Amazing machine work

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neanderman
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Re: Amazing machine work

Post by neanderman »

You guys amaze me...
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Steggy
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Re: Amazing machine work

Post by Steggy »

RSG wrote: Sun Apr 24, 2022 8:06 amSome fine precision work going on there! No doubt very important too for the safety factor alone! Given it's for an aircraft!

That reminds me of an inside joke that was common during the waning days of airliners powered by radial engines. The Wright Turbo-Compound engine, in particular, was noted for emitting flames from the exhaust at higher power settings. A fanciful safety announcement before takeoff would include “Ladies and gentlemen, do not be concerned about the flames coming from the engines...unless they go out.”
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Bill Shields
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Re: Amazing machine work

Post by Bill Shields »

Or crawl up the wing toward the fuel tank ..
Too many things going on to bother listing them.
RSG
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Re: Amazing machine work

Post by RSG »

LOL@BigDumbDinosaur :lol:
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Steggy
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Re: Amazing machine work

Post by Steggy »

RSG wrote: Fri Apr 29, 2022 5:13 pm LOL@BigDumbDinosaur :lol:

Exhibit A:

https://www.youtube.com/watch?v=taU6qu5pXBo
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Steggy
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Re: Amazing machine work

Post by Steggy »

Bill Shields wrote: Fri Apr 29, 2022 4:01 pm Or crawl up the wing toward the fuel tank ..

That was the province of the B-36 bomber.
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neanderman
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Re: Amazing machine work

Post by neanderman »

BigDumbDinosaur wrote: Sat Apr 30, 2022 3:15 am
RSG wrote: Fri Apr 29, 2022 5:13 pm LOL@BigDumbDinosaur :lol:

Exhibit A:

https://www.youtube.com/watch?v=taU6qu5pXBo
Is that the piston-based internal combustion equivalent to 'after burners?' 😝
Ed

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Bill Shields
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Re: Amazing machine work

Post by Bill Shields »

Nah...these flanes provide no extra thrust..unless they reach the fuel tank..-> in which case the thrust is usually omnidirectional.
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GlennW
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Re: Amazing machine work

Post by GlennW »

I used to communicate with the chief Aerodynamicist on the Mustang, now deceased, and he had numbers on the thrust produced by the exhaust and the radiator outlet. Cold air enters the front of the belly scoop, is heated going through the radiator, and expelled through a reduced opening. A simple turbine engine.

There is quite a bluish white glow seen from the cockpit from the exhaust when flying one at night.

Somewhere, I have a pile of little reports in folders that he used to compile and sent me on areas such as this.
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Steggy
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Re: Amazing machine work

Post by Steggy »

Bill Shields wrote: Sat Apr 30, 2022 6:39 am Nah...these flanes provide no extra thrust..unless they reach the fuel tank..-> in which case the thrust is usually omnidirectional.

Well, one can always benefit from a little heat to the wings to keep them from icing. :D
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Steggy
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Re: Amazing machine work

Post by Steggy »

neanderman wrote: Sat Apr 30, 2022 3:45 am
BigDumbDinosaur wrote: Sat Apr 30, 2022 3:15 am
RSG wrote: Fri Apr 29, 2022 5:13 pm LOL@BigDumbDinosaur :lol:

Exhibit A:

https://www.youtube.com/watch?v=taU6qu5pXBo
Is that the piston-based internal combustion equivalent to 'after burners?' 😝

Well, sort of...

The Wright Turbo-Compound has “power-recovery” turbines (PRT) in the exhaust system that are analogous to the turbine of a turbocharger. However, in the Turbo-Compound design, the three PRTs are connected via hydrodynamic couplings and gear reduction to the crankshaft. An estimated 550 horsepower is added to the engine’s output at maximum continuous throttle (which is less than full throttle) by this arrangement, despite the exhaust backpressure added by the PRTs. For about the same fuel burn rate, some “free” horsepower was obtained, which made the engine more economical to operate during cruise flight.

Getting the right fuel mixture with this arrangement was somewhat tricky. Takeoff is typically done with a relatively rich mixture. Following initial climb-out, engine power is reduced and the mixture is leaned accordingly. Occasionally, pilots would lean out the mixture too much during climb, causing exhaust valve overheating. As the exhaust valves were sodium-filled, they were not made from a single piece of steel and thus more vulnerable to failure.

Once a valve got hot enough, it would break and depending on the cylinder’s position (higher than or lower than the crankshaft centerline), pieces would either end up flying around in the cylinder or being ejected out the exhaust port and into one of the PRTs. Either way, a lot of expensive stuff would get trashed and the engine would now be just along for the ride. This happened often enough that the Lockheed Super Constellation was once referred to as the finest three-engine airliner ever built. A&P mechanics who had to clean up the mess (sometimes a failed engine was salvageable) referred to the PRTs as “parts recovery turbines.”

Given the extraordinary complexity of the Turbo-Compound and the maintenance headaches that went with it, many airlines had a hard time making money with Turbo-Compound-powered planes. I flew once on a Super Connie and also on a Douglas DC-7 (Turbo-Compound powered). In both cases, it was a noisy, vibrating experience. However, I must say watching the exhaust flames was a bit entrancing. :D
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RSG
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Re: Amazing machine work

Post by RSG »

BigDumbDinosaur wrote: Sat Apr 30, 2022 3:15 am
RSG wrote: Fri Apr 29, 2022 5:13 pm LOL@BigDumbDinosaur :lol:

Exhibit A:

https://www.youtube.com/watch?v=taU6qu5pXBo
brilliant! Eliminates the need to worry about burnt out light bulbs in the strobes. :lol:
Vision is not seeing things as they are, but as they will be.
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