John Heddles
@john-heddles
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Joined: May 14, 2016
Last seen: Jul 31, 2026
Topics: 2 / Replies: 966
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Calculating Crosswind When MORE than 90 Degrees

You're trying to overthink things a bit, I fear. Doesn't matter whether you do the calculation using the AIP tables or mathematically, using the CR...

1 year ago
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Echo burn from Mains & CofG

Be aware, though, that Bob's booklet is fine but the CASA booklet carries the day in the exam and the latter doesn't fuss about the order of fuel load...

1 year ago
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CPL Performance.

More importantly, keep in mind that the material in the exams is quite dated. Back in the day, P charts in Australia were required to have various f...

1 year ago
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ETP, runway wind components, ETAS, rounding

[color=blue]When calculating back from the ETP to point A, which ground speed do I use when finding time? Is it ground speed on or ground speed home?[...

1 year ago
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Choosing a map/ground feature for ground speed check

You're missing the point behind the book's recommendation. I suggest that there is naught wrong with your thought processes. If you are looking f...

1 year ago
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Algebraic formula for Echo Forward L

Not entirely sure that I understand what your concern is. Your formulae are OK. [color=blue]the amount to add, offload or unload[/color] Thes...

1 year ago
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10%

[color=blue]If say, I subtract 10% from 165 I am left with 148.5. 10% being 16.5.[/color] That's fine and quite correct ........ but it has absolut...

1 year ago
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Is ETAS critical in CPFA?

Will, That's a Dalton. Originally designed (in several forms) by Philip Dalton in the US in the mid-30s. After the patents expired, every ma...

1 year ago
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Is ETAS critical in CPFA?

First, if you are using an E6B (Dalton), ETAS is absolutely irrelevant as the Dalton solves the wind triangle purely graphically. This process makes...

1 year ago
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Calculating track change

Kejt It really would help out if you drew a mud map sketch. That is far easier than trying to interpret a text description of whatever ....

1 year ago
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CPL performance exam 2 Q1

I'll leave working the example unless you have continuing problems with it. I will presume that Wayne's calculations are appropriate. Some observ...

1 year ago
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2 years ago
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Need urgent answer please for a CPL Performance Aeroplane question

Try this link and download MOS Part 139 which has all the good gen. If you download the pdf file the section of interest is around p130.

2 years ago
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Any advice about materials brought to the RPL exam?

Yingzhou, Most of the references you will read provide simple numerical calculation sequences but in reverse order to how one does the basic sums a...

2 years ago
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Navigation Workbook Magnetic Heading and Ground Speed on CR3

[color=blue]186 is the track yes - apologies used the wrong term[/color] All OK. [color=blue]TC - True Course[/color] That's US-speak for ou...

2 years ago
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