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water ballast



 
 
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  #11  
Old July 14th 15, 05:23 PM posted to rec.aviation.soaring
Jim Lewis[_2_]
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Posts: 40
Default water ballast

Thank you Steve. I'll dig into the archive.
  #12  
Old July 14th 15, 07:35 PM posted to rec.aviation.soaring
Alexander Georgas[_2_]
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Default water ballast


The only time head or tail-wind affects inter-thermal speed or the need for
ballast is when the glide is to a fixed point on the ground, either a turn
point to be rounded before the next thermal is taken or a final glide to
landing.


....or when thermals are linked to ground features, such as when flying
above mountains which create energy lines
  #13  
Old July 14th 15, 09:13 PM posted to rec.aviation.soaring
Jim White[_3_]
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Posts: 286
Default water ballast

At 14:49 14 July 2015, Chris Rollings wrote:
Some of the confusion is caused by the fact that (at least some years ago
maybe not now, I don't know) the FAA written (on line) exam for a glide
pilot certificate required one to give the factually wrong answer to
question about inter-thermal speeds into and down-wind, in order to get

th
mark for the question. You had to answer that it was correct to fly

faste
between thermals when going into wind than when going down wind. This i
nonsense, but drawing the mistake to the attention of an FAA Inspector

onl
got his agreement and regret that he could do nothing about it.

The only time head or tail-wind affects inter-thermal speed or the need

fo
ballast is when the glide is to a fixed point on the ground, either a tur
point to be rounded before the next thermal is taken or a final glide t
landing.

Chris, you should perhaps read Brigliadori's Competing in Gliders. They
make a pretty convincing argument for flying a bit faster into wind between
thermals. Its in the appendices.

Jim

  #14  
Old July 15th 15, 01:00 AM posted to rec.aviation.soaring
Brad[_2_]
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Posts: 722
Default water ballast

so, I gotta ask....wonder what the public is going to think if/when they find out a bunch of guys in their expensive racing sailplanes fill them up with water just so they can fly faster,and then dump it out over the desert.

Brad
GK
  #15  
Old July 15th 15, 02:17 AM posted to rec.aviation.soaring
Paul Agnew
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Posts: 306
Default water ballast

Just tell them it's chemtrails.
  #16  
Old July 15th 15, 03:11 AM posted to rec.aviation.soaring
Dan Marotta
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Posts: 4,601
Default water ballast

Is that the same public that gets it panties in a bunch at the mere
thought of an SUV?

On 7/14/2015 6:00 PM, Brad wrote:
so, I gotta ask....wonder what the public is going to think if/when they find out a bunch of guys in their expensive racing sailplanes fill them up with water just so they can fly faster,and then dump it out over the desert.

Brad
GK


--
Dan Marotta

  #17  
Old July 15th 15, 01:43 PM posted to rec.aviation.soaring
Martin Gregorie[_5_]
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Posts: 1,224
Default water ballast

On Tue, 14 Jul 2015 17:00:30 -0700, Brad wrote:

so, I gotta ask....wonder what the public is going to think if/when they
find out a bunch of guys in their expensive racing sailplanes fill them
up with water just so they can fly faster,and then dump it out over the
desert.

Much the same as their reaction when they find out that Formula 1 racing
cars have a wooden plank strapped to the underside[*].
[*] actually its Jabroc, not just a simple lump of dead tree.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |
 




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