Today's Message Index:
----------------------
1. 12:25 AM - Re: Perfect cooling diffuser (Duncan & Ami McFadyean)
2. 03:19 AM - Palm sanders (Mike Gamble)
3. 05:19 AM - Re: First Flight (AlStills)
4. 05:20 AM - Re: Perfect cooling diffuser (Gilles Thesee)
5. 07:02 AM - Re: Perfect cooling diffuser (m.clews)
6. 10:03 AM - Re: Perfect cooling diffuser (GLENN CROWDER)
7. 02:48 PM - Re: Perfect cooling diffuser (karelvranken)
8. 03:35 PM - Europa Parts (Bob)
9. 04:56 PM - Europa Parts (Tim Ward)
10. 05:50 PM - Re: Europa Parts (JR(Bob) Gowing)
Message 1
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| Subject: | Re: Perfect cooling diffuser |
Glen,
What is your ratio(s) of inlet area to outlet area?
I realise that it is adjustable.
Duncan Mcf.
----- Original Message -----
From: "GLENN CROWDER" <gcrowder2@hotmail.com>
Sent: Friday, December 01, 2006 10:28 PM
Subject: Europa-List: Perfect cooling diffuser
>I created an almost exact copy of the Kuchemann/Weber perfect
> diffuser on my Europa to try and keep my 135 hp EA81 cool.
> All cooling on the EA81 is thru the water jacket and none is done by air
> cooling on the 912/914 so the ducting has to be good.
> Both cooling in the air and ground are very good. I can run the
> engine as long as desired at 1800 rpm on the ground without over
> heating even on a 100 F day. In the air, water temps to go 200 F
> after a 2 minute climbout then drop back to 185 for cruise.
> There is a 12" long diffuser section that expands like a bell to
> slow and pressurize the incoming air. After the rad, there is a
> converging duct that accelerates the hot air back to free stream.
> There also is a pull up cowl flap inside the converging section
> that allows most of the incoming air to be shut off under cruise
> conditions, adding 10 mph by cutting the flow and associated
> drag when its not needed. Works great!
>
> Glenn
>
> _________________________________________________________________
> View Athlete's Collections with Live Search
> http://sportmaps.live.com/index.html?source=hmemailtaglinenov06&FORM=MGAC01
>
Message 2
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Thanks toSteve, Kevin and Pete for your inputs - noted.
Steve, what on earth is holding you up now? Is there a problem or is it
just the wheels grinding exceedingly slowly? I feel for you.
Mike
Message 3
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Dan
Any time, Call when you can
Al Stills
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of danbish
Sent: Friday, December 01, 2006 10:47 PM
Subject: Re: Europa-List: First Flight
Al,
Way to go man! Can't wait to see her in action. Will try to get up there
sometime this month if you're going be around. I'll call soon.
Dan
Visit - www.EuropaOwners.org
Message 4
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| Subject: | Re: Perfect cooling diffuser |
Duncan,
>
> What is your ratio(s) of inlet area to outlet area?
What really matters is the ration of outlet area to RADIATOR area. As
already stated on Contrails, too large an opening won't flow more air
than a correctly proportioned one, since it is the radiator that governs
the flow in the duct.
It may help to figure the radiator duct system as a duct with 3 valves
in series. The middle valve is the radiator. As it is partly closed,
opening the other valves more than necessary won't change the overall
throughput.
There is no use opening the outlet more than about 1 time the radiator
frontal area, you would only add drag without increasing air flow
through the radiator. Drag decreases as you reduce outlet area by means
of the cowl flap. In cruise, outlet area should be smaller than the
inlet area to achieve minimum drag. It is advisable to construct the
adjustable cowl flap with a range of openings from 1 time the radiator
area to near zero (power descent on a cold day).
In our setup, inlet area is 25% of the radiator frontal area, whereas
exit cowl flaps can be adjusted from 70% to 0% of the radiator area (410
cm). We currently cruise with flaps adjusted to 18% of the radiator
area, or less on cold days. On summer hot days, best cruise (75% power)
is with the exit adjusted at about 28% radiator area. Of course we open
more in a prolonged climb.
During flight tests I installed a data logging system to check adequacy
of the pressures and temperatures.
Adjusting CHT and oil temps to within 5C of desired temperatures is a
breeze, and we found no special limitations concerning ground run time.
A thorough cooling study is really worth the time and hassle.
Hope this helps,
Regards,
Gilles
http://contrails.free.fr
Message 5
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| Subject: | Re: Perfect cooling diffuser |
We have a 914 and usually use a blanking plate over the oil radiator, about
1/4 blanked off in the summer and 3/4 blanked off in the winter.
This works well but a varible flap would be better, what designs do you guys
use and are any approved by the PFA ?
