Build thread: Cozy F1 T800 33" tunnel

[Dirk Jan Cozy]

Yesterday I ran 2 lipo's through the Cozy F1 T800. After 12 runs, the hull and outboard hold up well.
Top speed is 57mph so far, with 643 prop. I'm still fine-tuning the setup. I think with the prop set a little higher, it could go faster. I'm shooting for 62mph (100 km/h).

The hull is really stable, even when pushed a little harder. Here's a video of yesterday's run:

 

[Manuel Xavier]

Yesterday I ran 2 lipo's through the Cozy F1 T800. After 12 runs, the hull and outboard hold up well.
Top speed is 57mph so far, with 643 prop. I'm still fine-tuning the setup. I think with the prop set a little higher, it could go faster. I'm shooting for 62mph (100 km/h).

The hull is really stable, even when pushed a little harder. Here's a video of yesterday's run:

The hull is fast, but perhaps more important it's cornering very well. It can be a very competitive hull, for electric or nitro outboard racing.

 

[Dirk Jan Cozy]

Last weekend I took the T800 to the pond again. Running a 44mm 1.6 pitch prop I got to 60mph.
It was quite windy and the hull was running a bit too loose in these conditions. Carefully against the wind..

Here's a video of last weekend. I flipped the hull twice. The hull holds up quite well, but I destroyed 2 steering servos already

Esc is a Turnigy Marine 120A. Holding up surprisingly well. At least for the fun boating I do

 

[Wasted wages]

Nice flip!!!

 

[Grahame Morgan]

Dirk, Nice looking boat. I am getting bits together to start a similar project but having trouble finding a supplier for the outboard leg.
The one you are using is real nice could you let me know where you bought. Sources here in the UK are very limited.
Thanks
Grahame

 

[Dirk Jan Cozy]

Thanks Grahame. I got it from TFL Germany. This is the link: Aussenborder groß, ohne Motor V2

Did you buy a hull, or will you build one yourself?

 

[Grahame Morgan]

Thanks for the link. Going for the ZipKits G30 to start with, then hopefully get some knowledge of how they work & go from there. Do a lot of I.C racing, Endurance & offshore plus play a lot with electric ECO & hydro. Just looking for something different as it keeps me occupied. Built one many years ago with K&B 3.5 but never really got it running properly, Hopefully with electric I will have more luck.

 

[Dirk Jan Cozy]

I think the G30 is a great kit. It performs well and there's enough knowledge in this forum to make it run properly.
Enjoy the build

 

[Grahame Morgan]

Thanks, Have just ordered the outboard strut. Thanks for link.

 

[Dirk Jan Cozy]

Here's a review video of my T800 Tunnel:



2 T800's are in the making by another member. They will be setup with a 7.5cc outboard.

 

[Dimitrios Louzis]

2 T800's are in the making by another member. They will be setup with a 7.5cc outboard.

That is a very interesting project!!

 

[Dirk Jan Cozy]

Yesterday I ran my T800 Tunnel at the RC Powerboats event in Netherlands. Many great boats, gas, electric and even turbine powered.

Here's a video of one of my runs:



Unfortunately, a huge MHZ cat collided with my T800 at the end of the day. The cowl and radio box are badly damaged, but it is fixable. That means back to the workshop!

 

[XtremeRcBoats]

Too bad about the damage Dirk Jan, hope you can fix it. I was not able to go Hank, maybe next time.

 

[Dirk Jan Cozy]

Thanks Xtreme, yes it is fixable. I will make a new cowl, I already received the carbon weave for that.
It was a great event. Well organized and many cool boats

 

[XtremeRcBoats]

Good to read you liked it and that you can fix it. Was there last year but could not make it this year.

 

[Dirk Jan Cozy]

The repair is going well and I made a video of it:

 

[Dirk Jan Cozy]

The T800 runs again! Yesterday I ran 2 packs through it. At first, it ran too wet, but with 1mm up-trim of the outboard, the T800 ran good. I had some bad luck with a broken flex shaft as well, but I replaced it at the pond.

Here's a video of yesterday:

 

[Manuel Xavier]

The boat turns very well. Probably in the near future I will build a nitro version

 

[Dirk Jan Cozy]

Thank you Manuel. Yes, the boat steers very sharp. In the video, the boat could run a bit more loose by adjusting the leg angle 1mm up. But it was a bit windy, so better be on the safe side and keep the boat right side up

 

[Dirk Jan Cozy]

Topic update; I worked on a laser cut kit of this boat and I started to build one myself.
This kit contains several design upgrades, such as a bigger sponson deadrise for more speed and a lot of cuts and notches for a fool-proof and strong assembly.



It is a frame kit, meaning the deck and sponson plating have to be arranged yourself. I will release a complete kit with plating beginning of 2024.

The parts fit together great. It took me about 4 hours to build the tunnel mid section. Here's part 1 of the build: