Today's Message Index:
----------------------
1. 06:52 AM - Re: Europa-List Digest: 3 Msgs - 02/19/21 (Gary Leinberger)
2. 07:57 AM - Re: Re: Europa-List Digest: 3 Msgs - 02/19/21 (Christoph Both)
3. 09:25 AM - Re: Wheel fairings (budyerly@msn.com)
Message 1
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| Subject: | RE: Europa-List Digest: 3 Msgs - 02/19/21 |
Yes - I have the Airmaster prop - and the High-top seems to be faster than the
stock configuration (I have talked with other Europa builders with the High-top
and they agree). We built the kit for the High-top ourselves - more frontal
area but faster? Streamlining is still a black art. But it sure is more comfortable
and feels much more roomy - in the stock Europa I feel like I am driving
a 1957 Porsche Speedster with the top up. I also fly a Mooney M20 (1968) and
even though the width of the cockpits is exactly the same (44 inches with the
cutouts at shoulder height) the Mooney feels claustrophobic. Even the Boss (my
wife) would rather travel in the Europa. In the Mooney she does her co-piloting
from the back seat.
Gary Leinberger Europa High-top
912S, A237
-----Original Message-----
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matronics.com>
On Behalf Of Europa-List Digest Server
Sent: Saturday, February 20, 2021 2:35 AM
Subject: Europa-List Digest: 3 Msgs - 02/19/21
CAUTION: This email originated from outside of Millersville. Do not click links
or open attachments unless you recognize the sender and know the content is safe.
*
=================================================
Online Versions of Today's List Digest Archive =================================================
Today's complete Europa-List Digest can also be found in either of the two Web
Links listed below. The .html file includes the Digest formatted in HTML for
viewing with a web browser and features Hyperlinked Indexes and Message Navigation.
The .txt file includes the plain ASCII version of the Europa-List Digest
and can be viewed with a generic text editor such as Notepad or with a web browser.
HTML Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 21-02-19&Archive=Europa
Text Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 21-02-19&Archive=Europa
===============================================
EMail Version of Today's List Digest Archive ===============================================
----------------------------------------------------------
Europa-List Digest Archive
---
Total Messages Posted Fri 02/19/21: 3
----------------------------------------------------------
Today's Message Index:
----------------------
1. 04:48 AM - Re: Wheel fairings (arwel pritchard)
2. 06:55 AM - Re: Europa-List Digest: 1 Msgs - 02/18/21 (Gary Leinberger)
3. 07:37 AM - Re: Re: Europa-List Digest: 1 Msgs - 02/18/21 (Pete)
________________________________ Message 1 _____________________________________
Time: 04:48:05 AM PST US
Subject: Re: Europa-List: Wheel fairings
From: arwel pritchard <arwel.pritchard@powercom.ltd.uk>
Gents
I have the speed kit fitted to my XS but I dont have any transitions to the fuselage
or wheel fairings. Are these available from Europa or are they something
each builder makes for himself?
Cheers
Arwel
On 18/02/2021 10:32, Kevin wrote:
>
> Frans,
> Reading your improving nose wheel fairing , did you achieve good results ?
> Did you make more than one ? I am currently in need of a nose wheel
> fairing ,
Also need a full set of leg fairings , including transitioning to fuselage and
main wheel pants / wheel fairing ..
> Im pressed for time so cant make my own at moment , dont see point of
> making
fresh moulds when , improved ones are sitting on a bench somewhere ..
> Regards
> Kevin
>
> Sent from my iPad
>
>> On 19 Aug 2012, at 23:38, Frans Veldman <frans@privatepilots.nl> wrote:
>>
>>
>>> On 08/19/2012 10:41 PM, craig wrote:
>>> --> Europa-List message posted by: "craig"<craigb@onthenet.com.au>
>>>
>>> Frans, could you elaborate on the "correct length would be shorter"
>>> wouldn't the longer shallower transition Create less drag and thus
>>> make your longer fairing more efficient.
>> There is also something like skin drag. More surface creates more
>> drag. So there
is an optimum somewhere: for a 2D fairing (like for a strut or a wheel leg) the
optimal width to length ratio would be 1:3.7, with the widest point at about
30% of the length. For a 3D fairing things get a bit more complicated. Shorter
carries a higher penalty than longer, so if in doubt just make it longer.
