<!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 6.00.2800.1400" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Prompted by Brian's excellent news regarding the
new stainless steel bearings available for the Webra 1.45/1.60 I thought I'd
share the following info on my Webra bearing life (standard non-stainless
steel). </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I keep a log of all flights including the
duration of each flight (rounded to the minute). Last week I went through the
arduous task of entering data on about 340 flights into MS Excel. I also keep a
log of each bearing change so I was able to compile data on bearing life on over
70 hours of flight time. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>All of my statistics below are reported in hours
because flights differ in duration. Also, the decimal points represent a
fraction of an hour, not minutes. For example 2.5 would be 2 1/2
hours. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I currently have three Webra engines, one in each
of my two planes and one backup (thanks to the RadioSouth $259 special). I also
had one Webra in which the bearings disintegrated and the engine was destroyed.
Horizon replaced this engine free of charge (thanks Horizon). I have broken out
bearing life times based on each engine. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Webra 1: </FONT></DIV>
<DIV><FONT face=Arial size=2>- Original Bearings: 12 hrs (may be off an hour or
so, first runs were not in current aircraft and not logged)</FONT></DIV>
<DIV><FONT face=Arial size=2>- Bearing 2: 13.22 hrs</FONT></DIV>
<DIV><FONT face=Arial size=2>- Bearing 3: 9.40 hrs</FONT></DIV>
<DIV><FONT face=Arial size=2>- Bearing 4: still in engine, 0.67 hrs</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Webra 2: </FONT></DIV>
<DIV><FONT face=Arial size=2>Original Bearings, 7.85 hrs (bearings disintegrated
and destroyed engine)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Webra 3: </FONT></DIV>
<DIV><FONT face=Arial size=2>Originals Bearings: 11.38 hrs</FONT></DIV>
<DIV><FONT face=Arial size=2>Bearing 2: still being used, 6.37 hrs</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Webra 4: </FONT></DIV>
<DIV><FONT face=Arial size=2>
<DIV><FONT face=Arial size=2>Originals Bearing 9.02 hrs </FONT></DIV>
<DIV>Bearing 2: still being used, 2.9 hrs.</DIV>
<DIV> </DIV>
<DIV>As you can see the times for replacement vary between 7.85 hrs and 13.22
hrs. If you take out Webra #2 that suffered the early bearing disintegration
then the range is consistently between 9 & 13 hrs. The average being 11
hrs.</DIV>
<DIV> </DIV>
<DIV>I found this quite interesting as it represents a fairly consistent pattern
of bearing life.</DIV>
<DIV> </DIV>
<DIV>I'd be interested to hear anyone else's results or
comments. </DIV>
<DIV> </DIV>
<DIV>Keith Black</DIV></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></BODY></HTML>