REFLECTOR: Runway length

[lawrence epstein]

Sorry-Meant "reverse"


>From: David Staten <Dastaten at earthlink.net>
>Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>Subject: Re: REFLECTOR: Runway length
>Date: Wed, 02 Aug 2006 17:20:06 -0500
>
>Beta is not reverse... and should not be confused as being synonymous
>with the concept of reverse thrust..
>
>Beta range, which is more descriptive of turbo-prop installations, is a
>pitch setting at anything less than used for flight.
>
>In turbo props, flight idle is the lowest power setting usually desired
>in flight, except in extenuating or emergency circumstances. However,
>since turboprops are governed to run at a fairly constant RPM and at the
>flight idle pitch setting, there may be enough thrust to cause
>acceleration on the ground and result in riding the brakes. Power/thrust
>is a result of increasing fuel flow to increase torque (and then
>increasing the pitch to use that torque).
>
>So for ground ops you lift the thrust lever up and over the flight idle
>stop and into the beta-range to allow adjustment of thrust on the
>ground. In the air, this power setting (if even permitted in flight by
>the type certificate) can result in extremely high descent rates
>(sometimes desireable, sometimes not).
>
>With piston power, simply pulling the engine back to an idle setting
>accomplishes the same effect if not more, than beta-range in a turboprop.
>
>Now.. reverse thrust (which you COULD consider a component of the beta
>range)... that might be nice to have.. but have to be careful not to FOD
>the engine or prop.
>
>Lawrence J. Epstein,MD wrote:
>
> > What we need are props that go to full “Beta”.
> >
> > LJE
> >
> >
> >
>
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