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top cowl carb air inlet

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rowlandcarson(at)gmail.co
Guest

Posted: Tue Mar 15, 2016 12:22 pm Post subject: top cowl carb air inlet

I’ve bought Neville Eyre’s cowl set and I am wondering how to get the air into the cowling to the plenum chamber for the carbs.



The Europa manual describes making a NACA duct on the top cowl to connect to the plenum chamber, at a marked position. If I understand the manual correctly, it appears that a buck or splash moulding is supplied with the factory cowl set. It is pushed through the cowl from the outside and the duct is laid up inside the cowl against the splash moulding.



Neville has not supplied anything to make the NACA duct for the plenum chamber. Obviously I can work out the position on the cowl from careful measurement of the plenum relative to the firewall, but I don’t have any information or pattern for the shape and size of the NACA duct.



Does anyone have one of these splash mouldings from the factory that I could borrow, please? I don’t need it right now, but want to make sure I have some way of dealing with this problem when I come to it.



Or, if I’m not understanding how the NACA duct is made, can someone please explain it to me!



in friendship



Rowland



| Rowland Carson          ... that's Rowland with a 'w' ...

| <rowlandcarson(at)gmail.com>            http://www.rowlandcarson.org.uk

| Skype, Twitter: rowland_carson      Facebook: Rowland Carson

| pictures: http://picasaweb.google.com/rowlandcarson

alan.twigg775(at)gmail.co
Guest

Posted: Tue Mar 15, 2016 1:04 pm Post subject: top cowl carb air inlet

Nev,s cowling uses baffles similar to a Lycoming/Continental, no plenum needed.

Pictures to follow.

Alan



Sent from my iPad



 	  Quote: 	
		   On 15 Mar 2016, at 20:22, Rowland Carson <rowlandcarson(at)gmail.com> wrote:

 

 

 

 Iâ€™ve bought Neville Eyreâ€™s cowl set and I am wondering how to get the air into the cowling to the plenum chamber for the carbs.

 

 The Europa manual describes making a NACA duct on the top cowl to connect to the plenum chamber, at a marked position. If I understand the manual correctly, it appears that a buck or splash moulding is supplied with the factory cowl set. It is pushed through the cowl from the outside and the duct is laid up inside the cowl against the splash moulding.

 

 Neville has not supplied anything to make the NACA duct for the plenum chamber. Obviously I can work out the position on the cowl from careful measurement of the plenum relative to the firewall, but I donâ€™t have any information or pattern for the shape and size of the NACA duct.

 

 Does anyone have one of these splash mouldings from the factory that I could borrow, please? I donâ€™t need it right now, but want to make sure I have some way of dealing with this problem when I come to it.

 

 Or, if Iâ€™m not understanding how the NACA duct is made, can someone please explain it to me!

 

 in friendship

 

 Rowland

 

 | Rowland Carson          ... that's Rowland with a 'w' ...

 | <rowlandcarson(at)gmail.com>            http://www.rowlandcarson.org.uk

 | Skype, Twitter: rowland_carson      Facebook: Rowland Carson

 | pictures: http://picasaweb.google.com/rowlandcarson

churchy

Joined: 04 Nov 2011
Posts: 48

Posted: Tue Mar 15, 2016 1:08 pm Post subject: top cowl carb air inlet

Rowland, I have the Nev Eyre cowl set as well (though not yet built) and my understanding is that it does away with the fresh air inlet by guiding fresh air over the top of the engine from the cooling ducts immediately behind the prop - as a result, you simply put "normal" Rotax air filters onto the carb inlets and use air from directly inside the cowling.  There is a picture of this set up on the Europa website where Nev's cowls are shown with the top off.



Reds

Richard CC



 	  Quote: 	
		   On 15 Mar 2016, at 20:22, Rowland Carson <rowlandcarson(at)gmail.com> wrote:

 

 

 

 Iâ€™ve bought Neville Eyreâ€™s cowl set and I am wondering how to get the air into the cowling to the plenum chamber for the carbs.

 

 The Europa manual describes making a NACA duct on the top cowl to connect to the plenum chamber, at a marked position. If I understand the manual correctly, it appears that a buck or splash moulding is supplied with the factory cowl set. It is pushed through the cowl from the outside and the duct is laid up inside the cowl against the splash moulding.

 

 Neville has not supplied anything to make the NACA duct for the plenum chamber. Obviously I can work out the position on the cowl from careful measurement of the plenum relative to the firewall, but I donâ€™t have any information or pattern for the shape and size of the NACA duct.

 

 Does anyone have one of these splash mouldings from the factory that I could borrow, please? I donâ€™t need it right now, but want to make sure I have some way of dealing with this problem when I come to it.

 

 Or, if Iâ€™m not understanding how the NACA duct is made, can someone please explain it to me!

 

 in friendship

 

 Rowland

 

 | Rowland Carson          ... that's Rowland with a 'w' ...

 | <rowlandcarson(at)gmail.com>            http://www.rowlandcarson.org.uk

 | Skype, Twitter: rowland_carson      Facebook: Rowland Carson

 | pictures: http://picasaweb.google.com/rowlandcarson

rowlandcarson(at)gmail.co
Guest

Posted: Tue Mar 15, 2016 1:13 pm Post subject: top cowl carb air inlet

On 2016-03-15, at 20:22, Rowland Carson <rowlandcarson(at)gmail.com> wrote:



 	  Quote: 	
		   I’ve bought Neville Eyre’s cowl set and I am wondering how to get the air into the cowling to the plenum chamber for the carbs.

 

 The Europa manual describes making a NACA duct on the top cowl to connect to the plenum chamber, at a marked position. If I understand the manual correctly, it appears that a buck or splash moulding is supplied with the factory cowl set. It is pushed through the cowl from the outside and the duct is laid up inside the cowl against the splash moulding.


	


I’ve had a reply already offering the splash moulding when I need it, and I have also spotted a picture of the thing itself posted by Bob Harrison on 18 June 2014, showing what some folk use it for after the build is complete.



However, I’ve been studying the manual again and I notice that in the instructions for making the rectangular flange to support the rubber skirt that seals around the air filter, it says:



"Make cardboard formers in the manner described for the [NACA duct] side pieces”



which suggests that there was an older method which has not been completely excised from the manual. I’m guessing that this approach used the piece cut out of the cowl as the ramp and cardboard formers were used to support the layup of the sides of the duct.



Just out of interest, does anyone have a copy of a previous version of the firewall forward manual that includes a different recipe for making the inlet duct that involves cardboard formers?



in friendship



Rowland



| Rowland Carson          ... that's Rowland with a 'w' ...

| <rowlandcarson(at)gmail.com>            http://www.rowlandcarson.org.uk

| Skype, Twitter: rowland_carson      Facebook: Rowland Carson

| pictures: http://picasaweb.google.com/rowlandcarson

rowlandcarson(at)gmail.co
Guest

Posted: Tue Mar 15, 2016 1:34 pm Post subject: top cowl carb air inlet

On 2016-03-15, at 21:08, Sky <richard.churchill-coleman(at)sky.com> wrote:



 	  Quote: 	
		   Rowland, I have the Nev Eyre cowl set as well (though not yet built) and my understanding is that it does away with the fresh air inlet by guiding fresh air over the top of the engine from the cooling ducts immediately behind the prop - as a result, you simply put "normal" Rotax air filters onto the carb inlets and use air from directly inside the cowling.  There is a picture of this set up on the Europa website where Nev's cowls are shown with the top off.


	


Richard - thanks for your message, thanks to Alan Twigg too. It seems you folk have had more than I got from Neville in the way of documentation (well, I don’t think I got anything on paper).



I’ve looked on the Europa factory website and can’t find any pictures of or reference to Neville’s cowls. Can you give me the exact URL, please?



in friendship



Rowland



| Rowland Carson          ... that's Rowland with a 'w' ...

| <rowlandcarson(at)gmail.com>            http://www.rowlandcarson.org.uk

| Skype, Twitter: rowland_carson      Facebook: Rowland Carson

| pictures: http://picasaweb.google.com/rowlandcarson

fireflier

Joined: 24 Jun 2012
Posts: 58

Posted: Tue Mar 15, 2016 1:44 pm Post subject: top cowl carb air inlet

Hi Rowland

I have just posted photos of nev's kit installed in my aircraft.  When i done my install there was no documentation from Nev.  U had a good chat with him and got a good understanding of how everything was to be fitted.  It actually goes together pretty easily. 

Should you need any advice or guidance feel free to get in touch with me and i will try my best to help as much as i can.  If i can remember. 

Regards

Donald

G-PUPY

Sent from my iPhone

 	  Quote: 	
		   On 15 Mar 2016, at 21:33, Rowland Carson <rowlandcarson(at)gmail.com> wrote:

> On 2016-03-15, at 21:08, Sky <richard.churchill-coleman(at)sky.com> wrote:

> 

> Rowland, I have the Nev Eyre cowl set as well (though not yet built) and my understanding is that it does away with the fresh air inlet by guiding fresh air over the top of the engine from the cooling ducts immediately behind the prop - as a result, you simply put "normal" Rotax air filters onto the carb inlets and use air from directly inside the cowling.  There is a picture of this set up on the Europa website where Nev's cowls are shown with the top off.

 Richard - thanks for your message, thanks to Alan Twigg too. It seems you folk have had more than I got from Neville in the way of documentation (well, I donâ€™t think I got anything on paper).

 Iâ€™ve looked on the Europa factory website and canâ€™t find any pictures of or reference to Nevilleâ€™s cowls. Can you give me the exact URL, please?

 in friendship

 Rowland

 | Rowland Carson          ... that's Rowland with a 'w' ...

 | <rowlandcarson(at)gmail.com>            http://www.rowlandcarson.org.uk

 | Skype, Twitter: rowland_carson      Facebook: Rowland Carson

 | pictures: http://picasaweb.google.com/rowlandcarson

_________________
Fireflier

JonSmith

Joined: 21 May 2010
Posts: 110

Posted: Tue Mar 15, 2016 3:08 pm Post subject: Re: top cowl carb air inlet

Some pics here Rowland;



http://www.theeuropaclub.org/for-builders/cowl-cooling/neville-eyres-revised-cowl/

_________________
G-TERN
Classic Mono

neveyre(at)aol.com
Guest

Posted: Wed Mar 16, 2016 12:14 pm Post subject: top cowl carb air inlet

Hi Rowland,

  Glad to hear you are on with it, smart thing would have been to call or email me directly with your question ?

  All pretty straight forward, no need to do any glassing / cutting of the cowls, I designed and manufactured them so you don't have to ! If it takes you more than a morning to fit them you are doing something wrong !

  Air to the carbs is taken from under the cowl, no chance of water ingress via a NACA scoop when parked.. Prefered filters are the conical K&N's direct on the carbs, but the Europa airbox set up will work. The airbox / NACA set up was needed with the standard XS cowls as it gets hotter than hell in there with no through airflow. Air temps inside the upper cowl taken at shutdown after a 2 hour flight were below ambient, nothing above the baffles got hot enough to darken the 40 C bar on the temp' test strips.

  The baffles will direct cold air all the way to the rear of the cowl, and with the top of the tunnel gap blocked off with a baffle, little heat build up there after shutdown. Baffles also prevent the exhaust headers cooking the fuel in the carbs.

  I'm sure you had copies of the baffle templates [ baffles made from soft alloy] if not I can send you a set. With this installation, you can run on the ground at 2,000 rpm all day, and do the 5 minute WOT run for the LaaLaaLand pre 1st flight test without burning the cowls or chucking the coolant overboard  [BTW use 50/50 antifreeze / water, not the ''other stuff'' ]

  As you only had the cowls [ not my complete kit] just follow the Europa FWF Manual as far as mounting and plumbing the engine, in the same position as the XS Europa kit.

  Cheers,

  Nev

   

   

  --

flyingphil2

Joined: 04 Dec 2009
Posts: 117

Posted: Thu Mar 17, 2016 2:24 am Post subject: Re: top cowl carb air inlet

Thanks for the link Jon, that looks like a really nice installation.

rowlandcarson(at)gmail.co
Guest

Posted: Thu Mar 17, 2016 4:08 am Post subject: top cowl carb air inlet

On 2016-03-17, at 07:38, Alan Twigg <Alan.Twigg775(at)Gmail.com> wrote:



 	  Quote: 	
		   Posting this for Neville, re his cowlings.


	


Alan - thanks for that (and thanks to all who replied to my question).



I’ve sent a message direct to Neville and hope he will now be able to provide the documentation for the cowl and baffle installation - I’ve had nothing in writing so far, and cannot find his cowl mod on the LAA mod list.



in friendship



Rowland



| Rowland Carson          ... that's Rowland with a 'w' ...

| <rowlandcarson(at)gmail.com>            http://www.rowlandcarson.org.uk

| Skype, Twitter: rowland_carson      Facebook: Rowland Carson

| pictures: http://picasaweb.google.com/rowlandcarson

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