Hi,

Apologies if this is in here somewhere but I can't find it. I'm trying to make a VFR flight plan for the C152 then load it into MSFS so I can pop up the MSFS navlog in VR. I loaded performance data into LNM for the C152, found it showed cruise at 103 and edited that to 107 to match MSFS but when I load the  PLN into MSFS it generates a navlog with one leg (still climbing) that it reckons will be done at 117knots. I have set wind speed to zero in MSFS. Is this just MSFS poor implementation or something I'm doing wrong please.

Phil 

2 hours ago, Spit40 said:

Apologies if this is in here somewhere but I can't find it. I'm trying to make a VFR flight plan for the C152 then load it into MSFS so I can pop up the MSFS navlog in VR. I loaded performance data into LNM for the C152, found it showed cruise at 103 and edited that to 107 to match MSFS but when I load the  PLN into MSFS it generates a navlog with one leg (still climbing) that it reckons will be done at 117knots. I have set wind speed to zero in MSFS. Is this just MSFS poor implementation or something I'm doing wrong please.

Hi Phil,

you're not doing something wrong. MSFS ignores the TOC and TOD points from LNM. Actually it ignores any altitude data attached to the flight plan waypoints. Also MSFS does not know about the speeds in LNM since it cannot read these from the flight plan files.

I'd modify the performance file until it matches your flying. You do this while flying. See https://www.littlenavmap.org/manuals/littlenavmap/release/2.6/en/AIRCRAFTPERFMERGE.html

103 to 107 is not a big difference in cruise speed. I suppose this a matter of having a second person on board or not.

Also keep in mind that LNM uses true airspeed in the performance profile.

Alex

 

2 hours ago, albar965 said:

Hi Phil,

you're not doing something wrong. MSFS ignores the TOC and TOD points from LNM. Actually it ignores any altitude data attached to the flight plan waypoints. Also MSFS does not know about the speeds in LNM since it cannot read these from the flight plan files.

I'd modify the performance file until it matches your flying. You do this while flying. See https://www.littlenavmap.org/manuals/littlenavmap/release/2.6/en/AIRCRAFTPERFMERGE.html

103 to 107 is not a big difference in cruise speed. I suppose this a matter of having a second person on board or not.

Also keep in mind that LNM uses true airspeed in the performance profile.

Alex

 

Thanks Alex. I’m starting to get my head around how it all works. Is it possible for me to edit the flight plan i’ve created via the point-and-click to say that i will cruise a leg at a specific speed and have that be exported to a file msfs can read? 
 

Phil

23 hours ago, Spit40 said:

Thanks Alex. I’m starting to get my head around how it all works. Is it possible for me to edit the flight plan i’ve created via the point-and-click to say that i will cruise a leg at a specific speed and have that be exported to a file msfs can read? 

You can create a plan, export it to MSFS PLN format and load it into MSFS. Cruise altitude is read by MSFS but the plan format cannot transport the speed. LNM and MSFS use different methods to calculate speeds. So you can only adapt the speed in the LNM aircraft performance to match the performance in the sim.

Alex