>>
>> Frans
>>
>>
>>
>>
>
>
________________________________ Message 2 _____________________________________
Time: 06:55:30 AM PST US
From: Gary Leinberger <Gary.Leinberger@millersville.edu>
Subject: Europa-List: RE: Europa-List Digest: 1 Msgs - 02/18/21
I have wheel pants and fairings (the speed kit) on my Europa Tri-gear High-top
- speed kit built by Bud Yerly. I went from 119 kts to 137 knots (at 1000 ft full
throttle) after putting them on. Talk to Bud - I don't know if he still makes them
but I am very satisfied - and they are easy to work with - one bolt, two screws
and a pin and they are off. After 400 hrs. and 8.5 years only slightly dinged
up (dumb tax for not being more careful rolling the plane out and hit a
door guide in the hanger).
Gary Leinberger
Europa High-top 912 S
-----Original Message-----
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matronics.com>
On Behalf Of Europa-List Digest Server
Sent: Friday, February 19, 2021 2:35 AM
Subject: Europa-List Digest: 1 Msgs - 02/18/21
CAUTION: This email originated from outside of Millersville. Do not click links
or open attachments unless you recognize the sender and know the content is safe.
*
================================================
Online Versions of Today's List Digest Archive ================================================
Today's complete Europa-List Digest can also be found in either of the two Web
Links listed below. The .html file includes the Digest formatted in HTML for
viewing with a web browser and features Hyperlinked Indexes and Message Navigation.
The .txt file includes the plain ASCII version of the Europa-List Digest and can
be viewed with a generic text editor such as Notepad or with a web browser.
HTML Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 21-02-18&Archive=Europa
Text Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 21-02-18&Archive=Europa
==============================================
EMail Version of Today's List Digest Archive ==============================================
----------------------------------------------------------
Europa-List Digest Archive
---
Total Messages Posted Thu 02/18/21: 1
----------------------------------------------------------
Today's Message Index:
----------------------
1. 02:33 AM - Re: Wheel fairings (Kevin)
________________________________ Message 1 _____________________________________
Time: 02:33:02 AM PST US
From: Kevin <kjburns@btinternet.com>
Subject: Re: Europa-List: Wheel fairings
Frans,
Reading your improving nose wheel fairing , did you achieve good results ?
Did you make more than one ? I am currently in need of a nose wheel fairing , Also
need a full set of leg fairings , including transitioning to fuselage and
main wheel pants / wheel fairing ..
Im pressed for time so cant make my own at moment , dont see point of making fresh
moulds when , improved ones are sitting on a bench somewhere ..
Regards
Kevin
Sent from my iPad
> On 19 Aug 2012, at 23:38, Frans Veldman <frans@privatepilots.nl> wrote:
>
>
>> On 08/19/2012 10:41 PM, craig wrote:
>> --> Europa-List message posted by: "craig"<craigb@onthenet.com.au>
>>
>> Frans, could you elaborate on the "correct length would be shorter"
>> wouldn't the longer shallower transition Create less drag and thus
>> make your longer fairing more efficient.
>
> There is also something like skin drag. More surface creates more
> drag. So there
is an optimum somewhere: for a 2D fairing (like for a strut or a wheel leg) the
optimal width to length ratio would be 1:3.7, with the widest point at about
30% of the length. For a 3D fairing things get a bit more complicated. Shorter
carries a higher penalty than longer, so if in doubt just make it longer.
>
> Frans
>
>
________________________________ Message 3 _____________________________________
Time: 07:37:46 AM PST US
From: Pete <peterz@zutrasoft.com>
Subject: Re: Europa-List: RE: Europa-List Digest: 1 Msgs - 02/18/21
Impressive Gary! CS prop?
Cheers and thx,
Pete
Mono classic
> On Feb 19, 2021, at 10:11 AM, Gary Leinberger
> <Gary.Leinberger@millersville.edu>
wrote:
>
>
> I have wheel pants and fairings (the speed kit) on my Europa Tri-gear
> High-top
- speed kit built by Bud Yerly. I went from 119 kts to 137 knots (at 1000 ft full
throttle) after putting them on. Talk to Bud - I don't know if he still makes
them but I am very satisfied - and they are easy to work with - one bolt, two
screws and a pin and they are off. After 400 hrs. and 8.5 years only slightly
dinged up (dumb tax for not being more careful rolling the plane out and hit
a door guide in the hanger).
>
> Gary Leinberger
> Europa High-top 912 S
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com
> <owner-europa-list-server@matronics.com>
On Behalf Of Europa-List Digest Server
> Sent: Friday, February 19, 2021 2:35 AM
> To: Europa-List Digest List <europa-list-digest@matronics.com>
> Subject: Europa-List Digest: 1 Msgs - 02/18/21
>
> CAUTION: This email originated from outside of Millersville. Do not
> click links
or open attachments unless you recognize the sender and know the content is safe.
>
>
> *
>
> ================================================
> Online Versions of Today's List Digest Archive
> ================================================
>
> Today's complete Europa-List Digest can also be found in either of the
> two Web
Links listed below. The .html file includes the Digest formatted in HTML for viewing
with a web browser and features Hyperlinked Indexes and Message Navigation.
The .txt file includes the plain ASCII version of the Europa-List Digest and can
be viewed with a generic text editor such as Notepad or with a web browser.
>
> HTML Version:
>
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=html&C
> hapter 21-02-18&Archive=Europa
>
> Text Version:
>
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Ch
> apter 21-02-18&Archive=Europa
>
>
> ==============================================
> EMail Version of Today's List Digest Archive
> ==============================================
>
>
> ----------------------------------------------------------
> Europa-List Digest Archive
> ---
> Total Messages Posted Thu 02/18/21: 1
> ----------------------------------------------------------
>
>
> Today's Message Index:
> ----------------------
>
> 1. 02:33 AM - Re: Wheel fairings (Kevin)
>
>
> ________________________________ Message 1
> _____________________________________
>
>
> Time: 02:33:02 AM PST US
> From: Kevin <kjburns@btinternet.com>
> Subject: Re: Europa-List: Wheel fairings
>
>
> Frans,
> Reading your improving nose wheel fairing , did you achieve good results ?
> Did you make more than one ? I am currently in need of a nose wheel
> fairing ,
Also need a full set of leg fairings , including transitioning to fuselage and
main wheel pants / wheel fairing ..
> Im pressed for time so cant make my own at moment , dont see point of
> making
fresh moulds when , improved ones are sitting on a bench somewhere ..
> Regards
> Kevin
>
> Sent from my iPad
>
>>> On 19 Aug 2012, at 23:38, Frans Veldman <frans@privatepilots.nl> wrote:
>>>
>>>
>>>> On 08/19/2012 10:41 PM, craig wrote:
>>> --> Europa-List message posted by: "craig"<craigb@onthenet.com.au>
>>>
>>> Frans, could you elaborate on the "correct length would be shorter"
>>> wouldn't the longer shallower transition Create less drag and thus
>>> make your longer fairing more efficient.
>>
>> There is also something like skin drag. More surface creates more
>> drag. So there
> is an optimum somewhere: for a 2D fairing (like for a strut or a wheel
> leg) the
optimal width to length ratio would be 1:3.7, with the widest point at about 30%
of the length. For a 3D fairing things get a bit more complicated. Shorter carries
a higher penalty than longer, so if in doubt just make it longer.
>>
>> Frans
>>
>>
>>
>>
>
>
Message 2
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| Subject: | Re: RE: Europa-List Digest: 3 Msgs - 02/19/21 |
XS cowling or Classic cowling?
Christoph Both
C-GPEL
Wolfville, Nova Scotia
Sent from my iPhone
> On Feb 20, 2021, at 10:52, Gary Leinberger <Gary.Leinberger@millersville.edu>
wrote:
>
> CAUTION: This email comes from outside Acadia. Verify the sender and use caution
with any requests, links or attachments.
>
>
> Yes - I have the Airmaster prop - and the High-top seems to be faster than the
stock configuration (I have talked with other Europa builders with the High-top
and they agree). We built the kit for the High-top ourselves - more frontal
area but faster? Streamlining is still a black art. But it sure is more comfortable
and feels much more roomy - in the stock Europa I feel like I am driving
a 1957 Porsche Speedster with the top up. I also fly a Mooney M20 (1968) and
even though the width of the cockpits is exactly the same (44 inches with the
cutouts at shoulder height) the Mooney feels claustrophobic. Even the Boss (my
wife) would rather travel in the Europa. In the Mooney she does her co-piloting
from the back seat.
>
> Gary Leinberger Europa High-top
> 912S, A237
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com <owner-europa-list-server@matronics.com>
On Behalf Of Europa-List Digest Server
> Sent: Saturday, February 20, 2021 2:35 AM
> To: Europa-List Digest List <europa-list-digest@matronics.com>
> Subject: Europa-List Digest: 3 Msgs - 02/19/21
>
> CAUTION: This email originated from outside of Millersville. Do not click links
or open attachments unless you recognize the sender and know the content is
safe.
