VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 07-20-2020, 03:50 PM
brogers brogers is offline
 
Join Date: Dec 2010
Location: VA
Posts: 24
Default Spinning an RV-7

Over the years I heard many opinions on spinning the RV-7. I conducted spins as part of the phase 1 flight testing (13 years ago) and occasionally through the years, but had never really explored this area in depth with the RV...... Until now. Having been an aerobatic instructor in the past, I had the desire to get proficient with spins again and try different recovery techniques to see how they worked in this airplane. I recorded some of my more recent flights to document the findings.

The first video is up and away working on flat spins. The spin starts with the typical with the power off stall, left rudder, right aileron, then add power once the spin is developed. The intent of splitting out the inputs and segments was to better quantify each ones affect on the aircraft. I purposely de-flattened the spin separately from spin recovery by first reducing power and centering the aileron and recovering with rudder and elevator after the spin steepened back up. That video can be found here.

https://vimeo.com/435352214

The second video was taken in an aerobatic box that had the appropriate waivers, observers, and utilizes a more aggressive recovery technique than the typical PARE. This was practiced many times at altitude to obtain consistent results prior to flying it in the box. DO NOT TRY THIS AT HOME.

Spin entry was initiated off of the back side of a humpty. Power was left at 24 squared and opposite aileron was added at the beginning of the spin entry. There were a total of 11 rotations, so the flat spin was fully developed prior to recovery. The power remained at 24 squared for the recovery and the recovery took about 3/4 of a rotation. Arresting the autorotation took ~ 260 ft and recovery from the dive took ~550 ft (total of 810 ft for recovery) with a moderate 2.5 to 3G pull. Descent rate during the spin stabilized at 5270 ft/min. That video can be found here.

https://vimeo.com/440092517

As usual, the typical caveats apply.
This is not instruction..... Just actual data to help us learn more about our specific aircrafts capability. Enjoy.

DO NOT TRY THIS WITHOUT PROPER INSTRUCTION FROM A QUALIFIED CFI.

Bill Rogers
Reply With Quote
  #2  
Old 07-20-2020, 08:05 PM
eddieseve eddieseve is offline
 
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 618
Default

Beautiful video, thanks for sharing

Cheers
__________________
Eddie Seve
Sydney Australia
First Flight 16th July 2012
RV-7 Phase 2, 30 Oct 2012
1100 hrs Feb 2020
Reply With Quote
  #3  
Old 07-21-2020, 08:17 AM
ronschreck's Avatar
ronschreck ronschreck is offline
 
Join Date: Mar 2006
Location: Gilbert, AZ
Posts: 1,719
Default A tad low on that recovery?

The ground under waivered airspace is just as hard as that outside of waivered airspace but observers would be helpful to locate the smoking hole.
__________________
Ron Schreck
RV-8, "Miss Izzy", 2250 Hours- Sold
My Aerobatic Video
My Formation Video
CAF B-25 - Airbase Arizona
VAF 2022 Donor
Reply With Quote
  #4  
Old 07-21-2020, 10:20 AM
sandifer sandifer is offline
 
Join Date: Jan 2007
Location: NC
Posts: 667
Default

I agree with Ron, what's the point? Power on flat spin recovery is standard stuff in acro planes, and the RV responds like any other. I've flown many a flight in that particular box, mostly good memories.
Reply With Quote
  #5  
Old 07-21-2020, 11:11 AM
Brantel's Avatar
Brantel Brantel is offline
 
Join Date: Mar 2006
Location: Newport, TN
Posts: 7,509
Default

Second one seems like a good way to become a negative statistic.
__________________
Brantel (Brian Chesteen),
Check out my RV-10 builder's BLOG
RV-10, #41942, N?????, Project Sold
---------------------------------------------------------------------
RV-7/TU, #72823, N159SB
Lyc. O-360 carbed, HARTZELL BA CS Prop, Dual P-MAGs, Dual Garmin G3X Touch
Track N159SB (KK4LIF)
Like EAA Chapter 1494 on Facebook
Reply With Quote
  #6  
Old 07-21-2020, 11:54 AM
brogers brogers is offline
 
Join Date: Dec 2010
Location: VA
Posts: 24
Default Spin recovery

I agree with each of you that the recovery from the second video was too low and I have rectified that behavior since then based on other mentoring. I do appreciate the feedback though as that breeds the appropriate safety culture.

When I researched spins in the -7, there were widely varying opinions on how well behaved it was and how much altitude recovery takes. My point was really just to quantify the aircraft capability in an area where I hadn't seen that done before. I figured if I was looking for the data and couldn't find it, there are others that may be looking for the same. I could be wrong about that though.

Bill
Reply With Quote
  #7  
Old 07-21-2020, 12:49 PM
odens_14 odens_14 is offline
 
Join Date: Jun 2007
Location: West Central, MN
Posts: 372
Thumbs up Great Attitude

Quote:
Originally Posted by brogers View Post
I agree with each of you that the recovery from the second video was too low and I have rectified that behavior since then based on other mentoring. I do appreciate the feedback though as that breeds the appropriate safety culture.
nothing to add, but I very much appreciate this response. I wish all pilots have the same attitude when "called out" for unsafe activity!
__________________
Chris Odens
West Central, Minnesota
RV-7
Reply With Quote
  #8  
Old 07-21-2020, 01:33 PM
mike newall's Avatar
mike newall mike newall is offline
 
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,338
Default

Take not thine altitude in vain, lest the ground shall arise and smite thee.....

Also - pity the poor airframe, that is harsh handling IMHO.

Having built 5 RV's, I have seen the hardware that holds the empennage on.

A dedicated aerobatic aeroplane is designed, built and inspected to do that. As Van himself says, these are not necessarily competition aerobatic machines, they are good all round sporting aeroplanes (I paraphrase).

But..... each to their own
__________________
"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q

Donated in 2021
Reply With Quote
  #9  
Old 07-21-2020, 02:16 PM
sandifer sandifer is offline
 
Join Date: Jan 2007
Location: NC
Posts: 667
Default

Quote:
Originally Posted by mike newall View Post
Having built 5 RV's, I have seen the hardware that holds the empennage on.

A dedicated aerobatic aeroplane is designed, built and inspected to do that. As Van himself says, these are not necessarily competition aerobatic machines, they are good all round sporting aeroplanes (I paraphrase).

But..... each to their own
Are we now concerned about RV tails coming apart from doing SPINS?
Reply With Quote
  #10  
Old 07-21-2020, 04:57 PM
ronschreck's Avatar
ronschreck ronschreck is offline
 
Join Date: Mar 2006
Location: Gilbert, AZ
Posts: 1,719
Default

Quote:
Originally Posted by sandifer View Post
Are we now concerned about RV tails coming apart from doing SPINS?
I have logged thousands of spins in my RV8 and find no adverse structural defects other than HS spar cracks corrected by recommended service bulletin. (Note: Spar cracks have been found on RVs that have never been exposed to aerobatics.) I DO check the torque on all empenage attachment bolts at every condition inspection.
__________________
Ron Schreck
RV-8, "Miss Izzy", 2250 Hours- Sold
My Aerobatic Video
My Formation Video
CAF B-25 - Airbase Arizona
VAF 2022 Donor
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 12:16 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.