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Thread: Cozy F1 Tunnel - wood build

  1. #1
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    Default Cozy F1 Tunnel - wood build

    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:





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






  2. #2
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    Next couple of photos:









    And starting with the tunnel itself:




  3. #3
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    Build post #3:

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







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







    So far for now. More updates will follow soon!

  4. #4
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    Build post #4:

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












  5. #5
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    Build post #5

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





    Servo / receiver plate:



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





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


  6. #6
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    Very nice building...looking forward to see some action videos.Thanks Gill
    GO FAST AND TURN RIGHT !
    www.grsboats.com.br

  7. #7
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    Thanks Gill! Here's the next build post:

    Making the cowl mold:



    Power plugs from esc to the motor:



    The hull with electronics installed:








  8. #8
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    wow ...always impressed with scratch built boats etc...great job
    MY RETIREMENT PLAN?????.....POWERBALL
    74 vintage kirby clasic hydro, pursuit mono, mg, 47'' mono, popeye hydro...

  9. #9
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    The mold is finished:



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



    The cowl came out good:



    Applied some base coat:



    And finished except for the paint!



    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.

  10. #10
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    Beautiful!
    Paul Upton-Taylor, Greased Weasel Racing.

  11. #11
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    Beautifully built! Thank you for documenting your F1 build. I am very interested in building one myself, PM sent. Thank you!
    Cheers, Thompson
    Cheers, Thompson
    1/10 1954 Breathless U-22, Tahoe Yacht Club | 1/16 1958 Dumas Thiftway Too, built in '92

  12. #12
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    Thanks! :) You got the plans in your mail box.

  13. #13
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    Thank you, Danke
    Cheers, Thompson
    1/10 1954 Breathless U-22, Tahoe Yacht Club | 1/16 1958 Dumas Thiftway Too, built in '92

  14. #14
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    great work mate! very cool boat to run too by the looks of your video :)

  15. #15
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    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.

  16. #16
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    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 :)




  17. #17
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    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
    Cheers, Thompson
    1/10 1954 Breathless U-22, Tahoe Yacht Club | 1/16 1958 Dumas Thiftway Too, built in '92

  18. #18
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    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.



    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.


  19. #19
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    I painted the mid section of the hull. In these pictures, the real color shows better.



    The window is painted on:





    Painted a black stripe between the two colors:



    Next update the hull will have the decals on it.

  20. #20
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    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.






  21. #21
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    Awesome! Love the decals, this will look great on the water.

    The boat stand is very nice too.
    Cheers, Thompson
    Cheers, Thompson
    1/10 1954 Breathless U-22, Tahoe Yacht Club | 1/16 1958 Dumas Thiftway Too, built in '92

  22. #22
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    Scratch built and absolutely beautiful!! I wish I had the time or patience for that.
    NEVER SATISFIED RACING
    Fine Design 32 V-Hull 4082+6s

  23. #23
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    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 :)
    Last edited by Dirk Jan; 04-29-2015 at 01:08 PM.

  24. #24
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    Quote Originally Posted by Dirk Jan View Post
    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

    Cheers, Thompson
    1/10 1954 Breathless U-22, Tahoe Yacht Club | 1/16 1958 Dumas Thiftway Too, built in '92

  25. #25
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    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 :)



    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

  26. #26
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    Plans are available online: http://www.rumrunnerracing.com/plans.html

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

  27. #27
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    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.





    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.

  28. #28
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    ...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:












  29. #29
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    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.




  30. #30
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    Great building and you must be proud of your boat..awesome looking on water..congrats.Gill
    GO FAST AND TURN RIGHT !
    www.grsboats.com.br

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