Mike Clews
G-OMIK
----- Original Message -----
From: "Gilles Thesee" <Gilles.Thesee@ac-grenoble.fr>
Sent: Saturday, December 02, 2006 1:20 PM
Subject: Re: Europa-List: Perfect cooling diffuser
<Gilles.Thesee@ac-grenoble.fr>
Duncan,
>
> What is your ratio(s) of inlet area to outlet area?
What really matters is the ration of outlet area to RADIATOR area. As
already stated on Contrails, too large an opening won't flow more air
than a correctly proportioned one, since it is the radiator that governs
the flow in the duct.
It may help to figure the radiator duct system as a duct with 3 valves
in series. The middle valve is the radiator. As it is partly closed,
opening the other valves more than necessary won't change the overall
throughput.
There is no use opening the outlet more than about 1 time the radiator
frontal area, you would only add drag without increasing air flow
through the radiator. Drag decreases as you reduce outlet area by means
of the cowl flap. In cruise, outlet area should be smaller than the
inlet area to achieve minimum drag. It is advisable to construct the
adjustable cowl flap with a range of openings from 1 time the radiator
area to near zero (power descent on a cold day).
In our setup, inlet area is 25% of the radiator frontal area, whereas
exit cowl flaps can be adjusted from 70% to 0% of the radiator area (410
cm). We currently cruise with flaps adjusted to 18% of the radiator
area, or less on cold days. On summer hot days, best cruise (75% power)
is with the exit adjusted at about 28% radiator area. Of course we open
more in a prolonged climb.
During flight tests I installed a data logging system to check adequacy
of the pressures and temperatures.
Adjusting CHT and oil temps to within 5C of desired temperatures is a
breeze, and we found no special limitations concerning ground run time.
A thorough cooling study is really worth the time and hassle.
Hope this helps,
Regards,
Gilles
http://contrails.free.fr
Message 6
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| Subject: | Re: Perfect cooling diffuser |
Hi Duncan!
The rad face area is 9x12" so 108 sq in. Inlet area is 34 sq in so ratio
..31. Outlet area is
4 x 12" so 48 sq in so ratio .44.
The idea behind the bell shape is as the air enters the duct and begins to
slow down,
it can follow a tighter radius without separating. When the air enters the
rad, it is
straightened again and then accelerated back to free stream in the
converging duct.
I think I still have some excess cooling capacity so I think this rad/duct
combo is probably
good for 150 hp. The guy in San Diego building the 200 hp supercharged
Europa is pretty much copying my cooling system so it will be interesting!
I have a 2
row dual pass aluminum rad on my setup. I suggested going to a 3 row dual
pass brass for his
supercharged setup.
Glenn
>From: "Duncan & Ami McFadyean" <ami@mcfadyean.freeserve.co.uk>
>To: <europa-list@matronics.com>
>Subject: Re: Europa-List: Perfect cooling diffuser
>Date: Sat, 2 Dec 2006 08:22:55 -0000
>
><ami@mcfadyean.freeserve.co.uk>
>
>Glen,
>What is your ratio(s) of inlet area to outlet area?
>I realise that it is adjustable.
>
>Duncan Mcf.
>----- Original Message ----- From: "GLENN CROWDER" <gcrowder2@hotmail.com>
>To: <europa-list@matronics.com>
>Sent: Friday, December 01, 2006 10:28 PM
>Subject: Europa-List: Perfect cooling diffuser
>
>
>>I created an almost exact copy of the Kuchemann/Weber perfect
>>diffuser on my Europa to try and keep my 135 hp EA81 cool.
>>All cooling on the EA81 is thru the water jacket and none is done by air
>>cooling on the 912/914 so the ducting has to be good.
>> Both cooling in the air and ground are very good. I can run the
>>engine as long as desired at 1800 rpm on the ground without over
>>heating even on a 100 F day. In the air, water temps to go 200 F
>>after a 2 minute climbout then drop back to 185 for cruise.
>> There is a 12" long diffuser section that expands like a bell to
>>slow and pressurize the incoming air. After the rad, there is a
>>converging duct that accelerates the hot air back to free stream.
>> There also is a pull up cowl flap inside the converging section
>>that allows most of the incoming air to be shut off under cruise
>>conditions, adding 10 mph by cutting the flow and associated
>>drag when its not needed. Works great!
>>
>> Glenn
>>
>>_________________________________________________________________
>>View Athlete's Collections with Live Search
>>http://sportmaps.live.com/index.html?source=hmemailtaglinenov06&FORM=MGAC01
>>
>
>
_________________________________________________________________
Get the latest Windows Live Messenger 8.1 Beta version.Join now.
http://ideas.live.com
Message 7
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| Subject: | Re: Perfect cooling diffuser |
Gilles,
This is the forum that I like most.
