Steve,

 

The purpose of that article was to warn builders that over-powering (biggest engine possible) an aircraft can lead to exceeding some of the design parameters of the aircraft.  Most airplanes are designed such that Vne (as measured by airspeed) falls well within flutter and other destructive forces that could occur at some limiting max True (or Equivalent) airspeed.  This is certainly true of NA aircraft since the IAS at high altitudes, when converted to TAS, is usually nowhere near the Vne.  If the designer expected turbo charging or turbines to be used, that should have been taken into the Max IAS consideration. "Overpowering" might be a concern of those IVs that have been converted to Jet Props.  Ask the factory.

 

Uh, the terminal dive speed attainable by a Lancair may be another story.

 

Scott Krueger

 

Having coffee with some high time pilots this morning, the subject of Never Exceed Speed came up.  Before I read the original Van’s article years ago, I thought Indicated Airspeed was the indicator…  WRONG, it is True Airspeed.  Does your EFIS display TAS or do you have a table for reference?? 

 

http://www.vansaircraft.com/pdf/hp_limts.pdf 

 

Steve Colwell  Legacy