Cozy F1 Tunnel - wood build

[Dirk Jan]

Hi fellow rc boat enthusiasts, this is my first post here, so I introduce myself shortly: my name is Dirk Jan, I'm from the Netherlands and I am building rc boats for many years now. I especially like to build wooden boats.

I read along for a while now and I think this forum is great. You can find a lot of knowledge and nice boats here.

Time for me to share my latest project with you. I designed my own F1 Tunnel hull, called Cozy F1 Tunnel. It's 23.6 inches long and it will get the following setup:

- Hobbyking/TFL outboard
- 3S 3Ah lipo Turnigy
- 60A Marine esc
- total weight: 3,3 lbs

The cowl I will make myself from glass fabric and epoxy, using a mold.

I designed the hull in Pro/Engineer CAD software:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/130830_iso_tunnel_spanten_zpsc70a583b-1.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/130830_iso_tunnel_spanten_zpsc70a583b-1.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/130830_iso_tunnel_compleet_zpse106644d-1.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/130830_iso_tunnel_compleet_zpse106644d-1.jpg.html)

I make all frames myself by using a hand saw, no laser kit here ;)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04784_zps15f98b77.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04784_zps15f98b77.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04787_zpsca6bb75e.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04787_zpsca6bb75e.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04789_zps268890a4.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04789_zps268890a4.jpg.html)

[Dirk Jan]

Next couple of photos:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04793_zps03796676.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04793_zps03796676.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04800_zpsec6a73ec.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04800_zpsec6a73ec.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04801_zps0214a772.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04801_zps0214a772.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04870_zps1d64bfb6.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04870_zps1d64bfb6.jpg.html)

And starting with the tunnel itself:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04867_zps202e6b42.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04867_zps202e6b42.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04906_zpscd8a6947.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04906_zpscd8a6947.jpg.html)

[Dirk Jan]

Build post #3:

Test fit the sponsons to the tunnel. It starts to look like it! :)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04910_zps9a9f9ed2.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04910_zps9a9f9ed2.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04913_zps255f9b4c.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04913_zps255f9b4c.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04914_zpsea6fc6e4.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04914_zpsea6fc6e4.jpg.html)

Reinforcing the tunnel with some ribs and adding some high density foam for flotation:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04921_zps3d20e744.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04921_zps3d20e744.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04925_zps2182b651.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04925_zps2182b651.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04934_zpsfed4c5d4.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04934_zpsfed4c5d4.jpg.html)

So far for now. More updates will follow soon!

[Dirk Jan]

Build post #4:

Finishing the tunnel and laminating the hull with 50 grams glass fabric.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04941_zpsad5c693a.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04941_zpsad5c693a.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04948_zpsfe43aa34.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04948_zpsfe43aa34.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04951_zps8e4cafdb.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04951_zps8e4cafdb.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04982_zpsf125412e.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04982_zpsf125412e.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04983_zps0bf4cec9.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04983_zps0bf4cec9.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04985_zpsfaf30bf2.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04985_zpsfaf30bf2.jpg.html)

[Dirk Jan]

Build post #5

Some more photos from the hull with the sponsons attached and starting to work on the cowl mold.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04993_zpsc270bf49.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04993_zpsc270bf49.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04994_zpsde4b24a9.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04994_zpsde4b24a9.jpg.html)

Servo / receiver plate:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC04995_zpsb7809c1f.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC04995_zpsb7809c1f.jpg.html)

Modifying the back of the tunnel a bit for more room for the steering links:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05016_zps23039136.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05016_zps23039136.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05018_zpse20471c1.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05018_zpse20471c1.jpg.html)

And the hull so far. The servo plate is not glued yet. It will move more backwwards finally.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05017_zps765986f8.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05017_zps765986f8.jpg.html)

[grsboats]

Very nice building...looking forward to see some action videos.Thanks Gill

[Dirk Jan]

Thanks Gill! Here's the next build post:

Making the cowl mold:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05026_zps9ceafcf4.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05026_zps9ceafcf4.jpg.html)

Power plugs from esc to the motor:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05028_zps71708970.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05028_zps71708970.jpg.html)

