The SAE-1 and SAE-2 prop flange standards only really specify the Bolt Circle
Diameter as 4-3/8 for SAE-1 and 4-3/4 for SAE-2. The problem with that
standard is that there are still a ton of variables such as drive lug size (5/8
vs 3/4), drive lug depth, bolt size (3/8, 7/16, or 1/2), whether the flange has
drive lugs at all, the hub center size and depth, and the outer diameter size
of the flange. That's the reason why prop manufacturers will always ask you to
make all of those measurements when you order a prop.
The small Continentals up through O-200s all use SAE-1. Most of the Lycomings
use SAE-2, but have larger lug sizes in the bigger engines. The early model
Lycoming O-235 engines were SAE-2, while later models of the O-235 have two
sets of holes in the flange so can accommodate either SAE-1 or SAE-2 props by
moving the drive lugs.
Jeff Scott
Los Alamos, NM
---------- Original Message ----------
From: "erickelsheimer" <erickelshei...@att.net>
To: "KRnet" <kr...@mylist.net>
Subject: KR> Prop Flange
List-Post: krnet@list.krnet.org
Date: Fri, 10 Apr 2009 09:18:30 -0400
What's the big difference in the SAE 1 and SAE-2 Prop flanges is it
just the bolt pattern or is it the weight of the prop it will handle or both
etc. I know most are using a SAE-1 Prop flange but I can get either one or
both. Does prop size come into the mix or the number of blades or all the
above? Thank's for the reply guys :)
Eric Von Kelsheimer
1-765-832-8049
KC9OUH
Clinton, In. 47842
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