Talaria IV - Submerged Foil Hydrofoil
Harry Larsen
· K. Matveev Lift Formula in Excel
Flying - History Channel
photographer filming the front foil
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Over the bow in a turn
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The wake in a turn
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The wake
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From the helm
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View over bow, foil 2' under water,
notice small limb broken around front strut
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Bow Strut, Foil and Pod
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In hoist, struts retracted, ready
for trailer
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Bow strut, retracted
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Stern strut, retracted
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Flying - Sharp Turn
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On the Hull
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Feedback on:
- Web site
- Talaria IV Design / Performance / Economics
Most appreciated. htdr.larsen@verizon.net
The Talaria IV flight experience of Elliot S.James, PHM owner:
Vehicle Description
Boat:
- 24 foot (nominal) deep V hull
- 200 hp Volvo outdrive powered
- Canard configuration
- Boat weight 5140 lbs.
- Foil spans within the boat's beam (8')
- Hydraulic retraction of bow and stern foils (trailerable)
- Manual hydraulic bow strut steering
- Rear foil loading 462 lbs/sq ft
- Bow foil loading 541 lbs/sq ft
Hydrofoil Materials;
- Bow strut - stainless steel
- Aft center strut - galvanized steel
- Bow foil and side struts - high density FRP
- Aft foil - aluminum
Hydrofoil Control system;
- Height - Surface ski articulating bow foil angle of attack
- Roll - Differentially actuated flaps on rear foil controlled by analog
computer
- Hydraulic system: servo valve, 4 way valves, pump, heat exchanger, filter,
stainless steel cylinders
Computers:
- Analog computer flight controller (speed variable gains)
- Pentium lap top powering instrument display and DAQ
Data acquisition:
- 8 channel 12 bit 50 samples per second PC based data acquisition system
Performance;
- 25 knots at 3000 RPM
- 30 knots at 3500 RPM
- 34 knots at 4000 RPM
- Take off speed about 18 knots
- Have negotiated 3' steep / short waves
