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  #1  
Old 06-01-2016, 08:31 AM
TimO TimO is offline
 
Join Date: Feb 2005
Location: Wisconsin
Posts: 612
Default Spins in the RV-14

One topic I haven't seen addressed (maybe I missed it?) on the RV-14 forum is spin testing the RV-14. I know with the RV-10 we were advised against spins, but they did spin chute testing and found that the RV-10 perhaps wasn't a good candidate to spin due to some issues.
What about the RV-14? Is it safe to assume that being an aerobatic capable plane, with a large rudder that this one has been tested and should recover nicely? It won't be too long and I'll be flight testing mine, and this would be something worth wasting an hour of that flyoff time on...
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RV-10 N104CD - Flying 2/2006 - 1400+ hours http://www.MyRV10.com
RV-14 N14YT - Flying 6/2016 - 350+ hours http://www.MyRV14.com
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  #2  
Old 08-15-2016, 01:58 PM
TimO TimO is offline
 
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Location: Wisconsin
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Default

I never did get any replies on this, but was able to go out and complete a brief spin in the -14. It recovered very quickly, although as I said it was brief. Less than 1 turn. If anyone has the opportunity to spin one more, I'd love to hear your comments.
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RV-10 N104CD - Flying 2/2006 - 1400+ hours http://www.MyRV10.com
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  #3  
Old 08-15-2016, 02:41 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
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Default

Quote:
Originally Posted by TimO View Post
I know with the RV-10 we were advised against spins, but they did spin chute testing and found that the RV-10 perhaps wasn't a good candidate to spin due to some issues.
n...
Although Vans was under no legal obligation to do so, I believe they were showing that the -10 met the certification rules wrt spins that apply to normally certified aircraft. e.g., recoverable up to 3 turns, but not recommended (not approved in the certified world) as the airframe g loads are limited to normal catagory standards.
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  #4  
Old 08-15-2016, 09:34 PM
TimO TimO is offline
 
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Location: Wisconsin
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Bob,

Yes, on the -10 they did talk about it. The thing is, on the RV-14 I heard nothing about the results of any spin testing. I would think that such info would be made public in the interest of safety?
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RV-10 N104CD - Flying 2/2006 - 1400+ hours http://www.MyRV10.com
RV-14 N14YT - Flying 6/2016 - 350+ hours http://www.MyRV14.com
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  #5  
Old 08-15-2016, 09:53 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by TimO View Post
Bob,

Yes, on the -10 they did talk about it. The thing is, on the RV-14 I heard nothing about the results of any spin testing. I would think that such info would be made public in the interest of safety?
The same level of "talked about it" that was done with the RV-10 has also been done with the RV-14.

It was fully spin tested (with a spin recovery chute attached) by a professional contracted test pilot.

Results were similar to the other aerobatic side by side airplanes, and the same cautions that are recommended for the other side by side airplanes are recommended for the RV-14. Primarily, recreational spins beyond are turn or so are not recommended because the higher rate of rotation that develops beyond just a couple turns will likely surprise and possibly even panic an uninitiated pilot.
As for the RV-10 having a recommendation of no spins because of "issues".... that is not from any of Van's talk, so I am not sure where that came from.
The RV-10 is not approved for aerobatics. An airplane not approved for aerobatics has entirely different requirements regarding spin recovery, so that not recommended statement should not be construed to "issues" with the RV-10, any more than "not recommended" is for any non aerobatic certificated airplane.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")

Last edited by rvbuilder2002 : 08-15-2016 at 09:59 PM.
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  #6  
Old 08-16-2016, 12:37 PM
TimO TimO is offline
 
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Location: Wisconsin
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Thanks Scott,
That fills in the blanks for me on the RV-14. It does seem like it will be no problem to recover from spins with standard input. For the RV-10 I'm not interested in trying.
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RV-10 N104CD - Flying 2/2006 - 1400+ hours http://www.MyRV10.com
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  #7  
Old 08-16-2016, 01:59 PM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
Posts: 323
Default spins

Scott,

Thanks for the clarification re -14 spins. Just wondering if there's any reason beyond being "surprised" why the spins shouldn't be extended beyond 1 turn.

Is the recovery method and time to recovery any different after 6 turns than after just 1 turn?
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  #8  
Old 08-16-2016, 02:28 PM
jrs14855 jrs14855 is offline
 
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,393
Default Spins

This is generic information that applies to most aircraft that are approved for spins. At one turn the spin is still in the incipient stage. It will take somewhere between 1 and 3 turns for a normal power off spin to stabilize in rotation rate.
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  #9  
Old 08-16-2016, 02:30 PM
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swisseagle swisseagle is offline
 
Join Date: Feb 2005
Location: 20km outside of Zurich, Switzerland
Posts: 468
Default The spin will speed up!

Hello Jake

The point is, that after the first revolution, the rotation speed will increase. The scenery that "flow" in front of you will getting faster and it will be more and more difficult to recognize things and count the revolutions. It is likely that if you are untraind to spins, you getting more and more trouble and difficulties to realize the situation and counteract.

In the plane I flew in the past, a Slingsby Firefly, the speed after the first revolution was heavily increasing. Iy youd like to stop it at three rotations, you start with the inputs at 2 1/4. If you where going up to 4, it will need a full revolution with opposit rudder to get it stopped.

Also the vertical speed will increase in the first revolutions quite a bit.

Get trainings in a known plane with someone that has the qualification to perform this!

In the Slingsby once I had difficulties to get out of a righthand spin (we mostly do the lefthand), it was only one and a half revolution more that I wanted ... but it felt like it will never stop ... and shocked me quite a bit!
I could not find out what was wrong, I just got back and picked up my aerobatic teacher to train it again with him.

Fly safe!
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  #10  
Old 08-16-2016, 04:21 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Location: Hubbard Oregon
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Quote:
Originally Posted by Jake14 View Post
Scott,

Thanks for the clarification re -14 spins. Just wondering if there's any reason beyond being "surprised" why the spins shouldn't be extended beyond 1 turn.

Is the recovery method and time to recovery any different after 6 turns than after just 1 turn?
Recovery method is standard procedures regardless of number of turns, but as already mentioned, the more turns (or fractions of) you do before recovery, the faster the rotation rate.
The faster the rotation rate... the longer the recovery time.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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