>
>
> *
>
> =================================================
> Online Versions of Today's List Digest Archive =================================================
>
> Today's complete Europa-List Digest can also be found in either of the two Web
Links listed below. The .html file includes the Digest formatted in HTML for
viewing with a web browser and features Hyperlinked Indexes and Message Navigation.
The .txt file includes the plain ASCII version of the Europa-List Digest
and can be viewed with a generic text editor such as Notepad or with a web
browser.
>
> HTML Version:
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 21-02-19&Archive=Europa
>
> Text Version:
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 21-02-19&Archive=Europa
>
>
> ===============================================
> EMail Version of Today's List Digest Archive ===============================================
>
>
> ----------------------------------------------------------
> Europa-List Digest Archive
> ---
> Total Messages Posted Fri 02/19/21: 3
> ----------------------------------------------------------
>
>
> Today's Message Index:
> ----------------------
>
> 1. 04:48 AM - Re: Wheel fairings (arwel pritchard)
> 2. 06:55 AM - Re: Europa-List Digest: 1 Msgs - 02/18/21 (Gary Leinberger)
> 3. 07:37 AM - Re: Re: Europa-List Digest: 1 Msgs - 02/18/21 (Pete)
>
>
>
> ________________________________ Message 1 _____________________________________
>
>
> Time: 04:48:05 AM PST US
> Subject: Re: Europa-List: Wheel fairings
> From: arwel pritchard <arwel.pritchard@powercom.ltd.uk>
>
>
> Gents
>
> I have the speed kit fitted to my XS but I dont have any transitions to the fuselage
or wheel fairings. Are these available from Europa or are they something
each builder makes for himself?
>
>
> Cheers
>
>
> Arwel
>
>> On 18/02/2021 10:32, Kevin wrote:
>>
>> Frans,
>> Reading your improving nose wheel fairing , did you achieve good results ?
>> Did you make more than one ? I am currently in need of a nose wheel
>> fairing ,
> Also need a full set of leg fairings , including transitioning to fuselage and
main wheel pants / wheel fairing ..
>> Im pressed for time so cant make my own at moment , dont see point of
>> making
> fresh moulds when , improved ones are sitting on a bench somewhere ..
>> Regards
>> Kevin
>>
>> Sent from my iPad
>>
>>>> On 19 Aug 2012, at 23:38, Frans Veldman <frans@privatepilots.nl> wrote:
>>>
>>>
>>>> On 08/19/2012 10:41 PM, craig wrote:
>>>> --> Europa-List message posted by: "craig"<craigb@onthenet.com.au>
>>>>
>>>> Frans, could you elaborate on the "correct length would be shorter"
>>>> wouldn't the longer shallower transition Create less drag and thus
>>>> make your longer fairing more efficient.
>>> There is also something like skin drag. More surface creates more
>>> drag. So there
> is an optimum somewhere: for a 2D fairing (like for a strut or a wheel leg) the
optimal width to length ratio would be 1:3.7, with the widest point at about
30% of the length. For a 3D fairing things get a bit more complicated. Shorter
carries a higher penalty than longer, so if in doubt just make it longer.
>>>
>>> Frans
>>>
>>>
>>>
>>>
>>
>>
>
>
> ________________________________ Message 2 _____________________________________
>
>
> Time: 06:55:30 AM PST US
> From: Gary Leinberger <Gary.Leinberger@millersville.edu>
> Subject: Europa-List: RE: Europa-List Digest: 1 Msgs - 02/18/21
>
>
> I have wheel pants and fairings (the speed kit) on my Europa Tri-gear High-top
> - speed kit built by Bud Yerly. I went from 119 kts to 137 knots (at 1000 ft
full
> throttle) after putting them on. Talk to Bud - I don't know if he still makes
them but I am very satisfied - and they are easy to work with - one bolt, two
screws and a pin and they are off. After 400 hrs. and 8.5 years only slightly
dinged up (dumb tax for not being more careful rolling the plane out and hit
a door guide in the hanger).
