Today's Message Index:
----------------------
1. 06:18 AM - Induction cold air plenum (n7188u)
2. 06:56 AM - Re: Induction cold air plenum (Steve Ivell)
3. 07:01 AM - Re: Induction cold air plenum (n7188u)
4. 07:08 AM - Re: Induction cold air plenum (n7188u)
5. 07:37 AM - Re: Re: Induction cold air plenum (Steve Ivell)
6. 08:08 AM - Re: Induction cold air plenum (n7188u)
7. 10:54 AM - Naca Duct Size (daaza22)
8. 12:32 PM - Re: Naca Duct Size (timward)
9. 12:57 PM - Re: Induction cold air plenum (SPURPURA)
10. 01:32 PM - Re: Naca Duct Size (daaza22)
11. 01:47 PM - Re: Re: Naca Duct Size (timward)
12. 01:53 PM - Re: Induction cold air plenum (n7188u)
13. 03:22 PM - Re: Re: Induction cold air plenum (Bud Yerly)
14. 03:52 PM - FW: Re: Induction cold air plenum (Bud Yerly)
15. 05:25 PM - Re: Induction cold air plenum (budyerly@msn.com)
16. 06:54 PM - Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop (Area-51)
17. 09:58 PM - Re: Re: Naca Duct Size (timward)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Induction cold air plenum |
Dear Europa fans,
I am in the process of removing the two K&N cone style air filters that have served
me well for the first 100 hrs of my new Europa flying career and replacing
them with the induction cold air plenum (per strong recommendation from Bud!).
I have installed the plenum and I am in the process of making the NACA scoop. However,
I have found that the plenum is so high that it sits very close to the
cowling to the point that clearance at each of the plenum's forward corners is
minimal. The biggest issue I see is that the NACA scoop bottom sits bellow the
top surface of the plenum, very different from what the manual shows and certainly
doesn't look very efficient from an air flow perspective.
Just to check, are there two different plenums for the Classic and XS? Mine was
not in the kit and was donated by a nice person in the UK so not sure if I have
the right one. If the same them I guess it is what it is.
Thanks for the feedback,
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505263#505263
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Induction cold air plenum |
Hi Chris
Our Europa is an XS and there is a reasonable clearance such that the bottom of
the NACA scoopsits just above the filter. The gaps around the edges of the planum
are made up with rubber strip. Seems to work great. Our cowling came from
the factory with lines set into the gelcoat showing the position to cut out the
hole for the scoop......made life easy.
I guess your plenum could be fairly easily cut down to give you the required position.
So my idea would be to cut out a strip and glass the two halves back together.
I hope that make sense......and good luck.
Kind Regards
Steve Ivell
G-STES
XS 912s Hightop with a wobbly prop.
Mob: 07971 128842
E-mail: steveivell@pestproof.co.uk
-----Original Message-----
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matronics.com>
On Behalf Of n7188u
Sent: 15 December 2021 14:18
Subject: Europa-List: Induction cold air plenum
Dear Europa fans,
I am in the process of removing the two K&N cone style air filters that have served
me well for the first 100 hrs of my new Europa flying career and replacing
them with the induction cold air plenum (per strong recommendation from Bud!).
I have installed the plenum and I am in the process of making the NACA scoop. However,
I have found that the plenum is so high that it sits very close to the
cowling to the point that clearance at each of the plenum's forward corners is
minimal. The biggest issue I see is that the NACA scoop bottom sits bellow the
top surface of the plenum, very different from what the manual shows and certainly
doesn't look very efficient from an air flow perspective.
Just to check, are there two different plenums for the Classic and XS? Mine was
not in the kit and was donated by a nice person in the UK so not sure if I have
the right one. If the same them I guess it is what it is.
Thanks for the feedback,
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505263#505263
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Induction cold air plenum |
In my quest to seek the answer to my question I found a 2018 parts catalog from
Europa and they do list a plenum for the XS and the Classic.
Now the job is to determine which one do I have. Anyone out there with some basic
dimensions such as height of the plenum top from the carburetor bore centerline?
Thanks,
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505265#505265
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Induction cold air plenum |
Thanks for the reply Steve.
I have though of modifying the plenum but before I jump the gun I will see if I
can get any feedback on whether there are two different plenums and determine
if I have the wrong one. Some basic dimensions when possible would help (in case
there are indeed two different ones).
