Message-ID: <009b01c1af5d$934868a0$406eaccf@oemcomputer>
From: "Bill & Sue" <harrelson@erols.com>
To: <lancair.list@olsusa.com>
Cc: <edechazal@home.com>
References: <20020205050932.AAA11067@pop3.olsusa.com>
Subject: LNC2 high altitude performance  -  320
Date: Wed, 6 Feb 2002 17:28:16 -0500
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Reply-To: lancair.list@olsusa.com

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Here's a follow up on Ed de Chazal's high altitude report.  Today I hooked
up the new oxygen system and did some preliminary tests up to FL210.  I
agree with Ed that the Mountain High EDS system is great  It automatically
adjusts the oxygen pulse as you climb or descend. Very light and economical.
I have a feeling that I'm going to get a lot of use out of this thing. I
even think that it worked, I didn't feel much more stupid at FL210 than I do
at sea level!

N5ZQ is a small tail 320 with the long engine mount, a stock 160 hp
carburated O-320 with Lazar ignition, and an MT two blade prop. Engine
readings are from a Vision Micro VM1000.  Takeoff weight was about 1500 lbs
and I climbed directly to FL210. I didn't notice any of the adverse handling
characteristics that Ed found. The airplane handled in the flight levels the
same as it does at low altitude at the same indicated airspeeds. Here are
the numbers I got, starting at 10,000.


                    CLIMB
LEANED-FULL THROTTLE -2630 RPM-KNOTS

DEN ALT    IAS    TAS    ROC    FF
10,000        140    161        460    6.8
11,000        140    163        400    6.5
12,000        135    160        330    6.5
13,000        130    158        460    6.4
14,000        130    160        450    6.4
15,000        125    157        440    6.3
16,000        120    151        330    6.1
17,000        120    153        260    5.5
18,000        115    149        250    5.4
19,000        105    142        480    5.3
20,000        100    137        200    5.2

CRUISE  -  LEAN MIXTURE  -  KNOTS
FL        IAS    TAS    OAT    MP    RPM    FF
210        112    159    -9        12.9    2630    5.0
200        118    165    -9        13.1    2630    5.1

ALT        DA            IAS    TAS    MP    RPM    FF
17,500    18,100        124    164    15.5    1900    4.2
17,500    18,100        120    157    15.5    1750    4.0
17,500    18,100        110    145    15.5    1600    3.7

This flight was at a light weight and in mostly smooth air. With it's little
Cessna 172 motor, FL 210 seemed to be about all it could do. Might have
gotten 220 out of her if I were patient enough. At heavier weights I doubt
if she'd make it above 190. However, it's great to have the ability to get
up even this high to take advantage of tail winds or to get over weather.
And with a fuel flow of 3.7 gph, my 54 gallons could sure last a long time
if I needed it to.

Bill
harrelson@erols.com
N5ZQ


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