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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Fw: [FlyRotary] Re: Glide distances
Date: Mon, 13 Dec 2004 12:13:13 -0500
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Bob,  Just went back and looked up elevation of airport I deadsticked into
and its
> 979 ft so say 1000 ft above sea level.  Adding that to my calculation of
> 1137 would have given me 2137 ft AGL at arrival at the airport. That is
why
> I had the impression of having to lose quite a bit of altitude - its
because
> I had a bit to lose.
>
>  So at 750 fpm I could have glide another 2.85 minutes before running out
of
> altitude which at 85 mph  = 85*2.85/60 = 4 additional miles.  But, very
> happy to have arrived with that much altitude to lose.
>
> Ed
>
> ----- Original Message -----
> From: "Ed Anderson" <eanderson@carolina.rr.com>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Monday, December 13, 2004 11:54 AM
> Subject: Re: [FlyRotary] Re: Glide distances
>
>
> > Yes, Bob.  This was with the 2.17 gearbox and 68x72" prop.  The RV
> > reportedly has a glide ratio of 10:1.  So with 9500 MSL (actually about
> 7500
> > AGL), I should have been able to glide 10*7500 = 75,000 ft = 14.2 miles.
> > So at 14.2-12 Miles =2.2 miles at 87 mph = 2.2/87 =  .0252 hr =  1.5
> minutes
> > at 750 fpm (of course was not constant but mostly 750) = 1137 ft at the
> end
> > of my 12 mile glide at the airport.  So fairly close to my estimate of
> > altitude (also the airport may not have been 2000 above sea level.
> >
> > In anycase, even with a 10:1 glide ratio (or less) you can still have a
> fair
> > chance of finding a spot to set it down and walk away depending on
> altitude
> > of course.
> >
> > Ed Anderson
> >
> >
> > ----- Original Message -----
> > From: "Bob White" <bob@bob-white.com>
> > To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> > Sent: Monday, December 13, 2004 11:39 AM
> > Subject: [FlyRotary] Re: Glide distances
> >
> >
> > > Ed,
> > >
> > > That's excellent.  Your engine quits so you go into test pilot mode
and
> > > get all the data you can.  Glide is one advantage you RV guys will
have
> > > over me I think.  From what I've heard, the BD-4 glides a little
better
> > > than a rock with power off.  I've only got 2 hours flying time in it,
so
>
> > > I'm a little lite on first hand experience.  Hopefully soon.
> > >
> > > Was this before you upgraded to the "monster" prop?
> > >
> > > Bob White
> > >
> > > On Mon, 13 Dec 2004 10:47:45 -0500
> > > "Ed Anderson" <eanderson@carolina.rr.com> wrote:
> > >
> > > > On my 12 mile engine out glide, I punched up the NRST button on my
GPS
> > > > to find the two closest airfields were both 12 miles away (gulp!).
> > > > Since I knew I was going to be gliding around 85 mph that any sort
of
> > > > headwind would considerably shorten the glide.  Fortunately I had
been
> > > > paying attention to the wind direction as I was outrunning a cold
> > > > front, so turned 120 degs for the downwind field.
> > > >
> > > >   From 9500 MSL I arrived over the selected airfield with approx
> > > >   1500-2000 ft AGL.  I had altitude to do a 360 and a couple of hard
> > > >   "S" turns to loose altitude and even then came over the fence at
100
> > > >   mph.  This with a stubby wing RV-6A.
> > > >
> > > > I did have time in that 8 minute glide to find out that my best
glide
> > > > speed (at that weight)  was 87 MPH which produced a 750 fpm rate of
> > > > descent.  Any slower the rate went up and any faster the rate went
up.
> > > >  Also were I found what airspeeds the prop would stop at as well as
> > > >  what it took to get it going again.  So a rather productive 8
minutes
> > > >  all things considered {:>).
> > > >
> > > > Ed Anderson
> > >
> > >
> > > --
> > > http://www.bob-white.com
> > > N93BD - Rotary Powered BD-4 (soon)
> > >
> > > >>  Homepage:  http://www.flyrotary.com/
> > > >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> > >
> >
>