I can then entertain the idea of buying a new plenum or modifying this one (it's
composite and we have the knowledge of how to fix almost anything, right?).
I have invested quite a bit of time on this one (reinforcements, aluminum tubes
on the carb tubes) but I'll see when time comes to make a final decision.
For now I guess I will keep flying with my K&N cones.
Best Regards,
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505266#505266
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Induction cold air plenum |
I'm no expert but I'd say you could probably build a whole Europa quicker than
you can get a new plenum from the Europa Factory. Lol.........I'd be fixing the
one you have if I was you.
Kind Regards
Steve Ivell
Mob: 07971 128842
E-mail: steveivell@pestproof.co.uk
-----Original Message-----
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matronics.com>
On Behalf Of n7188u
Sent: 15 December 2021 15:08
Subject: Europa-List: Re: Induction cold air plenum
Thanks for the reply Steve.
I have though of modifying the plenum but before I jump the gun I will see if I
can get any feedback on whether there are two different plenums and determine
if I have the wrong one. Some basic dimensions when possible would help (in case
there are indeed two different ones).
I can then entertain the idea of buying a new plenum or modifying this one (it's
composite and we have the knowledge of how to fix almost anything, right?).
I have invested quite a bit of time on this one (reinforcements, aluminum tubes
on the carb tubes) but I'll see when time comes to make a final decision.
For now I guess I will keep flying with my K&N cones.
Best Regards,
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505266#505266
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Induction cold air plenum |
Probably true Steve. I am going to have it quoted though but I was looking at the
plenum and modifying it may not be too bad. At least I can try and I am in
no rush since my airplane, after all, is flying.
I was curious to see how much better the engine would run with this plenum.
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505268#505268
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
Hi everybody..
I am at the stage of fitting the firewall forward parts on my "Classic" build.
My question is what size should the Naca Duct for the cold air plenum be ?
Cheers Darren
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505269#505269
Message 8
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Naca Duct Size |
Hi Darren,
Measurements not given in the Mod 43 so I made my Naca Duct dimensions appro
ximately 100mm x 25mm. I also centred it on the top cowl, looks better and n
ot in the way of the coolant cap. See photo.
Cheers,
Tim
Sent from my iPad
Tim Ward
12 Waiwetu Street,
Fendalton,
Christchurch, 8052
New Zealand.
ward.t@xtra.co.nz
021 0640221
> On 16/12/2021, at 8:02 AM, daaza22 <royledarren@gmail.com> wrote:
>
om>
>
> Hi everybody..
> I am at the stage of fitting the firewall forward parts on my "Classic" b
uild.
> My question is what size should the Naca Duct for the cold air plenum be ?
>
> Cheers Darren
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=505269#505269
>
>
>
>
>
>
==========================
=========
==========================
=========
==========================
=========
==========================
=========
==========================
=========
>
>
>
Message 9
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Induction cold air plenum |
Thats the same as my XS plenum and fits pretty tight, just like everything else.
--------
N951EU - Tri-gear & 912ULS, N77EU- Mono & 914
I'D RATHER HAVE A BOTTLE IN FRONT OF ME THAN A FRONTAL LABOTAMY.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505271#505271
Message 10
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Naca Duct Size |
Tim
Thanks for the reply and photo .
sorry to be a pain but could you confirm
25mm for the narrow end
100mm for widest part
100mm long . ?
Darren
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505272#505272
Message 11
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Naca Duct Size |
Darren,
That is the opening into the plenum chamber approximately. If you are not in
a hurry I can measure it exactly next time at the hanger. The length is rea
lly up to you, however a gentle entrance to direct the airflow would be bett
er. Not too much pressure build up. See photo.
Cheers,
Tim
Sent from my iPad
Tim Ward
12 Waiwetu Street,
Fendalton,
Christchurch, 8052
New Zealand.
ward.t@xtra.co.nz
021 0640221
> On 16/12/2021, at 10:39 AM, daaza22 <royledarren@gmail.com> wrote:
>
om>
>
> Tim
> Thanks for the reply and photo .
> sorry to be a pain but could you confirm
> 25mm for the narrow end
> 100mm for widest part
> 100mm long . ?
