Amerikabomber

* [[Heinkel He 277]] (as it underwent ongoing engineering development through 1943, itself first specified by its [[List of RLM aircraft designations#201-300|RLM airframe number]] by February 1943).<ref name="Heinkel He 177 – 277 – 274"/>

* [[Heinkel He 277]] (as it underwent ongoing engineering development through 1943, itself first specified by its [[List of RLM aircraft designations#201-300|RLM airframe number]] by February 1943).<ref name="Heinkel He 177 – 277 – 274"/>

Three prototypes of the Me 264 were built, but it was the Ju 390 that was selected for production. A verified pair of the Ju 390 design were constructed before the program was abandoned. After World War II, several authors<ref>Wagner and Nowarra 1971, p. 314.</ref> claimed that the second Ju 390 actually made a transatlantic flight, coming within 20&nbsp;km (12&nbsp;mi) of the northeast U.S. coast in early 1944, but this claim has since been discredited as Ju 390 V2 never flew. As both the Me 264 and He 277 were each intended to be four-engined bombers from their origins, the [[Luftwaffe#Engine development|troubling situation of being unable to develop combat-reliable piston aviation engines of 1,500 kW (2,000 PS) and above output levels]] led to both designs being considered for six-engined upgrades, with Messerschmitt's paper project for a 47.5 meter wingspan "Me 264B" airframe upgrade to use six BMW 801E radials,<ref>{{cite book |last1=Griehl |first1=Manfred |last2=Dressel |first2=Joachim |title=Heinkel He 177 – 277 – 274 |year=1998 |publisher=Airlife Publishing |location=Shrewsbury, UK |isbn=1-85310-364-0 |page=187 }}</ref> and the Heinkel firm's [[1943 in aviation#July|July 23, 1943]]-dated request from the RLM to propose a 45-meter wingspan, six-engined variant of the still-unfinalized He 277 airframe design that could alternatively accommodate four of the troublesome, over-1,500&nbsp;kW output apiece [[Junkers Jumo 222]] 24-cylinder six-bank liquid-cooled engines, or two additional BMW 801E radials beyond the four it was originally meant to use.<ref>{{cite book |last1=Griehl |first1=Manfred |last2=Dressel |first2=Joachim |title=Heinkel He 177 – 277 – 274 |year=1998 |publisher=Airlife Publishing |location=Shrewsbury, UK |isbn=1-85310-364-0 |page=197 }}</ref> July 23, 1943, was the same day that the [[USAAF]] submitted a "[[letter of intent]]" to Convair, that ordered the first 100 production [[Convair B-36]] bombers to be built - itself a design first asked for by the earlier [[United States Army Air Corps|USAAC]] on [[Convair B-36 Peacemaker#Development|April 11, 1941]] - an enormous six-[[Pratt & Whitney R-4360|engined]], 70-meter wingspan design far superior to either the Heinkel He 277 or Focke-Wulf Ta 400 designs.<ref>{{cite web |url=http://www.globalsecurity.org/wmd/systems/b-36-production.htm |title=Weapons of Mass Destruction - Systems - Bombers - B-36 |author=<!--Staff writer(s); no by-line.--> |website=globalsecurity.org |access-date=December 12, 2016 |quote=Ensuing talks between Secretary of War Henry L. Stimson, Assistant Secretary of War Robert P. Patterson, and high ranking officers of the AAF, led Secretary Stimson to waive customary procurement procedures and to authorize the AAF to order B-36 production without awaiting completion and testing of the 2 experimental planes then under contract. Therefore, on 19 June General Arnold directed procurement of 100 B-36s. General Arnold became Commanding General of the AAF in March 1942 and was promoted to 4 star general 1 year later. His order, however, would be cut back or canceled in the event of excessive production difficulties. The AAF letter of intent for 100 B-36s was signed by Convair on 23 July...The letter of intent of '''23 July 1943''', supplemented by Letter Contract W33-038 ac-7 on 23 August 1943, gave way 1 year later to a definitive contract. Interestingly, the US. Government was not liable should a letter of intent be canceled. This was not so for the more often used letter contract which obligated funds.}}</ref>

