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  #21  
Old 01-20-2014, 12:16 PM
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fl-mike fl-mike is offline
 
Join Date: Jul 2005
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Quote:
Originally Posted by spaceflightmeow View Post
Holy cow, FL-mike, you win the thread. Excellent data. What is the significance of most of the energy being at the prop frequency? My guess is that it prop noise would be acoustic noise, penetrating through the drum-head firewall and also beating down on the canopy.
The blade pulses on the windscreen and exhaust pulses on the floorboards?
I think each cylinder fires every 180 degrees, so that is the same as a two blade prop blade frequency. 2*2700/60
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RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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  #22  
Old 02-02-2014, 10:41 AM
Vansrv7arob Vansrv7arob is offline
 
Join Date: Dec 2010
Location: Coal Point, Australia
Posts: 128
Default muffled exhaust

Just put my order in for a muffled exhaust from vetterman, larry said it will reduce noise by approx 6db wbat else was interesting was when they dyno the new 1.5 vs 1.75" crossover system the 1.5 came out in front in hp accross the range? Huh...anyway i'll give it a go.

I like the data just makes arguments so much simpler....
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