<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
         <<  Lancair Builders' Mail List  >>
         <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>

Hear me out here!

As reported previously, my Lancair 320 has the EAR/Lancair recommended soundproofing material installed on the aft firewall, floor and sides (back to the seatback) and in the interior leading edge of the stubwing (acts like a soundbox).  I have carpeting, foam-backed fabric and temperfoam seats covered with sheepskin.  I also have the older canopy 1/8 inch thick material.  The following comparisons were made at the head with a sound level measuring device set to the "C" scale (broad range, slow reaction):

Db......Condition
90       Astro Van @ 70 mph
92       96 Corvette @ 75 mph, smooth road
95       85 Corvette @ 70 mph, smooth road
104     Lancair 320 at 25sq, 3000 ft, smooth air
106     Skymaster (C337) 24sq, 3000 ft, props synced, smooth air in the front.

Note, although I could hear a change in the noise content when I opened the air vents in the Lancair (rushing sound), there was no difference in the sound level.

I do wear Bose headsets.

NOTE:  Anybody within reasonable flying distance of Chicago can borrow the sound meter for comparison purposes.  If you are close enough, I can fly to you or meet for lunch halfway. (300 NM radius of KARR).

Scott Krueger
N92EX
Cell phone- 630-561-0400

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.