Fsbuild-2 Flight Planner

Hi Ernie,

I've been using FSBuild2 for a good long while now, and I love it to bits! But I have one problem with it that I think have been there all along, although it took me a good long while to figure out why my time and fuel calculations were always off: It seems to be inaccurate in calculating the distances between waypoints.

To illustrate, consider this routing: FACT IMSOM UQ36 APKIN UL224 MRC SBGL. Let us consider the distance from IMSOM to MRC. FSBuild 2.2 claims the distance is 3190 nm, whereas all other flightplanners I compare it with (Flight Manager, Route Finder and so on) all say it's 3234 - 3235 nm. With a route reserve allowance of down to 3% in some cases, the 1.4% difference above is not at all insignificant! It means that a substantial part of my cruise reserve is used up by the inaccurate flightplanning... It also makes it inconvenient to use the FSBuild flightplans for my 'howgozit' in cruise as you can be flying faster than the planned groundspeed and still have longer than planned time between waypoints, since the waypoints are actually further apart than FSBuild thinks they are...

The above example is just an illustration; this problem occurs on all my FSBuild flightplans.

Am I the only one with this problem? Is there something wrong on my end, some setting etc? And is there anything that can be done about it?

_________________
Best,
- Björn

Björn,

How do you know that it is FSBuild that is wrong?

What is a "route reserve allowance"? If this is a fuel reserve, then I don't think I will be flying with your airline thanks. As wind is such a variable, and other delays, cutting it that fine is not safe.

Bresides, I get that distance to 3211, which compared to "the correct" value of 3234, which is 0.7%.

Steve

_________________
Best,
- Björn

Steve, look...

The example I gave is not what I base this on; it is provided as aan easily reproduced example so that Ernie (didn't think anyone else would be interested) can check for himself whether there is anything wrong there or not. I have known for a year that the FSBuild output I get is wrong, as it is indeed very apparent when you are trying to keep an accurate howgozit. I have repeatedly verified it, as since I started suspecting FSB distances were wrong I have routinely used other flightplanners to give the total trip distance for use when I calculate the total trip fuel (I use the flight planning tables and diagrams for fuel uplift determination, not FSB or any other planner), and the FSBuild values are always too low in comparison; not sometimes, but every single time. I can see it on every leg of every flight; if the FSB plan says I should be going 480 kts G/S and take 14 mins, and I'm actually doing 500 kts G/S but still take 15 mins, then something is obviously very wrong. But FSBuild is better than those others for generating the 'master flightplan' used for comparison in-flight, so I'd rather FSB was accurate as well. I am really amazed if nobody else has noticed it, which is why I was hoping it is something wrong on my end (country settings or what-not).

Only after checking and verifying all those things, do I take it to the forum here to see if it can be resolved, thinking Ernie might be interested in checking it out. I don't need any further "evidence", as I have plenty already, but never mind that; rather, go check for yourself...

_________________
Best,
- Björn

_________________
Best,
- Björn