REFLECTOR: Reflector Digest, Vol 87, Issue 104

[Mark Magee]

Hi John,
What was your speed, do you recall?
Is Glide Ratio similar for XLFG as to XLRG gear up?

Mark

On Tue, Jun 19, 2012 at 2:46 PM, John Abraham <john at velocityaircraft.com>wrote:

> You should see around 15:1 +/- for building variations with a zero thrust
> setting and gear up.  I have done a 2.5-2.75 NM glide from 2800 feet back
> to the runway with a windmilling propeller on an XL before.  (yes engine
> was out so no additional thrust)  best glide airspeed is 85KCAS at gross.
> So L/D will decrease if you are lighter slightly. We cleared the fence by
> about 5’ or so.  ****
>
> ** **
>
>                       John ****
>
> ** **
>
> *From:* reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] *On
> Behalf Of *Mark Magee
> *Sent:* Tuesday, June 19, 2012 2:56 PM
>
> *To:* Velocity Aircraft Owners and Builders list
> *Subject:* Re: REFLECTOR: Reflector Digest, Vol 87, Issue 104****
>
> ** **
>
> I don't have the manual here at work, is the XLFG a 12 to 1 glide ratio
> with a stopped prop?
>
> Old Long EZ glided 20 to1 on a stopped prop.
> I told myself I'd never fly the heavies... :(
> Mark Magee****
>
> On Tue, Jun 19, 2012 at 12:44 PM, Brooke Wolf <bwolf1 at tds.net> wrote:****
>
> Steve….Just to be clear, do you mean 9.5 to 1, i.e., 9500 feet forward for
> every 1000 ft altitude loss?  It looks like mine is nearer 8.5 to 1.
>  Somehow, somewhere I got the idea it would be 15 to 1!  Maybe that is with
> a stopped prop.  ****
>
> ** **
>
> Brooke****
>
> ** **
>
> ** **
>
> ** **
>
>
>
> ****
>
> *From: *steve korney <s_korney at hotmail.com>****
>
> *Subject: **Re: REFLECTOR: Gliding Distance*****
>
> *Date: *June 19, 2012 1:13:22 PM EDT****
>
> *To: *Reflector Reflector <reflector at tvbf.org>****
>
> *Reply-To: *Velocity Aircraft Owners and Builders list <reflector at tvbf.org
> >****
>
> ** **
>
>
> At 85 KIAS @ 6000ft , you have about a 9.5 glide ratio.... What are you
> expecting to see....?
>
>
> Steve ****
>
> > From: bwolf1 at tds.net
> > Date: Tue, 19 Jun 2012 12:26:23 -0400
> > To: reflector at tvbf.org
> > Subject: REFLECTOR: Gliding Distance
> >
> > I am planning some overwater trips in the near future and the subject of
> gliding distance naturally comes to mind. I have done some limited test
> flying with my airplane (XLRG w/Aerocomposite variable pitch prop). The
> results of my gliding performance are not too good. All tests were done
> around 6000ft with throttle at idle and wheels up. Here are the results:
> >
> > 80 KIAS - 900fpm…….. yields a glide performance of 1.38 miles/1000 ft
> altitude
> > 85 KIAS - 1000fpm……..yeilds a glide performance of 1.41 miles/1000 ft
> altitude
> > 100 KIAS - 1250fpm …..yields a glide performance of 1.34 miles/1000 ft
> altitude
> >
> > As you can see, 85 KIAS appears to be the best glide speed.
> >
> > I know there may be a big difference in what I tested and what happens
> in the real world with a windmilling or stopped prop. Have any of you brave
> test pilots done any testing with a windmilling or stopped prop? What were
> the results? What kind of glide performance did others get with throttle at
> idle? Is there anyway to correlate throttle idle glide performance with
> windmilling or prop stopped performance? What is the best way to stretch a
> wheels up glide on a Velocity?
> >
> > I would like to get a discussion going on this and find what others have
> experienced. Thanks.
> >
> > Brooke, N108BG, XLRG-5, 145 hours
> >
> >
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