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lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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 Posted: Mon Feb 22, 2016 11:39 pm Post subject: AOA video |
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https://vimeo.com/156368644 password- owyheeflyer
This is the video that I took while testing my crude wind vane to get some idea of how much movement would be expected leading up to a stall. I intended to do it last night, but when I looked at the video of the GPS speed, I about convinced my self that I had not stalled after all. I really had run it until it began to burble, and saw no need to go any further than that. Then when I saw that the GPS speed was 40 MPH, I was confused until I realized that I was doing my stalls down wind, and the ASI was showing 29 MPH. I guess that is the reason they say that the stall speed can change, but the Angle of Attack will not.
It was too windy to fly today, but I have changed out the vane and replaced it with a 12 inch piece of yarn. I will mark it where I expect it to stall, and by lengthening it, the ability to see when it will stall will be at least doubled by the longer piece of yarn.
Larry
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The older I get, the less tolerant I am of those who are intolerant.
If you forward this email, or any part of it, please remove my email address before sending.
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Tue Feb 23, 2016 5:40 am Post subject: Re: AOA video |
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Thank you for doing that. Finished the winter maintenance on the MKIII, did a couple test flights and am now airworthy again, however my AOA meter is still sitting on the work bench awaiting the arrival of the gauge itself. So your comments have given me an idea of what baseline alignment ought to be.
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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Tue Feb 23, 2016 5:54 am Post subject: AOA video |
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Forget about ground speed when flying, except to calculate your ETA back to the barn.
Easy to screw up turning base to final, near the stall, with a little tail wind. Perceived ground speed is high, air speed is low. That is why I continually cross check my ASI. Takes a split second to scan. Doesn't cost anything. 
john h
mkIII
Titus, Alabama
From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of Larry Cottrell
Sent: Tuesday, February 23, 2016 1:39 AM
To: kolb-list(at)matronics.com
Subject: AOA video
https://vimeo.com/156368644 password- owyheeflyer
This is the video that I took while testing my crude wind vane to get some idea of how much movement would be expected leading up to a stall. I intended to do it last night, but when I looked at the video of the GPS speed, I about convinced my self that I had not stalled after all. I really had run it until it began to burble, and saw no need to go any further than that. Then when I saw that the GPS speed was 40 MPH, I was confused until I realized that I was doing my stalls down wind, and the ASI was showing 29 MPH. I guess that is the reason they say that the stall speed can change, but the Angle of Attack will not.
It was too windy to fly today, but I have changed out the vane and replaced it with a 12 inch piece of yarn. I will mark it where I expect it to stall, and by lengthening it, the ability to see when it will stall will be at least doubled by the longer piece of yarn.
Larry
--
The older I get, the less tolerant I am of those who are intolerant.
If you forward this email, or any part of it, please remove my email address before sending.
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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ceengland7(at)gmail.com
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| Posted: Tue Feb 23, 2016 7:56 am Post subject: AOA video |
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On 2/23/2016 1:38 AM, Larry Cottrell wrote:
| Quote: | https://vimeo.com/156368644 password- owyheeflyer
This is the video that I took while testing my crude wind vane to get
some idea of how much movement would be expected leading up to a
stall. I intended to do it last night, but when I looked at the video
of the GPS speed, I about convinced my self that I had not stalled
after all. I really had run it until it began to burble, and saw no
need to go any further than that. Then when I saw that the GPS speed
was 40 MPH, I was confused until I realized that I was doing my stalls
down wind, and the ASI was showing 29 MPH. I guess that is the reason
they say that the stall speed can change, but the Angle of Attack will
not.
It was too windy to fly today, but I have changed out the vane and
replaced it with a 12 inch piece of yarn. I will mark it where I
expect it to stall, and by lengthening it, the ability to see when it
will stall will be at least doubled by the longer piece of yarn.
Larry
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GPS ground speed is irrelevant to stall speed, just as it's irrelevant
to airspeed in general. Stall indicated airspeed changes with weight,
assuming a 1 G stall. (Stall *true* airspeed changes with density altitude.)
To see the effects of changing indicated airspeed at stall, get your AOA
working consistently and reliably, and fly a stall series with minimal
fuel and as light a payload as possible. Note the indicated airspeed and
AOA at stall. Then load the plane up with full fuel and max payload to
gross weight, and fly another stall series. You should see a higher
indicated airspeed at stall, but the same AOA.
(GPS ground speed can vary all over the map, depending on wind
speed/direction at that moment & your heading when doing the stall series.)
Charlie
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keith keith
Joined: 16 Sep 2015
Posts: 1
Location: huntingdon pa.
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| Posted: Wed Feb 24, 2016 7:54 am Post subject: Re: AOA video |
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i'am new to kolbs bought one last spring , now have 15 hrs. have slowed to 30 mph and called it a stall, but realty didn't, has anyone held it so it reacted significantly ? I want to know what it will do. thanks keith
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