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Thread: 10R & Narrow Deck

  1. #1
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    Default 10R & Narrow Deck

    I could not resist to think about the legendary 10R Class.
    With that in mind, I drawn my first 10R combined with a Narrow Deck.
    Here a short vue of the ESTEREL-10R with Low Prismatic Coefficient.
    Underway another one with High Prismatic Coefficient.
    The Sails Plans are still to be made.
    Interesting to observe that shadows shapes of the Narrow Deck produce also a favorable static balance of the hull observing the Centre of Flotation when tilted by 25°.
    ClaudioD
    Attached Thumbnails Attached Thumbnails Click image for larger version

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  2. #2
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    Default Re: 10R & Narrow Deck

    Another ‘classic’ 10R Hull Plan with 0.60 as Prismatic Coefficient !
    It should be good for hard wind conditions although relatively short and lighter with less then 6.0kg.
    Sail Plans and Appendages not yet drawn...
    ClaudioD
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  3. #3
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    Default Re: 10R & Narrow Deck

    This instead is my interpretation of a 10R old style “Vintage"
    The peculiarity is related to the possibility to change, within a certain limit, the displacement from about 5200g to 5890g by simple modification of the Bulb weight.
    The Displacement could be adapted to the wind strenght.
    This model is a little longer in order to permit classic overhangs.
    Sail Plans are under way and Appendages are similar to the first Esterel model
    ClaudioD
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  4. #4
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    Default Re: 10R & Narrow Deck

    In spite of lack of interest for 'big models', here the general view of my last "All Round" 10 Rater without Narrow Deck.
    PC close to 0.58
    Shadows Plans will be published soon
    ClaudioD
    Attached Thumbnails Attached Thumbnails Click image for larger version

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  5. #5
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    Default Re: 10R & Narrow Deck

    Here some refinements about the last design. Two drawings added to shows the design variations.
    The difference stays with the width of the stern all other parameters being unchanged.
    This last feature is particularly remarked on the tilted shadows drawing where the stern is in contact with the water level suggesting that the Water Line Length is getting greater as expected at 35° of tilt.
    Obviously this is a “static view” with a flat water level.
    Added the first Sail Plan, according to Rules, for type A Rig
    ClaudioD
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  6. #6

    Default Re: 10R & Narrow Deck

    interesting you said lack of interest of big boats. We just launched the Irish A class Association here.
    Was not really interested by them for a long time as I didn't get the concept of the short keel but having sailed one and bought one for less than an IOM ok it needs a bit of TLC she sails well and it fully functional. It's a Sweet 9 just under 24Kg and just short of 2m long.

    Surprisingly to sails - I actually enjoyed racing it but lifted the foot of the pedal as the wind increased a bit as you can feel their weight and they don't react like IOM but rather closer to full size one. Yet I got hooked and now it is my next project after I finish building my IOM XP.
    No race is finished till the finishing line is crossed !

    IOM Goth XP (Frank Russell Design), Frank RD sails, RMG winch
    A Class Sweet 9, Frank RD sails and RMG Winch
    Replica of Jet Service 2 1.7m in sailing condition
    Mni40 - Cobra sailed again in Nov 12. Great fun !
    Mini40 - Coyote in construction
    Dragon Force RG65 in sailing condition
    2m Trimaran project: first draft drawings done.

    www.IOMIRELAND.org
    www.ACLASSIRELAND.org

  7. #7
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    Default Re: 10R & Narrow Deck

    Hi Gilbert,

    It is true since no many visitors watched the tread, no one single comment, you are the first.

    Interesting sailing with an A class! Hope you will continue to enjoy it !

    Of course 24kg is out of my range of thinking.

    I assume that I should stay inside the half of that weight as I did it with the Enterprise and Tuiga to make the transport easier .

    My 10Rater are below 6kg and therefore largely appreciated by me while they should be very nice models to drive.
    Probably with 1.5kg more then a Class M shall introduce a different feeling.

    At this level of design what count for me is the waterlines shape fairing and hull forms as to render very fluid the progression in the water while reducing drags and wave formation. These models could be used without RC Control for Free Sailing. My design teachers are Priest & Lewis with Model Racing Yachts of 1954.

    RC controls make the life easier but often masking the hull design defects.

    Actually, other then the Narrow Deck model being part of the 'family', I do have drawn a Low Prismatic and an High Prismatic such that as funtion of the local predominant weather, one can be built one or the other.

    Cheers
    Claudio

  8. #8
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    Default Re: 10R & Narrow Deck

    I received some comments and suggestions where there is interest to have long overhangs to obtain longer LWL when the boat is tilted.
    My initial idea of fixing the LOA to less of 1.50mt is something that I'm fixed upon since ever to limit the transportation problems.
    This is why my J-Class designs are also limited to 1.50mt.

    Now accepting the suggestions I decided to elongate the upper part of the hulls while keeping the same immersed volume.
    Two models designs, one as ‘classic’ look and one as more modern ‘Narrow Deck’.
    Not escluded to use a reversed nose on ND1.
    The LOA is now fixed at 1610mm against the original at 1485mm; the overhangs are of 180mm.
    See some images below where the shadows are already at 100% scale that can be directly printed on A4 page.
    Both models will use Karman fairing at the top of the Fin. In principle the Karman fairing should be part of the hull (construction under evaluation), similarly at the bottom when intefacing the bulb.
    ClaudioD
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    Attached Files Attached Files
    Last edited by claudio; 11-29-2014 at 07:04 PM.

  9. #9

    Default Re: 10R & Narrow Deck

    Claudio,

    I really like the look of the Esterel 10R - ND2. I think you have just provided me with a Winter project. Thank you!

    Cheers,
    Eric
    Eric Rosenbaum
    IOM, RG65, MM, Seawind, Vic

  10. #10
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    Default Re: 10R & Narrow Deck

    Thank you Eric,
    if you need more about shadows let me knows.
    Fortunate you, my Lab is not yet ready !
    Cheers
    ClaudioD

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