Looking for AeroRig sail drawings

Discussion in 'Hydrodynamics and Aerodynamics' started by Forecaddie, Oct 1, 2023.

  1. Forecaddie
    Joined: Apr 2023
    Posts: 48
    Likes: 6, Points: 8
    Location: Brisbane Australia

    Forecaddie Junior Member

    I have googled and can’t find drawings of Aero Rig sail construction. Looking for ideas how they pivot.
    Gear?
    Bicycle sprocket?
    Bearings?
    Intersection of boom and mast?
     
  2. Robert Biegler
    Joined: Jun 2017
    Posts: 195
    Likes: 108, Points: 53
    Location: Trondheim

    Robert Biegler Senior Member

    The earlier Harryproa designs had aerorigs. Perhaps you can find something at Previous designs – Harryproa http://harryproa.com/?cat=59 Angle of the rig to the boat is definitely controlled by sheets, not gears.

    Also, I am not sure whether aerorig might be a brand name. You should also search for balestron rig.
     
  3. HJS
    Joined: Nov 2008
    Posts: 496
    Likes: 135, Points: 43, Legacy Rep: 288
    Location: 59 45 51 N 019 02 15 E

    HJS Member

    upload_2023-10-7_19-18-58.jpeg
     
    revintage likes this.
  4. Forecaddie
    Joined: Apr 2023
    Posts: 48
    Likes: 6, Points: 8
    Location: Brisbane Australia

    Forecaddie Junior Member

    Thank you!
     
  5. Forecaddie
    Joined: Apr 2023
    Posts: 48
    Likes: 6, Points: 8
    Location: Brisbane Australia

    Forecaddie Junior Member

    yes that’s what I am looking for balestron rig. Its how the gooseneck is constructed and how the mast step rotates and without friction. Probably like how a laser mast sits in the deck.. but not sure. Maybe I am overthinking.
     
  6. HJS
    Joined: Nov 2008
    Posts: 496
    Likes: 135, Points: 43, Legacy Rep: 288
    Location: 59 45 51 N 019 02 15 E

    HJS Member

    Here is my version from 1967.
    JS
    upload_2023-10-13_16-0-53.jpeg upload_2023-10-13_16-2-20.jpeg
     
    Manfred.pech likes this.
  7. Robert Biegler
    Joined: Jun 2017
    Posts: 195
    Likes: 108, Points: 53
    Location: Trondheim

    Robert Biegler Senior Member

    You have choices. I think the early Harryproas didn't have a gooseneck because the boom was bonded to the mast. Malcolm Smith's MI6 proa had a boom that consisted of compression members on either side rising well above the foot of the sail, then down to the tack of the jib and the clew of the main, along with some wires and lines in tension. That didn't have a gooseneck, either. I can't find any online pictures of the boat any longer, but I see that Malcolm Smith has a youtube channel, and perhaps you can contact him through that: https://www.youtube.com/@ICnutter

    Shuttleworth designed an unstayed balestron rig: article aero design https://www.john-shuttleworth.com/52AeroDesign.html

    Elf Aquitaine had a stayed Balestron rig: https://www.histoiredeshalfs.com/50 multis/G DF9 Elf.htm

    I think those engineering issues are the same as for any unstayed rotating mast. Considering how much the masts on this Schionning catamaran bend, I guess they must rotate: Radical Bay 800 Catamaran | Schionning Designs International https://schionningdesign.com/radical-bay-800/ I remember that Team Phillips had a ball and socket joint at the mast foot, though initially undersized.
     
    Last edited: Oct 13, 2023
  8. gonzo
    Joined: Aug 2002
    Posts: 17,492
    Likes: 2,027, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    If you want to minimize the friction, two ball bearings will do the trick. You can also make your own roller bearings with two concentric pipes and rollers of whatever material is available.
     
  9. Forecaddie
    Joined: Apr 2023
    Posts: 48
    Likes: 6, Points: 8
    Location: Brisbane Australia

    Forecaddie Junior Member

    thats interesting. might look at PET (or whatever its called... the white material used for cutting boards) rods - and use as rollers. thanks
     

  10. Forecaddie
    Joined: Apr 2023
    Posts: 48
    Likes: 6, Points: 8
    Location: Brisbane Australia

    Forecaddie Junior Member

    Mate, Thank you so much!!! your links are gold!
    Shuttleworth- didn't realise the loading requirement, but my boat won't be that big..
    Elf Aquitaine- good drawings- whished I could read French LOL
    Schionninning_ the best.. they used a tow ball for the mast step!! I am using that and will look at mixing epoxy and graphite for mast bearing-
    I've downloaded the dwgs for more ideas.
    Thanks Heaps heaps
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.