Sail GP-a new Grand Prix Foiling Cat Racing League

Discussion in 'Multihulls' started by Doug Lord, Oct 2, 2018.

  1. Doug Lord
    Joined: May 2009
    Posts: 15,665
    Likes: 220, Points: 73, Legacy Rep: 1362
    Location: Melbourne, Florida

    Doug Lord Flight Ready

  2. Doug Lord
    Joined: May 2009
    Posts: 15,665
    Likes: 220, Points: 73, Legacy Rep: 1362
    Location: Melbourne, Florida

    Doug Lord Flight Ready

    More F50 design detail: F50s upgrades preview over AC50s | Catamaran Racing, News & Design https://www.catsailingnews.com/2018/10/f50s-upgrades-preview-over-ac50s.html

    Excerpt:

    These boats have been redesigned, re-engineered and rebuilt from the inside out.

    Supercharged
    Take, for example, flight control. This is the command and control system so vital to maintaining stable flight to keep the boat sailing at pace. And here the F50 designers have really gone to work.

    For the F50 both the foil and rudder pitch will be actively controlled. This should make the flight of the boat through the manoeuvres significantly more efficient.

    The foils have been produced in higher modulus carbon fibre, producing a thinner section which has less resistance at high boat speeds. The geometry of the boards has been extended outside the maximum beam of the boat which provides more righting moment and a smoother transition between the vertical and horizontal sections of the foil. All of this translates into significantly higher ultimate boat speeds, where the onset of cavitation on the board occurs at a much higher speed as compared to a foil designed under the AC50 class rule.

    Batteries have been brought in and are connected to a new hydraulic accumulator to power the foil and rudder pitch control, the jib sheet, and the wing twist control freeing up the two grinders to work on providing power to the wing sheet.

    The flight of the boat can be controlled from the twist grips on the steering wheel or from a joystick controlled by the crew member sitting in position 3 (flight controller). The ride height of the boat can be adjusted independent of the fore and aft bow down pitch.

    What seems like miles of hydraulic lines stitched inside the hulls and under the floorboards are used to distribute power to cant the boards to the most efficient angle and activate the rudder pitch control system.

    The helmsman can control the ride height, the jib sheet, and the rudder differential from push buttons on the steering wheel. The helmsman can also adjust the speed at which those functions are adjusted by adjusting a dial in the centre of the steering wheel. Teamwork and communication will be key to achieving speed and efficiency.

    Top speeds are expected to be 53 knots when the boat is reaching in 20 knots of wind speed. The onset of cavitation is predicted to occur at approximately 48 knots of boat speed – a process where high speed causes the water to bubble near the foil, reducing lift and ultimately limiting the ability to fly the boat efficiently once the cavitation becomes excessive.

    With battery power on board the teams will have more freedom to tack or gybe more frequently. Skippers and tacticians won’t find themselves waiting for grinders to build power in the system before they can call for the next maneuver.

    The F50s will sail with just five crew, the batteries freeing up one grinding position on board. This has led to a complete redesign of the cockpit layout.

    Six F50s will be on the water for the first event in Sydney, Australia in February 2019. Three have been extensively modified using parts from parts of the previous AC50 models. Three sets of the F50s hulls are complete new builds. All of the work was done at Core Builders Composites in New Zealand.

    F50blueprint.png


     
  3. Doug Lord
    Joined: May 2009
    Posts: 15,665
    Likes: 220, Points: 73, Legacy Rep: 1362
    Location: Melbourne, Florida

    Doug Lord Flight Ready

  4. Doug Lord
    Joined: May 2009
    Posts: 15,665
    Likes: 220, Points: 73, Legacy Rep: 1362
    Location: Melbourne, Florida

    Doug Lord Flight Ready

  5. Doug Lord
    Joined: May 2009
    Posts: 15,665
    Likes: 220, Points: 73, Legacy Rep: 1362
    Location: Melbourne, Florida

    Doug Lord Flight Ready

    First F50 flys:
     
  6. Doug Lord
    Joined: May 2009
    Posts: 15,665
    Likes: 220, Points: 73, Legacy Rep: 1362
    Location: Melbourne, Florida

    Doug Lord Flight Ready


  7. Doug Lord
    Joined: May 2009
    Posts: 15,665
    Likes: 220, Points: 73, Legacy Rep: 1362
    Location: Melbourne, Florida

    Doug Lord Flight Ready

     
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.