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Considering a few mods. Opinions?

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n7188u

Joined: 15 Nov 2015
Posts: 404

Posted: Sun Mar 26, 2023 5:23 pm Post subject: Considering a few mods. Opinions?

Dear Europa Friends,



Since my airplane is coming apart for painting, I wanted to implement the cockpit widening mod 67. Any negative experiences with doing this? I think it would help increase the comfort of the airplane as I notice that after a x-country flight my left arm hurts a little from rubbing on the door frame.



Since the door will be worked on I am going to change the gas strut attach point (my door was already built with the old style attach point). I know this is basically a must although the current configuration has worked OK.



At last, anyone has any experience with installing a monowheel wheel pant? I have a kit for that and was thinking about installing the front part only. I am not doing it for the speed as I know the wheel is basically blocked by the cowling's exhaust but I think it could help seal the wheel well better and possibly reduce turbulent air getting into it (noise).



Chris

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Area-51

Joined: 03 May 2021
Posts: 391

Posted: Sun Mar 26, 2023 6:30 pm Post subject: Re: Considering a few mods. Opinions?

Attached is a rudimentary cross section of free stream air through the forward fuselage voids at 100kt without lower cowl ducting.



From experience flying in a mono with wheel fairing fitted; with ANR switched on at the time there was no detectible change in cabin noise volume compared to flying in 181. However the degree off air flow through the cockpit was greatly multiplied due to the wheel well being mostly sealed off during flight; not fitting the rear portion of the fairing will greatly diminish this ventilation feature.

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peterz(at)zutrasoft.com
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Posted: Mon Mar 27, 2023 12:56 am Post subject: Considering a few mods. Opinions?

Lower the wheel such that it’s 45-50% exposed. Its too high in your sim. (And would love to see an 8.00 tire)



Thx!

Pete



 	  Quote: 	
		   On Mar 26, 2023, at 10:36 PM, Area-51 <goldsteinindustrial(at)gmail.com> wrote:

 

 

 

 Attached is a rudimentary cross section of free stream air through the forward fuselage voids without lower cowl ducting.

 

> From experience flying in a mono with wheel fairing fitted; with ANR switched on at the time there was no detectible change in cabin noise volume compared to flying in 181. However the degree off air flow through the cockpit was greatly multiplied due to the wheel well being mostly sealed off during flight; not fitting the rear portion of the fairing will greatly diminish this ventilation feature.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=510515#510515

 

 

 

 

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 http://forums.matronics.com//files/9727fbf9_885d_4ac6_bc0d_a372d13ea377_675.jpeg

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Area-51

Joined: 03 May 2021
Posts: 391

Posted: Mon Mar 27, 2023 2:49 am Post subject: Re: Considering a few mods. Opinions?

Already reset it to correct position and sizing ages ago; just haven't updated to the latest solution; its going be an arduous procedure with all the fine details now in the mix... i did mention the above sample is rudimentary... 🤷🏼‍♂️

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n7188u

Joined: 15 Nov 2015
Posts: 404

Posted: Mon Mar 27, 2023 11:57 am Post subject: Re: Considering a few mods. Opinions?

Air spilled from the intake duct looks terrible.



I also have the duct open on the lower starboard side of the cowling. I guess that is there for the 914 but I kept it open because it seems to provide some cool air to the oil tank area and rear of the engine. I dare to say it may even augment the flow through the exit a little. My cooling system is working very well so afraid to change anything at this point. 



I am planning to remove the gills on the top cowling and make that area smooth. I have them closed right now and it seems to me they probably just add turbulence to the air going over them.



Chris

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n7188u

Joined: 15 Nov 2015
Posts: 404

Posted: Mon Mar 27, 2023 12:05 pm Post subject: Re: Considering a few mods. Opinions?

BTW, I did a little number crunching of my own. I measured all the templates I used to cut the airbox sound deadening material and calculated the weight for the Noico material I used.



0.6 kg or 1.3 lbs. It is significant for a single component but for now I'll keep it.



Regarding the effect of this additional mass on the carburetor mounts, the airbox is well supported on the back. But that's not to say it has no effect on the carb rubber mounts so I will just double the inspections on that area. 



Chris

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peterz(at)zutrasoft.com
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Posted: Mon Mar 27, 2023 12:23 pm Post subject: Considering a few mods. Opinions?

Curious, how is it supported in the back?  Mine is spaced away from the firewall.



Thx!

PeteZ



 	  Quote: 	
		   On Mar 27, 2023, at 4:11 PM, n7188u <chmgarb(at)gmail.com> wrote:

 

 

 

 BTW, I did a little number crunching of my own. I measured all the templates I used to cut the airbox sound deadening material and calculated the weight for the Noico material I used.

 

 0.6 kg or 1.3 lbs. It is significant for a single component but for now I'll keep it.

 

 Regarding the effect of this additional mass on the carburetor mounts, the airbox is well supported on the back. But that's not to say it has no effect on the carb rubber mounts so I will just double the inspections on that area. 

 

 Chris

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=510527#510527

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n7188u

Joined: 15 Nov 2015
Posts: 404

Posted: Mon Mar 27, 2023 12:49 pm Post subject: Re: Considering a few mods. Opinions?

An aluminum bar is attached to the back of the box and down to the engine mount (the part that is fixed to the ring mount, not behind the rubber mounts). As shown in the plans.

Chris

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peterz(at)zutrasoft.com
Guest

Posted: Mon Mar 27, 2023 1:01 pm Post subject: Considering a few mods. Opinions?

Aha!  Makes sense. .....I have  a classic 



PeteZ

On Mon, Mar 27, 2023, 4:57 p.m. n7188u <chmgarb(at)gmail.com (chmgarb(at)gmail.com)> wrote:



 	  Quote: 	
		  --> Europa-List message posted by: "n7188u" <chmgarb(at)gmail.com (chmgarb(at)gmail.com)>

 

 An aluminum bar is attached to the back of the box and down to the engine mount (the part that is fixed to the ring mount, not behind the rubber mounts). As shown in the plans.

 Chris

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=510530#510530

 

 

 

 

 

 

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