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Old 08-04-2005 | 09:19 AM
  #44  
spbyrum
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From: Cullman, AL
Default RE: Senior Pattern Association Discussion
Gentlemen

DynaThrust is a muffler. Gain using them can be as much as 1500 rpm. We've had guys experiment with them on YS61s but couldn't get them to idle reliably. On a modern 61, that might be the ticket.

11x9 four blade might also be a solution. Not loud, but they sure pull on the 4s. Rs are about 10,800 on the ground on the 4s.

93 db at 25 feet is the IMAC standard and not hard to meet.
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