View Full Version : Descend rate planning
Olendirk
23rd Jan 2006, 11:11
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
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
23rd Jan 2006, 12:14
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
23rd Jan 2006, 17:23
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
23rd Jan 2006, 21:20
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
24th Jan 2006, 06:51
Thanks guiys!
But wehre can i get this article?
Thanks!
OD
CaptainPyro
27th Jan 2006, 10:36
Looks like in the current issue of PC Pilot ...
http://shop.keypublishing.com/acatalog/pc_pilot_issue_038.html#a1187
check your local magazine shop.. :eek:no not that one....:D
also read..
http://www.planeandpilotmag.com/content/2006/feb/descents.html
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