>
> Darren
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=505272#505272
>
>
>
>
>
>
==========================
=========
==========================
=========
==========================
=========
==========================
=========
==========================
=========
>
>
>
Message 12
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Induction cold air plenum |
Thanks "Spurpura",
It's good to hear that mine is like other XSs. I am probably going to do some surgery
to this plenum anyway as I want to ensure enough clearance, smooth flow
from the scoop into the plenum and some protection against water ingress.
As a good airplane homebuilder friend of mine says: "There you go, adding another
two month of work to the project" :)
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505274#505274
Message 13
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Induction cold air plenum |
For those on the matronics list:
A good dimensional analysis of the =93NACA=94 duct for proper operation is
in the attached NACA document.
A ratio of 4 to one width to depth and a shape as shown in the NACA Ames R
esearch Center document 5121 attached gives the optimum shape of the inlet.
The NACA document has a lip that was changed over the series of tests but i
n reality just a flat thin inlet (thickness of the skin) works very well gi
ving a good pressure flow rate.
I did a paper on plenum inlet design some time ago due to poor fit and ques
tions on how large to make the plenum flange on the cowl and also some shap
es but the Europa install manual is good enough for most. I would recommen
d some changes as in my pdf attached on preventing water intrusion.
1. As a technique, try to have the NACA inlet into the cowl capture the
pressure by being semi sealed to the plenum and as we have found out, in ra
in, the water tends to =93stick=94 to the boundary layer or skin of the air
craft and will flow into the inlet filling the filter. Of course, when pa
rked rain will catch in the NACA duct and funnel into your inlet unless you
prevent that. One can make a slight deflector on the inlet lip that funne
ls the water from inflight and ground use out of the engine inlet. See Air
box water intrusion in the carb box pdf attached.
2. For those with home made plenums, be sure to install 1/8 inch drain h
oles in the plenum at a point lower than the air inlet to the carb (some so
rt of dip prior to the carb inlet would be nice) to prevent water from pool
ing in the plenum.
3. Every oil change, pull the filter and look into your plenum as in dam
p environments, water, will pool in the plenum, and from the drain holes, s
ome pollen or dust will form around the drain hole water drip hole and may
in fact plug the drain causing water to get into the carb/engine. Nasty.
4. For the 912/912S owners, in cold and rainy environments, you may be w
ell served to install a carb heat system and consider a water deflector or
siphon on the inlet to divert water from directly entering the air filter/p
lenum hole. On home made plenums I have seen the owner elevate the filter
to prevent water intrusion also.
I toyed with the idea of a Rotax 912S plenum in the Europa. It would work
with possibly less work when changing from two cone type air filter to a ca
rb heat and inlet setup.
See drawing:
[Diagram Description automatically generated]
Best Regards,
Bud Yerly
-----Original Message-----
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matr
onics.com> On Behalf Of n7188u
Sent: Wednesday, December 15, 2021 4:53 PM
Subject: Europa-List: Re: Induction cold air plenum
rb@gmail.com>>
Thanks "Spurpura",
It's good to hear that mine is like other XSs. I am probably going to do so
me surgery to this plenum anyway as I want to ensure enough clearance, smoo
th flow from the scoop into the plenum and some protection against water in
gress.
As a good airplane homebuilder friend of mine says: "There you go, adding a
nother two month of work to the project" :)
Chris
Read this topic online here:
https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforums.ma
tronics.com%2Fviewtopic.php%3Fp%3D505274%23505274&data=04%7C01%7C%7Cd
54908414ab54bb2f7b708d9c015d727%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%
7C637752022312156976%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2
luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=V4YWaGLlphcY2TYYTDG
jPqHcgggZEMp18KJcTJfB0d8%3D&reserved=0
%2Fwww.matronics.com%2FNavigator%3FEuropa-List&data=04%7C01%7C%7Cd549
08414ab54bb2f7b708d9c015d727%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C6
37752022312156976%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM
zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=aXEwbuC97ruPgQjxRiuUNJ
npKkcyuKRBX181TsHw6Z8%3D&reserved=0
%2Fforums.matronics.com%2F&data=04%7C01%7C%7Cd54908414ab54bb2f7b708d9
c015d727%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637752022312156976%7C
Unknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiL
CJXVCI6Mn0%3D%7C3000&sdata=xmZCSmqnjfluWxVhmgiWNib%2FgPLcDBpEwr2hBm88
20Y%3D&reserved=0
%2Fwiki.matronics.com%2F&data=04%7C01%7C%7Cd54908414ab54bb2f7b708d9c0
15d727%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637752022312156976%7CUn
known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJ
XVCI6Mn0%3D%7C3000&sdata=K9QmgSkAqeE%2FHLP%2BWljFV1%2BWPF2SqOvm9oDHBj
3FW6M%3D&reserved=0
F%2Fmatronics.com%2Fcontribution&data=04%7C01%7C%7Cd54908414ab54bb2f7
b708d9c015d727%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637752022312156
976%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1
haWwiLCJXVCI6Mn0%3D%7C3000&sdata=o4SlhlQ7sjyTzorDay%2B0Br%2BdylHA%2Bk
sww0B%2B6WNQWaE%3D&reserved=0
Message 14
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Induction cold air plenum |
For those on the matronics list:
A good dimensional analysis of the =93NACA=94 duct for proper operation is
in the attached NACA document.
