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  #1  
Old 11-19-2012, 04:07 AM
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RV10inOz RV10inOz is offline
 
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Location: Brisbane Qld. Aust.
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Default 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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  #2  
Old 11-19-2012, 06:24 AM
azcloudflyer azcloudflyer is offline
 
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See flight testing section of my web page for details.
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  #3  
Old 11-19-2012, 07:33 AM
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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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  #4  
Old 11-19-2012, 07:47 AM
sailvi767 sailvi767 is offline
 
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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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  #5  
Old 11-19-2012, 08:48 AM
Strasnuts Strasnuts is offline
 
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Default Thanks for sharing

Great info and nice work putting the charts together on your website.
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  #6  
Old 11-19-2012, 09:06 AM
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az_gila az_gila is offline
 
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Question

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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  #7  
Old 11-19-2012, 12:09 PM
BobTurner BobTurner is offline
 
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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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  #8  
Old 11-19-2012, 12:31 PM
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az_gila az_gila is offline
 
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Question

Quote:
Originally Posted by BobTurner View Post
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?
Does zero flaps count as flaps down?

Usually it does not...
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  #9  
Old 11-19-2012, 12:58 PM
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Auburntsts Auburntsts is offline
 
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Quote:
Originally Posted by az_gila View Post
Does zero flaps count as flaps down?

Usually it does not...
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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Last edited by Auburntsts : 11-19-2012 at 01:01 PM.
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  #10  
Old 11-19-2012, 01:05 PM
BobTurner BobTurner is offline
 
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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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