The hull with electronics installed:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05064_zps3fb0c6a4.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05064_zps3fb0c6a4.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05117_zps612be894.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05117_zps612be894.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05134_zps1a17719b.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05134_zps1a17719b.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05699_zpse5d8f032.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05699_zpse5d8f032.jpg.html)

[ron1950]

wow ...always impressed with scratch built boats etc...great job

[Dirk Jan]

The mold is finished:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05769_zpsd01afb42.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05769_zpsd01afb42.jpg.html)

Applying 4 layers of 110 grams/m^2 glass fabric over the mold to make the cowl:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05775_zpsddd0200f.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05775_zpsddd0200f.jpg.html)

The cowl came out good:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC05777_zps6991c9a1.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC05777_zps6991c9a1.jpg.html)

Applied some base coat:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC06010_zpsa9c2196a.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC06010_zpsa9c2196a.jpg.html)

And finished except for the paint!

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20150214_132523_zpsuvqrbsfy.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20150214_132523_zpsuvqrbsfy.jpg.html)

It runs very well. The hull runs nicely above the water and turns very sharp. Top speed is 31.5mph. I'm still experimenting a bit with the setup to improve the performance. But so far I'm happy!

Here's a video:

https://www.youtube.com/watch?v=QpXAi-noyt8

If anybody is interested in the plans (PDF) send me a message. I share the plans for free.

[NativePaul]

Beautiful! :rockon2:

[studioRS]

Beautifully built! Thank you for documenting your F1 build. I am very interested in building one myself, PM sent. Thank you!
Cheers, Thompson

[Dirk Jan]

Thanks! :) You got the plans in your mail box.

[studioRS]

Thank you, Danke :thumbup1:

[seehuusen]

great work mate! very cool boat to run too by the looks of your video :)

[Dirk Jan]

Thanks Seehusen :) It is a very nice hull to run. I like the outboard setup and the hull almost entirely out of the water at full speed.

[Dirk Jan]

The temperature is finally rising here, and I'm now painting the hull. Here's a sneak preview :)

Next Saturday I will join a big rc boat meeting here in the Netherlands, so I have a deadline :)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20150411_105540_zpsprpil4ei.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20150411_105540_zpsprpil4ei.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20150411_105701_zpscrqmkua9.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20150411_105701_zpscrqmkua9.jpg.html)

[studioRS]

Very nice Dirk! I like the paint design so far. Good luck on the final result. Please post up lots of photos of the RC boat event in NL.
Cheers, Thompson

[Dirk Jan]

Thanks Thompson :)

I made some progress with the paint job. The paint is almost finished. The mid section of the hull (white part) has to be painted still. Also the cockpit window and some details.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20150414_191839_zpszxw03d4i.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20150414_191839_zpszxw03d4i.jpg.html)

I made a template for the cockpit window from some thick paper. Just put it on the cowl and mark the outline. Then masking it with some fine line tape.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20150414_193216_zps9o1vr83m.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20150414_193216_zps9o1vr83m.jpg.html)

[Dirk Jan]

I painted the mid section of the hull. In these pictures, the real color shows better.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC06473_zps1ywr0qnv.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC06473_zps1ywr0qnv.jpg.html)

The window is painted on:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC06476_zpsniobjagj.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC06476_zpsniobjagj.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC06477_zpszgr96ipb.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC06477_zpszgr96ipb.jpg.html)

Painted a black stripe between the two colors:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC06486_zpsnb4gabel.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC06486_zpsnb4gabel.jpg.html)

Next update the hull will have the decals on it.

[Dirk Jan]

The paint job and decals are finished! I made the decals myself with decal paper. I used this decal paper on my son's bike before with good results.

I just need to apply some clear coats of varnish and then I can hit the water again

Sorry again for the photo quality; my phone shows the colours not as bright as they actually are (see post before). Better pics will follow when I'm going to drive my Cozy F1 again.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20150429_152853_zpshpusw5lj.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20150429_152853_zpshpusw5lj.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20150429_152933_zpssah56sje.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20150429_152933_zpssah56sje.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20150429_152954_zpsoe5kqwqb.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20150429_152954_zpsoe5kqwqb.jpg.html)

[studioRS]

Awesome! Love the decals, this will look great on the water.

