RE: B-24 versus B-17
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06/19/2007 08:45:30 PM
Steven..I will again catch H*** for taking my stand.
First a little history...the B-17 was developed by Boeing in the years 1934-1935.
The B-24 was developed in 1939. some four years later...the B-24 had a higher cruising speed due to it's DAVIS wing, and a sore point with me, is the claim of the B-24 people that the B-24 was designed to fly faster, higher and further than the B-17.
It is true the B-17 only carried 1700 gal fuel in it's main tanks, so when the B-24 was designed, it had a much larger fuel capacity...However, when the B-17 was modified with the so-called tokio tanks, the range was almost that of the B-24...a little less to be sure, but not really that much.
HOWEVER, there were some things that set the two aircraft apart...one was that the B-17 had a fuel indicating system whereby there was a remote float and potentiometer, that went to a single cockpit indicator with 6 positons, wherby each main tank fuel indication could be read in the cockpit. (this is the same system used in an automobile).
The B-24 on the other hand, was designed with TWO parallel glass tubes similar to a common coffe maker with level of the liquid indicated by the level in the glass tube.....If the glass was broken, the fuel quantity was then unable to be determined.
Secondly, the B-17 was almost totally electric..the only things that were hydraulic was the cowl flaps and brakes, and the hydraulic turosupercharger control system, which required an engine driven hydraulic pump on the two inboard engines. The latest B-17G had an electronically controlled turbospercharger system, as did the later B-24s.
The B-24 was hydraulic with ONLY one engine driven hydraulic pump on the No 3 engine...in the event the No 3 engine was shutdown, there was no hydraulic pump to operate the brakes....to solve this, an electric motor driven pump was installed in the bomb bay...where due to a quirk in the fuel system on the early B-24s, mostly leaked and therefore the bomb bay doors had to cracked open on takeoff and landing....the electric motor sparked when operated, and if fuel fumes were present, caused an explosion.
Why there was only ONE engine driven hydraulic pump escapes me.
As to the flying higher...this is false...the service ceiling for the B-24, at least the early models was 28,000 ft...the B-17 with its slower wing, could reach 35,600 ft with a full bomb load..true, at that altitude, the B-17 was mushy on the controls...the same thing happened with the B-24 only at 28,000 ft. So this meant that the ceiling on the B-17 was some 7,600 ft higher. And from Italy, I have watched our B-17 formation actually PASS the B-24 formation. This was due to the denser air at 20,000 ft while the B-17 was at 27-29,000 ft, where the air was that much thinner, that the B-17 TRUE airspeed, although indicating some 10 MPH slower was actually some 20 MPH faster, allowing the B-17 to pass the B-24 formation.
In the Pacific theater, with the B-24s two bomb bays, a set of bomb bay fuel tanks could be carried and still carry a bomb load.
In the Mediterreanean, however, the bomb load of the B-17 and B-24 were identical, and the B-24 had a struggle getting to 28,000 ft...most B-24 bombing altitudes were close to 24,000 ft.
Another item is touted by the B-24 people is the total number of the B-24 compared to the B-17...will someone expaln how there were only THREE factories assembling the B-17 with FIVE factories asemblling the B-24, can be actually compared ?
The total B-17 production figure is given as 12,731, with the total B-24 production figure as somewhere around 20,000, if the Navy PB4Y1 and PB4Y-2 are added.
Now having said all of this. the actual combat losses of the B-17 and B-24 were very close to each other...so, in that sense, to say one was better, is almost like comparing apples to oranges.
To sum it up...whatever, brought you back was a good aircraft, whether it was B-17s, B-24s, B-29s ,or any of the medium bombers.
Jim :-)
James S. Peters Sr. T/Sgt
B-17 Flt Engr, 27 missions
99 BG, 348BS, 5th Wing, 15th AAF
Tortorella, (Foggia#2), Italy
My Tour was from 12/03/44-06/19/45
M/Sgt USAF (Retired)