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Into wind or downwind to run cooler on ground?

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rparigor(at)suffolk.lib.n
Guest

Posted: Sun Apr 29, 2007 4:22 pm Post subject: Into wind or downwind to run cooler on ground?

I just read an artilce in April Kitplanes "Baffled by Baffles". One of the

things discovered after tufting everything including the intake for large

displacement aircooled engine was when pointed into the wind, even doing

run up there was absolute no airflow! They descided to not go flying till

they figured out why, and when headed back the second they turned

downwind, air began to flow (They had small camera able to view what was

going on). They began to fool on ground and sure as anything, no flow into

wind, flow begins when downwind. Conclusion was the prop was at more of an

angle of attack pointed downwind and was creating a larger low pressure

area.



Has anyone actual tried pointing downwind, versus pointing into the wind

when stuck on the ground for extended periods with a Europa? Does pointing

downwind yield lower temperatures?



Especial interested in results with monowheel with "Groundloop" adjustable

Airmaster prop (course and fine tested)?



Thx.

Ron Parigoris

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DuncanPilot

Joined: 26 Mar 2007
Posts: 1
Location: UK

Posted: Mon Apr 30, 2007 2:59 am Post subject: Into wind or downwind to run cooler on ground?

We have. Into wind was better for our Europa with a 3-blade Warp prop. The

reason I mention the prop is that we switched prop and saw considerable

improvement in the cooling.



My theory is that our 3 blade Warp prop was not good at pushing air into the

cowling so pointing it into wind made a big difference. I am not sure how

this theory fits into your scenario?????



Duncan Bennett



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_________________
Duncan

G-BYFG. Europa XS. Jabiru 3300

willie.harrison(at)tinyon
Guest

Posted: Mon Apr 30, 2007 3:30 am Post subject: Into wind or downwind to run cooler on ground?

My experience with WD is identical to Duncan's. Last year I had a  

boil-over (admittedly with the pre-mod coolant pressure cap) whilst  

held by ATC for 10 minutes pointing downwind on a taxiway. No  

problems now that I make a point of swinging into wind whilst holding.



Willie Harrison

On 30 Apr 2007, at 11:57, Duncan Bennett wrote:



[quote] 

 <Duncan.Bennett(at)talktalk.net>



 We have. Into wind was better for our Europa with a 3-blade Warp  

 prop. The

 reason I mention the prop is that we switched prop and saw  

 considerable

 improvement in the cooling.



 My theory is that our 3 blade Warp prop was not good at pushing air  

 into the

 cowling so pointing it into wind made a big difference. I am not  

 sure how

 this theory fits into your scenario?????



 Duncan Bennett



 --

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grahamsingleton(at)btinte
Guest

Posted: Mon Apr 30, 2007 4:30 am Post subject: Into wind or downwind to run cooler on ground?

Some guys here in UK with a Jab 6 tri gear had bad cooling problems with 

a Warp Drive 3 blade. Changed to a 2 blade with wider roots close to the 

hub and that improved the cooling significantly

Graham



Duncan Bennett wrote:

 	  Quote: 	
		   

 

 We have. Into wind was better for our Europa with a 3-blade Warp prop. The

 reason I mention the prop is that we switched prop and saw considerable

 improvement in the cooling.

 

 My theory is that our 3 blade Warp prop was not good at pushing air into the

 cowling so pointing it into wind made a big difference. I am not sure how

 this theory fits into your scenario?????

 

 Duncan Bennett

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ami(at)mcfadyean.freeserv
Guest

Posted: Mon Apr 30, 2007 12:03 pm Post subject: Into wind or downwind to run cooler on ground?

Warms up quicker (therefore less cooling airflow) when pointed downwind on

the ground. Also, prop vibration worse.

Sorry to confuse the 'theory'!



Duncan McF.

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