A ratio of 4 to one width to depth and a shape as shown in the NACA Ames R
esearch Center document 5121 attached gives the optimum shape of the inlet.
The NACA document has a lip that was changed over the series of tests but i
n reality just a flat thin inlet (thickness of the skin) works very well gi
ving a good pressure flow rate.
I did a paper on plenum inlet design some time ago due to poor fit and ques
tions on how large to make the plenum flange on the cowl and also some shap
es but the Europa install manual is good enough for most. I would recommen
d some changes as in my pdf attached on preventing water intrusion.
1. As a technique, try to have the NACA inlet into the cowl capture the
pressure by being semi sealed to the plenum and as we have found out, in ra
in, the water tends to =93stick=94 to the boundary layer or skin of the air
craft and will flow into the inlet filling the filter. Of course, when pa
rked rain will catch in the NACA duct and funnel into your inlet unless you
prevent that. One can make a slight deflector on the inlet lip that funne
ls the water from inflight and ground use out of the engine inlet. See Air
box water intrusion in the carb box pdf attached.
2. For those with home made plenums, be sure to install 1/8 inch drain h
oles in the plenum at a point lower than the air inlet to the carb (some so
rt of dip prior to the carb inlet would be nice) to prevent water from pool
ing in the plenum.
3. Every oil change, pull the filter and look into your plenum as in dam
p environments, water, will pool in the plenum, and from the drain holes, s
ome pollen or dust will form around the drain hole water drip hole and may
in fact plug the drain causing water to get into the carb/engine. Nasty.
4. For the 912/912S owners, in cold and rainy environments, you may be w
ell served to install a carb heat system and consider a water deflector or
siphon on the inlet to divert water from directly entering the air filter/p
lenum hole. On home made plenums I have seen the owner elevate the filter
to prevent water intrusion also.
I toyed with the idea of a Rotax 912S plenum in the Europa. It would work
with possibly less work when changing from two cone type air filter to a ca
rb heat and inlet setup.
See drawing:
[Diagram Description automatically generated]
Best Regards,
Bud Yerly
-----Original Message-----
From: owner-europa-list-server@matronics.com<mailto:owner-europa-list-serve
r@matronics.com> <owner-europa-list-server@matronics.com<mailto:owner-europ
a-list-server@matronics.com>> On Behalf Of n7188u
Sent: Wednesday, December 15, 2021 4:53 PM
Subject: Europa-List: Re: Induction cold air plenum
rb@gmail.com>>
Thanks "Spurpura",
It's good to hear that mine is like other XSs. I am probably going to do so
me surgery to this plenum anyway as I want to ensure enough clearance, smoo
th flow from the scoop into the plenum and some protection against water in
gress.
