivated to make a nice build.

Here's part 2 of the build:


I progressed a bit more after that. Here are some photos of the 200gr/m2 carbon weave I laminated into the hull.



I put fillets of thickened epoxy (with micro balloons) in every corner.



By using paper templates, I cut the patterns of each weave to size.
All together quite a fiddly process. The hull feels very strong already.
I will also laminate the longitudinal bulkheads with carbon fiber.

 

[Dirk Jan Cozy]

I continued the carbon laminate on the longitudinal bulkheads and the deck plates.
The deck is just attached by tape for now.

I got 2 Rocket 3670 1850kV motors and 2 Flycolor 150A esc's.




I'm also working on DIY stinger drives. The stinger tube will finally be made from carbon tube.

 

[Luis Oliveira]

Wow! Not taking any chances on hull strength, right? Looking good. What is the deck made of? Carbon fibre sheet, or carbon fibre laminated ply?

 

[Dirk Jan Cozy]

Exactly, this one needs to be strong, as the weight of the twin setup will be higher as well.
The deck is made from ply, laminated with carbon. I will show it in video part 3

 

[Dirk Jan Cozy]

Here's build video part 3:

 

[Peter Wibe Enevoldsen]

Im loving this build, i think all the work with the fillets and carbon will make it very strong! Keep it up

 

[Dirk Jan Cozy]

I filled the bow with pool noodle and I cut the deck opening. The deck is not attached yet.



I'm now working on the twin motor mount:






I modified the Flycolor 150A/ OSE 150A esc For a more efficient cooling and smaller dimensions, to fit this hull.

 

[FloridaScaleBoater]

You are a true craftsman Dirk
Quit the hobbyist.

 

[Dirk Jan Cozy]

Thanks FloridaScaleBoater.

I put some effort in making my own stinger drive from scratch. Why? Because I love DIY building



Here's the video of how I made it:

 

[David Ashcroft]

Euro do it best..

 

[Dirk Jan Cozy]

Thanks David

Here's part 5 of the build:


The sides are glued and laminated to the hull, flotation is added, the motor bracket is made and the deck is fitted with the hatch support.

 

[Peter Wibe Enevoldsen]

i just watched it, great work!

 

[Dirk Jan Cozy]

Thanks Peter.

Here's part 6. I glued and glassed the deck and installed the first driveline.

 

[Dirk Jan Cozy]

Next episode, no 7: I worked on the hull bottom, adding spray rails. Also I glued the lipo tray in the hull:

 

[Dirk Jan Cozy]

Last week I made a rudder bracket from forged carbon fiber.

I made a mold from wood and taped it to prevent the carbon and epoxy mix to stick to it.
The mold has a top part, which presses the carbon and epoxy together.

The part game out nicely. After making some cutouts and a lot of sanding, this is how the part turned out:


I will edit and upload the video of the process this week.