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Glide ratio for the 601HDS

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klaus(at)utdallas.edu
Guest

Posted: Tue Jul 11, 2006 11:29 am Post subject: Glide ratio for the 601HDS

Hi,



In the response to the glide ratio report for the 801 (it was about 

7:1), someone also mentioned a quote

**



"The 601/701/801 has the glide ratio of a grand piano!" 



**I do not know about the glide ratio of the 701 and 801, but for the 

601HDS a decent ratio can be

attained using wing root fairings. For my 601HDS such fairings have 

produced the following

for a reasonable total weight produced by pilot and passenger:



Power-off best glide (at) 1,020 lbs: 65 KIAS with 650 ft/min sink rate. 

This translates to

a glide ratio of 10:1. As a result, the plane comes in for landing much 

like a Cessna.



For details, see

http://www.utdallas.edu/~klaus/Airplane/airplane.html



Best wishes,



Klaus Truemper



-- 

Klaus Truemper

Professor Emeritus of Computer Science

University of Texas at Dallas

Erik Jonsson School of Engineering and

  Computer Science EC31

P.O. Box 830688

Richardson, TX 75083-0688

(972) 883-2712

klaus(at)utdallas.edu

www.utdallas.edu/~klaus

John Bolding

Joined: 23 May 2006
Posts: 281

Posted: Tue Jul 11, 2006 12:41 pm Post subject: Glide ratio for the 601HDS

One thing that I haven't seen mentioned in this thread is the difference in

glide between power off and engine stopped.

I got pretty good at power off landings in my RV3 and could coast to a stop

next to my hanger 3 out of 4 times but when the engine shelled out (yes,

it's true Mable ,them Lycomings break too) about a half mile from the

airport with plenty of altitude, I had to land on the road dodging

powerlines and cars. There is a LARGE difference in glide ratio.

John



 	  Quote: 	
		   "The 601/701/801 has the glide ratio of a grand piano!"

frank.hinde(at)hp.com
Guest

Posted: Tue Jul 11, 2006 12:58 pm Post subject: Glide ratio for the 601HDS

Ya landing engine out is not something I ever felt the desire to

practice...It might not fire up again if you get it wrong...



Frank

HDS 400 hours...SOLD thanks to barnstormers

RV7a paint...About 6 weeks from flight yahoo!



Do not archive 



--

Gig Giacona

Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA

Posted: Tue Jul 11, 2006 1:27 pm Post subject: Wing Root Fairing was Re: Glide ratio for the 601HDS

Klaus, add to that it just plain looks good. Quick question. Does the fairing cover any of the bottom of the wing or just the top half? Can't tell from the pictures.



 	  klaus(at)utdallas.edu wrote: 	
		  Hi,

For details, see

http://www.utdallas.edu/~klaus/Airplane/airplane.html

_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR

John Bolding

Joined: 23 May 2006
Posts: 281

Posted: Tue Jul 11, 2006 3:36 pm Post subject: Glide ratio for the 601HDS

 	  Quote: 	
		   

<frank.hinde(at)hp.com>
	


 	  Quote: 	
		  

 Ya landing engine out is not something I ever felt the desire to

 practice...It might not fire up again if you get it wrong...



 Frank

 HDS 400 hours...SOLD thanks to barnstormers

 RV7a paint...About 6 weeks from flight yahoo!



 Do not archive
	


Actually I wasn''t suggesting that anyone practice it (engine off), only be

aware that the parameters that someone learns while practicing idle power

landings are gonna be different from engine stopped, maybe a LOT,  they were

for me.

John

Jaybannist(at)cs.com
Guest

Posted: Tue Jul 11, 2006 4:51 pm Post subject: Glide ratio for the 601HDS

My dead stick landing experience was in a Cherokee 180.  The prop stopped because of a broken crankshaft.  This extended my glide so much that I misjudged the approach and had to make an abbreviated pattern before landing (on a paved runway).  I've always read that a windmilling prop created more drag than a stopped one.  Some have even suggested to try to stop a prop by stalling, to increase the glide.  That sounds kinda flakey to me, but to each his own.

 

 Jay in Dallas

 Do not archive

ch601xl(at)gmail.com
Guest

Posted: Tue Jul 11, 2006 5:14 pm Post subject: Glide ratio for the 601HDS

By slowing to a slower speed than best glide speed, you are increasing the rate of decent and losing precious altitude.



On 7/11/06,  Jaybannist(at)cs.com (Jaybannist(at)cs.com) <Jaybannist(at)cs.com (Jaybannist(at)cs.com)> wrote: 	  Quote: 	
		   My dead stick landing experience was in a Cherokee 180.  The prop stopped because of a broken crankshaft.  This extended my glide so much that I misjudged the approach and had to make an abbreviated pattern before landing (on a paved runway).  I've always read that a windmilling prop created more drag than a stopped one.  Some have even suggested to try to stop a prop by stalling, to increase the glide.  That sounds kinda flakey to me, but to each his own. 

 

 Jay in Dallas

 Do not archive  

	


-- 

Christopher W. E. Smith

fly1m1

http://ch-601xl.com

cffd(at)pgrb.com
Guest

Posted: Tue Jul 11, 2006 8:37 pm Post subject: Glide ratio for the 601HDS

A windmilling prop has more drag than one that is  stopped.  A Cessna 172 at about 1500 rpm is close to what a stopped prop  would be.  Taking your approach speed and using the prop pitch to compute  the no thrust rpm, you can get a feel of your glide with a stopped prop. Pitch  (inches) x RPM x 60/ (12 x 5280) = MPH, assumes 100% prop efficiency but good  for this case.

 Chuck D.

 N701TX

  

  

 ---

frank.hinde(at)hp.com
Guest

Posted: Wed Jul 12, 2006 6:32 am Post subject: Glide ratio for the 601HDS

Not flakey at all...I had a friend who through a blade on  his Acroduster..Nearly shook the engine right off the airplane...Stalling to  stop it is a great idea if your above a thousand feet and not over the middle of  a big city.

  

 Frank

Do not archive

   From: owner-zenith-list-server(at)matronics.com  [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of  Jaybannist(at)cs.com

Sent: Tuesday, July 11, 2006 5:46  PM

To: zenith-list(at)matronics.com

Subject: Re: Zenith-List:  Glide ratio for the 601HDS

 

My dead stick landing experience was in a  Cherokee 180.  The prop stopped because of a broken crankshaft.  This  extended my glide so much that I misjudged the approach and had to make an  abbreviated pattern before landing (on a paved runway).  I've always read  that a windmilling prop created more drag than a stopped one.  Some have  even suggested to try to stop a prop by stalling, to increase the glide.   That sounds kinda flakey to me, but to each his own.



Jay in Dallas

Do  not archive

frank.hinde(at)hp.com
Guest

Posted: Wed Jul 12, 2006 6:49 am Post subject: Glide ratio for the 601HDS

Klaus....Those wing root fairings look awesome...i slapped myself in the

forhead when I read your rationale and I can see why they worked so

well. I too have noticed the nose high attitude at high gross weight but

never made the connection with the angled fusealge.



And your right...On my new RV project the fuse sides are straight!



Goos job, thanks for sharing



Frank  



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