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Search: Posts Made By: DanH
Forum: Traditional Aircraft Engines 08-19-2022, 09:43 AM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
It was not measured. It was calculated. Exit...

It was not measured. It was calculated.



Exit velocity? Yes, tried a long time ago, but I wasn't sure of the math or method and went on to other interests.
Forum: Traditional Aircraft Engines 08-19-2022, 07:12 AM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
I'm running a 10611, same physical size. It...

I'm running a 10611, same physical size. It would be interesting to make some pressure measurements. I don't have anything in the database for an RV-14 cowl.
Forum: Traditional Aircraft Engines 08-18-2022, 10:54 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
We'll never get there with a flat air cooled...

We'll never get there with a flat air cooled installation, but let's get all we can.



Might be a case of premature pitottemperaturation.
Forum: Traditional Aircraft Engines 08-18-2022, 10:03 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
No. Clearly this will require the Persian dish...

No. Clearly this will require the Persian dish to explain it properly. There are typically 8 to 10 in our dinner group under the HBC gazebo, and next year your night is Wednesday ;)



Such is life...
Forum: Traditional Aircraft Engines 08-18-2022, 09:45 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
Close! Dynamic pressure can be thought of as...

Close! Dynamic pressure can be thought of as kinetic energy due to mass and motion. Static pressure + dynamic pressure = total pressure. Static and dynamic can trade back and forth. In the cowl...
Forum: Traditional Aircraft Engines 08-18-2022, 08:08 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
Here it is calculated. The classic equation...

Here it is calculated. The classic equation is...

0.5 * density in slugs per cubic ft * velocity^2 in ft per second = q in lbs per sq ft

...but to make life easy there are spreadsheets or good...
Forum: Traditional Aircraft Engines 08-18-2022, 01:44 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
Dynamic pressure available due to aircraft...

Dynamic pressure available due to aircraft velocity.
Forum: Traditional Aircraft Engines 08-17-2022, 11:02 AM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
Andi is right, as usual. Nice work! Quick review...

Andi is right, as usual. Nice work!

Quick review says it's valid. Are you using the common piccolo setup from the white paper?

What Bill said. Pressure recovery is only one part of the puzzle,...
Forum: Traditional Aircraft Engines 08-15-2022, 09:59 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
Hi Pete. Yes, you have recovery. The question...

Hi Pete. Yes, you have recovery. The question is how much, specifically the percentage of available dynamic pressure converted to upper plenum static pressure. DeltaP across the baffles doesn't...
Forum: Traditional Aircraft Engines 09-06-2018, 09:29 AM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
No, you don't. Quite the opposite. With an...

No, you don't. Quite the opposite. With an experimental we are free to make whatever changes we wish to improve cooling performance. Of course, the two-edged sword rule applies; we're equally free...
Forum: Traditional Aircraft Engines 09-03-2018, 09:24 AM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
http://www.vansairforce.com/community/showthread.p...

http://www.vansairforce.com/community/showthread.php?t=37835

http://www.vansairforce.com/community/showthread.php?t=138102

http://www.vansairforce.com/community/showthread.php?t=143064

http://www.v...
Forum: Traditional Aircraft Engines 09-02-2018, 06:48 PM
Replies: 57
Sticky: ENGINE COOLING
Views: 42,657
Posted By DanH
Yep, you're right ;)

Yep, you're right ;)
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