T2 Foiling Trimaran

Discussion in 'Multihulls' started by Doug Lord, May 29, 2019.

  1. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

  2. Doug Lord
    Joined: May 2009
    Posts: 16,580
    Likes: 298, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready

    Looks like he is using a version of the Bradfield wand based foil system*-dual, independent wands...... Any more specs?
    * provides most of the RM for the boat.....
    I really like the looks of this boat! The guy appears to have done a terrific job.
     
    Last edited: May 30, 2019
  3. Doug Lord
    Joined: May 2009
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    For what its worth:
    You might tell the guy that Bradfield main foils were set at +2.5 degrees( flap neutral) and the rudder t-foil at o degrees relative to the flight waterline which was designed to be parallel to the static waterline(after takeoff).
     
    Last edited: Jun 1, 2019
  4. Doug Lord
    Joined: May 2009
    Posts: 16,580
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    +2.5 degrees for the 2 main foils ( with the flap at neutral, 0 degrees for the rudder foil). Flap: 20 degrees up; 30 degrees down. If the foil area is correct and the wand is set for 30 degrees down for takeoff(all the way back) the boat should fly depending on weight, sa and wind. If it doesn't foil area may be too small......
    ---It wouldn't be a good idea to go more than +2.5 degrees because the ability of the windward foil to generate downforce would be compromised. In fact, some Bradfield boats used a system to move the windward foil to zero degrees upwind but that was just experimental and is NOT necessary.
    ---Some Bradfield boats had the facility to adjust a flap on the rudder T-foil but that had a minor benefit for racing and was NOT necessary on the standard boat using the Bradfield system.
     
  5. Doug Lord
    Joined: May 2009
    Posts: 16,580
    Likes: 298, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready

    Do you know the T2 weight(all up with skipper), mainfoil area, rudderfoil area and sail area? A well set up Rave was able to takeoff in about 7 knots wind speed with one person, an 18' Osprey about 6 knots wind with one person. Most standard Bradfield production boats seemed to need more wind.

    Dr. Sam considered this version of the Rave planing wand he invented to be the best-note the wedge shaped tip:
    Rave planing wand.jpg

    Osprey wand set up:
    pictures dl--
    OSPREY 9-16-11 non-sailing 002 - Copy.JPG

    The Osprey wand for this day one test was just a straight tube, but Dr.Sam preferred the Rave set up above:
    OSPREY 9-16-11 non-sailing 008.JPG
     
    Last edited: Jun 1, 2019
  6. Doug Lord
    Joined: May 2009
    Posts: 16,580
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    Location: Cocoa, Florida

    Doug Lord Flight Ready

    Thanks to Fred Monsonnec and Philippe De Braekelaer(designer/builder of T2) for this information:
    Here is the requested information :

    Overall lenght : 5.6 m
    Beam : 5.6 m

    Weight (without the skipper ! ;-) ) 120 kg

    Sail area : Mainsheet 17 m2, Jib 5 m2

    Amas T foils with flaps and wands (Bradford system), NACA 0012

    Rudder T foil adjustable NACA 0012

    Have a nice day !

    Philippe
     

  7. Doug Lord
    Joined: May 2009
    Posts: 16,580
    Likes: 298, Points: 93, Legacy Rep: 1362
    Location: Cocoa, Florida

    Doug Lord Flight Ready

    T2 foiling:

    T2-foiling.jpg
     
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