B-17 Bomber's Exterior Features 1/4 View Walk Around

The intent of this video is to provide an introduction to the B-17 Bomber’s right front quarter exterior features (Part 2).
A free high quality .pdf copy of this page can be viewed and/or downloaded here:
drive.google.com/file/d/1I29u...

[@markjosephbudgieridgard]

Excellent as usual I've watched every vidio this guy has put up absolutely brilliant for us B17 fanatics.... I didn't realise how many systems these wonderful aircraft had.... RIP all USA airmen the UK owes you a debt of gratitude.... 🇬🇧👍

[@stevedemarest276]

I learn something new in every one of these vids. Very well researched and presented.

[@billyponsonby]

Great insight

[@jamescameron2490]

I seem to recall reading that the deicer boots were often removed in the ETO to prevent them tearing loose due to battle damage and fouling the control surfaces of trailing aircraft. The area under where the boots had been would be the unpainted aluminum skin.

[@markfrench8892]

Any chance you could do a video on how the retracts work on a B-17?

[@lorrinbarth1969]

You explain that the inter cooler removes heat produced by the mechanical work done to compress the air. Well, air heats anytime it is compressed and absorbs heat anytime it expands, its a physical law. Air flowing over a mountain range and falling into a valley will compress producing a warm day for the valley inhabitants.

[@Mike_Greentea]

Your science teacher misinformed you.

[@lamwen03]

@@Mike_Greentea Anyone in Southern California who has experienced Santa Ana winds would disagree with you.

[@dukecraig2402]

Air, or any gas, cools when it expands and heats when it's compressed, there is no exception to that anywhere in the universe. To say that air absorbs heat when it expands is simply because after expanding it's cooled and heat always travels to less heat irregardless of what the material is, it's not unique to air that's just expanded. But I think you may be a little confused on how the inner-cooler works, expanding air has nothing to do with it, the inner-cooler is a heat exchanger just like a radiator, when the turbo compresses air it heats it, this compressed air moves through the inner-cooler just like engine coolant moves through a radiator, the outside air that's -50° f at that altitude travels from the inlet scoop for the inner-cooler and passes over the inner-cooler itself cooling the heated air moving through it just like the air passing over a radiator cools the heated engine coolant passing through it, it's nothing more than a radiator to cool the air that's been heated from being compressed by the turbo. The reason, and why it's so important, for cooling the air that goes through the INSIDE of the inner-cooler is because that's the air that's going into the engine and the more it's heated the more it'll induce detonation (engine knock) which means you have to retard the timing and richen the fuel mixture both resulting in less power, it's critical to cool the air that was heated being compressed by the turbo because it's also going to be heated even more by the supercharger when it compresses it. The turbo is essentially the 2nd stage of the supercharging system and at lower altitudes typically isn't even used, some aircraft engine's use a 2 stage 2 speed supercharger for high altitude performance, those types have to be shifted into their low range (speed) at low altitudes to keep from overboosting the engine, with the supercharger/turbo configuration on the B17, and most other USAAF aircraft of WW2 like the P47 fighter, at low altitude engine exhaust is routed out of wastegate dumps and doesn't drive the turbo, it isn't until the aircraft gets to medium altitude where the engine's single stage supercharger can no longer provide maximum boost due to the thinning air that the wastegate dumps start closing and route exhaust to the turbo thus driving it, what the turbo starts doing is providing the engine's supercharger with the type of inlet air pressure it naturally has at lower altitudes in the thicker air, the higher the aircraft climbs the more the wastegate dumps close routing more exhaust to the turbo thus spinning it faster to keep the ever thinning air compressed so the inlet of the engine's supercharger keeps getting the same air pressure it'd get at lower altitudes. This system has advantages over the more simple 2 stage 2 speed supercharger system that would simply shift into it's high range at medium altitude, the biggest advantage being is that every stage of a supercharger drags around 150 HP off the engine driving it, so when a 2 stage 2 speed supercharger shifts into it's high range it's dragging 300 HP off the engine driving it, but a turbo is a waste energy recovery system so when the turbo starts coming into play at medium altitude it doesn't drag another 150 HP off the engine, that's why if you compare the power of an R2800 engine in a P47 to the same R2800 engine in an F4U that uses a 2 stage 2 speed supercharger as opposed to the P47's supercharger/turbo configuration the F4U's engine is down 150 HP at higher altitudes, another advantage is just like how a single stage supercharger runs out of boost at medium altitude a 2 stage supercharger eventually runs out of boost at higher altitudes, but with the supercharger/turbo configuration since the turbos could be spun up to 22,000 RPM's the system can provide maximum boost well above the altitude a 2 stage supercharger system can giving aircraft with that system unequaled performance at the highest altitudes, that's why a P47M could drag it's fat ass up to 40,000 ft and scream along at 470 MPH. But like everything else there's downsides to it, the turbo system takes up more space for the ductwork and there's heat issues that have to be overcome during development and a system like that costs a lot more, between the ductwork and the turbo itself it's an expensive system including the added development costs, but if you want a bomber that can fly higher and faster than the other bombers and a big fat ass fighter that can scream along at 40,000 ft then you gotta pay for it.

[@TigerDominic-uh1dv]

The Engineers Were Really Smart I'm not good with Math They Were 😊