Cozy F1 Tunnel - wood build

[Dirk Jan]

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

[Dirk Jan]

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.



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.

[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:





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.





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:







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

[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:

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[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/thread...tunnel.276072/

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

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[y.o.r.k]

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

[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.





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.

[MEDIA=youtube]SXmzt7qb1a4[/MEDIA]

If you like to get the plans, let me know

[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.


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[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 .

https://youtu.be/Nr_tOfCZgeY

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