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Daniel L. Lieberman
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 Posted: Sun May 09, 2004 5:29 pm Post subject: Eights-on-pylons - Distance between the Pylons |
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There are standard formulae for the pivotal altitude for eights-on-pylons.
The reference is 8083-3 which I cannot find online.
The formula shows an increase in pivotal altitude as a function of airspeed
squared. This makes sense since increased speed increases radius of turn
which would require an increase in altitude to maintain the point off the
wing. What I have not found is the distance between the pylons other than
statements [PTS} such as permits level flight between pylons or 3-5 seconds
between reference points.
What is the distance between the pylons supposed to be? Is this a function
of speed also?
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Roy Smith
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| Posted: Sun May 09, 2004 6:03 pm Post subject: Re: Eights-on-pylons - Distance between the Pylons |
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In article <RTtnc.15094297$Of.2517569 (AT) news (DOT) easynews.com>,
"Daniel L. Lieberman" <liebermandl (AT) hotmail (DOT) com> wrote:
| Quote: | There are standard formulae for the pivotal altitude for eights-on-pylons.
The reference is 8083-3 which I cannot find online.
The formula shows an increase in pivotal altitude as a function of airspeed
squared. This makes sense since increased speed increases radius of turn
which would require an increase in altitude to maintain the point off the
wing. What I have not found is the distance between the pylons other than
statements [PTS} such as permits level flight between pylons or 3-5 seconds
between reference points.
What is the distance between the pylons supposed to be? Is this a function
of speed also?
|
It should be obvious that the distance between the pylons has to be a
function of airspeed. Fly faster and you make bigger circles. Fly
faster and the straight-line segments between the turns are longer for
the same time interval.
In practice, for a typical 100-120 kt airplane you're likely to be
taking your commercial checkride in, something like 1/2 mile apart is a
reasonable starting point.
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