>
> Gary Leinberger
> Europa High-top 912 S
>
> -----Original Message-----
> From: owner-europa-list-server@matronics.com <owner-europa-list-server@matronics.com>
> On Behalf Of Europa-List Digest Server
> Sent: Friday, February 19, 2021 2:35 AM
> Subject: Europa-List Digest: 1 Msgs - 02/18/21
>
> CAUTION: This email originated from outside of Millersville. Do not click links
or open attachments unless you recognize the sender and know the content is
safe.
>
>
> *
>
> ================================================
> Online Versions of Today's List Digest Archive ================================================
>
> Today's complete Europa-List Digest can also be found in either of the two Web
Links listed below. The .html file includes the Digest formatted in HTML for
viewing with a web browser and features Hyperlinked Indexes and Message Navigation.
> The .txt file includes the plain ASCII version of the Europa-List Digest and
can be viewed with a generic text editor such as Notepad or with a web browser.
>
> HTML Version:
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 21-02-18&Archive=Europa
>
> Text Version:
>
> http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 21-02-18&Archive=Europa
>
>
> ==============================================
> EMail Version of Today's List Digest Archive ==============================================
>
>
> ----------------------------------------------------------
> Europa-List Digest Archive
> ---
> Total Messages Posted Thu 02/18/21: 1
> ----------------------------------------------------------
>
>
> Today's Message Index:
> ----------------------
>
> 1. 02:33 AM - Re: Wheel fairings (Kevin)
>
>
> ________________________________ Message 1 _____________________________________
>
>
> Time: 02:33:02 AM PST US
> From: Kevin <kjburns@btinternet.com>
> Subject: Re: Europa-List: Wheel fairings
>
>
> Frans,
> Reading your improving nose wheel fairing , did you achieve good results ?
> Did you make more than one ? I am currently in need of a nose wheel fairing ,
Also need a full set of leg fairings , including transitioning to fuselage and
main wheel pants / wheel fairing ..
> Im pressed for time so cant make my own at moment , dont see point of making
fresh moulds when , improved ones are sitting on a bench somewhere ..
> Regards
> Kevin
>
> Sent from my iPad
>
>> On 19 Aug 2012, at 23:38, Frans Veldman <frans@privatepilots.nl> wrote:
>>
>>
>>>> On 08/19/2012 10:41 PM, craig wrote:
>>> --> Europa-List message posted by: "craig"<craigb@onthenet.com.au>
>>>
>>> Frans, could you elaborate on the "correct length would be shorter"
>>> wouldn't the longer shallower transition Create less drag and thus
>>> make your longer fairing more efficient.
>>
>> There is also something like skin drag. More surface creates more
>> drag. So there
> is an optimum somewhere: for a 2D fairing (like for a strut or a wheel leg) the
optimal width to length ratio would be 1:3.7, with the widest point at about
30% of the length. For a 3D fairing things get a bit more complicated. Shorter
carries a higher penalty than longer, so if in doubt just make it longer.
>>
>> Frans
>>
>>
>
>
> ________________________________ Message 3 _____________________________________
>
>
> Time: 07:37:46 AM PST US
> From: Pete <peterz@zutrasoft.com>
> Subject: Re: Europa-List: RE: Europa-List Digest: 1 Msgs - 02/18/21
>
>
> Impressive Gary! CS prop?
> Cheers and thx,
> Pete
> Mono classic
>
>> On Feb 19, 2021, at 10:11 AM, Gary Leinberger
>> <Gary.Leinberger@millersville.edu>
> wrote:
>>
>>
>> I have wheel pants and fairings (the speed kit) on my Europa Tri-gear
>> High-top
> - speed kit built by Bud Yerly. I went from 119 kts to 137 knots (at 1000 ft
full throttle) after putting them on. Talk to Bud - I don't know if he still makes
them but I am very satisfied - and they are easy to work with - one bolt,
two screws and a pin and they are off. After 400 hrs. and 8.5 years only slightly
dinged up (dumb tax for not being more careful rolling the plane out and
hit a door guide in the hanger).
>>
>> Gary Leinberger
>> Europa High-top 912 S
>>
>> -----Original Message-----
>> From: owner-europa-list-server@matronics.com
>> <owner-europa-list-server@matronics.com>
> On Behalf Of Europa-List Digest Server
>> Sent: Friday, February 19, 2021 2:35 AM
>> To: Europa-List Digest List <europa-list-digest@matronics.com>
>> Subject: Europa-List Digest: 1 Msgs - 02/18/21
>>
>> CAUTION: This email originated from outside of Millersville. Do not
>> click links
> or open attachments unless you recognize the sender and know the content is safe.
