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Systems Integration: V Foils and
A-Frame Sails for the RAVE V
Presented by Larry Knauer, Lead Designer, WindRider International
July 2, 2015 Lake Garda, Italy
© 2015 WindRider International
Base Design by Clayton Bader & Larry Knauer
Foil design by Thomas Cusumano II
Stability and Structures by Jacob Simon
Production engineering Zachary Frederick
Production Technician Justin Ryan
Contributors
© 2015 WindRider International
Then & Now
Original Rave 1998
42 knot Demonstrated
Rave V coming soon
Design speed 35 plus knots
http://www.windrider.com
© 2015 WindRider International
1/6 Scale Model
© 2015 WindRider International
Drawings By Clayton Bader
V Foils
• Generate lift proportional to
submergence in the water
• Lifting load shared by ama
and waka thus eliminating
high bending loads on aka
• Easy dock clearance
© 2015 WindRider International
Retractable Foils
Foils are retractable to facilitate
easy launching from a beach and
simplify trailering
© 2015 WindRider International
V Foils
Tapered Section
• Large cords at top to enable
early takeoff at around 7
knots
– 70% of the lift at low speed
is from the V foil, 30% from
Lifting tube
• Cord tapers down and pitch
diminishes on lower foils to
reduce lift and resistance at
high speeds
– Less than 20% of the lift is
from the V foil, 80% from
lifting tube
Lower Foil© 2015 WindRider International
Whole V Foil Models
© 2015 WindRider International
V Foils
Foils tipped with sonic
lifting tubes:
• For efficient lift
production, 25% lower
drag than equivalent T
foil
• To reduce tip vortices on
V foils
• To reduce cavitation at V
apex
© 2015 WindRider International
Rudder foil
• Rudder foil pitch
and lift controlled
by pitch of boat
around the
forward foils
• Lower loads on
rear foil
• V foil shape not
needed
© 2015 WindRider International
Full Length
Rudder Foil
Models
• Sonic lifting tube is
25% lower drag then
the equivalent T foil
• Sonic lifting tube
provides higher
lateral rudder forces
– Improved rudder
efficiency in shallow
water
© 2015 WindRider International
Drawing by Jacob Simon and Clayton Bader
• Helps to generate a
righting moment
• Reduces the wing
tip vortices from
the sails
• Utilizes strength of
triangles
eliminating side
stays
A Frame Rig
© 2015 WindRider International
Why An A Frame
© 2015 WindRider International
© 2015 WindRider International
High Speed Loads Diagram
© 2015 WindRider International
Low Speed Loads Diagram
© 2015 WindRider International
Handicap Accessibility
Similar to WindRider model
WR17-AS (at right), RAVE V
will also be handicap
accessible with the options for
custom foot and/or hand
controls. Hiking will not be
required.
The total force needed to
control the boat is just 20 lbs
or less for the handicap set up,
and redundant controls go to
each seat.
