Stu Ehr
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losing an engine b4 n after bomb run
Is it possible for a fully laden B-17 or B-24 to stay up with their group through the bomb run, short an engine? I guess we're assuming 25,000 feet with the engine lost 10 minutes before the bomb run. Would the AC lose speed altitude or both? How much? Was it possible to find enough energy by temporarily pushing the remaining 3 engines to make it through the bomb run and stay up with the group? The follow-on question is, short an engine and if unable to keep up, was it acceptable to salvo the load if over enemy territory? Would the AC then have been able to keep up with the formation through the bomb run? What about over an occupied country; what options are available to the pilot to not risk getting picked off by enemy AC and keep up with the formation? Sorry for all the follow-up theoreticals piled onto the original inquiry.
Best Regards, Stu Ehr Sisters, Oregon
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billrunnels
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Re:losing an engine b4 n after bomb run
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In my opinion, the loss of an engine(B-17) ten minutes before the bomb run could finish the run in formation. However, due to lost speed and power, it most likely could not remain in the formation on the way back. Regarding "salvo", there would be no point in making the bomb run through the flak if the bombay was empty. The aircraft would simply get out of the way avoiding the flak if possible. The loss of one engine would not justify salvoing the bombs because it would not be an emergency situation. When bombs were salvoed they left the aircraft in a "safe mode" and would not explode on impact. Getting rid of the bombs as soon as possible would be necessary but the bombardier would drop them "live" with a seven foot separation on impact and they would explode.
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Stu Ehr
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Re:losing an engine b4 n after bomb run
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Thanks once again Bill for your valuable insights. Seems you've covered all the questions I had. I didn't realize that salvoed bombs were in a safe mode. I guess the question I have then, based on my limited understanding, is that didn't the bombs have to be safetied by inserting the wires that kept the arming propellers from spinning? Thanks again!
Best Regards, Stu Ehr Sisters, Oregon
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billrunnels
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Re:losing an engine b4 n after bomb run
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When the bombs were salvoed the arming wires left the aircraft in the bomb fuses thus preventing the impellers from spinning off arming the bomb. Thats why they would not explode on impact.
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Mike.Simpson
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Re:losing an engine b4 n after bomb run
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Bill: Are the safety wires attached to the rack mounting bar and that gets jettisoned when the bombs are salvoed? billrunnels
When the bombs were salvoed the arming wires left the aircraft in the bomb fuses thus preventing the impellers from spinning off arming the bomb. Thats why they would not explode on impact.
Mike Simpson Webmaster & Unit Historian 445th Bomb Group (Heavy) www.445bg.org
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billrunnels
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Re:losing an engine b4 n after bomb run
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The arming wire is attached to the "bomb shackle" which carry, arm and release the bomb. The shackle is attached to the bomb and hung on the suspension hooks of the bomb rack. The shackle releases the arming wire and bomb on salvo and remains in the aircraft.
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jpeters140
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Re:losing an engine b4 n after bomb run
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billrunnels
In my opinion, the loss of an engine(B-17) ten minutes before the bomb run could finish the run in formation. However, due to lost speed and power, it most likely could not remain in the formation on the way back.
Bill...I do not mean to argue with your statement that losing an engine before the bomb run, but, in my opinion, from my experience, the loss of an engine, could, and I say COULD result in losing the aircraft place in formation....there would be a lot of action on the part of the pilots and engineer in shutting the engine down,and featering the propellor, and could easily result in losing the proper formation alignment. As far as keeping up with the formation after the bomb drop, .....we shut down an engine due to extreme loss of oil due to a flak hit and had no trouble with keeping our place in the formation....it was all down hill and we were much lighter due to releasing the bomb load, and the lessened fuel load...we consumed about 3/4 of our fuel getting to the target and only about 1/4 of the total fuel on the way home...the engines were not laboring and there was no problem with the cylinder head temps. I observed CHT's (Engine Cylinder Head Temperatures) on the RED line all the way to the target, as we were lifting the load of bombs, after the bomb release, the CHTs were in a normal range. I might point out again, that one of the differences between the 8th and 15th was that we had to climb to clear the Alps on the way to the targets, in most cases and again, on the way back.....there were several crash sites on the Alpine glaciers. Respectfully, 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)
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billrunnels
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Re:losing an engine b4 n after bomb run
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It's a difference of opinion. I think our pilots were capable of maintaining a spot in or close to the assigned position in the formation for 16 to 18 minutes to "bombs away" at an indicated air speed of 150MPH. It was not all down hill for us as our targets were deep in Germany and we sustained the assigned bombing altitude for a considerable period of time on the way back with a gradual let-down to clear enemy lines at a minimum altitude of 18,000ft to avoid small arms fire. Would often see B-17 aircraft limping back over enemy territory at a lower altitude with one engine feathered . I hope a pilot or two will comment on this matter taking the subject beyond the opinion stage. Jim, thanks for your opinion.
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Stu Ehr
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Re:losing an engine b4 n after bomb run
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Thanks Bill, Jim, Mike as always for the enlightening perspectives! I remember, can't be sure where I remember it from though, that possibly earlier on '42-'43, that safety wires were manually pulled at some time to arm the bombs on the way to the target. Does that sound right? If so, when would that have changed to the fuses being pulled free from the shackles instead?
Best Regards, Stu Ehr Sisters, Oregon
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billrunnels
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Re:losing an engine b4 n after bomb run
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The fuse cotter keys and arming wires were both safety devices to prevent accidental detonation. The cotter keys prevented detonation during handling and loading of the bombs. They were pulled shortly after take off. The arming wires remained in the fuses preventing accidental detonation during flight. I can't imagine pulling the wires before "bombs away" but the period you referred was before my time and procedures could have changed.
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mcoffee
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Re:losing an engine b4 n after bomb run
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I have a mission debrief form for a B-24 group where one of the aircraft lost an engine prior to the IP and jettisoned one of the 1000lb bombs they were carrying in order to stay with the formation through the bomb run and then dropped the remaining bombs at the target.
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jhor9
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Re:losing an engine b4 n after bomb run
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After 70 years, my opinion may not be written.in stone.
It's spossible to remain in formation and drop wih the group,dependng on what is wrong with the engine.
Jim- The pilot feathers the engine at once, then the engineer sees to it that the controls are returned to their proper positions.
During the time of heavy fighter opposition the plane would be considered a cripple and he might not mske it back to base. ..
Jules Horowitz, B-17 pilot, 99th BG, 50 missions/sorties My tour was from 7/19/43-2/13/44
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billrunnels
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Re:losing an engine b4 n after bomb run
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Jules, Thanks for your reply.
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Stu Ehr
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Re:losing an engine b4 n after bomb run
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Bill, that's what it must have been then was cotter keys being removed and not arming wires. I think in one of the books I read, the flight engineer kept track of the cotter keys, in case they had to be reinserted for any reason, possibly a quick return to base? Thanks!
Best Regards, Stu Ehr Sisters, Oregon
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billrunnels
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Re:losing an engine b4 n after bomb run
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Stu, When I was there the bombardier kept the keys in his possession after pulling them in case they had to be reinserted for landing when the bombs were brought back to base. We also had to turn the keys in for counting when returning from a mission. The cotter keys in bombs mounted below the "cat walk" in the B-17 were difficult to get to and some of the bombardiers were not pulling them. Ground forces found the bombs unexploded with the keys still in the fuses as they advanced.
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