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lozhoffman(at)yahoo.com
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 Posted: Thu Aug 03, 2006 5:43 pm Post subject: [esqualtalk] Re: Pilot Report - Lightning |
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Buz
No worries...I already had the calculator out before I
got to your P.S.
Laurie
--- N1BZRich(at)aol.com wrote:
| Quote: |
In a message dated 8/3/2006 12:32:04 A.M. Eastern
Daylight Time,
corky(at)hbci.com writes:
Keep in mind, the flap gap cover is installed under
the upper side to make
the flap fit tight when up. If yours is like mine,
you won't need that.
Hi Dave,
Sorry I missed you at OSH. I found your card
so knew you had been by.
I am not sure what you are saying about your
aircraft not needing a flap gap
cover. The underside of my wing had a relatively
large gap between the wing
trailing edge and the flap when they are up. That
is where I think I can
lower some of the parasite drag. The top side of
the wing has a nice tight fit
when the flaps are up. The other underside of the
wing change I have planned
is to streamline around the fuel drains. May try
some type of aileron gap
seal if the flap gaps help. I really don't see the
need for rudder and
elevator gap seals as my airplane is relatively
tight in those areas - no gaps to
speak of.
Just tonight I found what I am looking for to do
the flap gaps - mylar
from a sailplane supply house. Tomorrow after
taking some measurements I will
order some for my airplane and the prototype. Nick
and I will post the
results here when the additional testing is done on
each aircraft.
My antennas are already inside the fuselage.
Also, I have the Lightning
cowling so that is good for some drag reduction
already. The other big drag
reduction effort of 31BZ was the fitting of Van's
gear leg fairings and
their latest style wheel pants. Both of those
changes together were good for
something over 20 mph and probably close to 200
rpm.
I measure my prop pitch at 12 inches in from
each tip and currently have
23 degrees set. I think that is about the
equilivant of 54 inches of pitch.
I say that because I measured a fixed ptich 54
inch prop and it read 23
degrees. I know that is not exact science, but it
is a starting point. I don't
use the hub indicator at all and have no idea what
it reads.
You didn't say at what speeds you were climbing
to get the 2750 on climb
out. Initially on TO roll, I only get about 2650 to
2700 and then after
lift off I accelerate to 85 and climb at that until
the end of the runway. At
that point I lower the nose slightly and climb at
100. I am seeing the 2750
during climb out at 100. OATs recently have been
100, but the only thing
that seems to effect is rate of climb (down to 1200
or so fpm) - speeds and rpm
are pretty much the same.
At 5000' in level flight I can turn up about
3250 but it takes a while
to get there. At 2850 I can get 138 indicated up to
as high as 6000'. Best I
can remember I have a 250 jet. Run your finger
around the inside of your
exhaust. If you get black you are too rich. At
full power at altitude what
happens if you pull the carb heat on? That can
also be an indicator that you
might be too rich. All I can suggest now is to
reduce your cowling drag (the
Esqual stock cowl is much draggier than the
Lightning), add the gear leg
fairings and low drag wheel pants.
Blue Skies,
Buz
PS: Sorry Laurie, all about speeds are MPH> Did
not have time to convert.
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Charles Heathco
Joined: 10 Jan 2006
Posts: 201
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| Posted: Mon Aug 07, 2006 5:16 am Post subject: [esqualtalk] Re: Pilot Report - Lightning |
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Hey guys, did you miss the email where I listed posible places to get this0 mylar strip? Charlie H
[quote] ---
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N1BZRich(at)AOL.COM
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| Posted: Mon Aug 07, 2006 5:20 am Post subject: [esqualtalk] Re: Pilot Report - Lightning |
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I must have, Charlie, please re-post.
buz
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Charles Heathco
Joined: 10 Jan 2006
Posts: 201
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| Posted: Tue Aug 08, 2006 3:41 am Post subject: [esqualtalk] Re: Pilot Report - Lightning |
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Couple of my friends had those mylar strips on their Cherokees. I think0 they got them from Art Matsen, Or Lopresti.I also bought mylar strips from Vans0 to go on flaps(not a gap seal) I cant remember as I never put them on, but think0 they were only about 2 1/2 in wide. Charlie
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pete(at)flylightning.net
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| Posted: Tue Aug 15, 2006 5:43 am Post subject: [esqualtalk] Re: Pilot Report - Lightning |
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Dave,
You must have a problem with the pitot static system if you are reporting
only 126 mph at 2850 with all the fairings. Even the 2200 powered Esqual
with the fairings will do more than that at 2850. Have you done a pitot
static check or determined if there is a leak in the system that would
result in readings that low? Even at the pitch you have the prop set at you
will do more than 126 mph without fairings.
