B-17E/F Bomb-Bay Question

[jcf]

and it was a direct outgrowth of the Model 247. Thus the low wing.

No, it wasn't.

In engineering terms it was, both in terms of basic aerodynamics and structural design.

[wuzak]

AN-M56A1 4000lb light case bomb

Length: 117.25in/2798mm (max)
Width Across fins: 47.62in/1210mm (max)
Bomb Weight: 4232lb/1919kg
Explosive: 50-50 Amatol
Explosive weight:3238lb/1469kg

[wuzak]

and it was a direct outgrowth of the Model 247. Thus the low wing.

No, it wasn't.

In engineering terms it was, both in terms of basic aerodynamics and structural design.

Yes, in that sense. It was a continuation of Boeing's best practice.

[KJ_Lesnick]

Okay, I have another couple of questions if anybody has an answer.  The issues pertain to increases in engine power and increases in weight.

Does anybody have weight and horsepower listings for the B-17 variants?

[wuzak]

Okay, I have another couple of questions if anybody has an answer.  The issues pertain to increases in engine power and increases in weight.

Does anybody have weight and horsepower listings for the B-17 variants?

You could peruse this: http://www.joebaugher.com/usaf_bombers/b17.html

[KJ_Lesnick]

Wuzak

I'm getting discrepancies... in the written section it says that the Y1B-17A could do 311 mph while the listed stats show a figure of 295 mph for example.

Another question is how did the B-17C end up doing 323 mph when the B-17B could only do 292 with the same HP?

[wuzak]

Wuzak

I'm getting discrepancies... in the written section it says that the Y1B-17A could do 311 mph while the listed stats show a figure of 295 mph for example.

Another question is how did the B-17C end up doing 323 mph when the B-17B could only do 292 with the same HP?

Not sure. It may be to do with the use of war emergencey power. Also, the B and C have the same power at takeoff, doesn't mean they did so at altitude.

[KJ_Lesnick]

wuzak

Not sure. It may be to do with the use of war emergencey power.

So, at WEP it could do 311 and otherwise do 292?  Could it also be at a specific altitude?

Also, the B and C have the same power at takeoff, doesn't mean they did so at altitude.

Did they have different turbos?

[wuzak]

wuzak

Not sure. It may be to do with the use of war emergencey power.

So, at WEP it could do 311 and otherwise do 292?  Could it also be at a specific altitude?

It may be that one model didn't have WEP available.

Also, the B and C have the same power at takeoff, doesn't mean they did so at altitude.

Did they have different turbos?

Different versions of the same engine may have different max or normal power even though they have the same takeoff power. That max power may be less than the takeoff power as well.