<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2900.2722" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Today, while running an OS 1.60 with Master
Airscrew three-blade 16 x 10 on the ground, ONE blade departed cleanly at the
hub at near full power. The blade travelled approx. 45 yards, directly in
line with the prop disc-plane of the engine. There were no
injuries.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>This particular MA nylon prop had approximately 75
flights with the OS 1.60 on Aeroslave pipe setup. Ground peak rpm was in
the 85-8600 rpm range.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Based on other reports of three blade failures on
the OS 1.60, I won't encourage their use any longer. Two brands, several
different owners, different setups. Common elements - OS 1.60 on pipe and
three blade setup.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>This is just an FYI to those
interested.</FONT></DIV>
<DIV><FONT face=Arial size=2><BR>Bob Pastorello<BR><A
href="http://www.rcaerobats.net">www.rcaerobats.net</A><BR><A
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A></FONT></DIV></BODY></HTML>