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#1
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TE probe up or down?
It's raining at the field today so here is a serious soaring question
to ponder: Should the end of the TE probe on the fin point up or down? Informal surveys at recent contests seem to show a slight preference for up (not counting those "swingers" that go both ways). I've heard all sorts of reasons why each orientation is best - angle of attack during pull-ups, airflow in front of the tail, G-effects on the air column, blah blah blah... I point mine up so I don't snag it when taking off the tail dolly! Comments? Kirk Wet in IL |
#2
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TE probe up or down?
On Sep 26, 3:13*pm, "kirk.stant" wrote:
It's raining at the field today so here is a serious soaring question to ponder: Should the end of the TE probe on the fin point up or down? Informal surveys at recent contests seem to show a slight preference for up (not counting those "swingers" that go both ways). I've heard all sorts of reasons why each orientation is best - angle of attack during pull-ups, airflow in front of the tail, G-effects on the air column, blah blah blah... I point mine up so I don't snag it when taking off the tail dolly! Comments? Kirk Wet in IL Up. as far awat from effects of the wing (and tail) as possible. Except on some sailplanes where down works better. See ya, Dave "YO electric" |
#3
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TE probe up or down?
On 26 Sep, 20:13, "kirk.stant" wrote:
It's raining at the field today so here is a serious soaring question to ponder: Should the end of the TE probe on the fin point up or down? Informal surveys at recent contests seem to show a slight preference for up (not counting those "swingers" that go both ways). I've heard all sorts of reasons why each orientation is best - angle of attack during pull-ups, airflow in front of the tail, G-effects on the air column, blah blah blah... I point mine up so I don't snag it when taking off the tail dolly! Comments? Kirk Wet in IL From Rudy Brozel's classic article on total energy: "The head of the probe should be as close as possible to the plane of symmetry of the horizontal tail plane. The smaller the vertical offset, the less the elevator affects the variometer. A vertical distance over half the depth of the horizontal tail plane is very bad!" http://www.nadler.com/sn10/Brozel_TE...n_20020510.pdf John Galloway |
#4
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TE probe up or down?
On Sep 26, 12:57*pm, johngalloway wrote:
On 26 Sep, 20:13, "kirk.stant" wrote: It's raining at the field today so here is a serious soaring question to ponder: Should the end of the TE probe on the fin point up or down? Informal surveys at recent contests seem to show a slight preference for up (not counting those "swingers" that go both ways). I've heard all sorts of reasons why each orientation is best - angle of attack during pull-ups, airflow in front of the tail, G-effects on the air column, blah blah blah... I point mine up so I don't snag it when taking off the tail dolly! Comments? Kirk Wet in IL From Rudy Brozel's classic article on total energy: "The head of the probe should be as close as possible to the plane of symmetry of the horizontal tail plane. The smaller the vertical offset, the less the elevator affects the variometer. A vertical distance over half the depth of the horizontal tail plane is very bad!" http://www.nadler.com/sn10/Brozel_TE...n_20020510.pdf John Galloway if I have mine up (which I prefer) it gets close to the plane the pitot tube is in..................would that possible disrupt the flow for the pitot? Brad |
#5
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TE probe up or down?
I point mine up so I don't snag it when taking off the tail dolly! I thought it best to point it whichever direction will keep it as perpendicular to the airstream it's reading from for as much of the flight regime as possible, in an attempt to keep the flow within +/-20deg to keep the probe from reading erroneously. Mine points down, and is really short too! I have a cruciform tail though, so I don't get probe envy since it's well clear of the bow wake of the tailplane. In fact I prefer it this way and well... at least my vario tells me size doesn't matter -Paul |
#6
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TE probe up or down?
On Sep 26, 12:13*pm, "kirk.stant" wrote:
It's raining at the field today so here is a serious soaring question to ponder: Why be so limited in your thinking? What's wrong with sideways? Then you can ponder which of those 2 options depending on you thermalling direction preference. I point mine up so I'm less likely to bend it. Andy |
#7
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TE probe up or down?
On Sep 26, 12:13*pm, "kirk.stant" wrote:
It's raining at the field today so here is a serious soaring question to ponder: Should the end of the TE probe on the fin point up or down? Informal surveys at recent contests seem to show a slight preference for up (not counting those "swingers" that go both ways). I've heard all sorts of reasons why each orientation is best - angle of attack during pull-ups, airflow in front of the tail, G-effects on the air column, blah blah blah... I point mine up so I don't snag it when taking off the tail dolly! Comments? Kirk Wet in IL DOWN |
#8
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TE probe up or down?
To state the obvious: Male pilots prefer up.
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#9
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TE probe up or down?
When I had a TE probe installed on my Ka-6E I ask Roger Frank the posting subject question. He responded immediately "it should be UP!! Otherwise some jerk will hang their hat on it."
Wayne HP-14 "6F" http://tinyurl.com/N990-6F "kirk.stant" wrote in message ... It's raining at the field today so here is a serious soaring question to ponder: Should the end of the TE probe on the fin point up or down? Informal surveys at recent contests seem to show a slight preference for up (not counting those "swingers" that go both ways). I've heard all sorts of reasons why each orientation is best - angle of attack during pull-ups, airflow in front of the tail, G-effects on the air column, blah blah blah... I point mine up so I don't snag it when taking off the tail dolly! Comments? Kirk Wet in IL |
#10
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TE probe up or down?
Opps, I ment to type "it should be DOWN!! Otherwise some jerk will hang their had on it."
"Wayne Paul" wrote in message ... When I had a TE probe installed on my Ka-6E I ask Roger Frank the posting subject question. He responded immediately "it should be UP!! Otherwise some jerk will hang their hat on it." Wayne HP-14 "6F" http://tinyurl.com/N990-6F "kirk.stant" wrote in message ... It's raining at the field today so here is a serious soaring question to ponder: Should the end of the TE probe on the fin point up or down? Informal surveys at recent contests seem to show a slight preference for up (not counting those "swingers" that go both ways). I've heard all sorts of reasons why each orientation is best - angle of attack during pull-ups, airflow in front of the tail, G-effects on the air column, blah blah blah... I point mine up so I don't snag it when taking off the tail dolly! Comments? Kirk Wet in IL |
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