Return-Path: Received: from imo15.mx.aol.com ([152.163.225.5]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Wed, 23 Feb 2000 11:36:27 -0500 Received: from Sky2high@aol.com by imo15.mx.aol.com (mail_out_v25.3.) id k.f.163f313 (3925) for ; Wed, 23 Feb 2000 11:41:46 -0500 (EST) From: Sky2high@aol.com Message-ID: Date: Wed, 23 Feb 2000 11:41:45 EST Subject: RAM Air (Again...) To: lancair.list@olsusa.com X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Rick, et al; The theoretical rise from ram air at our speeds (190 kts, a rise in itself) is about 1.5 inches. I see this difference by measuring and computing the ambient air pressure and the reading on my EPI 800 manifold pressure instrument. I use a straight, smooth walled opening (little or no leakage, parts connected with a rubber plumbing sleeve) directly to the front mounted servo inlet. There is no filtered or alternate air, therefore I have no comparison numbers. I expect my cylinders will reach their demise long before TBO. However, our compatriot wild and crazy builder Tom Giddings has fitted a ram air pressure plenum with a large K&N filter and feeds his servo with high-pressure low-speed air and sees about the same rise. Perhaps he will comment on his installation. Scott Krueger N92EX >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 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. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>