Message-Id: <5.0.2.1.2.20010504115953.03c4a5d0@olsusa.com>
Date: Fri, 04 May 2001 12:01:10 -0400
To: lancair.list@olsusa.com
From: Marvin Kaye <marvkaye@olsusa.com>
Subject: Re: transition: ROP to LOP
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Reply-To: lancair.list@olsusa.com

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Posted for "John Lasher" <johnlasher@msn.com>:


I always thought that Lancair pilots are like fishermen and have a tendency 
to overstate their aircraft's speed. I have to admit that I don't leave the 
airplane at 75% power very long after arriving at FL 240 before going to 
LOP. I may be underestimating by a few knots; 288-290 knots is probably the 
best I could hope for. I use the VM-1000 to set the power and a RMI 
uencoder TAS readout. I have no reason to suspect bad TAS readings based on 
GPS GS readouts.

Yes, based on the numbers I hear from Lancair pilots, I have a 
significantly slow airplane.

I don't have winglets or deicing boots.

I am the second owner of Walt Bills IV-P, N411WB. This was one of the early 
IV-P kits with a Dolly Parton cowl. The airframe workmanship is exceptional 
and got 5th place in Oshkosh in 1996. It has one of the best paint jobs I 
have seen on any Lancair IV. However, the avionics and power train needed 
work. The avionics have been upgraded to a beautiful panel with Garmin 530 
and 430s.

The engine is a TSIO-550B, which has some departures from original. It has 
an electronic ignition and a mag, new Ray-Jay turbos and intercoolers that 
probably came from the Malibu. Despite the differences, I expect that the 
engine is developing full rated power on TO and has no problem running at 
75% rated at FL 240.

This leaves the propeller, which probably is the reason that the aircraft 
doesn't fly as fast as most IV-Ps. The propeller is a McCauley 3 blade full 
feathering unit that I believe can be found on Cessna 414s. It seems to 
perform without problems, however, it was designed for a much slower 
aircraft, which might account for the 10-20 knots of extra airspeed that 
most IV-P drivers have over me.

What about IAS? At FL 240 I see about 202 KIAS at 75% power ROP.

Do you think the propeller is the problem? If so, what would you recommend?

John Lasher


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