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03-17-2012, 01:28 PM
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Join Date: Jul 2010
Location: Sunriver, Oregon/Surprise, Arizona
Posts: 128
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Do These Airspeeds Look Correct?
Hi guys and gals,
I purchased a completed RV-9A and would like confirmation that the various speeds I was given by the builder are correct or at least close. Please look these over and let me know those you think are incorrect.
Vx (best rate) = 82 KIAS
Vy (best angle) = 77 KIAS
BEST GLIDE = 82 KIAS
Va (Maneuvering or Turbulent flight = 102KIAS
Vso (with flaps) = 44KIAS
Vs1 (clean) = 51 KIAS
Vfe (flaps) = 90KIAS
Vne (Never Exceed) = 182KTAS @ cruise
Vno (Max structural or maneuvering) = 117KIAS
__________________
Fly safe,
Ken Day
Independence, OR
RV-9A O-360/CS - SOLD
RV-12 SOLD
AA1C 150HP - FLYING
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03-17-2012, 02:07 PM
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Join Date: Dec 2005
Location: Andernos les Bains, France
Posts: 244
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From the manual in statute MPH
Hi Ken,
This is extracted from the build manual.
RV-9/9A AIRSPEED INDICATOR All speeds in statute MPH
Bottom of White Arc (approximate indicated stall speed with full flaps)
49
Top of White Arc(maximum speed with full flaps)
90
Bottom of Green Arc (approximate indicated stall speed without flaps)
56
Blue Line (Maneuvering speed. Maximum speed at which full control can be applied. Speed at which full elevator
control would impose loads exceeding limits)
118
Yellow Arc (caution range, to be flown only in calm or light turbulence conditions)
180-190
Red Line (never exceed speed)
210
Hope this helps
__________________
Daniel Mouly
VAF #778 - [2013 payment done]
RV-9A Emp. & Wings 95%, Fuse 70%
Austin Healey 3000 MKIII fully restored
LFCD (Andernos Les Bains), France
Construction Log comments in French (not really up to date, sorry)
Last edited by FlyingArcher : 03-17-2012 at 03:43 PM.
Reason: Highlight MPH
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03-17-2012, 02:48 PM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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MPH
I think Daniel's numbers are in MPH
Ahhhh - didn't notice the title of your post...
Last edited by Av8torTom : 03-17-2012 at 02:52 PM.
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03-17-2012, 10:43 PM
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Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
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Just to pick lint ...
My build manual numbers agree with Daniels, with the exception of Vfe, where mine says 86 mph, not 90. (4mph ... big deal.  )
__________________
Terry Ruprecht
RV-9A Tip-up; IO-320 D2A
S. James cowl/plenum
(Dues paid thru Nov '18)
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03-18-2012, 08:05 AM
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Join Date: Aug 2010
Location: Thunder Bay Ontario
Posts: 332
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Quote:
Originally Posted by Sunriver Ken
Vx (best rate) = 82 KIAS
Vy (best angle) = 77 KIAS
BEST GLIDE = 82 KIAS
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Vx should be slower than Vy.
Vglide should be close to Vy, closer than they are here. Perhaps Vx and Vy were switched by accident?
As stated before the rest of the numbers come out of the builder's manual.
__________________
RV-8
Empennage Passed Pre-close Inspection
Wings mostly done
Fuselage is "in the mail"
83126
Dash 8 day job is financing the RV-8
Donation till September 2021
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03-18-2012, 10:29 AM
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Join Date: Jan 2008
Location: KTCY
Posts: 643
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Quote:
Originally Posted by Sunriver Ken
Please look these over and let me know those you think are incorrect.
Vx (best rate) = 82 KIAS
Vy (best angle) = 77 KIAS
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These are backwards and we get a number closer to 72 KIAS for Vx
Vx (best angle) = 72 KIAS
Vy (best rate) = 82 KIAS
Vno (Max structural ) should be around 156 KIAS
Numbers on our Van's airspeed gauge.
Check out the V-N diagram here: "Why can't I use a larger engine?"
__________________
Dave & Trina
RV-9A Flying - 330 Hrs. Painted Finishing the interior.
Last edited by MauiLvrs : 03-18-2012 at 10:46 AM.
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03-18-2012, 07:34 PM
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Join Date: Jul 2010
Location: Sunriver, Oregon/Surprise, Arizona
Posts: 128
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Best angle/rate
Thanks guys. Is Vx best angle or best rate?
__________________
Fly safe,
Ken Day
Independence, OR
RV-9A O-360/CS - SOLD
RV-12 SOLD
AA1C 150HP - FLYING
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03-18-2012, 07:55 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by Sunriver Ken
Thanks guys. Is Vx best angle or best rate?
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Vx = best angle of climb
Vy = best rate of climb
__________________
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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03-19-2012, 06:34 AM
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Join Date: Oct 2008
Location: Utah
Posts: 8,144
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Vfe 80 knots on mine.
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03-19-2012, 07:56 AM
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Join Date: Jan 2005
Location: Victoria, Canada
Posts: 2,247
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VNE Never Exceed Speed 182 KTS
VNO Max Structural Cruise Speed 157 KTS
VA Maneuvering Speed 103 KTS
VFE Maximum Flap Extended Speed 78 KTS, 87 KTS/15?
VY Best Rate of Climb 85 KTS
VX Best Angle of Climb 72 KTS
VS Stall Speed Clean 49 KTS
VSO Stall Speed Landing Configuration 43 KTS
VG Best Glide Speed 82 KTS
__________________
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V e r n. ====
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RV-9A complete
Harmon Rocket complete
S-21 wings complete
Victoria, BC (Summer)
Chandler, Az (Winter)
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