Today's Message Index:
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1. 06:02 AM - Re: A lot to look forward to and be thankful for! (William Daniell)
2. 06:33 AM - Revised Europa Specifications (Remi Guerner)
3. 01:52 PM - Re: Revised Europa Specifications (rampil)
4. 02:23 PM - Re: Revised Europa Specifications (rampil)
Message 1
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| Subject: | A lot to look forward to and be thankful for! |
Bud
If I can do anything for you in South America let me know
Will
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of ALAN YERLY
Sent: Tuesday, December 23, 2008 21:27
Subject: Europa-List: A lot to look forward to and be thankful for!
I looked at all my family visiting tonight at dinner, and am thankful not
just for them but my extended family of aviation enthusiasts, Europa
builders and owners. I can't believe how blessed I am with good health
(allowing for the extra fat and baldness), an excellent airplane design to
go thrashing about in, and a family of Europa builders and fliers, who share
their experiences and even allow an dumb fighter pilot like me to share my
experiences with them once in a while. (Don't forget Mat Dralle as keeper
of the site we all use.)
As a dealer for the aircraft, I am thankful that you all contributed to
keeping the spirit of Europa alive, and as a result, we are blessed to have
a revival of the company. Believe it or not, all your suggestions are being
worked, massaged, cost analyzed, and already some are being implemented.
Thanks to Roger Bull, and John Wheeler for carrying the flag, and now under
the leadership of Dave Stanbridge the company enjoys new energy and is
progressing at a brisk pace.
Marketing strategies are in place, air-show dates set, the website is
drawing potential buyers, advertising is coming out soon, and more
importantly, your feedback is making the product better, easier to build,
and cost effective.
Since I last spoke at the Rough River Fly-in, we have really taken off. The
aircraft is being worked from nose to tail. From tail plane mods to new
nose wheel axels, new parts and construction methods are coming to make the
plane easier to build and maintain. From wingtip to wingtip, manufacturing
efficiencies are being tested, evaluated and implemented. The motor glider
wing is in final test and approval phase for world wide sales, and a whole
new LSA wing is in design. Gross weight increases and structural analysis
evaluations are in the works also. All this adds value to our existing
aircraft.
There is a new spirit at Europa and I am excited to be part of it. In the
next few months, you will see more coming, and we look forward to your
input. Please keep the information on your experiences, performance, and
suggestions coming. All of your contributions are important. They do not
fall on deaf ears. After all, we are a family.
Have a happy holiday season, and a safe and prosperous new year.
Bud Yerly
Custom Flight Creations
US Europa Dealer
Owner A54A now ready for engine run and airworthiness inspection.
Unless I get another idea for a mod.
Checked by AVG - http://www.avg.com
12:08
Message 2
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| Subject: | Revised Europa Specifications |
Hi Ira,
It is interesting to compare your computed figures with those from ROTAX
and DIAMOND.
Based on fig.14, page 10-8 of the ROTAX 912ULS Owner Manual, the engine
should be capable of producing 75 % power at 8000 ft at full throttle
and 5500 RPM. This is not 75% of 100 HP but 75% of the max continuous
power of 94 HP, i.e. 69 HP. At 8000 ft, full throttle, 5000 RPM, the
power is 59.5 %.
Below is what Diamond shows on the Katana DA20-100 Flight Manual. This
aircraft is JAR-VLA certified and uses the same 912S engine. The Manual
is available on line on the Diamond website. Below are their cruise
figures at 8000 ft. :
5500 RPM, 22 In.Hg: 75% of max continuous power (assumed to be at full
throttle):
5350 RPM, 21,7 In.Hg: 65% (probably not at full throttle)
5100 RPM, 21 In.Hg: 55% (probably not at full throttle)
The Diamond figures are consistent with the Rotax ones at 5500 RPM but
not for the other power settings.Your computed figures differ
significantly from both the Rotax and the Diamond figures.
One interesting thing is that Diamond provides fuel flow figures. This
confirms the higher you fly with the Rotax, the more fuel you use. A
typical exemple is 18 liters/hour at 75% at 0 ft and 23,6 l/h at the
same power at 8000ft. That is a 31% increase!
Regarding the advertised cruising speed of the Europa, I have made
numerous measurements using the 3 way GPS method and consistently get
135 kts TAS at 8000 ft, full throttle and 5000 RPM, which is about 60%
power according to Rotax. This is for an XS monowheel with 912 ULS,
Airmaster prop and speed kit. So it seems that the advertised 140 kts at
75% at 8000 ft are absolutely achievable, provided you accept to cruise
at 5500 RPM.
Best regards and Merry Christmas
Remi Guerner
F-PGKL
>>> At 8000' DA, the 912s can not make 75% power in cruise. Since the
Rotax factory does not provide sufficient data, I modeled power
Output with a simple linear model of MP and RPM. At 8000', at
takeoff rpm (limit 5 min) 5750 RPM, the engine provide 73%. At
5500 (constant pitch prop), the output is 70%, and at standard
cruise rpm of 5000 rpm, the output is 63%. That said, with the
speed kit installed and a fresh wash, I do see in the range of 135kt
TAS at 5000rpm at 8000'.
Message 3
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| Subject: | Re: Revised Europa Specifications |
Hi All,
Thanks for the input Remi!
I think Rotax is using a sleigh of hand, inconsistently using a moving
target for power output. The engine is advertised as 100 hp, and
only in fine print does one see a 5 min max duration for the rated power.
Therefore I was using the advertised power rating in my table, which
I enclose below. I can put 75% of max continuous power in fine
print on the table. The table is a simple model, but I find it useful since
I lack a dyno to test with.
BTW, I published the Diamond power chart some months back since it
confirmed my measured fuel flows as increasing with altitude.
Merry Christmas, Happy New Year,
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220989#220989
Attachments:
http://forums.matronics.com//files/912ulspower_203.pdf
Message 4
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| Subject: | Re: Revised Europa Specifications |
For fun, here is some of my fight test data from June 2006
demonstrating the lack of altitude compensation of mixture in
the Bing 64 carb.
I keep hoping that someone will report (favorably) on the Greensky
manual mixture control for the 912s
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=220992#220992
Attachments:
http://forums.matronics.com//files/fuelvsalt_sheet1_128.pdf
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