<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
>>
<< Greg Nelson wrote: Am I Wrong?
 Unless I am landing or taking off under extreme conditions (such as hot,
 humid, heavy,  
SNIP
............................................................

Greg, you did put most of the right caveats on your use of groundspeed as a
flight/performance reference. Groundspeed is needed to compute how long it
will take you from A to B, and indirectly how much fuel you will consume in
the process, but is not a valid measurement for any flight performance
characteristics about your airplane. Further, GPS groundspeed typically lags
the actual groundspeed when changing flight conditions due to the lag/buffers
intentionally built in the GPS computer. Admittedly, groundspeed approximates
the performance-driving airspeed values closely enough in most cases to be
used, but as I have personally observed, the "other 2% can kill you." and
more often than that mess up a perfectly good Lancair. I presume your
comments about these old terms were made at least partly in jest, but their
basis is valid and grounded (pun intended) in hard-learned lessons. While
groundspeed is probably the best in-flight/cruise reference for at least part
of your planning/use, consider using an airspeed reference for all other
flight operations.

Bob Pastusek

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>