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01-03-2015, 07:03 PM
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Join Date: Apr 2014
Location: Orlando, FL
Posts: 22
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Open Framed Pressure Recovery Wheel Pants?
Im curious if anyone has had any experience with open framed pressure recovery wheel pants?:
Thanks in advance! 
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David R.
Building an RV-8
Last edited by drozovs : 01-03-2015 at 07:05 PM.
Reason: Had to resize the photo.
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01-03-2015, 07:23 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by drozovs
Im curious if anyone has had any experience with open framed pressure recovery wheel pants?:
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That is not a pressure recovery shape. If it was, the original RV wheel pants would also have been called pressure recovery.
Pressure recovery will have a reversal (inside radius) in the body shape at the aft end.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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01-03-2015, 07:51 PM
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Join Date: Apr 2014
Location: Orlando, FL
Posts: 22
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Quote:
Originally Posted by rvbuilder2002
reversal (inside radius) in the body shape at the aft end.
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Can you please clarify what you mean RV? Im not following what you mean by the reversal part... my understanding of the purpose of a pressure recovery device is to provide a shape/contour that mitigates the abruptness of a flat or non-aero form that would otherwise further drop the local area pressure.
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David R.
Building an RV-8
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01-03-2015, 07:57 PM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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I've seen these "spats" or whatever you call them on 180's and some old timey planes. Does anyone know if they actually do anything?
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Actual repeat offender.
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01-03-2015, 08:01 PM
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Join Date: Apr 2014
Location: Orlando, FL
Posts: 22
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From everything I learned in my aero classes they should... I have a few questions on if the more progressive tear drop shape makes a "significant" difference or not. Im playing with the idea as I want something that gives me the aero performance without the negative down side of not being able to inspect my tire tread on pre and post flight... Thanks Aerhed!
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David R.
Building an RV-8
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01-03-2015, 08:01 PM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,645
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Im less concerned about what it is called and more interested in if it works. I had a friend with an Ercoupe with pants like your photo. He said they increased his speed - but they are so slow anyway, it would take more than those pants to make much of a difference.
I like the looks of the wheels on planes but realize the pants make a huge difference in the RV designs. Drovos - thanks for the post.
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rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
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01-03-2015, 08:04 PM
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Join Date: Apr 2014
Location: Orlando, FL
Posts: 22
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I agree on the "what its called" vs "how it works" too  !
I have a few feelers out to my aero-engineering buddies... Ill post anything I find out... Like Aerhed posted, Cessna tried them (briefly from what I understand), not sure if it was a effectiveness issue or the pain to structurally secure them from a single point as apposed to a "cage" design found on more traditional covers.
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David R.
Building an RV-8
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01-03-2015, 08:07 PM
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Join Date: Nov 2013
Location: Memphis, TN
Posts: 8
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Look forward to hearing your results
Thx
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01-03-2015, 08:11 PM
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Join Date: Jun 2010
Location: Anchorage, Alaska
Posts: 132
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Ya...what they're called is not important. That said, having a reflex toward the rear of the pant is what "rv" was getting at.
It wouldn't be any more difficult to shape them this way and may be beneficial.
Also, it might be improved even more by installing a "bullet" in front of the tire.
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Bob Edison
RV-7 N749ER...(GO NINERS)
ATP CFI-II-ME
Anchorage, Alaska
Let me know if you're RVing to Anchorage!
Last edited by rjbob : 01-03-2015 at 08:22 PM.
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01-03-2015, 08:21 PM
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Join Date: Oct 2009
Location: Newark, IL
Posts: 287
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spats
The spat configuration certainly offers the smallest frontal area.
IIRC, 80% of the drag is created on the downstream side of the object.
Difficult to integrate a gear leg intersection fairing...??
As a grass strip pilot, I see advantages.
Roger
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