Author Topic: Alternative wing walker!  (Read 1923 times)

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Offline =CfC=Bounder

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Alternative wing walker!
« on: October 01, 2018, 01:26:19 AM »
Nuts or what 🙄

https://youtu.be/5dejuGeDpEU

Bounder

Offline =CfC=BlueDog

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Re: Alternative wing walker!
« Reply #1 on: October 01, 2018, 07:51:42 PM »
"Don't bunt, please don't bunt ........ Nooooooooooooooooooo!"

Offline John Cartwright

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Re: Alternative wing walker!
« Reply #2 on: October 02, 2018, 07:53:13 AM »
Crickey! What airspeed was he exposed to I wonder? Imagine if there had been a birdstrike. One wouldn't know where bird ended and his body began.
"Take that; you rotten Swastinkers you!"
:British Pathe News 1940

Offline =CfC=Bounder

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Re: Alternative wing walker!
« Reply #3 on: October 03, 2018, 02:18:57 AM »
I think all the video shows the DC 8 flying with flaps down so I would think he  exceeded about 150kts. but that is still about 50kts. faster than most wing walkers would experience.

Can't see our own CAA approving that stunt.......has to be the Canadian sense of adventure admirably demonstrated by our Canadian CfC contingent 😂😂

Bounder

Offline =CfC=BlueDog

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Re: Alternative wing walker!
« Reply #4 on: October 05, 2018, 09:37:23 PM »
Now kiddies, settle back in a comfy chair for Bluey’s scientific probe into the Human Fly affair (I’ll try to keep this simple for the benefit of our North American members)

Consider if you will (this is the way all we scientifically bent persons start off) the situation that Bounder posits: that the standard wing walker is subjected to an airspeed of approximately100 kts (indicated, of course); and that the Human Fly (HF) would be subjected to an airspeed of approximately 150 kts – DC8 flaps down.   Now those amongst you with little knowledge of dynamic pressure theory might assume that there is a linear relationship in action here and that HF will merely be subjected to an increase in pressure of a gentle 50%.

BUT NOT SO!

According to Bluey’s Big Book of Dynamic Pressure (available in hard copy or downloadable from Amazon) the formula for dynamic pressure exerted on a body is as follows:

q = (p.U2*)/2 (*for U2 read U squared) where:

q = dynamic pressure in Pascals (whatever a pascal might be or feel like)
p = fluid density in kg/m3
U = flow speed in m/sec

Now using this formula; for the case of standard temperature and pressure (150C at sea level) for dry air (p=1.225 kg/m3), the dynamic pressure at 100 kts would be 1621.000504429031 pascals.   Yet the dynamic pressure at 150 kts would be 3647.250662319451 pascals; an increase of approximately 2.25 times.  This, of course is due to the fact that the flow speed is squared, resulting in a significant increase in dynamic pressure that would be felt across the body by the luckless HF.

Now you might just wonder how this would feel like in real terms.   Well, Bluey has thought of the best way to demonstrate this:

Step 1:  drop a Formula 1 engine into Bounder’s trusty Austin A30.
Step2:  relocate same to Bonneville and load Chuffy’s chappies aboard.
Step 3:  Bounder puts pedal to metal and A30 leaps to 100 kts (115.07795 mph)
Step 4:  chappies wind down windows, put hands out and experience appropriate pascals for 100 kts
Step 5:  reposition A30 at start point, mount 2 x JATO bottles on vehicle then:
Step 6:  light up the bottles and repeat steps 3 and 4 to experience appropriate pascals for 150 kts (172.61692 mph), noting the significant increase in dynamic pressure.

But let’s get back to the Human Fly.  I suspect that what he really craves is a tad more “q”.

So, Captain Clay Lacey, get them flaps up, firewall them thar throttles and go for max airspeed:  511 Knots, 42337.72099212832 pascals!

Muhahahahahahahahahahahahahahaha!
« Last Edit: October 05, 2018, 09:40:52 PM by =CfC=BlueDog »

Offline =CfC=Bounder

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Re: Alternative wing walker!
« Reply #5 on: October 06, 2018, 01:20:46 AM »
Crikey Bluey.......... didn't understand a word of that apart from the A30 hand out of the window bit......always wondered for the 37 years I spent in aviation the science of aerodynamics and really am pleased I never understood it as I think I would have ducked out and made toy windmills for kids to stick out of car windows.

Mr. Benoulli has a lot to answer for and being Swiss should have concentrated on an alternative shape for Toblerone avoiding gum pain rather than frightening the hell out of adventurous kids trying to replicate birds.

I still think the words of the chap in the famous film about breaking the sound barrier summarise the British way of pushing aerodynamic boundaries.......push on the stick with full power and mumble into the microphone "Here we go........this is it" with only a vague understanding of what will happen..........here is the first run...... you'll have to watch the whole film to understand the theory that no understanding is the "British way"😁......(full film available on YouTube.)

https://youtu.be/9XEhPodmUEI

Bounder

Offline =CfC=BlueDog

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Re: Alternative wing walker!
« Reply #6 on: October 06, 2018, 01:53:54 AM »
Ah yes, a great movie.   Must have seen it at least 10 times as a kid.

Offline John Cartwright

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Re: Alternative wing walker!
« Reply #7 on: October 07, 2018, 01:10:21 AM »
And of course the English test-pilot chappie would be wearing the de rigueur three-piece tweed suit, trilby and equipped with his best pipe!
Some marvellous obscure footage on this chap's aviation history channel channel:
https://www.youtube.com/user/Bomberguy/videos
Many dating from the Golden Age of Flight when Woof was nobbut a lad.

After reading Bluey's post, my brain hurts.
"Take that; you rotten Swastinkers you!"
:British Pathe News 1940

Offline =CfC=Woof

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Re: Alternative wing walker!
« Reply #8 on: October 07, 2018, 04:32:57 PM »
At 1.36 in Bounder's tape it looks like the DC8 is taking off with reversers extended.  I flew it a lot in the 70's and can remember using the inboard reversers in flight...slowing down for the approach and reversing off the gate, but never on takeoff.  Any experts around to clear my misty memories?


I'v got deja vue all over me...

Offline =CfC=Bounder

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Re: Alternative wing walker!
« Reply #9 on: October 08, 2018, 06:25:04 AM »
At 1.36 in Bounder's tape it looks like the DC8 is taking off with reversers extended.  I flew it a lot in the 70's and can remember using the inboard reversers in flight...slowing down for the approach and reversing off the gate, but never on takeoff.  Any experts around to clear my misty memories?

Don't know anything about DC8's Woof.......only flew Boeing's.......but I wonder if the film editing jumps to a low fly by at the point you mentioned?

The CFM56 engine was introduced in the late 70's to the 70 series a/c which was 70% quieter....(Wiki)..I wonder if the noise reduction cowlings at the back of the engine might give an impression of reversers being deployed?

Still nuts😀

Bounder

Edit.......it is indeed a sound reducing device........see here:-

https://aviation.stackexchange.com/questions/37332/what-is-this-ring-shaped-device-behind-this-dc-8s-jet-engine
« Last Edit: October 08, 2018, 08:49:12 AM by =CfC=Bounder »