Descend rate planning

[Olendirk]

hey guys,

wantedto know if you guys have some good rules of thumb concerning a descend planning with vertical speed. with a distance and a GS is there an easy way to calculate a vertical speed to maintain a 3° glide path?Any suggestiions welcome !


Thanks!


OD

[ali1]

Hi

To work out how high you should be on the G/S. Distance from t/d multiply by 3.

E.G Your at 8 miles on an ils, what height should you be at

8*3=24 so 2400ft

To work put your vs divide your groundspeed by 2

E.G At 100kts your ROD for 3 deg glide should be 500ft

100/2 = 50 then add a 0

Hope this helps

[scroggs]

Both the methods explained above are derived from the '1 in 60' rule, which should be a fundamental part of your training. Height required in feet = ((3 x distance) x 100), and rate of descent required (fpm) = GS x 5 both work perfectly even for a B747.

Scroggs

[BOZZATO]

May i recommend pc pilot?

It has a fantastic article written by Dave Barrington which contains a thorough explanation regarding manual descents!

Regards

Bozzato

[no sponsor]

As for distance to start descent, 3nm per 1000ft, + 3nm to slow down.

6000ft = 3*6=18 + 3 = 21nm.

In a jet, people tend to add 10nm to slow, rather than the 3nm for a piston (so I'm told).

[Olendirk]

Thanks guiys!

But wehre can i get this article?

Thanks!

OD

[CaptainPyro]

Looks like in the current issue of PC Pilot ...

http://shop.keypublishing.com/acatal...038.html#a1187
check your local magazine shop.. no not that one....

also read..

http://www.planeandpilotmag.com/cont.../descents.html

[ali1]

Mate,

Don't look to deeply into it otherwise you'll confuse yourself as said before.'3 times you're height plus a bit for good luck'. Can't go wrong bud.

Ali1