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Thread: MICROMAGIC vs NANO

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  1. #1
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    Default MICROMAGIC vs NANO

    Having consulted the NANO Rules, I just tried to compare with a similar length model like the Micro Magic.
    There are some data that may be difficult to cope with.
    The NANO Sail Plan aspect ratio is rather high compared with the Micro Magic.
    The Main Luff is 900mm against the 980mm of the total Micro Magic height
    My preliminary calculations for the Nano shows a possible Sail Area of about 1700cm against the 1450cm of the MM, it can be less if both sails become narrower like the rigid sails of AC catamarans.
    Similar righting moment of the MM can be obtained with a bulb of about 275g, but the height of the CE may requires more weight in the bulb to get similar stability against wind pressure.
    No calculations made, is just a guess.
    I wonder about stability !
    No further comments!

    ClaudioD

    Here below the comparative templates.
    Attached Thumbnails Attached Thumbnails Click image for larger version

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    Last edited by claudio; 05-30-2017 at 07:28 AM. Reason: added text

  2. #2
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    Default Re: MICROMAGIC vs NANO

    Claudio, I use a 350g bulb in my 500g Footys.

  3. #3
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    Default Re: MICROMAGIC vs NANO

    A step forward for a wind of 12kt, the required bulb is of 582g. Added to the actual 330g of construction, we are above 900g for 500mm long boat.
    Sail area was reduced to 1095cm and keel increased to 240mm.

    If some one whish to scale down a RG65 from 655mm to 500mm length, will be surprised !

    Ideally a 500mm boat should weight 550g and the bulb 350g while the full construction shall be within 200g.
    If the Footy was constructed with 132g, not excluded to make it with 200g !
    Attached Thumbnails Attached Thumbnails Click image for larger version

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    Last edited by claudio; 06-04-2017 at 12:10 PM. Reason: added text

  4. #4
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    Default Re: MICROMAGIC vs NANO

    Having never been at a race, is there anything that says you HAVE to race with an A suit of sails?
    So you design your boat around a lower luff length, which would drop the COE (if I'm not mistaken) and mean that you could then have a shorter keelfin / lighter bulb.
    Sort of like when they changed from ridiculously large displacement engines to smaller engines with better handling?

  5. #5
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    Default Re: MICROMAGIC vs NANO

    That was only a comparison when found out that the MM bulb is available as spare part and weight only 376g attached to a Fin of 134mm length. This may also justify a short mast !

    Personally I would try about 525/550g bulb to obtain a total displacement of about 750g (ratio 70%) compared with the 860g of MM (ratio 47% which is very low).
    Need to verify if the total construction can be obtained below 225g.

  6. #6
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    Default Re: MICROMAGIC vs NANO

    My 3D-printed Footy weighs 482g ready to sail without rig.

    The bulb weight is 350g of the 482 total.

    My C rig is 24g, B is 34g, and A is 40g. The A rig mast height is 825mm.

    With C rig, then, the ballast ratio is 69%, with B it's 68%, and with A it's 67%.

    Though I haven't built a Nano yet, I see no reason why similar results can't be achieved with a boat in the 725-800g range.
    Last edited by mudhenk27; 06-03-2017 at 05:27 PM. Reason: spelling error

  7. #7
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    Default Re: MICROMAGIC vs NANO

    Here the PICO 1200 cm Sail Plan
    Swing Rig A
    Main Luff 850mm
    Jib at 22%
    Attached Thumbnails Attached Thumbnails Click image for larger version

Name:	SA1200cm.jpg‎
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  8. #8
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    Default Re: MICROMAGIC vs NANO

    I went to check some parameters and got my personal idea.

    It is obvious that when a boat is getting smaller, the uncompressed construction weights become the predominant factor.

    Increasing balancing weight (bulb weight) to compensate the relatively high aspect ratio of the Sail Plan make things more complicate.

    Ending up with an heavier model will not help to get acceptable performances.

    Actually my Construction Budget is 340g, that's includes Electronics, Rig1, Fin, Rudder, Hull-Deck, Supports. It may be larger !

    Adding a bulb of 500g, the final boat will be 840g at the buoy.

    Unfortunately the weight Ratio will be rather low : 500/840 =59.5% - (Class M >70%).

    One may use a bulb of 600g and the Ratio will become : 600/940 = 63.8% that is better, but the boat will be heavier imposing a larger Sail Plan to get some sailing performances, etc.

    The sail plan considered is 1350cm, larger plan possible, but lateral stability will be critical.

    NANO, a difficult Model to build unless construction weights are smaller and mast height shorten.

    ClaudioD

  9. #9
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    Default Re: MICROMAGIC vs NANO

    Andrew,
    Is not a question to race or not, the point is that lowering the main sail it also lower the CE position and this is helping to increase the lateral stability. Better would be to increase also the Fin depth.
    Cheers

  10. #10
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    Default Re: MICROMAGIC vs NANO

    While others talk about NANO, myself a tried to design a PICO for about 750g and 1350cm of sails ... hoping that she will not met too much wind !
    Attached Thumbnails Attached Thumbnails Click image for larger version

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