Today's Message Index:
----------------------
1. 02:11 PM - Re: AOA (Richard Pike)
2. 02:43 PM - Re: Re: AOA (Larry Cottrell)
3. 03:05 PM - Re: Re: AOA (Charlie England)
4. 05:18 PM - Re: AOA (Richard Pike)
5. 07:51 PM - Re: Re: AOA (Charlie England)
Message 1
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Earlier this spring the topic of AOA indicators was kicked around for a while and
I ordered some items that I thought could be used to make one. Finally got
around to cobbing together a workbench version just to see what it did. It works
great on the bench, but in practice I don't think it would be something you
would want.
1st picture shows the gas tank sending unit with a vane out behind it. Level flight
attitude, and the LED fuel gauge below it, upside down. Lots of bars in the
green, then a yellow one and finally a red one up top.
The next several pictures show a gradually increasing angle of attack, some of
the green bars are out then a very high angle of attack, all you see is the yellow
and red bars.
Finally would be stalled, all you see is the red bar. Obviously you would need
a lot of trial and error fiddling to adjust the linkage between the vane and the
sender to correlate with the actual onset of the stall, but I think it could
be made to work.
The problem is in the gauge, it responds very slowly to changes from the sender.
The LED's turn off and on at 2 or 3 second intervals. Move the vane abruptly
and start counting: "One thousand one, one thousand two" - the first LED goes
out. "One thousand three, one thousand four." - the 2nd LED goes out. And so
on. In practice it is just too slow.
But it was interesting to fool around with.
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Would you consider yourself to be a good person?
https://www.youtube.com/watch?v=VWcDXT6pH7A
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457184#457184
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Message 2
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I was also "messing" with the AOA. I ended up with a red 12 inch piece of
Yarn and a target sticker on the side of my wind screen. When the yarn
reaches the sticker, you are going to be falling out of the air. Real
simple, costs nothing, and is visible while flying.
Larry
On Wed, Jun 15, 2016 at 3:08 PM, Richard Pike <thegreybaron@charter.net>
wrote:
>
> Earlier this spring the topic of AOA indicators was kicked around for a
> while and I ordered some items that I thought could be used to make one.
> Finally got around to cobbing together a workbench version just to see what
> it did. It works great on the bench, but in practice I don't think it would
> be something you would want.
>
> 1st picture shows the gas tank sending unit with a vane out behind it.
> Level flight attitude, and the LED fuel gauge below it, upside down. Lots
> of bars in the green, then a yellow one and finally a red one up top.
>
> The next several pictures show a gradually increasing angle of attack,
> some of the green bars are out then a very high angle of attack, all you
> see is the yellow and red bars.
>
> Finally would be stalled, all you see is the red bar. Obviously you would
> need a lot of trial and error fiddling to adjust the linkage between the
> vane and the sender to correlate with the actual onset of the stall, but I
> think it could be made to work.
>
> The problem is in the gauge, it responds very slowly to changes from the
> sender. The LED's turn off and on at 2 or 3 second intervals. Move the vane
> abruptly and start counting: "One thousand one, one thousand two" - the
> first LED goes out. "One thousand three, one thousand four." - the 2nd LED
> goes out. And so on. In practice it is just too slow.
>
> But it was interesting to fool around with.
>
> --------
> Richard Pike
> Kolb MKIII N420P (420ldPoops)
> Kingsport, TN 3TN0
>
> Would you consider yourself to be a good person?
> https://www.youtube.com/watch?v=VWcDXT6pH7A
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=457184#457184
>
>
> Attachments:
>
> http://forums.matronics.com//files/p1050168_medium_107.jpg
> http://forums.matronics.com//files/p1050167_medium_166.jpg
> http://forums.matronics.com//files/p1050166_medium_265.jpg
> http://forums.matronics.com//files/p1050165_medium_482.jpg
> http://forums.matronics.com//files/p1050164_medium_809.jpg
>
>
--
*The older I get, the less tolerant I am of those who are intolerant of
others.*
*If you forward this email, or any part of it, please remove my email
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Message 3
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On Wed, Jun 15, 2016 at 4:08 PM, Richard Pike <thegreybaron@charter.net>
wrote:
>
> Earlier this spring the topic of AOA indicators was kicked around for a
> while and I ordered some items that I thought could be used to make one.
> Finally got around to cobbing together a workbench version just to see what
> it did. It works great on the bench, but in practice I don't think it would
> be something you would want.
>
> 1st picture shows the gas tank sending unit with a vane out behind it.
> Level flight attitude, and the LED fuel gauge below it, upside down. Lots
> of bars in the green, then a yellow one and finally a red one up top.
>
> The next several pictures show a gradually increasing angle of attack,
> some of the green bars are out then a very high angle of attack, all you
> see is the yellow and red bars.
>
> Finally would be stalled, all you see is the red bar. Obviously you would
> need a lot of trial and error fiddling to adjust the linkage between the
> vane and the sender to correlate with the actual onset of the stall, but I
> think it could be made to work.
>
> The problem is in the gauge, it responds very slowly to changes from the
> sender. The LED's turn off and on at 2 or 3 second intervals. Move the vane
> abruptly and start counting: "One thousand one, one thousand two" - the
> first LED goes out. "One thousand three, one thousand four." - the 2nd LED
> goes out. And so on. In practice it is just too slow.
>
> But it was interesting to fool around with.
>
> --------
> Richard Pike
> Kolb MKIII N420P (420ldPoops)
> Kingsport, TN 3TN0
>
> Ist thought: you used a fuel gauge. Any fuel gauge that's worth a flip as
a fuel gauge will display the exact behavior you saw. If you're bouncing
around in rough air (or more likely, a rough road) you don't want the gauge
alternately reading empty & full as you bounce across the potholes and
sweep around corners.
There's almost certainly an RC (resistor/capacitor) network inside the case
to average out the variations in voltage from the sender (which would
normally be a float-controlled resistor in your tank). It's likely that the
same LED ladder display can be found in power indicating meters for stereo
and/or public address amplifiers. The basic indicator is *much* faster than
your eye can follow.
Try again with an LED bar graph meter.
http://www.ebay.com/sch/i.html?_odkw=led+bar+graph&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.Xled+bar+graph+meter.TRS1&_nkw=led+bar+graph+meter&_sacat=0
I think you'll be much more impressed.
Charlie
Message 4
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Thank you Charlie!
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Would you consider yourself to be a good person?
https://www.youtube.com/watch?v=VWcDXT6pH7A
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457188#457188
Message 5
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On 6/15/2016 7:15 PM, Richard Pike wrote:
>
> Thank you Charlie!
>
> --------
> Richard Pike
> Kolb MKIII N420P (420ldPoops)
> Kingsport, TN 3TN0
Well, shucks. Now you've got me hoping I was right. :-)
Seriously, the display itself is easily capable of responding instantly,
so the mfgr must have done something to make it less sensitive to abrupt
changes.
You should be able to find a more suitable meter.
Charlie
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