Cambered Panels Project Write-up

  • 08 Nov 2013 23:36
    Message # 1431048
    Arne Kverneland reported his resurrection of this project on Friday, 25th October 2013. [Moved here from the Update and Expand Current Sailplans project thread.]

    My project of adding a chapter to  "The Cambered Panel Junk Rig" write-up has been idle for a good while now, mainly because I have played with real boats. Now that the sailing season is over, mostly, I hope to  have another go on it. I have been wondering on how to write  chapter 4; the one about designing each sail. I have come to the conclusion that I'd rather make a series of CAD-generated "master sailplans", which range from an AR= 1.80 to 2.20, in steps of 0.05 (..sails outside these limits can be made by adding or subtracting panels...).

    Each sailplan will contain four sheets. I have already made a few of them (almost finished). The sail for this summer's project, Frøken Sørensen, came from such a master sailplan where the AR=1.95.

    I use real dimensions on the master sailplan and they have one dimension in common: The baseline (chord) =5.00m. The resulting master sails end up with areas from about 35 to 40sqm. From there, one can scale up or down as needed.

    Today I just uploaded Q-CAD ver. 3.0 to my brand new pc, so I have quite sharp tools to work with.

    Hopefully the weather will encourage me to stay at the pc a bit every day. It could be quite useful to be able to just grab a sail shape from the shelf when a design is needed - not least for myself...

    Paul Thompson replied, 25th October 2013

    Arne, If you do not have Qcad version I'd urge you to get it. It's by far the best Qcad to date and significantly improved over version 3.0.

    I assume that you are aware that you can scale your drawings  independently on each of the X and Y axis. So you are not stuck with the 5M base if you want to change it.

    Arne replied 25th October 2013

    I'll find a way to download the latest version, thanks

    About stretching a sail plan in only one direction, I'll check it, but my prime idea here is to keep all sails with equal area in each panel. If I keep that with stretching the sail, then fine

    PS: But then I also prefer equal length on all the  battens, so I guess I'll do  the job manually....
    Last modified: 08 Nov 2013 23:39 | Anonymous member
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