Three prototypes of the Me 264 were built, but it was the Ju 390 that was selected for production. A verified pair of the Ju 390 design were constructed before the program was abandoned. After World War II, several authors<ref>Wagner and Nowarra 1971, p. 314.</ref> claimed that the second Ju 390 actually made a transatlantic flight, coming within 20&nbsp;km (12&nbsp;mi) of the northeast U.S. coast in early 1944, but this claim has since been discredited as Ju 390 V2 never flew. As both the Me 264 and He 277 were each intended to be four-engined bombers from their origins, the troubling situation of being unable to develop combat-reliable piston aviation engines of 1,500 kW (2,000 PS) and above output levels led to both designs being considered for six-engined upgrades, with Messerschmitt's paper project for a 47.5 meter wingspan "Me 264B" airframe upgrade to use six BMW 801E radials,<ref>{{cite book |last1=Griehl |first1=Manfred |last2=Dressel |first2=Joachim |title=Heinkel He 177 – 277 – 274 |year=1998 |publisher=Airlife Publishing |location=Shrewsbury, UK |isbn=1-85310-364-0 |page=187 }}</ref> and the Heinkel firm's [[1943 in aviation#July|July 23, 1943]]-dated request from the RLM to propose a 45-meter wingspan, six-engined variant of the still-unfinalized He 277 airframe design that could alternatively accommodate four of the troublesome, over-1,500&nbsp;kW output apiece [[Junkers Jumo 222]] 24-cylinder six-bank liquid-cooled engines, or two additional BMW 801E radials beyond the four it was originally meant to use.<ref>{{cite book |last1=Griehl |first1=Manfred |last2=Dressel |first2=Joachim |title=Heinkel He 177 – 277 – 274 |year=1998 |publisher=Airlife Publishing |location=Shrewsbury, UK |isbn=1-85310-364-0 |page=197 }}</ref> July 23, 1943, was the same day that the [[USAAF]] submitted a "[[letter of intent]]" to Convair, that ordered the first 100 production [[Convair B-36]] bombers to be built - itself a design first asked for by the earlier [[United States Army Air Corps|USAAC]] on [[Convair B-36 Peacemaker#Development|April 11, 1941]] - an enormous six-[[Pratt & Whitney R-4360|engined]], 70-meter wingspan design far superior to either the Heinkel He 277 or Focke-Wulf Ta 400 designs.<ref>{{cite web |url=http://www.globalsecurity.org/wmd/systems/b-36-production.htm |title=Weapons of Mass Destruction - Systems - Bombers - B-36 |author=<!--Staff writer(s); no by-line.--> |website=globalsecurity.org |access-date=December 12, 2016 |quote=Ensuing talks between Secretary of War Henry L. Stimson, Assistant Secretary of War Robert P. Patterson, and high ranking officers of the AAF, led Secretary Stimson to waive customary procurement procedures and to authorize the AAF to order B-36 production without awaiting completion and testing of the 2 experimental planes then under contract. Therefore, on 19 June General Arnold directed procurement of 100 B-36s. General Arnold became Commanding General of the AAF in March 1942 and was promoted to 4 star general 1 year later. His order, however, would be cut back or canceled in the event of excessive production difficulties. The AAF letter of intent for 100 B-36s was signed by Convair on 23 July...The letter of intent of '''23 July 1943''', supplemented by Letter Contract W33-038 ac-7 on 23 August 1943, gave way 1 year later to a definitive contract. Interestingly, the US. Government was not liable should a letter of intent be canceled. This was not so for the more often used letter contract which obligated funds.}}</ref>

===''Huckepack Projekt'' (Piggyback Project)===

===''Huckepack Projekt'' (Piggyback Project)===