© 2015 WindRider International
Other Nice Features
• Retractable pontoons will make trailering and
launching the boat from a ramp easier
• It carries 2 people weighing a total of 400 lbs, with a
max boat weight of 700 lbs (300 lb boats empty
weight)
• May utilize ballast tanks to compensate for changes in
crew weight
• The rudder is controlled by foot pedals leaving your
hands free to handle both sheets
• Sheets can move together or can be adjusted
individually for trimming the forces
• Price will be less than any comparable foiling boats
© 2015 WindRider International
Conclusions
• Integrated systems solution of V foil with sonic
lifting tube along with A frame sail rig:
– Low structural weight
– Higher sail forces
– Self trimming for speed
– User and handicap friendly
– Simplified beaching and trailering
– Low initial foiling speed
– Reduced drag at high speed
© 2015 WindRider International

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Rave v presentation for foiling week (final) (1)

  • 1. Systems Integration: V Foils and A-Frame Sails for the RAVE V Presented by Larry Knauer, Lead Designer, WindRider International July 2, 2015 Lake Garda, Italy © 2015 WindRider International
  • 2. Base Design by Clayton Bader & Larry Knauer Foil design by Thomas Cusumano II Stability and Structures by Jacob Simon Production engineering Zachary Frederick Production Technician Justin Ryan Contributors © 2015 WindRider International
  • 3. Then & Now Original Rave 1998 42 knot Demonstrated Rave V coming soon Design speed 35 plus knots http://www.windrider.com © 2015 WindRider International
  • 4. 1/6 Scale Model © 2015 WindRider International
  • 5. Drawings By Clayton Bader V Foils • Generate lift proportional to submergence in the water • Lifting load shared by ama and waka thus eliminating high bending loads on aka • Easy dock clearance © 2015 WindRider International
  • 6. Retractable Foils Foils are retractable to facilitate easy launching from a beach and simplify trailering © 2015 WindRider International
  • 7. V Foils Tapered Section • Large cords at top to enable early takeoff at around 7 knots – 70% of the lift at low speed is from the V foil, 30% from Lifting tube • Cord tapers down and pitch diminishes on lower foils to reduce lift and resistance at high speeds – Less than 20% of the lift is from the V foil, 80% from lifting tube Lower Foil© 2015 WindRider International
  • 8. Whole V Foil Models © 2015 WindRider International
  • 9. V Foils Foils tipped with sonic lifting tubes: • For efficient lift production, 25% lower drag than equivalent T foil • To reduce tip vortices on V foils • To reduce cavitation at V apex © 2015 WindRider International
  • 10. Rudder foil • Rudder foil pitch and lift controlled by pitch of boat around the forward foils • Lower loads on rear foil • V foil shape not needed © 2015 WindRider International
  • 11. Full Length Rudder Foil Models • Sonic lifting tube is 25% lower drag then the equivalent T foil • Sonic lifting tube provides higher lateral rudder forces – Improved rudder efficiency in shallow water © 2015 WindRider International
  • 12. Drawing by Jacob Simon and Clayton Bader • Helps to generate a righting moment • Reduces the wing tip vortices from the sails • Utilizes strength of triangles eliminating side stays A Frame Rig © 2015 WindRider International
  • 13. Why An A Frame © 2015 WindRider International
  • 14. © 2015 WindRider International
  • 15. High Speed Loads Diagram © 2015 WindRider International
  • 16. Low Speed Loads Diagram © 2015 WindRider International
  • 17. Handicap Accessibility Similar to WindRider model WR17-AS (at right), RAVE V will also be handicap accessible with the options for custom foot and/or hand controls. Hiking will not be required. The total force needed to control the boat is just 20 lbs or less for the handicap set up, and redundant controls go to each seat. © 2015 WindRider International
  • 18. Other Nice Features • Retractable pontoons will make trailering and launching the boat from a ramp easier • It carries 2 people weighing a total of 400 lbs, with a max boat weight of 700 lbs (300 lb boats empty weight) • May utilize ballast tanks to compensate for changes in crew weight • The rudder is controlled by foot pedals leaving your hands free to handle both sheets • Sheets can move together or can be adjusted individually for trimming the forces • Price will be less than any comparable foiling boats © 2015 WindRider International
  • 19. Conclusions • Integrated systems solution of V foil with sonic lifting tube along with A frame sail rig: – Low structural weight – Higher sail forces – Self trimming for speed – User and handicap friendly – Simplified beaching and trailering – Low initial foiling speed – Reduced drag at high speed © 2015 WindRider International

Editor's Notes

  1. Hi my name is Larry Knauar. I am Rave V project Lead. I will be presenting on the Rave V, the goals we have for this design, the materials, and the unique construction technique we are using for this design.
  2. Hi my name is Larry Knauar. I am Rave V project Lead. I will be presenting on the Rave V, the goals we have for this design, the materials, and the unique construction technique we are using for this design.