As far as the carb tuning - the carb must be tuned to the prop load on the
engine. If you are seeing 1450+ at cruise at that prop pitch you probably
have less prop load on the engine that the carb is tuned for. Less prop
load results in a lean mixture since less vacuum is delivered to the top
side of the carb dome. Less vacuum there results in the diaphragm not
pulling the needle up far enough out of the jet to provide the correct
mixture. First step - since the engine shakes at full rpm is to try a
larger main jet. If you had a 255 before try a 265. That should richen the
mixture at full throttle. If you are running rich instead of lean then the
condition will be worse. If it is rich then try a 245 main and see if it is
better.
Pete
_____
From: esqualtalk(at)yahoogroups.com [mailto:esqualtalk(at)yahoogroups.com] On
Behalf Of Dave
Sent: Tuesday, August 15, 2006 5:46 AM
To: esqualtalk(at)yahoogroups.com
Subject: Re: [esqualtalk] Re: Pilot Report - Lightning
Buz
Thanks for all the info. It sure helps
1. I do have the Vans wheel pants on
2. I have the Vans fairings also on
3. I am running the carbon Sensenich prop (at) 19.5 at 12
inches in
4.My cruise at 2850 is at 126 mph indicated.
5. Last night at 5000 ft with oats of 68, the engine was
struggling at 3150 "missing"
Believe it or not, I showed no increase in speed with pants or fairings, I
still believe the engine is not putting out what it should, today I will
play with the float levels.
Stumped - Dave
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corky(at)hbci.com
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| Posted: Tue Aug 15, 2006 12:59 pm Post subject: [esqualtalk] Re: Pilot Report - Lightning |
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Pete
thanks for the help
I did a pitot static check and found no leaks or tight bends in lines.
I tried a 245, 250, 255 main. The 245 gave me redline egts having the prop set at 20 degrees. All jets gave same result- engine shake at full rpm.
Pete, could the timing advance at full rpm be affecting this and how does one check this? It seems the engine is not putting out full power. It is burning about 6 oz oil per hr.
stupid- I mean -stumped, Dave
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pete(at)flylightning.net
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| Posted: Tue Aug 15, 2006 1:31 pm Post subject: [esqualtalk] Re: Pilot Report - Lightning |
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Dave,
Since the jetting does not seem to change the situation, then the next
possible culprit would be the air intake to the carb. The flow into the
carb must be as smooth as possible. Too tight a bend in the SCAT hose close
to the carb will result in turbulent air into the carb and at high rpms will
cause the diaphragm to bounce and richen the mixture. Carefully check the
intake routing to make the air go straight in for the last few inches of
Scat duct before the carb.
I still think there is an airspeed error. 2850 rpm with that prop will
propel a Jabiru aircraft faster than 126 mph. It is impossible for me to
believe that at 2850 rpm an Esqual would be slower than a Jabiru. 126 knots
might be in the relm of possibility but not 126 mph. It makes no sense. I
think you should fly it down here and we'll find a way to straighten it out.
Pete
_____
From: owner-lightning-list-server(at)matronics.com
[mailto:owner-lightning-list-server(at)matronics.com] On Behalf Of Dave
Sent: Tuesday, August 15, 2006 3:59 PM
To: lightning-list(at)matronics.com
Subject: Re: [esqualtalk] Re: Pilot Report - Lightning
Pete
thanks for the help
I did a pitot static check and found no leaks or tight bends in lines.
I tried a 245, 250, 255 main. The 245 gave me redline egts having the prop
set at 20 degrees. All jets gave same result- engine shake at full rpm.
Pete, could the timing advance at full rpm be affecting this and how does
one check this? It seems the engine is not putting out full power. It is
burning about 6 oz oil per hr.
stupid- I mean -stumped, Dave
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corky(at)hbci.com
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| Posted: Tue Aug 15, 2006 4:27 pm Post subject: [esqualtalk] Re: Pilot Report - Lightning |
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Pete,
You are a genius, thanks so much for taking the time to baby-sit me. I did a re-check of pitot line and it was ok. Before flight I removed static line. All of the sudden I am doing 160 TAS. During flight I reached down and reattached static line and went back to 125 mph, thanks so much for help!
My scat tube has a sharp bend before the carb with excessive scat tube prior to the clamp. I see in the 3300 manual an elbow is offered. Do you offer this?
THANKS AGAIN - Dave
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