REFLECTOR: Reflector Digest, Vol 87, Issue 104

[John Abraham]

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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