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11-19-2012, 04:07 AM
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Join Date: May 2008
Location: Brisbane Qld. Aust.
Posts: 2,271
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best L/D ?
Has anyone really worked out the best L/D for an RV10? assume 2700lbs.
Just never seen it anywhere on the forum......... 
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David Brown
DYNON Authorised Dealer and Installer
The two best investments you can make, by any financial test, an EMS and APS!
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11-19-2012, 06:24 AM
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Join Date: Feb 2008
Location: Apache Junction, Az
Posts: 53
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See flight testing section of my web page for details.
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11-19-2012, 07:33 AM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,653
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It's a little hard to tell from that plot - what airspeed is that at? By the way, nice section on your testing, Mike.
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Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
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11-19-2012, 07:47 AM
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Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,167
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Very nice flat curve at the top. It looks like for practical purposes anything from 82 to 102 knots would put you very close to optimum. Does anyone have a similar chart for the RV6?
George
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11-19-2012, 08:48 AM
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Join Date: Jan 2009
Location: Salt Lake City, Utah
Posts: 554
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Thanks for sharing
Great info and nice work putting the charts together on your website.
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A&P RV-10 Flying 1000+ hours
SuperSTOL Flying 170 hours
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11-19-2012, 09:06 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Since the -3 degree setting appears to be more efficient over the whole speed range, is there any reason to ever use the zero degree setting?
Is controllability better with the zero setting?
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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11-19-2012, 12:09 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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One notch (0 degrees) of flaps will get you up off the runway a little sooner. Plane accelerates so well you do have to be careful to retract any flaps before exceeding flap down speed.
In my testing I came up with 87 kias for best glide, gross weight, with a likely error bar of plus or minus 5 knots. e.g., in agreement with the above plot.
Last edited by BobTurner : 11-19-2012 at 01:06 PM.
Reason: L/D numbers, typo
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11-19-2012, 12:31 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by BobTurner
One notch (0 degrees) of flaps will get you up off the runway a little sooner. Plane accelerates so well you do have to be careful to retract any flaps before exceeding flap down speed.
In my testing I came up with 87 kias for best glide, gross weight, with a likely error bar of plus or minus 5 knots. e.g., in agreement with the above plot?
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Does zero flaps count as flaps down?
Usually it does not...
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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11-19-2012, 12:58 PM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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Quote:
Originally Posted by az_gila
Does zero flaps count as flaps down?
Usually it does not...
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In the -10 I'd say yes simply because full "up" is the -3 deg reflex position and is the standard "no flap" position. The zero degree position just happens to be a defined position between full up and full down, no different terminology wise than say 15 deg. Confusion may arise from aircraft (eg Cessna's) where zero deg is the full up flap position and reflex is not an option.
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Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
Last edited by Auburntsts : 11-19-2012 at 01:01 PM.
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11-19-2012, 01:05 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Yes. Vans lists maximum speeds for the 3 standard flaps down positions, including the first one (0 deg).
The reason is structural; with flaps up (-3 deg) the flaps are against the aft spar. In other positions the forces which want to force the flaps up are carried by the flap push rod.
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