Flight planning winds aloft and Altitude question

iFly GPS Forum

We have a new Forum!  Go here to get started: https://adventurepilot.community.forum.  
The new forum is easier to use and much more capable than the old, we hope you will join our community! 

Below is a copy of the old forum. This will remain available for a short period so you can access and review the information contained here. To continue a conversation, or start a new one, please register and create a post at our new forum location.
HomeHomeDiscussionsDiscussionsiFly General Di...iFly General Di...Flight planning winds aloft and Altitude questionFlight planning winds aloft and Altitude question
Previous
 
Next
New Post
7/5/2019 12:43 PM
 

I really enjoy the flight planning and abiltiy to use the winds aloft to help choose flying altitudes.   But, I am wondering if IFly accounts for the speed gain of 2% per 1000' of Altitude into this?    I fly a turbocharged airplane and as a rule of thumb see 2kts per 1000' in altitude.   At 9500 I see 160KTS usually, 165KTS at 11,500 and 170KTS or better at 14,500 and so on.   Just trying to see if this extra speed is considered or if I need to work that into my decisions on what altitude to fly at.   If it is accounted for what speeds should be put into the aircraft cruising profile (sea level speeds, most common altitude speed, or a predetermined altitude speed the software prefers to see).    At 4500' the plane slows down to 150KTS.

 
New Post
7/5/2019 6:04 PM
 
I don't know the answer for sure, but I don't think iFly factors that in. I think it is simply your profile airspeed plus or minus the wind vector. I would put in the speed for the altitude you normally fly at.
 
New Post
7/6/2019 11:30 AM
 

I do believe you are correct.   I'm going to make profiles for various Altitudes and name them in a way I know what range of flight they are for.    I think this will give me a bit tighter numbers when flight planning, especially longer legs like 3 to 4 hours.

 
New Post
7/6/2019 12:44 PM
 
That's a good idea. You could do two for east bound altitudes and two for west bound altitudes and probably have it covered.
 
New Post
7/7/2019 10:45 AM
 
Bryan Herter wrote:

I really enjoy the flight planning and abiltiy to use the winds aloft to help choose flying altitudes.   But, I am wondering if IFly accounts for the speed gain of 2% per 1000' of Altitude into this?    I fly a turbocharged airplane and as a rule of thumb see 2kts per 1000' in altitude.   At 9500 I see 160KTS usually, 165KTS at 11,500 and 170KTS or better at 14,500 and so on.   Just trying to see if this extra speed is considered or if I need to work that into my decisions on what altitude to fly at.   If it is accounted for what speeds should be put into the aircraft cruising profile (sea level speeds, most common altitude speed, or a predetermined altitude speed the software prefers to see).    At 4500' the plane slows down to 150KTS.

As you stated, your only recourse to account for performance vs altitude is to create multiple profiles, given today's "Current Aircrafr Profile" tool.  Your post is clearly demonstrates the need to enhance the profile page.  Creating and storing multiple profiles for the same aircraft requires time investment by the user and adds redundant data to the database.  Altitude planning suffers because iFly can't use these multi profiles to interpolate since altitude planning is for a single aircraft profile.


Rusty IFR pilot. Liking iFly GPS.
 
Previous
 
Next
HomeHomeDiscussionsDiscussionsiFly General Di...iFly General Di...Flight planning winds aloft and Altitude questionFlight planning winds aloft and Altitude question