P1 Puma RIB racing-scratch building

Discussie in 'Speedboten' gestart door Dim L, 3 okt 2021.

  1. Dim L

    Dim L

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    Thank you unusual! I add dimensions on the plans and fortunately they are 100% accurate!
    To be honest I prefer cutting the templates by myself.
    Unfortunately it is not possible to flatten a surface in Fusion 360. It would be very useful for skinning.
     
  2. Tamiya1970

    Tamiya1970

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    Looking good !
     
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  3. Unusual RC

    Unusual RC

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    That is the downside of free software. It might be possible in Fusion, however it could be a feature you have to pay for :(

    I know it can be done in Inventor, solid edge and SolidWorks (not the basic versions)

    A work around can be making use of the sheet metal functionality. However you are then limited to single direction curved surfaces.
     
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  4. Dirk Jan

    Dirk Jan Forum veteraan

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    Having the ribs printed 1:1 is already a huge plus.
    Flatten the surfaces for making the plating contours is in my opinion not a huge added benefit. I never used it, although I know the feature. By hand building, you will always find some imperfections. Using paper and cardboard for making templates of the plating works maybe even better in that case.
     
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  5. Dim L

    Dim L

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    I tried my new mini table disc. I cut the transom using 4mm plywood. Very satisfied, it is fast, accurate producing very clean cuts. Some photos...
    IMG_20211120_085714.jpg IMG_20211120_090326.jpg

    IMG_20211120_090431.jpg

    IMG_20211120_090607.jpg
     
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  6. Dim L

    Dim L

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    This is very Interesting Jan. I thought that having the flattened surfaces would be a huge benefit to speed up the process and improve accuracy but I was wrong. Good to know, thank you.
     
  7. Unusual RC

    Unusual RC

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    This mini saw table was a bargain?
    Indeed a nice addition to your hobby-cave ;)
    I have seen them from Proxxon among other, high quality but also it breaks your bank!
     
  8. Dim L

    Dim L

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    Yeah sure. One of the best buys I ever made. 63 € full aluminum, 4-5 extra disc's and highly accurate. Proxxon is about 4 times more expensive at least here in Greece. High Chinese quality :yes:
     
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  9. Dim L

    Dim L

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    Another useful tool is the table sander
    IMG_20211120_132618.jpg

    The final result
    IMG_20211120_134458.jpg

    I think it's quite accurate.
     
  10. Dim L

    Dim L

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    Update #2
    Construction of the building board.
    Step 1: Printing the top view in multiple A4 papers using Fusion 360 (for those interested in how I print my plans in A4 printers, see also a useful video: ).

    a) Make a sketch with the required number of rectangles to cover the full top view of the hull using the dimensions of an A4 paper (210 mm X 297 mm). Be sure that the rectangles overlap each other, e.g. :
    upload_2021-11-21_9-36-55.png

    b) Then File -> New drawing -> From Design then on the new tab, Create Drawing, select Sheet size: A4
    c) Adjust the plan so as the rectangle coincides with the A4 paper, e.g.:
    upload_2021-11-21_9-54-17.png

    d) Then File -> Print and you can either print as pdf and save it or send it to the printer. Here the first piece of the drawing on pdf:
    upload_2021-11-21_9-55-32.png

    To be continued...
     
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  11. Dim L

    Dim L

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    Step 2: assemble carefully the A4 papers on a piece of plywood securing with tape and checking the length.


    IMG_20211121_135908.jpg

    Step 3: cut pieces of plywood and screw on the board exactly where the ribs should be according to the plan.
    IMG_20211121_141457.jpg

    IMG_20211121_145805.jpg

    Step 4: cut another slice of plywood to secure the ribs.
    IMG_20211121_150105.jpg

    Step 5: do that for another x times where x is the # of ribs... :confused: (a for loop :D)

    Thank you guys for your patience, have a nice Sunday afternoon..
     
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  12. Dim L

    Dim L

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    Update #3
    Some progress with the ribs.
    IMG_20211122_201125.jpg

    IMG_20211122_201131.jpg
     
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  13. Dirk Jan

    Dirk Jan Forum veteraan

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    Nice work Dim. It seems you did not draw the stringers (wooden reinforcement lath) in the ribs. Wil you add them later on?
    Also, I think it wil be a challenge to make a tapered tube with the shape already in the wooden ribs. How will you make them? Skin between the ribs with wooden strips, or hard foam?
    I don't mean to criticize, just some questions to keep you sharp:) You add a lot of nice activity / projects in this forum!
     
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  14. Dim L

    Dim L

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    You are right Jan. I didn t manage to draw them even if I wanted to. For some reason the sweep did not work properly in Fusion...:confused:. You know I am still a beginner...and some things I try they just don t worko_O. I don't know if I add them later.

    Regarding the tubes I am planning to add hard foam between the ribs and sand them down carefully to the wooden part just like cosy. I have done something similar at the beginning of the project with balsa and seemed to work nicely (see my first photos)

    I think that the hard foam will strengthen the hull and maybe the stringers are not necessary. Moreover, I am planning to apply fiber and epoxy on both sides of the hull plus the ribs are quite dense. I also plan to fill with polyurethane foam at the bow. All the above-mentioned I think that will strengthen the hull.

    No worries Jan, I do not take it as critisim but as sharing opinions and experiences. ;) thank you for your nice words.
     
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  15. Dim L

    Dim L

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    Update #4.
    I cut a number of 4x3 stringers with my mini table saw to enhance the hull as discussed with Jan and I also cut some more ribs. The plans changed slightly to account for the stringer cuts to the ribs.
    I left the center stringer into the water overnight to be able to bend it smoothly.

    IMG_20211205_124850.jpg
     
  16. Dirk Jan

    Dirk Jan Forum veteraan

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    Looking good!
     
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  17. Dim L

    Dim L

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    Update #5.
    I changed somewhat the design of the hull and I had to re-cut the ribs and re-construct the construction board. This is the progress I ve made so far. IMG_20211228_161642.jpg

    IMG_20211228_161708.jpg

    IMG_20211228_161742.jpg
     
  18. Georgeoepts

    Georgeoepts

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  19. Dim L

    Dim L

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    #update 6.
    Starting with the sponsors using 3x2 balsa stripes and CA glue.
    IMG_20220106_100334.jpg

    IMG_20220106_100402.jpg

    IMG_20220106_100407.jpg


    IMG_20220106_100439.jpg
     
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  20. Unusual RC

    Unusual RC

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    I love it when your CAD model comes to life in the real world!
    Most of the time I am shocked by the true size ;)
    From a screen or a 2D print it is still hard to get a good feel of the true size
     
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