Today's Message Index:
----------------------
1. 07:28 AM - Re: Rotax carb choke problem (Kevin Klinefelter)
2. 08:12 AM - Re: Day VMC only (rampil)
3. 12:37 PM - Re: Instrument module cooling/demisting fans. (rparigoris)
4. 02:36 PM - Rotax air consumption (Paul McAllister)
5. 02:56 PM - Re: PH-DIY first flight! (Frans Veldman)
6. 03:52 PM - Re: PH-DIY first flight! (DuaneFamly@aol.com)
7. 04:20 PM - Re: Rotax air consumption (rparigoris)
8. 04:25 PM - Re: PH-DIY first flight! (rparigoris)
9. 04:50 PM - Re: Re: PH-DIY first flight! (Paul McAllister)
10. 08:02 PM - Re: Rotax air consumption (craig bastin)
Message 1
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Subject: | Re: Rotax carb choke problem |
Hi Franz,
When you recheck your float bowls for the choke problem you are having, you
can just pull the bowls without removing the carb from the engine? At least
that's what I would try first because I'm lazy!
Kevin
Message 2
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Subject: | Re: Day VMC only |
There are different classes of experimental aircraft in the US.
Some types are restricted to certain areas or require FAA notification
to move. These restrictions do not encumber owner-built experimental
aircraft in practice.
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=295548#295548
Message 3
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Subject: | Re: Instrument module cooling/demisting fans. |
Figure if anyone is interested in installing cooling fans, might as well keep in
archives a slick way to give you high and low speeds (you need an even number
of fans). The LED either gets full voltage or half.
http://www.europaowners.org/forums/gallery2.php?g2_itemId=79799
Ron Parigoris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=295565#295565
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Subject: | Rotax air consumption |
Hi all,
I was wondering if anyone has come across any Rotax 914 data that will tell
me the airflow into the engine for various power settings. I have looked on
a few of the auto enthusiasts web sites and for the follow parameters I get:
0 centigrade
5100 RPM
30"
I get 87,700 cfm
Does that sound about right ?
Message 5
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Subject: | Re: PH-DIY first flight! |
On 04/22/2010 02:55 AM, Kevin Klinefelter wrote:
> I hope you
> both have as much fun as I am having!
Sure we have!!!
Today we both have been flying, first with our test pilot, and after a
few touch & go's we were released and could fly ourselves.
The PH-DIY is flying better than we ever hoped for! A very light and
responsive airplane. Easy to fly as well. We just have to get used to
the very light controls (everything we did in the Cessna we have to
divide by 4 or so), and of course it is interesting to reach pattern
altitude after take off before even reaching the crosswind leg. We think
it is easier to get use to, than to wean off it.
The stall is indeed benign and can be executed hands off, with and
without flaps. It is a total non event, with plenty of warning in the
form of buffeting, and the aircraft will recover without human
intervention. Keep the stick fully aft and she will descend in a rocking
motion, alternating stalling and recovering by herself.
The performance is great! The test pilot first took her out alone, to
measure the performance again, but this time in still air (couldn't
believe what he had seen during the first flight), but came back with
the famous Europa grin and told us that it was even better than he
thought it was! This thing is blazingly fast!
We put a small rudder trim tab on the rudder (btw, yes, the engine is
perfectly aligned), and the trim tab was perfect on the first try.
Problem solved.
There are a few minor issues with the avionics, but nothing serious.
We now know why we have put so much time in this project. To everyone
not yet reached the flying stage: It is worth it!
Well, no time for a more detailed review, we are going to sleep, so we
can do tomorrow morning a quick check of all essentials, and then... go
somewhere!
Frans
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Subject: | Re: PH-DIY first flight! |
Congratulations on your accomplishment! I bet the "grin" is even there
while you are sleeping.
Keep the stick fully aft and she will descend in a rocking
motion, alternating stalling and recovering by herself.
Didn't they used to refer to this as a falling leaf descent. Used by
people that were not IFR rated, or in a non-IFR aircraft, but got stuck on top
of a thick cloud layer. Prevented spatial disorientation and subsequent loss
of control until you were below the cloud base and back in VFR?
Mike Duane A207A
Redding, California
XS Conventional Gear
Jabiru 3300A
Sensenich R64Z N
Ground Adjustable Prop
Message 7
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Subject: | Re: Rotax air consumption |
Hi Paul
I am not quite sure how to deal with turbo, venturi restriction and exhaust restriction
but your number of 87,700 cfm seems quite off.
Lets take a simple look at the 914 as a simple air pump not developing any pressure.
We need to keep in mind that since it is a four stroke, you only intake
the displacement once every other revolution. Thus you only intake 1/2 of the
1211cc displacement every revolution (two full breaths of the four) or 605.5cc
per revolution.
Now lets take 5100rpm and multiply it 605.5cc to give us the cc per minute of air
pumped, then multiply it by conversion number of .000035314 to convert cc to
cf. That gives us a tad over 109 cfm.
Not sure what you are after, but a 650cfm carb is quite a big beast compared to
the ability of two type 64 Bing carbs. I can't imagine how large an engine would
be that could handle a 87,700cfm carb, but then again you are looking for
something else? Exhaust design? Or?
You could always measure the exhaust of engine running at that power setting. Take
several sheets of large plastic and make an enclosure. Calculate internal
area and plumb your exhaust to it and time to fill.
Now if you are talking about how many cfm of air the propellor could flow at 30"
and 5100rpm with your Airmaster "ground loop" adjustible prop, perhaps the 87K
is a lot closer. A 10hp motor running a 30" prop may push perhaps 20 or 25K
of air per minute at a very low pressure. My basis for this estimate is my homebuilt
balloon is 95,036cf and I can fill it in under 4 minutes, but then there
is some spill out from the 15 foot diameter mouth.
Hope that helps.
Ron Parigoris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=295585#295585
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Subject: | Re: PH-DIY first flight! |
Hi Frans
Sounds like power off stalls are benign. Have you practiced any power on stalls?
Ron Parigoris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=295586#295586
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Subject: | Re: PH-DIY first flight! |
In my airplane they are called loops.... :)
do not archive
On Sat, Apr 24, 2010 at 6:24 PM, rparigoris <rparigor@suffolk.lib.ny.us>wrote:
> rparigor@suffolk.lib.ny.us>
>
> Hi Frans
>
> Sounds like power off stalls are benign. Have you practiced any power on
> stalls?
>
> Ron Parigoris
>
Message 10
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Subject: | Rotax air consumption |
I think you are way off there, typical V8 car engine, with after market
performance carb are set up for
between 600 and 800cfm, you might be out by a factor of 1000, 87cfm would
seem a bit low though.
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Paul McAllister
Sent: Sunday, April 25, 2010 7:28 AM
To: europa-list@matronics.com
Subject: Europa-List: Rotax air consumption
Hi all,
I was wondering if anyone has come across any Rotax 914 data that will
tell me the airflow into the engine for various power settings. I have
looked on a few of the auto enthusiasts web sites and for the follow
parameters I get:
0 centigrade
5100 RPM
30"
I get 87,700 cfm
Does that sound about right ?
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