Steve and Dave Clarks UFO

Discussion in 'Multihulls' started by Doug Lord, Aug 24, 2016.

  1. Doug Lord
    Joined: May 2009
    Posts: 14,298
    Likes: 124, Points: 73, Legacy Rep: 1362
    Location: Cocoa Beach, Florida

    Doug Lord Flight Ready

    Unidentified Foiling Object:

    Weight is 52 Kg.
    8 and change meters of sail.
    Two T foils, wand on main foil.
    Foils retract between the hulls for upright launch and recovery.
    Floats upright at the dock.
    Closer to the Laser price point than the Waszp price point.


    [​IMG]
     
  2. Doug Lord
    Joined: May 2009
    Posts: 14,298
    Likes: 124, Points: 73, Legacy Rep: 1362
    Location: Cocoa Beach, Florida

    Doug Lord Flight Ready

  3. Tom.151
    Joined: Jul 2009
    Posts: 185
    Likes: 2, Points: 18, Legacy Rep: 38
    Location: New England, USA

    Tom.151 Senior Member

    Interesting... looks like two (boom) sprits look to be going to the end of the spreaders.
    Never seen anything like that.
    Anyone else seen that?
     
  4. Doug Lord
    Joined: May 2009
    Posts: 14,298
    Likes: 124, Points: 73, Legacy Rep: 1362
    Location: Cocoa Beach, Florida

    Doug Lord Flight Ready

    Ufo

    I've never seen it before and I'm not sure I understand how it works. One possible practical cost saving element is that the booms don't have to be curved like a "normal" wishbone boom.
    It will be interesting to see how this develops-apparently the first group of them is being produced right now.
     
  5. Gary Baigent
    Joined: Jul 2005
    Posts: 2,877
    Likes: 60, Points: 48, Legacy Rep: 509
    Location: auckland nz

    Gary Baigent Senior Member

    It's a clever, double boom variation of the ancient sprit and the "diamonds" and booms spreader, keep the position stable. Well, that's how I see it.
     

    Attached Files:

    • boom.jpg
      boom.jpg
      File size:
      99.8 KB
      Views:
      518
  6. Doug Lord
    Joined: May 2009
    Posts: 14,298
    Likes: 124, Points: 73, Legacy Rep: 1362
    Location: Cocoa Beach, Florida

    Doug Lord Flight Ready

    Dominion 2-HW

    I find Steve and Daves boat very interesting. One reason is that since last June I've been building an RC model of a design of mine that is an updated version of Dominion-the first tunnel hulled scow in 1898- using a version of Hugh Welbourns Quant 23 foils and inspired by Hughs work on the Quant 23. A 100% self-righting foiler. Amazingly, somewhat similar thinking in terms of hull design for a small foiler! If it was scaled up it would probably work well at 16' as a singlehander.

    [​IMG]


    20 year old "B" test rig-"A" rig is much bigger and designed to work with a Trapeze Power Ballast System. Good chance it will foil with the "B" rig and no movable ballast:

    [​IMG]
     
  7. Doug Lord
    Joined: May 2009
    Posts: 14,298
    Likes: 124, Points: 73, Legacy Rep: 1362
    Location: Cocoa Beach, Florida

    Doug Lord Flight Ready

    Ufo

    A new shot of UFO:

    [​IMG]
     
  8. basil
    Joined: Apr 2005
    Posts: 148
    Likes: 7, Points: 18, Legacy Rep: 55
    Location: aUSTRALIA

    basil Senior Member

    Hi Doug,

    What am I missing here? Where does your model fit into the Steve and Dave Clark UFO story?

    Regards

    Tony
     
  9. Gary Baigent
    Joined: Jul 2005
    Posts: 2,877
    Likes: 60, Points: 48, Legacy Rep: 509
    Location: auckland nz

    Gary Baigent Senior Member

    Egomania and imbalanced thread pollution perhaps?
     
  10. Doug Lord
    Joined: May 2009
    Posts: 14,298
    Likes: 124, Points: 73, Legacy Rep: 1362
    Location: Cocoa Beach, Florida

    Doug Lord Flight Ready

    ========================
    Both catamaran/tunnel hull foilers started independently of each other. Foil systems are completely different but the platforms are similar and a hell of an interesting coincidence. The Welbourn foils are among the easiest of the new foils(and foilers) to learn to fly.
    Steve and Daves boat is likely to be one of the most inexpensive of the new foilers-it's an exciting development!

    photo posted by red tuna on DA:


    [​IMG]
     
  11. basil
    Joined: Apr 2005
    Posts: 148
    Likes: 7, Points: 18, Legacy Rep: 55
    Location: aUSTRALIA

    basil Senior Member

    There is no such thing as coincidence.

    I think I like Gary's explanation best
     
  12. Doug Lord
    Joined: May 2009
    Posts: 14,298
    Likes: 124, Points: 73, Legacy Rep: 1362
    Location: Cocoa Beach, Florida

    Doug Lord Flight Ready

    Ufo

    =============
    I just bet you do......
     
  13. waynemarlow
    Joined: Nov 2006
    Posts: 373
    Likes: 16, Points: 18, Legacy Rep: 134
    Location: UK

    waynemarlow Senior Member

    I find it quite interesting that the UFO is probably the first of the latest crop of foilers to have the front foil ahead of the mast and thus making both foils carry almost equal weight distribution if we take into account where the sailor is. I've long thought this should be the case as we could then have smaller lifting foils.

    But almost all so called foil experts say this is wrong, any of you knowledgable foilers want to comment on the pros and cons.
     
  14. Doug Lord
    Joined: May 2009
    Posts: 14,298
    Likes: 124, Points: 73, Legacy Rep: 1362
    Location: Cocoa Beach, Florida

    Doug Lord Flight Ready

    Looks like it works. But without knowing the detail any further comment is probably useless speculation.It appears to me that the majority of weight is still on the forward foil though the rudder chord is larger than than the daggerboard chord. You can see the UFO foils here: http://www.sailingshot.com/2016/foiling-week-newport/september-8
    The very first I-14 on foils(1999) by David Lugg used a very small forward foil and large rudder foil.See bottom picture.
    I'm curious how easy the UFO is to foil since it is basically a bi-foiler, and how light a wind it will foil in ---and how it would compare with this:
    http://aeronamics.com/flo1/

    [​IMG]



    David Luggs I-14:


    [​IMG]
     

  15. Skyak
    Joined: Jul 2012
    Posts: 1,167
    Likes: 20, Points: 38, Legacy Rep: 152
    Location: United States

    Skyak Senior Member

    My interpretation is that the share of load on the T's of a bi-foiler does not make a huge difference and that the forward placement is a practical matter. The UFO can raise it's foils and sail to the dock -you can't do that with the dagger interfering with the sail. The other practicality is the wand mount directly on the T-foil for simplification. Foil forward is not better, but it's not much worse.

    As I have pointed out many times to armature designers -lead and balance are based on 3D forces on the boat. A keel boat sailing heeled is different from a dingy sailing flat, is different from a foiler sailing Veal heeled. The dagger should move forward as the mast moves to weather. Beyond that, small boats don't have force concerns with the tiller and may want an over sized rudder for low speed handling or agility. Moving the load to the dagger just enables wetted area minimization.
     
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.