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01-08-2013, 06:58 AM
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Join Date: Aug 2005
Location: Raleigh, NC
Posts: 113
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Quote:
Originally Posted by Toobuilder
As it is made of the same material as the RV-8, and I have had quail come completely through mine, I can say with almost certainty that a bird of this size will (to quote Dirty Harry) "...take your head clean off".
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... And I can tell you from first hand experience that a red tailed hawk (~3lbs) at 120kts will go straight through a RV-7 canopy without any trouble. After shattering the canopy it still had enough energy to bend the steel support tube going up to the roll bar.
RV canopies don't stand a chance against a large bird like a Turkey vulture (~6lbs) or goose (~20lbs).
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Greg
RV-7
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01-08-2013, 07:26 AM
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Join Date: Oct 2009
Location: Victoria, BC, Canada
Posts: 3,932
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Quote:
Originally Posted by Av8torTom
Just goes to show how little Bernoulli's principle contributes to lift...
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Just goes to show how little people understand physics... 
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Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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01-08-2013, 08:12 AM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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Quote:
Originally Posted by Snowflake
Just goes to show how little people understand physics... 
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Was waiting for someone to bite on that...
It's an interesting debate... in reality - depending on the wing of course, Bernoulli's Principle contributes about 10% to the total lift of the wing*. Take a look at the upper surface of the wing in those pictures and it's hard to imagine a clean boundry layer of airflow could exist over the top. Dan hasn't commented yet on how difficult it was to control the airplane after that amount of damage, but the pilot certainly got it safely on the ground. I think we under estimate how much lift is generated from air hitting the underside of the wing producing an upward force. Stick your hand outside the window of a moving car and you can demonstrate this. There are plenty of airplanes with symmetrical wings that fly very well - even upside down. A lot has to do with AOA, but there are many other forces at play too.
I often think of those 25 cent (OK, I'm dating myself) balsa airplanes with the flat wings, and how nicely they fly...
* - This from the Boeing engineer who designed the wing on the 787. Actually his comment to me was "Tom - don't tell anyone, but we really have NO idea how a wing flys..."
Last edited by Av8torTom : 01-08-2013 at 08:33 AM.
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01-08-2013, 08:27 AM
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Join Date: Jan 2006
Location: New Smyrna Beach, FL
Posts: 1,339
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I've had more near misses with vultures the past couple of weeks than I can ever remember. Sobering photos.......................
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David Maib
RV-10 N380DM
New Smyrna Beach, FL
VAF Paid 1/21/2020
"In '69 I was 21, and I called the road my own"
Jackson Browne
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01-08-2013, 09:57 AM
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Join Date: Dec 2010
Location: Doncaster England
Posts: 57
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Quote:
Originally Posted by Silent_Flyer
Impressive damage.. Is anyone aware of a bird strike to the canopy in an RV-4?
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Not great results!
Couple of threads on the forum about Birds Strikes on RV-8 plexy. A bird strike on any canopy would spoil your day, and one of the reasons why the Military wear head gear!
It?s the only time Dick Dasterdly wouldn?t want to catch a pigeon !

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01-08-2013, 11:02 AM
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Join Date: May 2008
Location: KANE, Hugo, Minnesota
Posts: 765
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Your friend has balls of steel. I would've landed that sucker right away. If that wing hit a critical angle, she could've stalled.
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Aaron Arvig
RV-9A
Empennage Done
Wings-In Progress
N568AK Reserved
SOLD?but I'll be back
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01-08-2013, 12:04 PM
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Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
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Test the stall.
Guys, I've ferried quite a few ag airplanes that had hit tree limbs and big birds with a huge amount of damage. It's a dangerous condition when it happens to you in the air.
Please, before you make your approach, take her up and see where it stalls at altitude. I'd bet that RV-4 had to land at least 10 MPH faster. Making a normal approach with this much damage could snap you over when you least expect it.
Best,
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Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
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01-08-2013, 12:17 PM
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Join Date: May 2012
Location: Harrisburg, Pa
Posts: 759
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Quote:
Originally Posted by pierre smith
Please, before you make your approach, take her up and see where it stalls at altitude. I'd bet that RV-4 had to land at least 10 MPH faster. Making a normal approach with this much damage could snap you over when you least expect it.
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This is a great comment and one that, obviously, comes from experience. Sometimes, the overwhelming desire to 'get her on the ground' can be blinding. Similar to tailrotor issues in a helicopter - yes you desperately want to be on the ground, but taking the time to evaluate control authority at various approach speeds can make the difference between a pucker factor landing, bent metal, or worse....
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01-08-2013, 12:20 PM
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Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,166
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Pierre has excellent advice. When you have aerodynamic problems or damage you need to make a control check at a safe altitude. Your really looking only for a safe speed to land. You don't want to see how slow a damaged aircraft can fly at. You want to pick a speed well above normal based on the degree of possible damage and establish the aircraft will fly at that speed and not go below it on a approach.
George
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01-08-2013, 12:33 PM
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Join Date: Apr 2012
Location: Tampa (BKV)
Posts: 926
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All of this shattered plexi has me seriously considering a helmet.
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RV-8 Flying
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