RE: [COUPERS-FLYIN] glide and stalls

[Ed Burkhead]

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Cyrus wrote:

Maybe this impression should be modified in the FAQs.  9 or 10 : 1 ratio would be better than a C150.

My problem with the 6:1 glide ratio is that I did careful measurements (albeit with an airspeed indicator with about a 15% error).  My computations showed a 12:1 ratio at the best glide speed of 80-85 mph and 8:1 at the worst gliding airspeed of about 63 (bad airspeed indicator).  Cut those numbers down by 15% and you sure don’t get 6:1 for best ratio.

 

I’d like to see several someones do RIGOROUS glide testing and we’ll work up the data.  Anyone interested should contact me and I’ll send you a procedure you can use.  (If I get time, I’ll write up the testing procedure and post it on my website next week).

 

Ed Burkhead

http://edburkhead.com/

ed -at- edburkheadQQQ.com   (change -at- and remove the QQQ)

 

 

-----Original Message-----
From: Dr. Cyrus Wood-Thomas [mailto:[EMAIL PROTECTED]
Sent: Wednesday, November 24, 2004 9:45 AM
To: Ercoupe Hangar Flying
Subject: [COUPERS-FLYIN] glide and stalls

 

 
----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
 
 

Ed said:  I do NOT believe the glide ratio (at best glide speed somewhere near 75 mph) is ANYWHERE near 6:1. I'm betting 9:1 or 10:1.
Ed Burkhead
Williams said:  At "best glide speed" the coupe has reasonable 
glide performance. At "minimum" speed some sink like a rock. William R. Bayne
Cyrus says:  thanks for clearing this up guys.  from reading the FAQs in the website I got the impression the coupe sank like Lake aircraft (due to the exposed engine up top, the wing floats, heavy weight of construction).  But they don't feel like they do.  It doesn't make sense that they should have a high sink rate. (besides 'high sink rates' are for people who build expensive kitchens!)  Maybe this impression should be modified in the FAQs.  9 or 10 : 1 ratio would be better than a C150.
Why did some planes get modified to have extra back elevator, on a spring loaded resistance device, so that the planes could be stalled?  when do you need to stall a coupe?  on landing?







Cyrus    

Dr. Cyrus Wood-Thomas D.C. 
Chiropractic Physician 
Diplomate of the National Board of Homeopathic Examiners
Past President of the Chiropractic Academy of Homeopathy
MDH Homeopathy, India
www.angelfire.com/az/CysWebSite

Tel: 928-925-0246 Long distance: 1-800-563-4095 
Mailing address: P.O. Box 3248  Prescott, AZ 86302

		
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