Another way is to plan a 3 degree descent using trig. Two constants are all we need. For top of decent 318. For rate of descent 5.3. Top of descent. 5,500 - 1,200 = 4,300 4,300 / 318 = 13.5 nm Rate of descent uses ground speed but we can also assume calm winds aloft. 120 x 5.3 = 636 fpm. Because 318 and 5.3 are constants creating a simple lookup table eliminates all the math. For simple GA aircraft only a dozen incremented values are needed. This method makes it VERY easy to ballpark distance and rate. Top Of Descent 1,000 - 3.1 2,000 - 6.3 3,000 - 9.4 4,000 - 12.6 Etc Rate of Descent 60 - 318 70 - 372 80 - 425 90 - 478 Etc Or use the common rule of thumb of 3 and 5. 4,300 use 4.3 x 3 = 12.3 nm 120 x 5 = 600 fpm You descend a little late and flat however.
Another way is to plan a 3 degree descent using trig. Two constants are all we need. For top of decent 318. For rate of descent 5.3.
Top of descent. 5,500 - 1,200 = 4,300 4,300 / 318 = 13.5 nm
Rate of descent uses ground speed but we can also assume calm winds aloft. 120 x 5.3 = 636 fpm.
Because 318 and 5.3 are constants creating a simple lookup table eliminates all the math. For simple GA aircraft only a dozen incremented values are needed. This method makes it VERY easy to ballpark distance and rate.
Top Of Descent
1,000 - 3.1
2,000 - 6.3
3,000 - 9.4
4,000 - 12.6
Etc
Rate of Descent
60 - 318
70 - 372
80 - 425
90 - 478
Etc
Or use the common rule of thumb of 3 and 5.
4,300 use 4.3 x 3 = 12.3 nm
120 x 5 = 600 fpm
You descend a little late and flat however.
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Good lesson Cyndy. Thank you for posting these!
You've really helped me a lot during my ppl. My question is we're you've thought of IFR lessons too?
That was one great question you just answered for me thank you very much....
Thank you so much 👍😃
I love your videos ♥️
Great explaination !!
lol, 9/60 x 120 = 18.
You didn’t finish explaining anything what’s the point if you won’t finish