From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: Hot Desert, Ice, Hot Cylinders 
To: lml
Date: Thu, 24 Jul 2003 13:52:01 -0400
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Posted for JIMRHER@aol.com:


Thanks Larry, I appreciate your report.

I have had others who asked about the Alt Air door. I do have a manual 
control and a Light operated by a micro switch on the door and it was closed. 
I 
didn't notice that my inlet air temp was anything other than normal and the 
K&N 
filter is mounted so that only about 1/3 of it is exposed to the ram air. I 
don't think that I had any major blockage at the filter and my door was 
closed. 
Also, my engine temps came right back to normal after descending below the 
freezing level, where I pushed the power back up to hi cruise to see if 
everything 
was normal, and it was.

That is why I think is was cooling air INLET icing but don't really know.

My IAS was down to 140 KIAS at one point and I wonder what the STALL speed is 
with 1/8 or 1/4 in. of ICE and FL 250 +-? That would be a scary ride if it 
stalled up there.

I had other reports that it could have been Density Altitude, which I didn't 
look at, but over the desert this time of year it could have been higher than 
my altitude. I did have 2/4*F OAT at FL 230. Must look that up.

Make sure you have a HOT inlet on your turbine engine and make provisions for 
the Ice to not go into the turbine blades. The PT6 has an Ice door in the s 
bend of the air intake, does the Walter? Also you will be having a higher wing 
loading and higher altitudes but then you have the MACH heating to do most of 
your deicing.

Thanks and good luck,