P-47

[bozon]

The D25 and the D30 are identical in FM

I'm not completly sure about that. The D25 seems to stall a bit differently. It tends to start flying sideways when stalled at low speeds, seems like it's less stable in the yaw direction.
It can happen in the D30 as well but less often and never happened to me in D11.

anyway, they are pretty darn close in FM.

Bozon

[moot]

Originally posted by OIO
All 3 are F- UGLY

Originally posted by -ammo-
All three AC are the most beautifull military AC ever produced

[OIO]

I bow to Ammo's knowledge of the Jug, he flies them more than I do. I always thought the later models were faster, thats a surprise!

Oh, and they are f-ugly. Ammo flies on beer goggles. Just look at that sheep he wed

[RightF00T]

Bozon thats because the D30 has a tail fillet right in front of the rudder that negates that yaw.  The D25 lacks this and thus is less stable at stalls.

[frank3]

when talking of turbo chargers...I know a turbo charger 'charges' itself to produce an extra bite of aderaline to the engine. but how exactly does this thing work?

anyone know's?

[-ammo-]

http://rwebs.net/avhistory/history/supercha.htm

Basically,  a turbo charger is an air pump that is powered by the engines exaust. As the hot exaust spins the the turbine, the turbine then pumps fresh air into the intake manifolds (as opposed to naturally aspirated engines which rely on atmospheric pressure to feed air tot he intake manifold).  More air, more power.

[Shiva]

Turbochargers and superchargers both work by compressing the air entering the engine, allowing more air to be driven into the cylinders on each stroke. Essentially, hooking a high-pressure pump over the air intake. Superchargers are directly driven by the engine itself; turbochargers work like the compressor and turbine rotors in a jet engine -- the hot exhaust gases spin the turbine, which spins the compressor to push more air into the engine.

Turbochargers are inherently more efficient, because they use wasted energy -- the hot exhaust gas -- to drive the compressor. However, they also add back pressure to the exhaust, reducing the efficiency at lower RPMs (less boost at lower RPMs compared to a supercharger), and 'turbine lag' (the time between punching the throttle and getting boost from the turbocharger) limits its responsiveness to sudden throttle changes. Superchargers don't suffer from turbine lag, being driven directly by the engine. However, they're more complicated to make and maintain.

[frank3]

I've also heared something like a water-injection for an extra boost (it's from Microsoft combat flight simulator pacific war)

and didn't the B-17's and other bombers had turbochargers for heigh alts too?

[Shiva]

A turbocharger compresses the air going into the engine in order to force more air than would be possible with the atmospheric pressure. More air into the engine means automatically more fuel has to be injected in order to maintain the appropriate stoichiometric value of the air/fuel ratio (around 14:1). More air and fuel into the engine leads to more power. However, by compressing the inlet air the turbocharger also heats it. Higher air temperatures lead to thinner air and therefore an altered stoichiometric ratio which can lead to a lean mixture and detonation (knocking or pinging, which in severe cases can damage an engine).

In high-pressure turbocharged engines the air/fuel mixture that enters the cylinders can, in some cases, explode prematurely (before the spark plug ignites) due to the extreme engine environment conditions. This situation is extremely destructive and results in severe engine damage (piston piercing). To avoid damaging the engine by detonation or pre-ignition phenomena, water is injected, along with fuel, into the combustion chambers in order to provide a water/air/fuel mixture which not only burns more efficiently and avoids detonation or pre-ignition but also provides additional inlet air cooling and, hence, denser air. The water can be added at several different points along the intake path, but it performs the same function regardless of where it's added.

[OIO]

P38 out accelerates the jug in the dive initially. But after 300mph the jug just leaves the 38 eating dust.

It is, after all, nothing more than a huge lawndart with a prop.

[bockko]

ammo flies a good case for the p47 being effective when flown right

[Red Tail 444]

Originally posted by -ammo-
Actually the fastest of the three at all
All three AC are the most beautifull military AC ever produced.

I agree...Right after the F4U-4...

Gainsie

[davidpt40]

Heres a kind of strange question- Why didn't the Air Force use F4Us and P47s instead of the A1D skyraiders in Vietnam?

[gripen]

Well, the P-47 had two stage charger system. The auxilary stage was a turbo and engine stage was mechanical. The turbo just keeped constant pressure in the manifolds between auxilary stage and engine stage up to it's critical altitude ie to altitude where the turbo reached it's max safe spinning speed.

It should be noted that in the mechanical supercharger system energy of ehaust gases can be used for propulsion.

gripen

[Guppy]

Originally posted by davidpt40
Heres a kind of strange question- Why didn't the Air Force use F4Us and P47s instead of the A1D skyraiders in Vietnam?

Think payload.

The A-1 could carry seven or eight thousand pounds of external fuel and weapons. The heavier WWII-era fighters (such as the P-47 and F4U) could typically carry about four or five thousand. More importantly, the Skyraider had 12 wing stations and 3 fuselage stations for external ordnance, as well as its wing-mounted 4 x 20mm. Most WWII fighters had only three or four stations, and could only get up to maximum payload by using two of them for 2,000 lb. bombs. The A-1s had a lot more flexibility when deciding what loadout to carry for ground attack.