Today's Message Index:
----------------------
1. 06:38 AM - RV8 for sale (John Huft)
2. 01:44 PM - Timing adjustments in flight and affect on EGT/CHT (Wheeler North)
3. 03:06 PM - Re: Timing adjustments in flight and affect on EGT/CHT (n801bh@netzero.com)
4. 03:27 PM - Re: Timing adjustments in flight and affect on EGT/CHT (Richard E. Tasker)
5. 05:04 PM - Re: Timing adjustments in flight and affect on EGT/CHT (John Huft)
6. 05:14 PM - New Aviation TV Show (Robin Marks)
7. 10:25 PM - Slobovia Outernational Pumpkin Drop 2010 (Charlie England)
Message 1
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RV8 For Sale
Well, I had hoped it would be another 20 years before I had to write
this,
but I have lost my medical.
So, my award and race winning RV8 =93Nuisance=94 is for sale. I am
asking $125K
for her.
I have a website that is not quite up to date at
http://lazy8.net/rv8.html
The airplane has about 550 hours tach time. The blended airfoil prop has
about 250 since new.
If you like to fly fast, or just fly with your buds and use less fuel,
here
is a good airplane for you. Last year she won the metal airplane class
at
the CAF=C9 Fuel Venture 400 for fuel efficiency. She has dominated the
RV
classes at the SARL races since they started, and in fact the only time
she
finished second in the last five years was this summer=92s AirVenture
Cup,
where she got beaten by Dave Anders. That includes beating the so-called
fast one, Dick Martin, in his 390 powered RV8, 3 times. A number of
times in
SARL races she beat Rockets on half the fuel.
She now has a full glass panel with mechanical backups=85Garmin 696,
AFS-3500,
Garmin 430W and 327 xponder, and TruTrak Digiflight II VSGV. She has
always
been hangared, and is in excellent condition.
John Huft john@lazy8.net 970-759-1600
Message 2
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| Subject: | Timing adjustments in flight and affect on EGT/CHT |
Colleagues,
Here is some interesting data from a flight I took yesterday. I've installed
the Generation3 ignition system (http://www.g3ignition.com/) which allows me
to vary timing from the cockpit.
http://miravim.org/FlightData/index.php links to a page where you can
download the .xlsx file.
The charts on the left of worksheet two show parameters of timing being
changed from 20 to 35 deg BTDC then back to 20 at the very end. Note how EGT
and CHT exchange. As timing is advanced EGT decreases and CHT increases. The
one anomaly is the first section of CHT shows some cooling, I did not wait
long enough for them to stabilize after a climb. I guess it takes five
minutes, because I did wait three minutes.
The charts on the left are about my very large cowl flap I have in the
bottom of the cowl below/behind the carb. Note how it acts like a speed
brake. I was also surprised at how much the EGTs also got cooler. This data
shows that RVs get plenty of air in, they just need more air to exit,
particularly during high load and high angle of attack.
Thus the data shows that two things you can do for high CHTs is retard the
timing (There is an SB that allows 20 Deg instead of 25), or make a bigger
hole in the bottom, or both.
The cowl flap is driven by one of the new Ray Allen hi thrust servos...
which I don't see listed on their website, but the thing really puts out.
http://www.rayallencompany.com/index.html
W
Message 3
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| Subject: | Re: Timing adjustments in flight and affect on EGT/CHT |
Your observations are correct.
Late ignition timing will lead to higher EGT's because some of the firi
ng event is already on the way out the exhaust pipe, so to speak. This i
s a simplified explaination but you sholud get the drift. Heat out the p
ipe is wasted energy.
Advanced timing lets the explosion happen sooner so there is a longer du
ration of downforce on the piston and that converts to greater power, th
at also is the reason the CHT's are higher with advanced timing. The hea
d absorbs more heat because the firing event happens earlier in the rot
ation of the motor and it heats up the Cyl head and less is passed out
the pipe. The more heat you can convert to rotation the higher HP you wi
ll make. Just get too greedy with the advance timing and detonation will
set it and good bye pistons, then rings, then rod bearings. There is a
fine line between optimum timing and disaster. Thats way FADAC is so goo
d at what it does. IMHO
Ben Haas
N801BH
www.haaspowerair.com
---------- Original Message ----------
From: "Wheeler North" <wnorth@sdccd.edu>
Subject: RV-List: Timing adjustments in flight and affect on EGT/CHT
Colleagues,
Here is some interesting data from a flight I took yesterday. I've insta
lled
the Generation3 ignition system (http://www.g3ignition.com/) which allow
s me
to vary timing from the cockpit.
http://miravim.org/FlightData/index.php links to a page where you can
download the .xlsx file.
The charts on the left of worksheet two show parameters of timing being
changed from 20 to 35 deg BTDC then back to 20 at the very end. Note how
EGT
and CHT exchange. As timing is advanced EGT decreases and CHT increases.
The
one anomaly is the first section of CHT shows some cooling, I did not wa
it
long enough for them to stabilize after a climb. I guess it takes five
minutes, because I did wait three minutes.
