Vertical speed at touchdown

[Firstduck]

Hi,

 

my english ist noch the best, so I hope you unterstand my question.

 

I use the variable "03OC" in a Excel-VBA- project to get the vertical speed at touchdown.

In an other thread I read that the correct value for 59999 is -12,4 ft./min. No problem, because 59999/256 x3,2 / 60 is 12,4 ft./min.

 

In another flight I get the value 4294967036 and FSInterrogate converts it to -199,92 ft./min.

Now I am not able to calculate this result.

 

Can anyone give me an advice how to convert the values?

 

Thanks a lot

 

Andre

 

[Pete Dowson]

 I read that the correct value for 59999 is -12,4 ft./min. No problem, because 59999/256 x3,2 / 60 is 12,4 ft./min.

 

Actually 59999 is +12.4 not -12.4, meaning it was on the bounce up off the runway at the time it was recorded.

 

In another flight I get the value 4294967036 and FSInterrogate converts it to -199,92 ft./min.

Now I am not able to calculate this result.

 

 

 

You must read that offset as a SIGNED value. 4294967036 is actually hexadecimal FFFFFEFC which is the 32-bit representation of decimal -260. Using that will give you the -199.92 value.

 

Pete

[Firstduck]

Thanks Pete, now it works fine. :razz: