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Naca Duct Size

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daaza22

Joined: 09 Sep 2020
Posts: 33

Posted: Wed Dec 15, 2021 10:54 am Post subject: Naca Duct Size

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

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ward.t(at)xtra.co.nz
Guest

Posted: Wed Dec 15, 2021 12:32 pm Post subject: Naca Duct Size

Hi Darren,Measurements not given in the Mod 43 so I made my Naca Duct dimensions approximately 100mm x 25mm. I also centred it on the top cowl, looks better and not in the way of the coolant cap. See photo. 

Cheers,

Tim

[img]cid:E3497D2F-6BD3-4801-B9E5-7FA35ACD8601-L0-001[/img]



Sent from my iPadTim Ward

12 Waiwetu Street, 

Fendalton, 

Christchurch, 8052

New Zealand.

ward.t(at)xtra.co.nz 

021 0640221

 	  Quote: 	
		  On 16/12/2021, at 8:02 AM, daaza22 <royledarren(at)gmail.com> wrote:



ï»¿--> Europa-List message posted by: "daaza22" <royledarren(at)gmail.com>



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

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daaza22

Joined: 09 Sep 2020
Posts: 33

Posted: Wed Dec 15, 2021 1:31 pm Post 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

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ward.t(at)xtra.co.nz
Guest

Posted: Wed Dec 15, 2021 1:47 pm Post subject: 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 really up to you, however a gentle entrance to direct the airflow would be better. Not too much pressure build up. See photo.

Cheers,

Tim

Sent from my iPadTim Ward

12 Waiwetu Street, 

Fendalton, 

Christchurch, 8052

New Zealand.

ward.t(at)xtra.co.nz 

021 0640221

 	  Quote: 	
		  On 16/12/2021, at 10:39 AM, daaza22 <royledarren(at)gmail.com> wrote:



ï»¿--> Europa-List message posted by: "daaza22" <royledarren(at)gmail.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



<=====================================

- The Matronics Europa-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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ward.t(at)xtra.co.nz
Guest

Posted: Wed Dec 15, 2021 9:58 pm Post subject: 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 iPadTim Ward

12 Waiwetu Street, 

Fendalton, 

Christchurch, 8052

New Zealand.

ward.t(at)xtra.co.nz 

021 0640221

 	  Quote: 	
		  On 16/12/2021, at 10:47 AM, timward <ward.t(at)xtra.co.nz> wrote:



ï»¿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 really up to you, however a gentle entrance to direct the airflow would be better. Not too much pressure build up. See photo.

Cheers,

Tim

Sent from my iPadTim Ward

12 Waiwetu Street, 

Fendalton, 

Christchurch, 8052

New Zealand.

ward.t(at)xtra.co.nz 

021 0640221

 	  Quote: 	
		  On 16/12/2021, at 10:39 AM, daaza22 <royledarren(at)gmail.com> wrote:



ï»¿--> Europa-List message posted by: "daaza22" <royledarren(at)gmail.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



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John Wighton

Joined: 18 May 2010
Posts: 241

Posted: Thu Dec 16, 2021 12:44 am Post subject: Re: Naca Duct Size

I have a 912ULS cowling (XS version) NACA duct mould tool if anyone wishes to use it.  UK based.



Also a complete set of untouched cowlings (XS), with intake moulding tool.



Some firewall forward parts as well (lower air scoop alloy parts, seals, etc).



And an oil cooler, unused (nib as they say).



john(at)wighton.net

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_________________
John Wighton
Europa XS trigear G-IPOD

daaza22

Joined: 09 Sep 2020
Posts: 33

Posted: Thu Dec 16, 2021 10:52 am Post subject: Re: Naca Duct Size

thanks all for your help .

I will mark the Naca  duct out tomorrow with the sizes suggested .



Also John ,the tool you mention , is that a mould ?



Darren

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