As a good airplane homebuilder friend of mine says: "There you go, adding a
nother two month of work to the project" :)
Chris
Read this topic online here:
https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforums.ma
tronics.com%2Fviewtopic.php%3Fp%3D505274%23505274&data=04%7C01%7C%7Cd
54908414ab54bb2f7b708d9c015d727%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%
7C637752022312156976%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2
luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=V4YWaGLlphcY2TYYTDG
jPqHcgggZEMp18KJcTJfB0d8%3D&reserved=0
%2Fwww.matronics.com%2FNavigator%3FEuropa-List&data=04%7C01%7C%7Cd549
08414ab54bb2f7b708d9c015d727%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C6
37752022312156976%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM
zIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=aXEwbuC97ruPgQjxRiuUNJ
npKkcyuKRBX181TsHw6Z8%3D&reserved=0
%2Fforums.matronics.com%2F&data=04%7C01%7C%7Cd54908414ab54bb2f7b708d9
c015d727%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637752022312156976%7C
Unknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiL
CJXVCI6Mn0%3D%7C3000&sdata=xmZCSmqnjfluWxVhmgiWNib%2FgPLcDBpEwr2hBm88
20Y%3D&reserved=0
%2Fwiki.matronics.com%2F&data=04%7C01%7C%7Cd54908414ab54bb2f7b708d9c0
15d727%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637752022312156976%7CUn
known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJ
XVCI6Mn0%3D%7C3000&sdata=K9QmgSkAqeE%2FHLP%2BWljFV1%2BWPF2SqOvm9oDHBj
3FW6M%3D&reserved=0
F%2Fmatronics.com%2Fcontribution&data=04%7C01%7C%7Cd54908414ab54bb2f7
b708d9c015d727%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637752022312156
976%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1
haWwiLCJXVCI6Mn0%3D%7C3000&sdata=o4SlhlQ7sjyTzorDay%2B0Br%2BdylHA%2Bk
sww0B%2B6WNQWaE%3D&reserved=0
Message 15
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Induction cold air plenum |
One more thing.
How to you place the NACA duct for your plenum is an issue many have fought.
I simply put on the top cowl and screw it down. I then set the front elevation
properly to the spinner. Using a marker to trace the outline of the plenum on
the cowl inside allows me to precisely plan my cowl seal flange. Once the flange
is set, the cowl seal or foam or whatever you wish to get a nice airflow
semi seal will work well. That sets the position fore and aft/ left and right
for the NACA inlet much easier. From that many plans and measurements can be
made and finally whack the curvy lines and set the slope of the inlet ramp.
(Technically it is a 7 degree slope for isentropic flow.) Make the sides sharp.
It enhances the vortex from the side.
If you just follow the manual, it can be a bit misleading, but the NACA placement
can be fined tune once the engine is installed by doing the above.
Best Regards,
Bud Yerly
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505276#505276
Message 16
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Mandatory U.K. LAA permit directive. Shoot-Bolt stop |
Graphical answer to why europa pilots need to ensure doors are correctly locked
before getting airborne and to refrain from opening them in flight... firstly
they are positioned in a constant low pressure area trying to tear them off,
and secondly once they have departed the airframe about 30% lift is no longer
available to maintain altitude...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505277#505277
Attachments:
http://forums.matronics.com//files/95ba45dd_26b1_4876_a8b4_c30fb01040a2_557.jpeg
Message 17
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Naca Duct Size |
Hi Darren,
Have visited the hangar to take some measurements of the Naca Duct.
The opening is 120mm x 34mm.
The length of the duct is 230mm.
Duct width starts at 20mm to 120mm.
Centred from the Spinner.
Hope that helps, good luck.
Cheers,
Tim
Sent from my iPad
Tim Ward
12 Waiwetu Street,
Fendalton,
Christchurch, 8052
New Zealand.
ward.t@xtra.co.nz
021 0640221
> On 16/12/2021, at 10:47 AM, timward <ward.t@xtra.co.nz> wrote:
>
> =EF=BBDarren,
> That is the opening into the plenum chamber approximately. If you are not i
n a hurry I can measure it exactly next time at the hanger. The length is re
ally up to you, however a gentle entrance to direct the airflow would be bet
ter. Not too much pressure build up. See photo.
> Cheers,
> Tim
>
>
> Sent from my iPad
> Tim Ward
> 12 Waiwetu Street,
> Fendalton,
> Christchurch, 8052
> New Zealand.
> ward.t@xtra.co.nz
> 021 0640221
>
>>> On 16/12/2021, at 10:39 AM, daaza22 <royledarren@gmail.com> wrote:
>>>
com>
>>
>> Tim
>> Thanks for the reply and photo .
>> sorry to be a pain but could you confirm
>> 25mm for the narrow end
>> 100mm for widest part
>> 100mm long . ?
>>
>> Darren
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=505272#505272
>>
>>
>>
>>
>>
>>
==========================
=========
==========================
=========
==========================
=========
==========================
=========
==========================
=========
>>
>>
>>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|