Newsgroups: rec.aviation.student
From: bobmoore@wwd.net (Robert Moore)
Subject: Re: Reverse Control vs Reverse Command
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In article <mmalloryF6vEvp.MnH@netcom.com>, mmallory@netcom.com (Mark Mallory) wrote:
>snowbird101@my-dejanews.com wrote:
>:    http://www.db.erau.edu/research/cruise/piston.frame.html
>
>: which as I recall also reaches the conclusion that Vbe is higher than
>: Vms, but seems to have a slightly different conclusion wrt the size
>: of the variation; are you familiar with his method, and for those of
>: us who won't see your forthcoming article could you possibly summarize
>: any differences in assumptions/conclusions?  (BTW he also concludes that
>: maximum range speed is higher than Vbg)
>
>The article is rather difficult to follow, but as far as I can tell he 
>claims that Vbg and Vmr (max range) are the SAME.  But there is an 
>obvious inconsistency in his definition of Vme (max endurance speed): at 
>one point he quotes "reference 2" which (without explanation) gives Vme 
>as equal to .83 Vmr, but he later gives "Vminpwr" as equal to .76 Vmr.  
>He gives no explanation as to why Best Endurance does *not* occur at the 
>point of Minimum Power.

Am I missing something??  Where is the discussion of  (L/D)max?  Are you
guys making up new V-speeds?  My "Aerodynamics for Naval Aviators" says
that the minimum angle of descent occurs at the speed for (L/D)max for the
weight.  No mention of Vbg, by-the-way, FAR 1 doesn't define Vbg either.
My aerodynamic texts also state that for "normal" a/c, the speed for minimum 
rate of descent occurs at approximately 75% of the speed for minimum angle
of descent.  Where did all of this Vbg, Vmr, Vminpwr stuff come from?

Bob Moore
ATP  B-707 B-727 L-188
CFIA CFII AGI IGI
PANAM (retired)


is approximately 75% of 
