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Cooling & Cowling

 
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frans(at)paardnatuurlijk.
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PostPosted: Fri Oct 17, 2008 8:35 am    Post subject: Cooling & Cowling Reply with quote
[quote:022580b62a="Jeff Roberts"]Since I struggled with the cooling on my 912-S Tri gear for so very
long I thought I'd throw my thoughts into this subject. I have found
the air cooling of the fins to be inadequate. If you look at the round
inlets in relation to where the top of the engine sits you will find
they are too low and too outside.[/quote:022580b62a]

While fitting the cowling and planning some modifications to the lower cowling, I was also not happy about the position of the forward inlets. Thinking about it I got the idea to make Naca inlets in the top cowling, with a air flow promoting shroud, just above the fins, and close off the standard forward inlets. (I do not literally mean just putting some bid over it, but these positions can be used for other purposes, like landing lights.)

These naca inlets in the upper cowl and closing off the standard inlets would have the following advantages:
1) No path for the air to escape directly under the engine (instead of over the engine). This air is not just lost, but also increases the pressure under the engine, hindering the air flow through the fins.
2) During flight, air will enter here and finds its way down through the fins to the exit at the rear of the lower cowling.
3) No more need for the (expensive?) Rotax shroud and the third nostril (another drag creating hole).
4) No more need for the gills on the side. The naca inlets are in the top, just above the fins, so warm air will escape naturally there once the engine is shut down. The cowling won't heat up.
5) From the naca shroud It is easy to make a small bypass to cool things like alternator regulator. There are direct and straight ways in the top cowling to almost every part that needs to be cooled. All these ducts can be glassed in the top cowling.
6) Lower drag. I believe the standard inlets are very draggy, with their sharp endings, and there is no room to make a ramp to slow the air down before letting it loose in the engine bay. With the naca inlets, there is sufficient room to make a rounded expansion where the air can slow down and expand, without creating much turbulence.
7) Easy to implement. Naca inlets can be bought, closing off a hole is easy too.

I have yet to start with implementing this. Comments please, before I start cutting something that I'm going to regret later. Wink Do I oversee something?

Frans
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ptag.dev(at)tiscali.co.uk
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PostPosted: Fri Oct 17, 2008 12:01 pm    Post subject: Cooling & Cowling Reply with quote
Hi! Frans
I wouldn't be happy having rain entering the upper cowl when parked
outside for long periods.
However on my Jabiru installation I proved that Isolating all lower cowl
intake air such as for oil cooler allowed the down draught of general
cooling air to be more effective.
Regards
Bob Harrison G-PTAG

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paul.the.aviator(at)gmail
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PostPosted: Fri Oct 17, 2008 1:33 pm    Post subject: Cooling & Cowling Reply with quote
Hi Folks,

I have a similar question to Bob,

Is it possible to have a NACA on the top of the cowl that would have
some type of drain system that could handle rain when parked, or in
flight ?

Thanks, Paul

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frans(at)paardnatuurlijk.
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PostPosted: Fri Oct 17, 2008 2:44 pm    Post subject: Cooling & Cowling Reply with quote
[quote:66cffc2d56="ptag.dev"]

Hi! Frans
I wouldn't be happy having rain entering the upper cowl when parked
outside for long periods.
-----[/quote:66cffc2d56]

The cowling has a slope upwards, so I don't think rain will enter it easily. The standard inlet also isn't waterproof. Besides this, I have seen Europa's with a naca inlet on the cowling, I believe it is for the 912S?

Frans
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frans(at)paardnatuurlijk.
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PostPosted: Fri Oct 17, 2008 2:51 pm    Post subject: Cooling & Cowling Reply with quote
[quote:4340d7261f="paul.the.aviator(at)gmail.co"]

Is it possible to have a NACA on the top of the cowl that would have
some type of drain system that could handle rain when parked, or in
flight ?
[/quote:4340d7261f]

The standard air inlet is far from waterproof during flight, me thinks. But yes, I think it is possible to have a drain system on a naca duct, especially when it is sloping upwards, like it would be on the front of the upper cowling. That is, while it is parked. During flight it would be different, but none of the Europa inlets is waterproof during flight, so we won't loose anything with the naca duct.

Frans
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jrgowing(at)bigpond.net.a
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PostPosted: Fri Oct 17, 2008 11:17 pm    Post subject: Cooling & Cowling Reply with quote
Frans

The prototype Aussie designed Victa Aircruiser (which subsequently was
manufactured as the CT4 trainer aircraft in NZ, had an inlet on the sloping
aft spine of the cockpit. It merely had sump in the lowest part and a tube
emptying out the bottom of the aircraft.

JR (Bob) Gowing UK Kit 327 in Oz

do not archive
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