P1 Puma RIB racing-scratch building

Looks very nice so far .
Love the wood builds

 

Nice work on the tubes! Great project, it must look nice on the water when finished

 

You are absolutely right Unusuall!!! Especially without the tubes the hull looks so small.

 

Thanks Jan! The tubes must look nice and smooth when finished, they are key component of the hull.
I am also planning a homemade outboard for this hull using the cover I am preparing for the mini tfl
.

 

Thanks a lot Alex! I am also planning to laminate both the inside and the outside of the hull with 110 and 50 gr/m2 cloth, respectively.

 

Update #7
Time for planking.









I use 1mm ply and solid balsa for the nose.

 

Cool ,looks very good Dim!

 

Thanks Alex !

 

Update #8
The planking the bottom of the hull is finished.








Next step is to laminate the bottom and work on the spray rails which is a demanding task.
Then I will unscrew the hull from the construction board and I will start working on the tubes and laminating the inner of the hull.

 

Forgot to upload a very first try of diy outboard.






8 mm aluminum, 4x5 brass tube, table power drill to mill the aluminum.

Have nice week.

 

Last picture: the calculations look daunting

 

haha!!!!
I just forgot to remove my notebook from the desk !!!!

 

The tubes were too fragile to be able to work with. So, I woke up early this morning to try laminating the inside of the tubes with a 110 gr/m2 fiber. It may need a second layer.
I also noticed that it easier to work with smaller overlapping fiber pieces.

 

The keel needs reinforcement and an effective way to close the gap between the two sheets.


I worked as follows. First, I chopped some residual carbon fiber with the rotary cutter.


Then, I mixed the chopped fiber with epoxy resign (27 gr) and I applied to the middle of the hull with my finger or a piece of wood.

 

Nice ,looks pretty solid Dim.

 

Thanks Alex!
I checked the hull this morning and indeed the keel is very solid now.
The tubes are reinforced with CF too.

 

Update #9
The inner of the hull is laminated with 180gr/m2 carbon fiber.
First, I aplly a layer of epoxy resign and I let it cure for 2-3 hours.
Then I laminate with cf applying pressure by hands and I let it another 6-7 hours to cure.
Finally, I apply a final a layer of epoxy resign.

 

Great to see this build Dim! It becomes a really nice hull and something different from the more regular V hulls

One note: the epoxy layer after curing the laminate has no additional benefit for strength. Actually, less epoxy is better if I read from the experts. On the other hand, it does work for sealing the hull.

Looking forward to the next updates. In a few months boating season starts again!

 

Thank you very much Jan!! I really want to have the boat ready till the summertime but it seems a bit difficult.
I am very curious about its sailing behaviour especially on rough sea.

Maybe I did not express myself correctly.
The first layer of epoxy is applied on wood and after 2 3 hours when it is sticky enough I apply the CF. Thus, the first layer of epoxy is only to stabilize (glue) the CF on the hull and bend more easily over the corners, at this stage the CF is not laminated. In the final step, I apply epoxy resign on the CF which is glued on the hull.
But you are right, I generally try to use as less epoxy as it is feasible.

 

Full carbon hull !


Time to clean my workbench.