>>
>>
>> *
>>
>> ================================================
>> Online Versions of Today's List Digest Archive
>> ================================================
>>
>> Today's complete Europa-List Digest can also be found in either of the
>> two Web
> Links listed below. The .html file includes the Digest formatted in HTML for
viewing with a web browser and features Hyperlinked Indexes and Message Navigation.
> The .txt file includes the plain ASCII version of the Europa-List Digest and
can be viewed with a generic text editor such as Notepad or with a web browser.
>>
>> HTML Version:
>>
>>
>> http://www.matronics.com/digest/digestview.php?Style=82701&View=html&C
>> hapter 21-02-18&Archive=Europa
>>
>> Text Version:
>>
>>
>> http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Ch
>> apter 21-02-18&Archive=Europa
>>
>>
>> ==============================================
>> EMail Version of Today's List Digest Archive
>> ==============================================
>>
>>
>> ----------------------------------------------------------
>> Europa-List Digest Archive
>> ---
>> Total Messages Posted Thu 02/18/21: 1
>> ----------------------------------------------------------
>>
>>
>> Today's Message Index:
>> ----------------------
>>
>> 1. 02:33 AM - Re: Wheel fairings (Kevin)
>>
>>
>>
>> ________________________________ Message 1
>> _____________________________________
>>
>>
>> Time: 02:33:02 AM PST US
>> From: Kevin <kjburns@btinternet.com>
>> Subject: Re: Europa-List: Wheel fairings
>>
>>
>> Frans,
>> Reading your improving nose wheel fairing , did you achieve good results ?
>> Did you make more than one ? I am currently in need of a nose wheel
>> fairing ,
> Also need a full set of leg fairings , including transitioning to fuselage and
main wheel pants / wheel fairing ..
>> Im pressed for time so cant make my own at moment , dont see point of
>> making
> fresh moulds when , improved ones are sitting on a bench somewhere ..
>> Regards
>> Kevin
>>
>> Sent from my iPad
>>
>>>> On 19 Aug 2012, at 23:38, Frans Veldman <frans@privatepilots.nl> wrote:
>>>>
>>>>
>>>>> On 08/19/2012 10:41 PM, craig wrote:
>>>> --> Europa-List message posted by: "craig"<craigb@onthenet.com.au>
>>>>
>>>> Frans, could you elaborate on the "correct length would be shorter"
>>>> wouldn't the longer shallower transition Create less drag and thus
>>>> make your longer fairing more efficient.
>>>
>>> There is also something like skin drag. More surface creates more
>>> drag. So there
>> is an optimum somewhere: for a 2D fairing (like for a strut or a wheel
>> leg) the
> optimal width to length ratio would be 1:3.7, with the widest point at about
30% of the length. For a 3D fairing things get a bit more complicated. Shorter
carries a higher penalty than longer, so if in doubt just make it longer.
>>>
>>> Frans
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>
>
>
>
>
>
>
Message 3
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|
| Subject: | Re: Wheel fairings |
For those of you who missed extensive discussions in the past on cleaning up the
Europa to get the performance you desire, lets reflect.
In some previous writings I gave a summary of projects to improve the Europa Trigear
speed kit and how I make my custom speed kits. See attachment below. I
also summarized how I get maximum potential out of my own and customers aircraft.
Again, it is somewhat detailed.
For those of you who expect to just clip on a bit of fiberglass and some rattle
can paint and get huge jumps in performance, you will be sadly disappointed.
Aerodynamic efficiency comes from hours of work, fairing, study and testing.
Gary Leinberger has commented recently and to add to the discussion points I
have the following comments on his N388SG:
1. The aircraft is a high top, wide body, fully IFR, full leather interior, dual
autopilot, 912S equipped, Airmaster AP332 with my full Custom Flight Speed Kit
(including hand done fairing) but with the wheel pants set higher than my 1.5
inch standard height for some grass strip operations. Empty weight was just
over 1000 pounds.
2. The paint job is very smooth and even the exterior lighting is as small and
clean as was available in 2006. The cooling drag improved somewhat following
my Cooling 101 guidance.
3. We tried using an oil thermostat but in the hot Pennsylvania summers it was
not allowing sufficient cooling. It was removed and a simple air dam butterfly
was used to block oil/glycol airflow in the duct during taxi out and winter
time cruise. I also has the hot water carb heat on full time.
