Today's Message Index:
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1. 12:00 AM - Re: Vents (BobD)
2. 12:59 AM - Re: Vents (John Wighton)
3. 04:40 AM - Re: Re: Vents (Bud Yerly)
4. 05:08 AM - Re: Re: Vents (GTH)
5. 05:55 AM - Re: Europa pitot tube piping and connections (Chris Callicott)
6. 08:39 AM - Re: Vents (Remi Guerner)
7. 01:09 PM - Re: Vents (Patrick Tunney)
8. 03:05 PM - Re: Vents (Griffo)
Message 1
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Bud Yerly's excellent paper on Cockpit Ventilation has been added to the repository
of his articles on the Europa Club website.
https://www.theeuropaclub.org/building/the-bud-yerly-notes
BobD
Treasurer
The Europa Club
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Bob Dawson
Europa XS TG || 912 ULS || G-NHRJ || Dynon Skyview || PilotAware || SmartAss3
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Message 2
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This is the sketch of the vent position.
The red boundary is the recommended zone.
The yellow boundary is generally considered too far back.
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John Wighton
Europa XS trigear G-IPOD
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http://forums.matronics.com/viewtopic.php?p=501154#501154
Attachments:
http://forums.matronics.com//files/proposed_position_of_vent_410.jpg
Message 3
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Griff,
NO, I did not address the noise level.
With headsets, addressing noise is a function of mic settings, air blast direction,
ANR vs non, engine type and exhaust, propeller type and airspeed.
Anything allowing wind blast into the cockpit is going to make noise.
Those with NACA vents down by the leg or below the cruck of the knee won't hear
much.
Those with piping from the rear (tail fin) up to the cockpit won't hear (or feel)
much either.
The ultimate vents in my windows can be heard with non ANR headsets slightly when
directed at the face.
The door style intake tends to be noisier than the ultimate style.
The in the glass hinged door is awful if placed near the face (about half way back
on the door).
So not much help really. I am normally more concerned with the engine and prop
noise.
I find the two blade props (older Whirlwind hydraulic, Sensenich blades in the
Airmaster AP420) to be noisier due to the wide chord power pulses hitting the
screen.
The windscreen in some planes acts like a drum skin so prop noise is noticeable.
Exhaust of a Jabiru or Rotax 912 series exited under the belly is noisy also.
Survival from heat stroke in the cockpit in summer means more to me than db level
of the vent.
Just an opinion.
Bud Yerly
-----Original Message-----
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matronics.com>
On Behalf Of Griffo
Sent: Monday, March 29, 2021 9:53 PM
Subject: Europa-List: Re: Vents
Bud: I may have missed it but did you address wind noise ? I have always been concerned
about "things" that project into high speed air.
Paul: Yes please, on the offer of photos.
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46
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Le 28/03/2021 19:16, Bud Yerly a crit:
> I've had many discussions over the years on cockpit ventilation and I summarized
them in a pdf for you guys to look at. I'm always interested in how to make
things work.
Bud and all,
Most interesting document, congratulations!
Just one point, I'm of the opinion that the Rotax engines generate
largely enough heat to make a functional heating.
Remember a reciprocating engine rejects about as much heat energy as
mechanical output on the prop shaft. That's a lot of calories (or BTUs)
The key point is having a sufficient flow of sufficiently hot air.
It only works with a proper cooling air nozzle behind the radiator(s) so
hot air is under pressure.
Here is an example of such a cockpit heating system, with a very
satisfactory efficiency.
http://contrails.free.fr/cellule_chauffage_en.php
Easily adaptable to an Europa.
FWIW
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
Message 5
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Subject: | Re: Europa pitot tube piping and connections |
A very belated thanks for your reply Kevin.
Problem now sorted.
Test flight very soon!
Chris
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http://forums.matronics.com/viewtopic.php?p=501157#501157
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The attached pictures illustrates what I did to improve the original Naca vents
on my Europa. Works very well. For details read my article in EF84.
Remi
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Attachments:
http://forums.matronics.com//files/pic7_passenger_vent_184.jpg
http://forums.matronics.com//files/pic5_passenger_conduit_installed_151.jpg
Message 7
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Many thanks Steve
The location is pretty much in line with my thinking and also comments from other
owners i have spoke to that felt the vents needed to be higher than the europa
reference position.
Regards
Pat
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Message 8
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Hi Bus,
Thank you for your "noise" response - very much as I expected.
I have both ANR /passive headsets, however following the KISS principals, I prefer
the passive. Where practical will try for cockpit noise reduction & treat
the disease, not just the symptoms)
With regard to your prop/engine noise comments - I am hoping to have more experience
in a Europa shortly - to date most of my LSA experience has been in a Rotax
912 ULS motivated ATEC Zephyr, using a 2 blade Fiti (ground adjustable) prop.
Aircraft noise external/internal was very low - inflight, cockpit conversation,
without headsets, was quite easy. I fitted an automotive security siren
to alert my family when I was passing overhead. I appreciate differences in aircraft
construction/design will effect noise generation and thus may not be applicable
to another.
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46
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