why horizontal wind change my vertical speed?
Thread Starter
Joined: Jan 2010
Posts: 37
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From: Los Angeles
why horizontal wind change my vertical speed?
When flying I notice the tail wind reduce my VS,if I keep my IAS,which make the descend difficult.But i think only vertical wind change the vertical speed,don't know how does it happen.
It is a stupid question ,thank you very much anyway!
It is a stupid question ,thank you very much anyway!
Joined: Jun 2001
Posts: 4,835
Likes: 85
From: Boldly going where no split infinitive has gone before..
A constant horizontal wind will not change your aerodynamic performance (ias, tas, V/s etc) for a given set of input parameters (power+attitude). I WILL change the angle of your descent relative to the ground, so to descend the same altitude in a given distance, you require a higher V/S.
A CHANGING horizontal wind WILL effect your ROD as it is an example of shear.
Winds usually abate with reducing altitude, so you usually have a reducing tail-wind as you descend. This is an example of a positive shear, and will reduce your V/s for a given power/ IAS.
A CHANGING horizontal wind WILL effect your ROD as it is an example of shear.
Winds usually abate with reducing altitude, so you usually have a reducing tail-wind as you descend. This is an example of a positive shear, and will reduce your V/s for a given power/ IAS.
Last edited by Wizofoz; 7th June 2013 at 07:16.
