What's your "Napkin Math"?

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What's your "Napkin Math"?

Started by RayS, February 14, 2022, 03:23:29 PM

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RayS

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What's your "Napkin Math"?

February 14, 2022, 03:23:29 PM Last Edit: February 14, 2022, 03:25:41 PM by RayS

I've been flying the B1900 now since 2015 and have developed a small stack of napkins when I fly.

One of my favorites is the Top Of Descent Napkin calculator...

Given the following:
FL: 250
IAS: 250Kts
VS: -1000 (I always descend at this rate)
Tgt Alt: 0

In the Sporty's TOD Calc in my phone's E6B, this formula will give me a TOD of roughly 104nm out.

I usually round it to 100nm.

I use the numbers all the time and it's proven quite handy.

Interpolation is easy. If I'm at 13,000, TOD will be around 50NM, 6000ft: 25NM...

Would love to hear from the crowd if y'all have any mental napkin math....

Ray Sotkiewicz

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