Unless I'm way off base, here's what the results would be if I selectively delete 1 or 2 of the 3 sail meshes:

I have numbered the sail #1 to #6 for easyer reference (I'm not a sailor so I don't know the names of the individual sails...).

Deleting mesh 'sail1_1'  will leave the following sails visible:
#1 and #5 - Both full and furled (not acceptable)
#3 - Full only
#6 - Furled only

Deleting mesh 'sail2_1' will leave the following sails visible:
#2 and #4 - Both full and furled (not acceptable)
#3 - Furled only
#6 - Full only

Deleting mesh 'sail4_1' will leave the following sails visible:
#1 to #5 - Both full and furled (not acceptable)
#6 - Furled only

Deleting mesh 'sail1_1' and 'sail2_1' will leave the following sail visible:
#6 - Full only

Deleting mesh 'sail1_1' and 'sail4_1'  will leave the following sails visible:
#1 and #5 - Both full and furled (not acceptable)
#3 - Full only
#6 - Furled only

...and finally deleting mesh 'sail2_1' and '4_1' will leave the following sails visible:
#2 and #4 - Both full and furled (not acceptable)
#3 - Furled only

I hope I got all the combinations right. In any case, deleting one or two of the sail meshes will leave an unrealistic combination of simultaniously full and furled sails which is simply not acceptable except in one case (deleting 'sail1_1' and 'sail2_1' ) where only sail #6 will be full and none of the others will show at all...

...so - I still have the dilema