Open Water Video

This is an open water propeller test. We are using an exact scale replica of an FFG 7 propeller (hence the $50k price tag), which when coupled to the ship model can give us SHP and maneuvering characteristics. But before you can do that you must determine propeller efficiency unhindered by a ship hull. This is done by attaching the propeller to the front of a dynamometer and towing the propeller at different speeds. The propeller rotations per second (rps) are held constant at a high rate to get the highest Reynolds number for the incoming water. This will minimize drag and maximize lift to the foil (blade)

Category:

Science & Technology

Tags:

• propeller
• open
• water
• naval
• architecture
• ffg 7

[TheCoolmaster100]

I thought the propeller would have spun clockwise because the blades look like that they are ment to spin that way because of the pointed tip of the blades not the rounded edges on the anit clockwise rotation. Also the propeller looks like it would have more pitch to push the water that way.

[froudedude]

the curved edges are the lead edge. In this kind of test the propeller is in a "tractor" set up. The tips are the outermost trailing edge.

[froudedude]

380 ft long 16 ft deep and 27 ft wide

[TheCoolmaster100]

Okay.

[DesiScientist]

thanks for sharing !........well made video. Quite informative; keep it up

[simpleAtoZ]

Thanks for the upload and may i know how long is the towing tank?