The boat stand is very nice too.
Cheers, Thompson

[Tamelesstgr]

Scratch built and absolutely beautiful!! I wish I had the time or patience for that.

[Dirk Jan]

Thanks!

@ Thompson: The boat stand took me some hours, but it came out good. It locks the hull in place so it cannot fall off during transport. I still have to add some ropes so I can carry the boat easily.

@ tamelesstgr, it took me about 2 years to build this boat, including some breaks because my busy schedule. Patience is the key to success I guess :)

[studioRS]

Thanks Thompson! The boat stand took me some hours, but it came out good. It locks the hull in place so it cannot fall off during transport. I still have to add some ropes so I can carry the boat easily.
Ahhaa! That is what the extra pieces of doubled up plywood are for, clever you. I even see your pencil mark indicating the holes to be drilled for the line. I'll make a suggestion, use sailing line, this will look so cool.
Cheers, Thompson

http://www.apsltd.com/images/CATEGORY/medium/7276.jpg

[Dirk Jan]

Good idea Thompson, I will have a look if I can find these lines somewhere close.

Last couple of days I ran my Cozy F1 a couple of times. The first time with it's colours :)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/150514_CozyF1_1_zpsojuzouvn.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/150514_CozyF1_1_zpsojuzouvn.jpg.html)

Yesterday it was pretty windy. The hull runs very loose in these conditions, which looks very cool This morning the water was almost flat and the hull then runs more 'tame'. I measured a top speed this morning of 33.5 mph

A short movie of this morning:

https://www.youtube.com/watch?v=iwprbwFo7n0

[Dirk Jan]

Plans are available online: http://www.rumrunnerracing.com/plans.html

Scroll to the bottom of the page and you will find them :)

[Dirk Jan]

Kick to this topic :)

Last summer I bought 2 different motors and another prop to try some different setups. First I switched the 3000kV outrunner with a 3200kV outrunner for a little higher rpm and it has more output: 500W against 400W for the 3000 kV motor.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC06580_zpsgupqwygj.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC06580_zpsgupqwygj.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/DSC06585_zpsszvmil6s.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/DSC06585_zpsszvmil6s.jpg.html)

The other motor is a 2800kV water cooled outrunner that I want to try with the 35mm prop shown.

The 3200kV motor does improve the performance of the Cozy F1, but it is not a huge difference. Top speed is around 34mph.

[Dirk Jan]

...But after only 2 runs with this motor I crashed the Cozy F1 and damaged both sponson tips. I removed the shattered tips and reconstructed them:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20150627_161830_zpslkyqigie.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20150627_161830_zpslkyqigie.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20151229_133604_zpskqion0tj.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20151229_133604_zpskqion0tj.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160131_132141_zpsbe7xz00z.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160131_132141_zpsbe7xz00z.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160225_105455_zpswvh4pfr6.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160225_105455_zpswvh4pfr6.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160225_154023_zps0d6hynz9.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160225_154023_zps0d6hynz9.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160515_140419553_zpsqg8tnmr1.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160515_140419553_zpsqg8tnmr1.jpg.html)

[Dirk Jan]

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160515_155839246_zpsnmbrcckl.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160515_155839246_zpsnmbrcckl.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160518_204500356_zpshposerkv.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160518_204500356_zpshposerkv.jpg.html)

Yesterday it was time to run the Cozy F1 again for the first time after the repair. It was very windy yesterday, not perfect for this little hull. I had to be gentle on the throttle, but still I flipped the hull twice. First time it rolled back on its sponsons, but the second time I had to rescue it.

