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Folding-Fin Aerial Rocket

rocket

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General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionJul 29, 2026
Entity authorityQ44169 ↗
Source-derived summary

The Mk 4 Folding-Fin Aerial Rocket (FFAR), also known as "Mighty Mouse", is an unguided rocket used by United States military aircraft. It was 2.75 inches (70 mm) in diameter. Designed as an air-to-air weapon for interceptor aircraft to shoot down enemy bombers, it primarily saw service as an air-to-surface weapon. The FFAR has been developed into the modern Hydra 70 series, which is still in service.

History

The advent of jet engines for fighters and bombers posed new problems for interceptors. With closing speeds of 1,500 ft/s (457 m/s) or more for head-on interceptions, the time available for a fighter pilot to successfully target an enemy aircraft and inflict sufficient damage to bring it down was increasingly small. Wartime experience had shown that .50 caliber (12.7 mm) machine guns were not powerful enough to reliably down a bomber, certainly not in a single volley, and heavy autocannons did not have the range or rate of fire to ensure a hit. Unguided rockets had been proven effective in ground-attack work during the war, and the Luftwaffe had shown that volleys of their Werfer-Granate 21 rockets, first used by elements of the Luftwaffe's JG 1 and JG 11 fighter wings on July 29, 1943, against USAAF bombers attacking Kiel and Warnemünde, could be a potent air-to-air weapon. The summer and autumn of 1944 saw the adoption of the folding-fin R4M unguided rocket for use underneath the wings of the Messerschmitt Me 262 jet fighter for bomber destroyer duties against the USAAF's Eighth Air Force heavy bombers.

The FFAR was developed in the late 1940s by the US Navy's Naval Ordnance Test Center and North American Aviation.

Editorial summary

This brief starts where responsible research should: with the source description of “Folding-Fin Aerial Rocket” as rocket. Everything that follows is an evidence route, not borrowed authority.

Editorial reviewA concise reference frame for defining the subject, testing terminology and identifying the institution closest to the evidence. The current lead gives the account dated anchors—1943, 1944—that can be checked directly. The selected authority fields contribute no independent date. The account is most persuasive where Folding-Fin, Aerial and Rocket can be independently traced.
Editorial analysis

Why this record matters

The subject matters to the general reference register because the source frames it as rocket. Its deeper value depends on whether names, dates, institutions and citations support that framing.

Evidence profile

Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Jul 29, 2026. The linked authority identifier is Q44169. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1943 and 1944.

Critical limits

A concise general-reference account can conceal disagreements about scope, terminology or the weight assigned to individual sources. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

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Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

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  2. Expand the search: follow Folding-Fin Aerial Rocket primary sources, Folding-Fin Aerial Rocket archive and Folding-Fin research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

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Source & attribution

This entry incorporates text from “Folding-Fin Aerial Rocket” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.