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Woodsy · 02-08-2006, 10:17 AM

Fat Jack...

Unfortunately you are wrong again...Rep. Whalley's bill actually lowers overall noise output, it certainly does not increase it by a factor of four! I don't think there is anyone on the lake that would vote for an increase in noise!

What you forgot to add in your equation is that the current test is done at 50 feet on a moving boat. At 50 feet, given outside ambient background noise, a boat can can exhibit up to 9.9 db less noise than if it is measured at 4 feet as suggested by Rep. Whalley.

Also, the limits suggested by Whalley are the nationally accepted levels that are currently in place by all boat manufacturers. So in effect, it measures and confirms stock noise levels!

Once again you have ventured in to an area you have very little understanding of....

Anyway, here is some background info on noise:

The Society of Automotive Engineers (SAE) developed three methods of measuring watercraft sound, including that of PWC:

SAE J34: The most precise measurement available, taken of a boat at a distance of 50ft with wide-open throttle (the near maximum noise of the boat). Although great for engineering standards, it is difficult for enforcement purposes in the field. The Coast Guard recommends 86 decibels (dBA), which most states have adopted as law.

SAE J2005: This measures the engine sound at idle with the microphone 1.5 m away. SAE recommends a limit of 90dbA for this method, which does not account for the speed or power of the boat.

SAE J1970 In realizing the enforcement difficulties of the previous methods, SAE designed this shoreline noise test enabling regulations keeping the boat under 75 dBA at 50 ft. by operation, not mechanics. The operator is responsible for controlling the noise of the boat.

Sound energy dissipates with distance, other sound and wind. A comprehensive study on sound with motorboats (but not including PWC) found that sound dissipates up to 9.9dBA when the boat travels from 50 ft to 200 ft away (4.8 dBA reduction from 50 to 100 ft, additional 5.1 dBA reduction from 100 to 200 ft.).

Both the National Association of State Boating Law Administrators (NASBLA) and the National Marine Manufacturers Association (NMMA) have Model Noise Acts, which our manufacturers follow as NMMA members. These requirements are in compliance with the SAE recommended dBA standards. NASBLA requires 88 dBA under SAE J2005, and 75 dBA under SAE J1970. NMMA recommends 90 dBA under SAE J2005. The Environmental Protection Agency has determined that 75 dBA at 50 feet is an acceptable noise level to protect public health and welfare.

Woodsy

The only way to eliminate ignorant behavior is through education. You can't fix stupid.

02-08-2006, 10:17 AM	#4
Woodsy Senior Member Join Date: May 2004 Location: Weirs Beach Posts: 1,968 Thanks: 80 Thanked 980 Times in 440 Posts	Fat Jack... Unfortunately you are wrong again...Rep. Whalley's bill actually lowers overall noise output, it certainly does not increase it by a factor of four! I don't think there is anyone on the lake that would vote for an increase in noise! What you forgot to add in your equation is that the current test is done at 50 feet on a moving boat. At 50 feet, given outside ambient background noise, a boat can can exhibit up to 9.9 db less noise than if it is measured at 4 feet as suggested by Rep. Whalley. Also, the limits suggested by Whalley are the nationally accepted levels that are currently in place by all boat manufacturers. So in effect, it measures and confirms stock noise levels! Once again you have ventured in to an area you have very little understanding of.... Anyway, here is some background info on noise: The Society of Automotive Engineers (SAE) developed three methods of measuring watercraft sound, including that of PWC: SAE J34: The most precise measurement available, taken of a boat at a distance of 50ft with wide-open throttle (the near maximum noise of the boat). Although great for engineering standards, it is difficult for enforcement purposes in the field. The Coast Guard recommends 86 decibels (dBA), which most states have adopted as law. SAE J2005: This measures the engine sound at idle with the microphone 1.5 m away. SAE recommends a limit of 90dbA for this method, which does not account for the speed or power of the boat. SAE J1970 In realizing the enforcement difficulties of the previous methods, SAE designed this shoreline noise test enabling regulations keeping the boat under 75 dBA at 50 ft. by operation, not mechanics. The operator is responsible for controlling the noise of the boat. Sound energy dissipates with distance, other sound and wind. A comprehensive study on sound with motorboats (but not including PWC) found that sound dissipates up to 9.9dBA when the boat travels from 50 ft to 200 ft away (4.8 dBA reduction from 50 to 100 ft, additional 5.1 dBA reduction from 100 to 200 ft.). Both the National Association of State Boating Law Administrators (NASBLA) and the National Marine Manufacturers Association (NMMA) have Model Noise Acts, which our manufacturers follow as NMMA members. These requirements are in compliance with the SAE recommended dBA standards. NASBLA requires 88 dBA under SAE J2005, and 75 dBA under SAE J1970. NMMA recommends 90 dBA under SAE J2005. The Environmental Protection Agency has determined that 75 dBA at 50 feet is an acceptable noise level to protect public health and welfare. Woodsy The only way to eliminate ignorant behavior is through education. You can't fix stupid.