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A quick approximation is to divide your airspeed by 3 then multiply by 10 to get vertical speed. I.e 130 kts divided by 3 is a little over 40, say 43, multiply by 10 or, to keep it simple, just add a zero - 430 fpm. This also equates to approximately 3 degrees meaning, place the velocity vector in the hud somewhere around half way between the 0 and -5 degree pitch bars and you'll get the same result.

Using either method is also very useful for judging approach, as most are done on a -3 degree glide slope. A quick approximation is to divide your airspeed by 3 then multiply by 10 to get vertical speed. I.e 130 kts divided by 3 is a little over 40, say 43, multiply by 10 or, to keep it simple, just add a zero - 430 fpm. This also equates to approximately 3 degrees meaning, place the velocity vector in the hud somewhere around half way between the 0 and -5 degree pitch bars and you'll get the same result.

Using either method is also very useful for judging approach, as most are done on a -3 degree glide slope. Thanks FlaminSquirrel. A quick approximation is to divide your airspeed by 3 then multiply by 10 to get vertical speed.

I.e 130 kts divided by 3 is a little over 40, say 43, multiply by 10 or, to keep it simple, just add a zero - 430 fpm. This also equates to approximately 3 degrees meaning, place the velocity vector in the hud somewhere around half way between the 0 and -5 degree pitch bars and you'll get the same result. Using either method is also very useful for judging approach, as most are done on a -3 degree glide slope.

Squirrel, is your method just a way of approximating a 3 degree glideslope, like these? REL, in the manual, page 489: descend to the TACAN station location at a rate of approximately 1,200 to 1,500 ft/min on the ―VVI‖ indicator -300 feet for every mile traveled and maintain 200 – 250 KIAS. So in your case, maintain a speed of 200-250 KIAS, and maintain -1200 to -1500 fpm. Ground speed times ten divided by two is easy to calculate on the fly for a three degree glideslope. 160 knots gives 1600/2 = 800.

The 'true' figure is 850 fpm, so it's close enough for government work. You're going for 320/60 fpm per knot of groundspeed (320 feet per mile, GS/60 miles per minute). Times five, or 10/2 as per above, is only a few percent off. Ignoring the conversion to ground speed and using airspeed instead is usually very acceptable. At 5000 feet, the difference is only around eight percent (standard atmosphere). At A-10 approach speeds, you can also ignore all but extreme head/tailwinds.

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430 fpm isn't quite right for 130 knots. Back of an envelope gives me a 1.9 degree glide?

Typo on the factor three? Ground speed times ten divided by two is easy to calculate on the fly for a three degree glideslope. 160 knots gives 1600/2 = 800. The 'true' figure is 850 fpm, so it's close enough for government work. You're going for 320/60 fpm per knot of groundspeed (320 feet per mile, GS/60 miles per minute).

Times five, or 10/2 as per above, is only a few percent off. Ignoring the conversion to ground speed and using airspeed instead is usually very acceptable.

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At 5000 feet, the difference is only around eight percent (standard atmosphere). At A-10 approach speeds, you can also ignore all but extreme head/tailwinds. 430 fpm isn't quite right for 130 knots.

Back of an envelope gives me a 1.9 degree glide? Typo on the factor three? Yep you're right, it should be 2, my bad.