The charts on the left are about my very large cowl flap I have in the
bottom of the cowl below/behind the carb. Note how it acts like a speed
brake. I was also surprised at how much the EGTs also got cooler. This d
ata
shows that RVs get plenty of air in, they just need more air to exit,
particularly during high load and high angle of attack.
Thus the data shows that two things you can do for high CHTs is retard t
he
timing (There is an SB that allows 20 Deg instead of 25), or make a bigg
er
hole in the bottom, or both.
The cowl flap is driven by one of the new Ray Allen hi thrust servos...
which I don't see listed on their website, but the thing really puts out
.
http://www.rayallencompany.com/index.html
W
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____________________________________________________________
FIRE SALE: iPads for $23.74?
SPECIAL REPORT: iPads are being auctioned for an incredible 85% off!
http://thirdpartyoffers.netzero.net/TGL3241/4cc35b1a631f63d9c33st06vuc
Message 4
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| Subject: | Re: Timing adjustments in flight and affect on EGT/CHT |
It would be nice to see the results as listed in your spreadsheet.
Unfortunately, not all of us have access to the latest and greatest
Excel version. How about saving a copy in an earlier format?
Dick
Wheeler North wrote:
> --> RV-List message posted by: "Wheeler North"<wnorth@sdccd.edu>
>
> Colleagues,
> Here is some interesting data from a flight I took yesterday. I've installed
> the Generation3 ignition system (http://www.g3ignition.com/) which allows me
> to vary timing from the cockpit.
>
> http://miravim.org/FlightData/index.php links to a page where you can
> download the .xlsx file.
>
> The charts on the left of worksheet two show parameters of timing being
> changed from 20 to 35 deg BTDC then back to 20 at the very end. Note how EGT
> and CHT exchange. As timing is advanced EGT decreases and CHT increases. The
> one anomaly is the first section of CHT shows some cooling, I did not wait
> long enough for them to stabilize after a climb. I guess it takes five
> minutes, because I did wait three minutes.
>
> The charts on the left are about my very large cowl flap I have in the
> bottom of the cowl below/behind the carb. Note how it acts like a speed
> brake. I was also surprised at how much the EGTs also got cooler. This data
> shows that RVs get plenty of air in, they just need more air to exit,
> particularly during high load and high angle of attack.
> Thus the data shows that two things you can do for high CHTs is retard the
> timing (There is an SB that allows 20 Deg instead of 25), or make a bigger
> hole in the bottom, or both.
> The cowl flap is driven by one of the new Ray Allen hi thrust servos...
> which I don't see listed on their website, but the thing really puts out.
> http://www.rayallencompany.com/index.html
> W
>
>
>
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Message 5
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| Subject: | Timing adjustments in flight and affect on EGT/CHT |
Thanks very much for posting!
What was the density altitude? Fixed pitch prop?
John
-----Original Message-----
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Wheeler North
Sent: Saturday, October 23, 2010 2:40 PM
Subject: RV-List: Timing adjustments in flight and affect on EGT/CHT
Colleagues,
Here is some interesting data from a flight I took yesterday. I've installed
the Generation3 ignition system (http://www.g3ignition.com/) which allows me
to vary timing from the cockpit.
http://miravim.org/FlightData/index.php links to a page where you can
download the .xlsx file.
The charts on the left of worksheet two show parameters of timing being
changed from 20 to 35 deg BTDC then back to 20 at the very end. Note how EGT
and CHT exchange. As timing is advanced EGT decreases and CHT increases. The
one anomaly is the first section of CHT shows some cooling, I did not wait
long enough for them to stabilize after a climb. I guess it takes five
minutes, because I did wait three minutes.
The charts on the left are about my very large cowl flap I have in the
bottom of the cowl below/behind the carb. Note how it acts like a speed
brake. I was also surprised at how much the EGTs also got cooler. This data
shows that RVs get plenty of air in, they just need more air to exit,
particularly during high load and high angle of attack.
Thus the data shows that two things you can do for high CHTs is retard the
timing (There is an SB that allows 20 Deg instead of 25), or make a bigger
hole in the bottom, or both.
The cowl flap is driven by one of the new Ray Allen hi thrust servos...
which I don't see listed on their website, but the thing really puts out.
http://www.rayallencompany.com/index.html
W
Message 6
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| Subject: | New Aviation TV Show |
Just came across this TV show on DirecTV. First show featured SNF.
http://www.theaviators.tv/TheAviators.TV_-_Home.html
Darn, now I want to build one of these. Noooooooooooooooo:
http://aircam.com/gallery/
Robin
Message 7
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| Subject: | Slobovia Outernational Pumpkin Drop 2010 |
You're cordially invited to the "Lower Slobovia Garden Club" 4th annual
Pumpkin Drop, starting at 11:00 AM on Saturday, November 6, 2009. Lunch
will be served at noon, and pumpkin drop demos begin around 1:30 PM.
Contact info for driving directions is on the attached flyer; nav info
is at
http://www.airnav.com/airport/MS71
Y'all come!
Charlie & Tupper, for the Lower Slobovia Garden Club members
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