  3. The original rave seen on the left was built in the 1990s and was well ahead of its time. It used T foils with surface feelers to make rapid changes to the T foils trim so that it could stay level. It used hand controls for the sails and foot controls for the rudder. It weighed 400 lbs, carried up to 2 people, and its record speed was 42 knots. The new Rave V for which the prototype is currently under construction will push the envelope a little further but in a new direction. This foiling boat will still be fast but the primary objective is to make foiling simple. It will takeoff at lower speeds, be easy to set up and transport, will be handicap accessible, and like its predecessor will not require the occupant to move their weight around as ballast.
  4. One of the Main features of the new design will be the use of V foils. Hence the name Rave V. As a surface piercing foil they will provide lift inversely proportional to their submergence in the water. This happens because as they rise out of the water there is less foil in the water to generate lift. T foils always have the entire lift generating part of the foil in the water and therefore need to use rapidly trim adjustments to keep the boat level. The V design eliminates the need for moving parts like surface feelers and trimable foils to keep the boat level. It also has some structural advantages in that the loads from the foils are split between the main hull and the pontoons which reduces the size of the members needed to attach the pontoons to the main hull. To reduce setup time for the Rave V and allow for beaching, foils will be hinged at the attachment to the pontoons and a retractable pin on the center hull will allow the passenger to lower or raise the V foils. The rudder foils can also be raised as shown in the drawings.
  5. The shape of each foil will also play a key roll in allowing the Rave V to begin foiling at speeds as low as 8 Knots. Note that the tops of the foils are very wide as seen from the side view and that width diminishes as you look further down the foil. The width at the top of the foils is an entire foot and allows for the very high lift generation needed to start foiling at just 8 knots. Since all that lift will not be needed once the boat is traveling fast out of the water the width and pitch of the foils is reduced at the lower foil sections to reduce the drag and prevent the foils from leaving the free surface causing lift generation to stops and the boat to crashes back down into the water.
  6. Another unique feature on these foils will be the use of sonic tubes. These annular sonic foils are expected to produce a lot of lift for their size and with very little drag when compared to conventional foils. We expect that at high speeds around 70% of the lift will be produced by these small circular foils while at low speeds about 35% will be produced by them. This change in lift percentage will be due to the amount of the straight foils in the water at the given speed. An added bonus of having the tubes on the end of the foils is that they act as winglets and reduce the wing tip vortices. This is the first time super sonic foil shapes have been used on surface piercing foils. Since water is a very dense fluid, we expect that the supersonic foil shapes will perform better than traditional NACA series foil shapes at the speeds that this boat will travel.
  7. For the rear foils just a sonic tube on a straight foil section is used. This is because the rear foils are self trimming so long as they have the ability to rotate about the forward foils when they sink of rise out of the water. If the foil sinks its angle of incidence with the oncoming flow increases and more lift is generated until equilibrium is reached. The additional lift of a V foil is not desired here since the loads on the rear foil are expected to be small.
  8. Another unusual and prominent feature of the Rave V is it’s A frame rig. This has three advantages. For one, since wind forces act about normal to the sails there will be a righting moment due to the inward slope of the sails as shown in the picture. The triangular mast shape is also very robust structurally meaning that it can be built lighter then two independent masts. The curved part at the top of the mast also does a lot to reduce the wing tip vorticities on the top of the sail which makes for more efficient sails.
  9. Another feature not so evident from the drawings is that this boat will have the option of custom controls for handicap persons. The boat can be made to work for people with no use of either their hands or feet through the use of custom hand or feet controls. I have seen a young boy paralyzed except for some use of his hands pilot the Windrider 17 with the handicap set up. This is due to the fact that the controls require no more than 20 lbs of force to operate.
  10. Other nice features include the use of retractable pontoons to allow for easy launching and trailering. The polls which connect the pontoons to the hull are telescoping so it is not necessary to remove parts from the boat to fold it up. It can carry one or two people weighing up to a total of 400 lbs and will utilize ballast tanks to ensure stability while foiling, even with large changes in crew weight. The rudder will be controlled by foot pedals much like in the original rave freeing the skippers hands to work the lines. The cost of the boat is $29,500 which is less then other foiling boats this size.