The top speed was 54.4 km/h / 34mph. I will try the other motor/prop combo soon.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160521_134804076_zpsyyfgebcj.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160521_134804076_zpsyyfgebcj.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160521_140129498_zpsv4d863ey.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160521_140129498_zpsv4d863ey.jpg.html)

[grsboats]

Great building and you must be proud of your boat..awesome looking on water..congrats.Gill

[Dirk Jan]

Thanks Gill and yes, I'm quite happy/proud with the result ;)

[Dirk Jan]

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160530_203357538_zps4z1itrfb.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160530_203357538_zps4z1itrfb.jpg.html)

This evening I installed the 2800kV outrunner. This motor is twice as heavy as the little outrunner it replaces.

I will try this motor with a Aluminium 35mm prop, shown below together with the brass 33mm prop that comes stock with the HK outboard.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160530_212332589_zpstohliwka.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160530_212332589_zpstohliwka.jpg.html)

I don't like the looks of this outrunner sticking out above the cover. But I'm curious how this setup performs. This week I will test it.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160530_213011900_zpszhlsvcng.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160530_213011900_zpszhlsvcng.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160530_213001531_zpsmhy4qiqi.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160530_213001531_zpsmhy4qiqi.jpg.html)

[Dirk Jan]

This morning I ran my Cozy F1. I already tried the new setup last week with good results, but I had to sharpen the prop still.

This morning I sharpened it and I took 2 lipo's with me; 1 old one and a brand new one. First I ran with the old lipo. The Cozy F1 ran nicely with the hull floating above the water. The top speed was 35.0mph.
The new lipo improved the performance condsiderably; more punch and a top speed of 37.0mph

Some pictures and a video of today:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160604_113612533_zps10eypic9.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160604_113612533_zps10eypic9.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160604_113753924_zpszamn6cbb.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160604_113753924_zpszamn6cbb.jpg.html)

https://www.youtube.com/watch?v=5_CDCamKho0

[Dirk Jan]

This week I took my chemicals, mold and CF laminate to make a carbon fiber cowl. I waxed the mold one more time and applied a PVA releasing wax on top of that.

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160607_205140959_zpstfdmdfon.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160607_205140959_zpstfdmdfon.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_20160608_192327134.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_20160608_192327134.jpg.html)

I use a 200gr/m2 cf cloth. On top of that I apply a glass cloth of 110gr/m2 to make the surface more smooth. This cowl should become 20% lighter than my glassfiber cowl. I will also make another paint/decal design for this cowl.

[Tamelesstgr]

Man I got to start learning how to build wood boats or do a fiberglass mold, maybe both!

[grsboats]

Nice work!

[Dirk Jan]

Thanks guys :)

Last Saturday I went to a Dutch meeting for 152VO - class boats (www.152vo.de). I took my Cozy F1 as well and my buddy took some action photos:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_6556_zps6qm5fiuu.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_6556_zps6qm5fiuu.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_6645_zpsqcd0porf.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_6645_zpsqcd0porf.jpg.html)

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_6650_zpszlpmrtcu.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_6650_zpszlpmrtcu.jpg.html)

Old vs new: 1950's Foo Ling You - Utility Flatbottom (152VO class) against the Cozy F1 on the straight:

http://i29.photobucket.com/albums/c281/djcozijnsen/Cozy%20F1%20Tunnel/IMG_6895_zpsg3illxqd.jpg (http://s29.photobucket.com/user/djcozijnsen/media/Cozy%20F1%20Tunnel/IMG_6895_zpsg3illxqd.jpg.html)

[RandyatBBY]

Great build, Thanks for sharing I love the contrast of the blue to the yellow.

[lavigna]

Really amazing build. Thanks for taking the time to make the build thread.

[Dirk Jan]

Thank you!

[Ronnie Gilbert]

Do you still share these plans. I would like to have the first version. The ones with chins in the sponsons.

[Ronnie Gilbert]

Do you still share these plans . I would like to get a set of them for what I think was first one that had chine in the sponsons

[Dirk Jan]

Hi Ronnie,

You can find the plans online here:

http://www.rumrunnerracing.com/plans.html

Please scroll down the link and you will find them.

Have fun building it!