4. The aircraft is well maintained, kept clean and polished, and its engine well
serviced and repaired of any discrepancy.
Performance is more than adequate for a 912S. Especially considering its weight.
I have found at approximately 6500 MSL at 5000 RPM and about 24 inches MP
the plane was flying at 126KTAS, 5.4 GPH, without any leaning or modifications
to the Bing carbys such as the HAC Man. If the HAC Man or similar was used we
would get a bit of a boost. At high cruise at 5500RPM, and 26+ inches the aircraft
edged up to just below 140 KTAS at 2500MSL and due to running a bit rich
only about 135 at 6500. Above 7500 MSL one expects that 75% power can no longer
be maintained. It has a somewhat inefficient carb air box arrangement where
about 1 of Hg is lost.
What Garys aircraft has is an aircraft built with much attention to detail. It
is well rigged/trimmed and frankly fussed over to keep it in top shape. His
learning curve to maintain that has been quite high.
The 914/Airmaster equipped trigear aircraft benefit from turbocharging and cruise
at or near 10,000 MSL is a comfortable 140 to 145 KTAS depending on weight
and attention to detail following my speed kit, trimming, and cleanup guidance.
This guidance was not discovered by me or my clients. It is tried and true research
and development carried out through wind tunnel tests years ago. If you
want to make a fixed gear airplane cleaner you must pay attention to details:
1. Seal the gaps in the wing to root fairing. Tape is ugly, sticky and messy.
Learn how to do it with gap sealing filler strips of weatherproof foam tapes
and rigging and sealing is fast and repeatable.
2. Wheel pants alone do not add performance. Installation of a pant to be as low
as practicable and each transition from pant to leg to fuselage must be made
smooth and well faired. On my first LSA aircraft my original hack at my custom
speed kit increased speed by 17 knots and added only 8 pounds total. (40
extra hours of work though then paint on top of that.)
3. Cooling drag is a big deal. Most aircraft drag is from poor duct sealing and
flow control. Cooling 101 is my start on how to improve your cooling drag.
4. Trim is essential. Weight and balance should be near the center at about 60
inches. Too nose heavy and the stabilator will be creating a lot of downforce
and drag. Balance the aircraft. Roll and rudder trim is essential.. Engine
offset, proper wing incidence and trim tabs that are large enough to limit grossly
large deflections help. I have papers on my website on how I do trimming,
as well as on The Europa Club Website.
5. A clean smooth painted surface that is well polished will increase speed considerably.
6. Keep the engine at its full potential. If the engine is not running right or
compressions are dropping, fix it. If you have tinkered with the induction
system, and are seeing very low manifold pressure at full throttle (below 28 inches)
you have an inefficient inlet system. Mufflers create back pressure.
The Classic muffler has a bit too much and as a result the original 80 HP aircraft
suffer a bit. But since the Classic is lighter, one doesnt notice it as
much. The XS has the CKT exhaust which is lighter and has less backpressure.
7. A constant speed propeller will gain you additional cruise at a weight and cost
penalty. However, following the golden rule: If it adds weight and it must
increase performance, is definitely at play here, it is a performance and safety
enhancer.
8. Get the weight down. Weight is the main performance penalty to many very nicely
built aircraft. Old vacuum instruments, heavy gyros, non-solid state radios,
antiquated storm scope and navigation heads are no longer necessary or even
cost effective. The vacuum pump also robs horsepower from the engine. Old
heavy and draggy Whelen lights were high amperage units, and the wire was nearly
a pound a foot. Thats 12 unnecessary pounds with todays LED tip lights alone.
Super heavy (but comfortable) cushions decrease payload and are somewhat
easy to change out to our new fabrics and foams. Get rid of the golf cart batteries
and put in lighter gel cell batteries, or even consider Lithium ion type
batteries.
Following these basic rules is not easy or fast. Often it will require extensive
rebuild of a used or already built aircraft. But if you have an older aircraft,
and it is down for maintenance, tackle one or more of the above and in a
few years, the plane will be like a new aircraft. I just takes a few minutes
to review TheEuropaClub website to download more info and please look at the
references for more ideas.
Bud Yerly
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500762#500762
Attachments:
http://forums.matronics.com//files/custom_flight_speed_kit_installation_2020_152.pdf
http://forums.matronics.com//files/techniques_for_increasing_europa_performance_2020_394.pdf
http://forums.matronics.com//files/custom_flight_trimming_101_126.pdf
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