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Speed detecting system for marine propulsion unit

  • US 5,295,877 A
  • Filed: 11/30/1992
  • Issued: 03/22/1994
  • Est. Priority Date: 12/05/1991
  • Status: Expired due to Term
First Claim
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1. A pressure sensitive speed indicator for a watercraft, said speed indicator including a conversion unit adapted to convert a fluid pressure into a speed signal, said conversion unit having a pressure inlet port, a water pressure sensing port positioned to receive dynamic water pressure as said watercraft travels through a body of water, and conduit means for interconnecting said pressure sensing port to said pressure inlet port for transmitting a fluid pressure signal thereto, said conduit means having a low portion connected at its outlet end to said pressure inlet port and a first high portion higher than the lowest part of said lowest portion and said water pressure sensing port, said conduit means having a volume between said pressure sensing port and said first high portion of volume sufficient that at the highest expected watercraft speed, the fluid pressure at said pressure sensing port will not cause water to flow past said first high part in said conduit means into said lower portion.

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