Return-Path: Sender: (Marvin Kaye) To: lml Date: Fri, 15 Aug 2003 13:51:35 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m03.mx.aol.com ([64.12.136.6] verified) by logan.com (CommuniGate Pro SMTP 4.1.1) with ESMTP id 2523799 for lml@lancaironline.net; Fri, 15 Aug 2003 12:22:02 -0400 Received: from Billhogarty@aol.com by imo-m03.mx.aol.com (mail_out_v36_r1.1.) id 3.7d.3c47d3c0 (3980); Fri, 15 Aug 2003 12:21:57 -0400 (EDT) From: Billhogarty@aol.com X-Original-Message-ID: <7d.3c47d3c0.2c6e62a5@aol.com> X-Original-Date: Fri, 15 Aug 2003 12:21:57 EDT Subject: Re: [LML] Lancair IV Prop X-Original-To: GAMarr@Charter.Net, lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_7d.3c47d3c0.2c6e62a5_boundary" X-Mailer: 7.0 for Windows sub 10625 --part1_7d.3c47d3c0.2c6e62a5_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Giff: I have no experience with props. I know that as you add engine H.P., you should increase the blade diameter to utilize the extra power. The limiting factor then becomes ground clearance for the blade tips. The compromise is to add blades. I know that Don Goetz used the first 4-blade prop on his Lancair IV but I think that he wanted his machine to look different. I asked him if he could quantify the differences between 3 and 4 blades on the same engine but he suddenly found something else to do. The only differences between MT and Hartzell that I am aware of, is that the MT is a composite prop and requires a 400 hour overhaul instead of 500 for the Hartzell metal prop. I suspect that the MT might be a little cheaper, however I dont think that a 4-blade prop has ever been certified on the L-IV by the factory. This means that you would require a 40 hour test program instead of 25 hours. Regards, Bill Hogarty --part1_7d.3c47d3c0.2c6e62a5_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Giff:

I have no experience with props.   I know that as you add engine H= .P., you should increase the blade diameter to utilize the extra power. = ; The limiting factor then becomes ground clearance for the blade tips. = ; The compromise is to add blades.   I know that Don Goetz used th= e first 4-blade prop on his Lancair IV but I think that he wanted his machin= e to look different.  I asked him if he could quantify the differences=20= between 3 and 4 blades on the same engine but he  suddenly found someth= ing else to do.

The only differences between MT and Hartzell that I am aware of, is that the= MT is a composite prop and requires a 400 hour overhaul instead of 500 for=20= the Hartzell metal prop.  I suspect that the MT might be a little cheap= er, however I dont think that a 4-blade prop has ever been certified on the=20= L-IV by the factory.  This means that you would require a 40 hour test=20= program instead of 25 hours.

Regards, Bill Hogarty --part1_7d.3c47d3c0.2c6e62a5_boundary--