Average of the Europa builders have Rotax engines and the radiator (234 cm2)
and ugly cowling (underside) are part of the kit. Those who personalise
their build with other engines or modifications look forward to problems for
eligibility in the different countries in Europe. So as Remy Guerner once
said: I present my airplane for control without cowlings. But to the point
now: Your radiator is 410 cm2 and Glenn has 685 cm2. I am convinced that
your investigation and theoretical statement is correct. Why don't dare we
tell that the original radiator for EUPA is undermeasured and the cowling
design is a misfit for all those who are building following the manual?
Shall I tell you that in France the G.D.A.C. don't approve the build in of
the digitrak wingleveler because the kit is not that one who was eligible
for their administration! I was surprised to see Glenns photographs because
they show nearly what I realised and therefore encourage me to continue as
well as your technical support. But as I said already: I didn't invent the
wheel, unfortunately, and what I am doing at the moment is not finished and
tested enough, so when my cowl flap will be nearly perfect I will give you
more feadback of the results.
Karel Vranken, F-PKRL # 447 XS Monowheel Rotax 912ULS Airmaster CSU
----- Original Message -----
From: "Gilles Thesee" <Gilles.Thesee@ac-grenoble.fr>
Sent: Saturday, December 02, 2006 2:20 PM
Subject: Re: Europa-List: Perfect cooling diffuser
> <Gilles.Thesee@ac-grenoble.fr>
>
> Duncan,
>
>>
>> What is your ratio(s) of inlet area to outlet area?
>
> What really matters is the ration of outlet area to RADIATOR area. As
> already stated on Contrails, too large an opening won't flow more air than
> a correctly proportioned one, since it is the radiator that governs the
> flow in the duct.
> It may help to figure the radiator duct system as a duct with 3 valves in
> series. The middle valve is the radiator. As it is partly closed, opening
> the other valves more than necessary won't change the overall throughput.
> There is no use opening the outlet more than about 1 time the radiator
> frontal area, you would only add drag without increasing air flow through
> the radiator. Drag decreases as you reduce outlet area by means of the
> cowl flap. In cruise, outlet area should be smaller than the inlet area to
> achieve minimum drag. It is advisable to construct the adjustable cowl
> flap with a range of openings from 1 time the radiator area to near zero
> (power descent on a cold day).
>
> In our setup, inlet area is 25% of the radiator frontal area, whereas exit
> cowl flaps can be adjusted from 70% to 0% of the radiator area (410 cm).
> We currently cruise with flaps adjusted to 18% of the radiator area, or
> less on cold days. On summer hot days, best cruise (75% power) is with the
> exit adjusted at about 28% radiator area. Of course we open more in a
> prolonged climb.
>
> During flight tests I installed a data logging system to check adequacy of
> the pressures and temperatures.
>
> Adjusting CHT and oil temps to within 5C of desired temperatures is a
> breeze, and we found no special limitations concerning ground run time. A
> thorough cooling study is really worth the time and hassle.
>
> Hope this helps,
> Regards,
> Gilles
> http://contrails.free.fr
>
>
>
Message 8
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Europa Owners/Builders,
Flight Crafters has over the years accumulated a number of Europa parts.
With Europa sales becoming somewhat limited in North America and
storage space at a preminum, we will make these parts available at near
giveaway costs
Parts range from small hardware items to control surface foam cores,
cockpit modules, fuel tanks, trailer and lower fuselage half. Please
contact me offline or call for additional information.
We are still providing builder assistance for Europa's and will continue
to do so.
Bob Berube
Flight Crafters
5048 Airport Rd.
Zephyrhills, FL. 33542
813 779-1156
Cell 813 695-1120
Message 9
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Bob,
Would be interested in a specific list of parts available if you have
one.
Cheers,
Tim
Monowheel Classic #292
Rotax 912S
Airmaster Prop.
Tim Ward
12 Waiwetu Street,
Fendalton,
Christchurch, 8052
New Zealand
Ph +64 3 3515166
Mobile 021 0640221
ward.t@xtra.co.nz
Message 10
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| Subject: | Re: Europa Parts |
Bob Berube
Why not post the list on this site for all to have a look?
JR (Bob) Gowing UK Kit 327 in Oz
Do not archive
----- Original Message -----
From: Bob
To: europa-list@matronics.com
Sent: Sunday, December 03, 2006 10:34 AM
Subject: Europa-List: Europa Parts
Europa Owners/Builders,
Flight Crafters has over the years accumulated a number of Europa
parts. With Europa sales becoming somewhat limited in North America and
storage space at a preminum, we will make these parts available at near
giveaway costs
Parts range from small hardware items to control surface foam cores,
cockpit modules, fuel tanks, trailer and lower fuselage half. Please
contact me offline or call for additional information.
We are still providing builder assistance for Europa's and will
continue to do so.
Bob Berube
Flight Crafters
5048 Airport Rd.
Zephyrhills, FL. 33542
813 779-1156
Cell 813 695-1120
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1/11/06
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