Foiling Week™ 2015. July 2nd - Presentation by Larry Knauer: "The Rave V Windrider, a trailerable...
-
Upload
foiling-week -
Category
Design
-
view
77 -
download
2
Transcript of Foiling Week™ 2015. July 2nd - Presentation by Larry Knauer: "The Rave V Windrider, a trailerable...
Systems Integration: V Foils andA-Frame Sails for the RAVE V
Presented by Larry Knauer, Lead Designer, WindRider InternationalJuly 2, 2015 Lake Garda, Italy
Base Design by Clayton Bader & Larry KnauerFoil design by Thomas Cusumano II
Stability and Structures by Jacob SimonProduction engineering Zachary Frederick
Production Technician Justin Ryan
Contributors
Then & Now
Original Rave 199842 knot Demonstrated
Rave V coming soonDesign speed 35 plus knots
http://www.windrider.com
Drawings By Clayton Bader
V Foils• Generate lift proportional to
submergence in the water• Lifting load shared by ama
and waka thus eliminatinghigh bending loads on aka
• Easy dock clearance
Retractable Foils
Foils are retractable to facilitateeasy launching from a beach andsimplify trailering
V FoilsTapered Section• Large cords at top to enable
early takeoff at around 7knots– 70% of the lift at low speed
is from the V foil, 30% fromLifting tube
• Cord tapers down and pitchdiminishes on lower foils toreduce lift and resistance athigh speeds– Less than 20% of the lift is
from the V foil, 80% fromlifting tube
Lower Foil
V FoilsFoils tipped with soniclifting tubes:• For efficient lift
production, 25% lowerdrag than equivalent Tfoil
• To reduce tip vortices onV foils
• To reduce cavitation at Vapex
Rudder foil• Rudder foil pitch
and lift controlledby pitch of boataround theforward foils
• Lower loads onrear foil
• V foil shape notneeded
Full LengthRudder Foil
Models• Sonic lifting tube is
25% lower drag thenthe equivalent T foil
• Sonic lifting tubeprovides higherlateral rudder forces– Improved rudder
efficiency in shallowwater
Drawing by Jacob Simon and Clayton Bader
• Helps to generate arighting moment
• Reduces the wingtip vortices fromthe sails
• Utilizes strength oftriangleseliminating sidestays
A Frame Rig
Handicap Accessibility
Similar to WindRider modelWR17-AS (at right), RAVE Vwill also be handicapaccessible with the options forcustom foot and/or handcontrols. Hiking will not berequired.The total force needed tocontrol the boat is just 20 lbsor less for the handicap set up,and redundant controls go toeach seat.
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 emptyweight)
• May utilize ballast tanks to compensate for changes increw weight
• The rudder is controlled by foot pedals leaving yourhands free to handle both sheets
• Sheets can move together or can be adjustedindividually for trimming the forces
• Price will be less than any comparable foiling boats