Today's Message Index:
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1. 01:44 PM - Re: more prop test info (N1BZRich@AOL.COM)
2. 03:14 PM - flight plan code (Tex Mantell)
3. 04:08 PM - Re: flight plan code (JOSEPH MATHIAS LINDA MATHIAS)
Message 1
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Subject: | Re: more prop test info |
In a message dated 8/14/2009 4:12:18 P.M. Eastern Daylight Time,
corky@hbci.com writes:
Buz
Here is what I came up with
prop hub at zero degrees
Blade 1 Blade 2
6" in from tip 21 degrees ---- 21.25 degrees
12" in from tip 26 degrees ---- 26 degrees
18" in from tip 30.5 degrees ---- 31 degrees
it is hard to get an accurate measurement at 18" because of the contour
thanks Dave
Dave,
I came up with basically the same numbers. After removing the top
cowling and making sure the top of the engine was level by shimming under the
wheels, I then leveled the prop and took the measurements. Six inches in
from the tips measures 21 degrees, 12" in measures 26.5 degrees, and 18
inches in measures 30 inches for both blades - essentially the same
measurements you got.
If you are sure of the accuracy of your airspeed system and tach, then
something on you airframe must be slightly higher drag than on mine. So
are you sure about your instrumentation?
If so, then starting at the front, here are some airframe areas to
look at that many people miss:
-How tight does the back of your spinner fit to the from of your cowl?
Anything over about 1/4 inch is probably starting to get too wide. Mine is
more like 1/8 inch.
-Engine cooling drag can be quite high. Don't know how you have yours set
up, but if you look at how the prototype Lightning was set up, that is
pretty much the way 31BZ is set up. Nick pretty much did the same to the
prototype that we had done on 31BZ.
-Next, the canopy is pretty flexable and tends to spread out along the
canopy rails the faster you go. This produces a relatively high drag area and
gets worse the faster you go. It is caused by both airflow around the
canopy and airflow into the cockpit if you have the cockpit vents open. So
two fixes may be required. First, a fix to vent the cockpit air pressure and
another to keep the canopy from flexing out in flight. Nick fixed this
on the Lightning by including the pins on the early ones and then tabs on
the later ones that hold the canopy rails in. I have modified my airplane
with similar tabs. Makes a big difference in noise and drag. If you are
hearing airflow noise, you are hearing drag.
-Fit of the gear leg fairings are an obvious area to make sure you have
good fit. Mine fit tight up against the fuselage (with rubber moldings) and
tight against the pants with basically no gaps. Also make sure they are
streamlined with the fuselage. (you will have induced yaw if they are not)
Wheel pant fit is also important. Do your inboard axles stick out? Mine
do not - there is a fairing on each one to cover that.
-I have reflexed my flaps and ailerons up slightly. The difference is
noticeable, particularly at the speeds I cruise at.
-Lastly, on the color spectrum, white and silver are the fastest colors,
while red, dark blue, and black are the most maneuverable. Also, keep your
paint scheme to mostly straight lines along the flight path of the airplane
for the least drag. Curvey lines produce drag.
-Obviously a slight bit of "tong in cheek" about that last point, but the
others are some things you might want to look at.
Blue Skies (the high drag kind)
Buz
Message 2
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Subject: | flight plan code |
I believe its box 3 on the form 7233-1 (flight plan). On my Kitfox I use
(HXB/U). What has anybody been using for the Lightning when filing your
flight plan?
Thanks TEX
Message 3
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Subject: | Re: flight plan code |
Hi Tex,
The correct code for the Lightning is HXB with the equipment code
appropriate for your plane.
Happy flying, Linda
----- Original Message -----
From: Tex Mantell
To: lightning List
Sent: Monday, August 17, 2009 6:06 PM
Subject: Lightning-List: flight plan code
I believe its box 3 on the form 7233-1 (flight plan). On my Kitfox I
use (HXB/U). What has anybody been using for the Lightning when filing
your flight plan?
Thanks TEX
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Checked by AVG - www.avg.com
08/17/09 06:08:00
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