[Ronnie Gilbert]

Thanks for your fast response and also for the link to the plans. I don’t think I can do as good a job building but I’ll definitely give it a shot. The build I saw of yours was impressive. Again thanks
Ronnie Gilbert

[y.o.r.k]

Hi Jan,

I found the blueprint of your cozy F1 at Rumrunner Racing.
Congratulations, a really cool project!
Maybe I'll built this one too. I'm actually redrawing the plan in my 3D-Software.
There are two things which I'm not shure how to built them.
Thing 1:
Your ribs for the sponsons differs with the one in your photos.
In the Blueprints there is a recess, I think for a Stringer 5x5mm. Is this correct?
I think it should look like as in my screenshots.

Thing 2:
I don't know how to place the cowl in the correct position.
Where sits the cutting template in relation to the helling (part45).
Would it be possible to get a 3sides-view-drawing with the cowl?

And one more question. Where sits the center of gravitiy?

[Dirk Jan]

Hi y.o.r.k.

Nice to see your progress. You are right about the 5x5. I added it to the design later on, to make building them easier.

The front face of the cowl cutting template sits flush with the front face of the cowl centre rib.
CoG sits approx 30% from the back of the sponsons, but depends on many parameters, such as outboard angle, prop, total weight and so on.

By the way, I'm building the successor of the Cozy F1 right now. Bigger size with more modern looks. No drawings available yet. I need to finish it and test it myself first:https://uploads.tapatalk-cdn.com/20210609/c8dc983044a2b59471f9a748340e7559.jpg

Verstuurd vanaf mijn SM-G970F met Tapatalk

[y.o.r.k]

Thanks for the quick response. I tried to position the cowl as you described. Is this correct?
My ribs for the sponsons are a littel bit rounded at the top. This is the only change I did, I think it looks a little bit more modern.
I think/hope your "Cosy F1 Successor" is worth a new thread. I'm looking forward to this.

[Dirk Jan]

The bold top of the sponsons might be difficult to realize, as the sponson has a wing-shape length wise. A double radius in 2 directions in the same surface is not possible with a wooden sheet. But you could maybe use many small strains as top skin.

I do have a build topic of the Cozy F1 T800 in Dutch. Language might be difficult, but photos might interest you:
https://www.modelbouwforum.nl/threads/cozy-f1-t800-houtbouw-f1-tunnel.276072/

Thinking about an English build topic. It seems the interest on the forums have been decreased unfortunately.

Verstuurd vanaf mijn SM-G970F met Tapatalk

[y.o.r.k]

I startet to read your dutch built topic. Google Site-Translation makes me "reading Dutch. :thumbup1:

[Dirk Jan]

My Cozy F1 is still going strong. Currently running a 36mm 1.4 pitch prop. The outrunner has to work hard spinning this prop. Rpm and top speed decreased, but cornering is great with this prop.

https://uploads.tapatalk-cdn.com/20220728/0ed954bb90ade1229c36da2cf1cc63dd.jpg

https://uploads.tapatalk-cdn.com/20220728/9f7ce27e5df9ea704518daedcba83544.jpg

I made a small video. Including my Hydromite; 50cm hydro, running on 3S. It is a little ripper!

https://youtu.be/xklNVFCMsNQ

[Dirk Jan]

Hi fellow rc boaters, I made a cost breakdown video of my 23" F1 Tunnel.

My friend made an inboard version, which I also cover.

SXmzt7qb1a4

If you like to get the plans, let me know [emoji3577]

[BUMBLESPECIMOODA]

Ordered the 33". It'll be my birthday present to myself.

[Dirk Jan]

Thanks for the order Bumblespec. As we discussed, you will het his bigger brother: the 33" Cozy F1 T800.
https://uploads.tapatalk-cdn.com/20240225/3f159fd870baa4ca3d4489665de6fddf.jpg

Verstuurd vanaf mijn SM-S911B met Tapatalk

[Dirk Jan]

Last weekend, we ran 2 Cozy F1's head to head.
One with outboard (orange/yellow) and one with inboard setup (Blue/RedBull). Both run a 4S setup, and are very closely matched! It was great fun [emoji16].

https://youtu.be/Nr_tOfCZgeY

Verstuurd vanaf mijn SM-S911B met Tapatalk