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#1
February 27th 19, 10:21 PM
posted to rec.aviation.soaring
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high tow vs low tow
Yes!
Above the wake during a level (not climbing) tow, will place the glider quite a bit above the tow plane...not a good place to be... Low tow during level tow, just barely below the wake will place the glider only very slightly lower than the tow plane...a good place to be... So...anybody winning the argument yet? LOL Cookie Weird, because long cross country tows is exactly the one time the rest of us use low tow! The height difference between a good low tow and a good high tow isn't much anyway. Twenty feet / six metres maybe? Maybe less. 
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#2
February 28th 19, 01:03 AM
posted to rec.aviation.soaring
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high tow vs low tow
You do realise high and low refer to the slipstream don’t you!?
Speed of tow is the most important thing, I have not had so much flying in the USA but it is a problem at comps here when tug pilots used to towing slow two seaters and empty older gliders and turn up at a comp to tow heavily ballasted gliders. I understand there have been accidents over there from this. ASGs and JSs need more speed than 2-22s but some tug pilots cannot seem to see that! 
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#3
February 28th 19, 02:12 AM
posted to rec.aviation.soaring
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high tow vs low tow
I have always believed the wake basically goes DOWN behind the tow plane, being compressed, i.e. heavier, air, and/or maybe for other reasons. I don't remember feeling any wake turbulence just following the tow plane at the same height, climbing or level flight.
On Wednesday, February 27, 2019 at 2:21:01 PM UTC-8, Cookie wrote: Yes! Above the wake during a level (not climbing) tow, will place the glider quite a bit above the tow plane...not a good place to be... Low tow during level tow, just barely below the wake will place the glider only very slightly lower than the tow plane...a good place to be... So...anybody winning the argument yet? LOL Cookie
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#4
February 28th 19, 08:35 AM
posted to rec.aviation.soaring
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high tow vs low tow
On Wed, 27 Feb 2019 18:12:56 -0800, Tom BravoMike wrote:
I have always believed the wake basically goes DOWN behind the tow plane, being compressed, i.e. heavier, air, and/or maybe for other reasons. I don't remember feeling any wake turbulence just following the tow plane at the same height, climbing or level flight. Its caused by a wing generating lift. If you assume that the wake's downward angle is 1/3 of the wing's AOA you won't be far wrong. -- Martin | martin at Gregorie | gregorie dot org
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#5
February 28th 19, 10:04 AM
posted to rec.aviation.soaring
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high tow vs low tow
On Thursday, February 28, 2019 at 12:35:13 AM UTC-8, Martin Gregorie wrote:
On Wed, 27 Feb 2019 18:12:56 -0800, Tom BravoMike wrote: I have always believed the wake basically goes DOWN behind the tow plane, being compressed, i.e. heavier, air, and/or maybe for other reasons. I don't remember feeling any wake turbulence just following the tow plane at the same height, climbing or level flight. Its caused by a wing generating lift. If you assume that the wake's downward angle is 1/3 of the wing's AOA you won't be far wrong. So maybe 2 to 3 degrees from a towplane, a 1:20 to 1:30 slope, 2 or 3 metres at the end of a 60m towrope.
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#6
February 28th 19, 11:03 AM
posted to rec.aviation.soaring
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high tow vs low tow
What is the more controlling factor, is the tow plane is continuously climbing up and away from the wash. Leaving the wash behind if you will. At say 60 knots, and 10 knots climb..that is a 1 in 6 angle.....giving the glider pilot the impression that the wash is dropping...but really the glider and towplane are climbing compared to the wash. I've done many "level" (not climbing) tows. The wash essentially comes straight back. To fly outside of the wash, the glider must be either above the tow plane, or below it. Cookie reasons. I don't remember feeling any wake turbulence just following the tow plane at the same height, climbing or level flight. Its caused by a wing generating lift. If you assume that the wake's downward angle is 1/3 of the wing's AOA you won't be far wrong. -- Martin | martin at Gregorie | gregorie dot org
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