John Heddles
@john-heddles
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Joined: May 14, 2016
Last seen: Jun 12, 2026
Topics: 2 / Replies: 963
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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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1 year 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.

1 year 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...

1 year 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...

1 year ago
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Aerodynamics tutor

Where abouts are you located, specifically ?

1 year ago
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Navigation Workbook Magnetic Heading and Ground Speed on CR3

[color=blue]When you say "clones" is there a better device to get?[/color] First, does yours have a problem ? On the calc side, line up the outer...

1 year ago
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Navigation Workbook Magnetic Heading and Ground Speed on CR3

[color=blue]Now I am worried that my CR-3 is broken[/color] There doesn't look to be anything terribly wrong with your device. However, you have...

1 year ago
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