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10 minute refresh The Davidson Boat Propeller
Title: The Davidson Boat Propeller Description: The Davidson Boat Propeller, http://www.nzinvent.com, has been tested on a 250w motor driving a 15 inch ducted fan and delivering 2500 C.F.M. at 0.45ins. w.g.
Tested on a 30 foot fishing trawler with a single cylinder� slow revving engine and a measured 4.5 hp at the tail shift. The propeller enabled this trawler to tow a 45 foot trawl net at about 4 knots and catch the same amount� type and size of fish to a similar sized boat and net with a four cylinder Ford engine rated at 66 B.H.P. Both craft had the same top speed when trawling (the test was carried out over a 4 hour period 12 miles off shore with a moderate Pacific swell).
An experienced diver was placed about 20 foot under the test site. He reported that there was no noise from the Davidson Boat Propeller until it was directly overhead when a faint whistling noise was heard.
The propeller was tested on a single seater 25hp Hydra Sonic speedboat. The standard racing propeller was simply taken off and the Davidson Boat Propeller slipped on.
The standard propeller had an output velocity of 15 m/s @3000RPM and the Davidson Propeller had an output velocity of 20m/s @3000RPM. Same boat� same driver and the same motor. Author:nzinvent Tags: boat, ducted, fan, invention, new, propeller, ship, speed, technology, test, velocity Duration: 219 seconds View count: 7171 Rating: 2.80 (5 ratings) Flash:http://www.youtube.com/v/-VfyAsofkk8&f=gdata_videos Watch page:http://www.youtube.com/watch?v=-VfyAsofkk8
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