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Old 03-22-2021, 01:56 PM
Chris Scott Chris Scott is offline
Join Date: Mar 2021
Location: Bowling Green Ky
Posts: 33
Default Slip with full flap

New member here. Returning to aviation after almost 20 years and am considering buying a used RV6/7.

Hypothetically ...

At 8000 feet my engine quits. All the normal restart procedures fail. I see a 2000 foot runway about 2 miles off.

So I head to my chosen approach area and begin a spiral, hoping to roll out on 1/2 mile final at 500 feet.

But, it turns into about 1000 feet agl and I'm just passing 85 mph - slowly bring on full flaps. Still gonna overshoot more than I want.

Can I aggressively slip with full flaps without fear of an exciting pitchover at low altitude?
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Old 03-22-2021, 01:59 PM
moosepileit moosepileit is offline
Join Date: Dec 2010
Location: Louisville, KY
Posts: 700

RV-6 and small vert/rudder, book deflections, yes.
RV-6, bought from builder.
O-320, slider, carb, mags, FP
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Old 03-22-2021, 02:07 PM
BobTurner BobTurner is offline
Join Date: Dec 2011
Location: Livermore, CA
Posts: 7,356

Yes. Stay away from stall speed.
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Old 03-22-2021, 02:20 PM
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Roadjunkie1 Roadjunkie1 is offline
Join Date: Jun 2017
Location: Erie, Colorado
Posts: 163
Default Slipping with flaps........

One of the items on my RV-4 Flight Testing Cards was, at altitude, to apply full flaps at flap/landing speeds, slow to approach speeds and slip her with full flaps, left and right (which is done in the Cub nearly every landing, at least one direction.....). At the control deflection that you would likely do on a final approach (I don't remember doing full control deflection as "normal" had the desired effect), I didn't find any untoward problems...and she wanted to come DOWN........ Again, I am very used to slipping as I was raised on Cubs........

If you slow them up on final approach, they will want to come down just with full flaps. When I'm out practicing engine-out approaches, I find more often than not, I need to work the flaps including retracting them to keep her on the "glide slope". My left hand is on the (manual) flap handle using them as another control. And, as my instructor used to say (on final): If you want to come down, pull back on the stick. Want to come down faster: pull back more. Knowing where your stall speed is, of course.....

And pulling back power with a controllable pitch prop can be like a speed brake as well.....

Flight-testing your new ride will tell you a lot as well......

RV-4 2860
1946 C-90-8 J-3 Cub
The adventure begins when things stop going as planned - Glen Heggstad
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Old 03-22-2021, 02:36 PM
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Mike S Mike S is online now
Senior Curmudgeon
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,850
Default Welcome to VAF

Originally Posted by Chris Scott View Post
New member here. Returning to aviation after almost 20 years
Chris, welcome aboard the good ship VAF

And, welcome back to the best hobby/activity in the world
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"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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Old 03-22-2021, 03:16 PM
swjohnsey swjohnsey is offline
Join Date: Nov 2018
Location: Kingsville, TX
Posts: 288

I had the same question. Slips with full flaps work great on the RV-4. Looks like the space shuttle coming in.
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Old 03-22-2021, 03:28 PM
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DanH DanH is online now
Join Date: Oct 2005
Location: 08A
Posts: 9,950

...but don't forget to select the uphill tank if you plan a long slip.
Dan Horton
Barrett IO-390
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Old 03-22-2021, 04:31 PM
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donaziza donaziza is offline
Join Date: Jun 2007
Location: Atlanta
Posts: 782

I slip my 8 all the time with full flaps. BUT--at least on "my" plane, it starts shuttering at 71 KIAS. (About 81.6 if you're in MPH) So I don't get slower than the 71 Kts obviously.
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Old 03-22-2021, 05:43 PM
swjohnsey swjohnsey is offline
Join Date: Nov 2018
Location: Kingsville, TX
Posts: 288

Originally Posted by DanH View Post
...but don't forget to select the uphill tank if you plan a long slip.
Never really thought about that!
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Old 03-22-2021, 06:30 PM
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Ed_Wischmeyer Ed_Wischmeyer is offline
Join Date: May 2005
Location: Savannah, GA
Posts: 1,430

The stricture against slipping with full slaps dates back to the Cessna 170, I believe -- and the very earliest models had a smaller vertical fin than the later ones.

It's my impression that the don't slip with full flaps advice once had merit but has since taken on a life of its own. That notwithstanding, the advice to try it at altitude is excellent advice.

I don't know, but I'd be cautious about spinning with full flaps. Potential for flap overspeed in the recovery, and potential for blanking the rudder. The Waco biplanes had trailing edge cutouts at the fuselage, and that was for spin recovery. I think...
RV-9A at KSAV (Savannah, GA; dual G3X Touch with autopilot, GTN650, GTX330ES, GDL52 ADSB-In)
Previously RV-4, RV-8, RV-8A, AirCam, Cessna 175
ATP CFII PhD, so I have no excuses when I screw up
Too many safety posts purged without notice...
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