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  #1  
Old 06-24-2019, 05:52 PM
akabud akabud is offline
 
Join Date: Jan 2019
Location: Galt, CA
Posts: 35
Default Another new RV-3A owner seeks V Speed info.

I guess Vans doesn't publish this info. I bought a set of preview plans thinking the info would be in there.
In section 15 of the manual there are speeds for 4,6,7 & 9 but not the RV-3.
So here's what I've put together from different sources in MPH. Stall speeds shown are what my plane indicates.
Correct me if I'm wrong.
Vso 54 MPH
Vs1 58
Vfe 100
Flaps 20° 120
Vx 85
Vy 125
Va 127
Vno 180
Vne 210
Best Glide 85 - 90
Final approach 70
Another question: has anyone got a clever way to latch the tip over canopy part way open while taxiing?
I've got an idea that I think will work but there might be some better ideas out there.

EDIT: From the input so far it looks like Va should be 134 and 20° flaps @ 120 is not valid.

Last edited by akabud : 06-25-2019 at 08:36 PM.
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  #2  
Old 06-24-2019, 07:53 PM
Mike S's Avatar
Mike S Mike S is offline
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 14,851
Default Welcome to VAF

Bud, welcome aboard the good ship VAF
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Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

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"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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  #3  
Old 06-24-2019, 09:14 PM
David Paule David Paule is online now
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 3,991
Default

Here's what I learned after pushing Van's support a bit:
http://www.vansairforce.com/communit...ad.php?t=13334

So in your data, there is no specified 20 degree flap speed other than the 100 mph limitation.

I think Va is 134 mph and the top of the green arc is 180 mph.

Vso will depend on the weight of the airplane at any moment. The 134 mph corresponds to a Vso of 55 mph, though.

Vx and Vy weren't given. Other RV-3 owners with the same engine, prop and weights might be able to give you a bit of data there.

I've seen a second set of holes for the latch tubes to go into in the panel for the taxi position slightly above the original hole.

Dave
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  #4  
Old 06-25-2019, 06:41 AM
wilddog wilddog is offline
 
Join Date: Feb 2008
Location: va.
Posts: 406
Default

Never seen the 120 mph flap speed, where did you find it? First notch of flaps at 120 would be very useful. Takes a while to slow to 100. My indicated stall speed is 62 mph flaps down and I suspect it reads high.
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  #5  
Old 06-25-2019, 08:29 AM
morganjohn24 morganjohn24 is offline
 
Join Date: Oct 2014
Location: College Station
Posts: 34
Default New RV 3A for Me Too

Stall testing showed 50-52 knots indicated at stall. I use 90 knots as flap speed, but even with a FP prop Iíve found itís not too bad to slow down. I approach at 65 knots with full flaps and power off unless gusty and add the smallest touch of power at flare to make the landing soft (although itís really not necessary I just donít trust my timing on flare yet).

On takeoff I push the tail up quickly (unless soft field) and accelerate until she wants to fly. From there, assuming no short field/obstacle, I accelerate to cruise climb in ground effect and cruise climb at 100-110 knots to keep CHTs down around 400 or less.

My -3A is a little on the heavy side (to be fixed soon) and has an IO 320 at 160 HP. Iíve inly flown 4 hours in her so this is all subject to change. Hope that helps as a data point!
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  #6  
Old 06-25-2019, 10:09 AM
akabud akabud is offline
 
Join Date: Jan 2019
Location: Galt, CA
Posts: 35
Default

Quote:
Originally Posted by David Paule View Post
Here's what I learned after pushing Van's support a bit:
http://www.vansairforce.com/communit...ad.php?t=13334

So in your data, there is no specified 20 degree flap speed other than the 100 mph limitation.

I think Va is 134 mph and the top of the green arc is 180 mph.

Vso will depend on the weight of the airplane at any moment. The 134 mph corresponds to a Vso of 55 mph, though.

Vx and Vy weren't given. Other RV-3 owners with the same engine, prop and weights might be able to give you a bit of data there.

I've seen a second set of holes for the latch tubes to go into in the panel for the taxi position slightly above the original hole.

Dave
Thanks for the info Dave. But your link doesn't work for me.
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  #7  
Old 06-25-2019, 10:22 AM
akabud akabud is offline
 
Join Date: Jan 2019
Location: Galt, CA
Posts: 35
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Quote:
Originally Posted by wilddog View Post
Never seen the 120 mph flap speed, where did you find it?
I found that on romeolima.com in his RV-3 POH
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  #8  
Old 06-25-2019, 02:18 PM
David Paule David Paule is online now
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 3,991
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Look for a thread titled "RV-3B Operating Limits," dated January 8, 2016, and authored by me. It's in teh RV-3 section here on VAF.

Dave
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  #9  
Old 06-25-2019, 08:38 PM
akabud akabud is offline
 
Join Date: Jan 2019
Location: Galt, CA
Posts: 35
Default

Quote:
Originally Posted by David Paule View Post
Look for a thread titled "RV-3B Operating Limits," dated January 8, 2016, and authored by me. It's in teh RV-3 section here on VAF.

Dave
Found it, thanks.
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