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03-19-2011, 10:38 AM
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Join Date: Aug 2009
Location: Newport, RI
Posts: 705
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Glide ratio RV-9A?
I had read in an earlier post that a 9a
pilot had done some glide testing with a shut down
engine. Apparently the glide speed with
the least amount of decent per min. Was 70 mph
at a sink rate of 400 feet per min.
Am I correct in calculating: 70/60min. =
1.166 miles per min x 5,280 ft/mile=6160 ft per min
divided by 400 ft/min = 15.4 ??
Is 15.4 to 1 glide ratio correct or in a safe ball park
for a 9a? Seems pretty high? Obviously many factors
are involved ie. Weight, altitude, pressure, etc.
Seems that by default 10/1 ratio as in C172. Seems to be used.
Does anyone have an accurate glide ratio for a 9a,
Say at max weight?
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03-19-2011, 11:10 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,408
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Quote:
Originally Posted by agirard7a
Apparently the glide speed with
the least amount of decent per min. was 70 mph
at a sink rate of 400 feet per min.
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Lowest sink rate per minute is not always the best way to look at it.
Lowest altitude lost for a given forward distance gained is pretty important.
This is one of those things glider pilots learn 
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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03-19-2011, 01:54 PM
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Join Date: Dec 2006
Location: Portland, OR
Posts: 827
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For best glide in the -9A I use around 80mph.
__________________
Long-EZ built 1985 -> Sold 2007
RV-9A; N539RV First Flight: 7/2010
RV-8A N468DL 40 hr Flight Test Program
Building Log: www.mykitlog.com/n539rv
APRS Tracking: aprs.fi/n539rv
2017 Paid 
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03-19-2011, 02:08 PM
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Join Date: Jan 2005
Posts: 3,642
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See the Cafe Foundation's report on the 9a. It's values are likely a lot more accurate than most of us can come up with. http://cafefoundation.org/v2/pdf_cafe_apr/rv-9a.pdf
__________________
Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto
Donation reminder: Jan. 2021
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03-19-2011, 06:09 PM
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Join Date: Jul 2010
Location: Sunriver, Oregon/Surprise, Arizona
Posts: 128
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Denied Access
I tried the link to CAFE but was denied access. I wonder how it new me? Site manager must have been the pilot in the C-172 I passed last weekend. Poor sport.
__________________
Fly safe,
Ken Day
Independence, OR
RV-9A O-360/CS - SOLD
RV-12 SOLD
AA1C 150HP - FLYING
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03-19-2011, 06:43 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by Sunriver Ken
I tried the link to CAFE but was denied access. I wonder how it new me? Site manager must have been the pilot in the C-172 I passed last weekend. Poor sport.
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Try this link and scroll down to the RV-9A.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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03-20-2011, 06:59 AM
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Join Date: Aug 2009
Location: Newport, RI
Posts: 705
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thanks
Thank you for the replies.
The Cafe report was excellent!
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03-20-2011, 07:52 AM
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Join Date: Dec 2010
Location: Alpharetta, GA
Posts: 88
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Heh. No RV-7 report. 
- John |
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