From: DARUS47959@aol.com
Message-ID: <0.63320779.254b34da@aol.com>
Date: Fri, 29 Oct 1999 13:35:22 EDT
Subject: Lancair list email traffic on ZEHRBACH-LPE engines
To: harryleague@home.com
CC: lancair.list@olsusa.com
Mime-Version: 1.0

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Harry,
I was forwarded your e mail by some of my customers.  The statement which I 
make to customers as part of my Oshkosh forum presentation and as part of the 
brochures is slightly different from your statement while centering on the 8% 
number you quote.  I state that no customer has gotten less than an 8% fuel 
burn reduction.  Dick Perry got far better than that.  

I state that speed can be increased but it is something that requires action 
on the owners part.  As Dick Perry stated his speed is about the same.  
"About the same" is not the same as remains dead equal.  What happens is the 
engine runs far cooler and the expansion in the lower cowl half is far less 
which at the SAME air inlet and exit size causes a slight speed gain. 
Generally 2 to 3 knots.  I do not think Dick will disagree with that.  
However, I did state that we typically see 6 to 8 knots total gained IF the 
air outlet is closed down by closing the cowl flaps to take advantage of the 
lower operating temperatures.  Dick cannot do that as he has a fixed outlet 
and inlet as Dick stated.  Therefore, if you change your statement from 8% to 
8 knots and add the rest of the sentence about the outlet then you are 
correct.

As to questions about on our ability to deliver on time and at the fixed 
prices quoted  I suggest that you ask Dick Perry those questions as he can 
tell you that we came in on budget and on time along with saving him nearly 
$1,000 on his propeller.  

The coatings are a wonderful answer to the heat and wear problems of many 
engines.  The TSIO-550 is especially a benefactor.  On those engines we see 
13% fuel burn reductions with 50 degree oil temp reductions and 75 degree CHT 
reductions.  We run these engines as what we refer to as our "Medium Altitude 
Drone Engine" to 40,000 ft. in military applications.  There we have found 
that we can double the top end life over the currently (non ZEHRBACH coated) 
miserable TBO.

Dick Perry's installation prior to our modifications was not a very hot 
running installation.  His temperatures did not plummet so much.  We find 
that the hotter the installation is running the larger the drop in the 
temperatures.  Customer Mike Hillyer has two of my engines, a 360 and a 540 
in Velocity aircraft.  There the CHT fell from 460 to 400 degrees and the oil 
temp fell from 230 to 192.  Send me your physical address and I will send you 
a copy of Mikes testimonial.  He has had his aircraft with my engines in them 
on display at Sun in Fun and at Oshkosh.  Mike also reported zero blowby the 
same as Dick.  

Darus Zehrbach
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