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Thread: MICROMAGIC vs NANO

  1. #31
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    Default Re: MICROMAGIC vs NANO

    Quote Originally Posted by mudhenk27 View Post

    Claudio, are you sure you aren't being too conservative? My Footy A rig (based on Claudio Vigada's Easy Rig III) is 1910cm2. I'm sure won't stand up in 12kts, but I don't see why it would have to.
    Not my fault if Bernoulli did not considered Footy in a protected environment !
    My static calculations are simply based on the Bernoulli law application and, of course, conservative by definition.

    see: https://www.theamya.org/sails/146_SailsPart2.pdf
    Last edited by claudio; 06-08-2017 at 07:07 AM. Reason: added reference

  2. #32
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    Default Re: MICROMAGIC vs NANO

    A review of the static Footy sailing conditions with a bulb of about 300g and 1.9dm² of sail area, the calculations reveal that with a Wind of 2.5m/s the tilt = 30° and with 3.0m/s the tilt = 45°.
    Tolerated +10% Wind Speed when CE below 50/60cm from water.
    Attached Thumbnails Attached Thumbnails Click image for larger version

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  3. #33
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    Default Re: MICROMAGIC vs NANO

    Here the PICO 1200 cm² Sail Plan
    Swing Rig A
    Main Luff 850mm
    Jib at 22%
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  4. #34
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    Default Re: MICROMAGIC vs NANO

    Claudio, I've never measured the wind speed for my Fooy, but your calculation seems to be in the ballpark.

  5. #35
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    Default Re: MICROMAGIC vs NANO

    In this game it is difficult to be more precise since a boat is not like a car driving on a solid element.

    2 out of 3 elements cannot be scaled and their implications predominates more and more as the boat get smaller.

    An interesting book: "The Forgotten Factor" of CA Marchaj

    Here what I consider a pleasant sailing with smooth maneuvers with the AC100 and RG65 and 3 kt of wind and calm environment:
    https://youtu.be/R4MM_z_q3aI

    I think is time for me to go back to my Class M "1290"...

  6. #36
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    Default Re: MICROMAGIC vs NANO

    Speaking of car analogies (which is what I always use because I'm more comfortable with them) I had a penny drop yesterday.

    I have been thinking of the sail plans as the "engine" of the boat.
    bigger sailplan = more power.

    Correct me if I'm not mistaken, but the wind is the engine, not the sailplan.
    The sailplan would be the gear box.

    WRT the Pico, If you have can give/upload the stations I'll build it in CAD and upload the STL/OBJ files for anyone wanting to try print them.
    Bill also kindly supplied me with his IGES file that I've been playing with. I've successfully converted it into an STL and with his blessing I can also upload that..... I'll post in the "New class" thread

  7. #37
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    Default Re: MICROMAGIC vs NANO

    Andrew, I'd appreciate your waiting just a bit. While I'm confident that my Nano will sail well, I've never been comfortable with releasing plans to the general public before they are fully tested on the water. There are a couple of them being built as we speak, so it shouldn't be too long. Once some testing is done, and any resulting tweaks made, then I'll make sure you get a new file that you can release it wherever you want.

    Thanks.......Bill

  8. #38
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    Default Re: MICROMAGIC vs NANO

    Of course

    Sorry, I just get carried away lol.

  9. #39
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    Default Re: MICROMAGIC vs NANO

    Hi Andrews,
    PICO is a difficult model that personally I will not build, since I prefer bigger models !!!
    Free plan, in attachment see PDF files of PICO-1C.
    Shadows are at scale 1:1.
    My worries remains with the construction weight that is actually limited to 233g.
    Servo Arm not useful unless positioned far away from LCB. Drum servo retained but the weight is 45g already.
    Swing Rig retained since lighter.
    Overweight will move up the floating line, may be still acceptable if limited to 1-2mm max since the LWL is of 480mm.
    Cheers
    Attached Files Attached Files
    Last edited by claudio; 06-09-2017 at 01:45 PM.

  10. #40
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    Default Re: MICROMAGIC vs NANO

    Just elaborated the 3 swing rigs A, B and C. As said before the swing rig at this size level is lighter because Stays, Shrouds, Spreaders,Turnbuckles and supports are absent. For those more interested about Swing Rig see : Ivor Bittle website "the RC Racing Yacht Explained" 'Chapter 10' : http://www.ivorbittle.co.uk/
    Attached Files Attached Files
    Last edited by claudio; 06-11-2017 at 04:49 AM.

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