REFLECTOR: Reflector Digest, Vol 87, Issue 104
steve korney
s_korney at hotmail.com
Tue Jun 19 18:08:50 CDT 2012
John...
Your glide ratio was 5.4 on that return to base....Or less, depending on the altitude of the airport... I have to assume that you were at 2800 ft. AGL...
It doesn't make any difference what speed your gliding..It will change with weight and density altitude... Your L/D is what counts... Glide ratio is distance traveled divided by altitude lost...In any given time span...
Steve
Date: Tue, 19 Jun 2012 16:50:49 -0600
From: scott at tnstaafl.net
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Reflector Digest, Vol 87, Issue 104
That sounds way to exciting John!
-------- Original Message --------
Subject: Re: REFLECTOR: Reflector Digest, Vol 87, Issue 104
From: John Abraham <john at velocityaircraft.com>
To: 'Velocity Aircraft Owners and Builders list'
<reflector at tvbf.org>
Date: 06/19/2012 01:46 PM
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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