VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Main > RV General Discussion/News
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #61  
Old 08-02-2013, 09:18 AM
Hobjogus's Avatar
Hobjogus Hobjogus is offline
 
Join Date: Jul 2011
Location: Canton, TX
Posts: 21
Default Safety Glasses

I wear safety glasses while mowing on my John Deere tractor, I have had a lot of grasshopper strikes. (oops wrong forum.)
Reply With Quote
  #62  
Old 08-02-2013, 09:25 AM
Hobjogus's Avatar
Hobjogus Hobjogus is offline
 
Join Date: Jul 2011
Location: Canton, TX
Posts: 21
Default LLumar Safety Film

Quote:
Originally Posted by riseric View Post
What about the protective films that can be installed on car glass to prevent intrusion/theft/car jacking like seen here ??

Watch the video about car jacking.

I know it's applied to car glass instead of plexiglass, but it could be interesting to learn if this film or some other type of protective film could help in preventing canopy failure or at least some birds from crashing through the canopy.
Good information. Could be helpful when the DHS tries to bully there way into your car too.
Reply With Quote
  #63  
Old 08-02-2013, 10:07 AM
Low Pass's Avatar
Low Pass Low Pass is offline
 
Join Date: May 2006
Location: Houston
Posts: 2,012
Default

I'd like to see the person who's neck can withstand being whipped back after catching a 5-10-lb bird in the face at 100-150 kts (with a helmet, visor, etc.). Maybe it's survivable, but intuitively I'm thinking not. However, I do buy in on the safety glasses in case you don't take the bird to the head. The films are amazing, but wonder if there are any products that could conform to a compound-curved windscreen?

Last edited by Low Pass : 08-02-2013 at 10:28 AM.
Reply With Quote
  #64  
Old 08-02-2013, 10:14 AM
rbibb's Avatar
rbibb rbibb is offline
 
Join Date: Jun 2006
Location: Freericksburg, VA
Posts: 624
Default

Quote:
Originally Posted by Silent_Flyer View Post
Impressive damage.. Is anyone aware of a bird strike to the canopy in an RV-4? I see the results often on the military side and know what specifications we put on tactical aircraft windscreens. As my face sits 10" from the fwd windscreen I've been curious to wee what if any testing has been done or what real world encounter is out there and the end result?
I had a bird strike on my RV-4 Canopy in flight once. I don't know what type of bird it was but it must have been fairly small. I was flying along and "BANG". Scared the **** out of me. But the canopy was undamaged except for some bird guts and blood spatters. It hit fairly centered right in front of my face. I think the slope deflected it and that contributed to the canopy not absorbing all the energy. YMMV. I'm pretty sure a turkey vulture would have ended up in my face.
Reply With Quote
  #65  
Old 08-02-2013, 01:42 PM
Smilin' Jack Smilin' Jack is offline
 
Join Date: Jan 2011
Location: Cumming, Georgia
Posts: 873
Default

Myself and Ricky Smith director of ops at Phoenix Jets in Cartersville, Ga.now,were descending out of the clouds headed to Pascagoula,Miss when we encountered a flock of Buzzards in a Cessna CE 500 in 1978
I was the co Pilot and Ricky yanked and banked hard to miss all the birds but one lone bird dived bombed us went over the windscreen and struck the Vertical Stab. The damage was unreal as the first two vertical ribs were ripped in two and the skin was parted and the damage extended back to the rudder attachment on the top. The total damage was about 1 foot vertical and 2 feet horizontal gone. The bird and the guts
continued inside the V/S and parts ended up in the **** hole equipment bay. We had our mechanics come and ended up getting a ferry permit to bring the plane with the gear down back to PDK
Citations have big windscreens but a buzzard exceeds the 5 lb frozen bird test. It is a risk we all take even in our Challenger today.

Bird proof or not... Big enough it is coming inside.
I am a firm believer of sitting lower in a cockpit and do not get distracted by looking inside long.
Smilin' Jack
__________________
Smilin' Jack & Anita Hunt
N507H RV7, KJZP Jasper, GA
EAA690
APRS/ WB4JKY
Retired Corporate Pilot CFI-AI, MEL
CE500, LRJT, HS25, C650, SBJT, CL60
Hunt Aviation, LLC.
Pilot Service, IPC's Biennials.
Comm Glider
Reply With Quote
  #66  
Old 08-02-2013, 07:09 PM
Smilin' Jack Smilin' Jack is offline
 
Join Date: Jan 2011
Location: Cumming, Georgia
Posts: 873
Default

Myself and Ricky Smith director of ops at Phoenix Jets in Cartersville, Ga.now,were descending out of the clouds headed to Pascagoula,Miss when we encountered a flock of Buzzards in a Cessna CE 500 in 1978
I was the co Pilot and Ricky yanked and banked hard to miss all the birds but one lone bird dived bombed us went over the windscreen and struck the Vertical Stab. The damage was unreal as the first two vertical ribs were ripped in two and the skin was parted and the damage extended back to the rudder attachment on the top. The total damage was about 1 foot vertical and 2 feet horizontal gone. The bird and the guts
continued inside the V/S and parts ended up in the **** hole equipment bay. We had our mechanics come and ended up getting a ferry permit to bring the plane with the gear down back to PDK
Citations have big windscreens but a buzzard exceeds the 5 lb frozen bird test. It is a risk we all take even in our Challenger today.

Bird proof or not... Big enough it is coming inside.
I am a firm believer of sitting lower in a cockpit and do not get distracted by looking inside long.
Smilin' Jack
__________________
Smilin' Jack & Anita Hunt
N507H RV7, KJZP Jasper, GA
EAA690
APRS/ WB4JKY
Retired Corporate Pilot CFI-AI, MEL
CE500, LRJT, HS25, C650, SBJT, CL60
Hunt Aviation, LLC.
Pilot Service, IPC's Biennials.
Comm Glider
Reply With Quote
  #67  
Old 05-08-2016, 06:43 PM
sblack sblack is offline
 
Join Date: Dec 2009
Location: Montreal
Posts: 1,456
Default

Quote:
Originally Posted by Av8torTom View Post
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..."

If that's the case then how can we predict the lift on a wing with a couple of percent using computational fluid dynamics? Do you think Boeing spends 40 billion on a jet design with absolutely no idea if the wing is big enough?

All those methods calculate velocity profiles to determine static pressure all over the airplane. From there all of the forces on are calculated to predict the flight characteristics and to design the structure.

The first wind tunnel project that an aero engineering student does is usually to run a pitot tube to calculate airspeed and to see the affect of angle of attack on pitot measurement. The second one is to measure pressures all over an airfoil, integrate them and add up the forces and compare to the measured forces on the tunnel balance. The forces usually compare within a few %.
__________________
Scott Black
Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2020
Instagram @sblack2154
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 12:32 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.