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Airliners.net: Cessna 421 & 414 (470 words) |
 | The lineage of the 421 and 414 traces back to the 411, the 421 beginning life as a pressurised development of the 411. |
| First improvements to the 421 were offered with the 421A of 1969, but the 421B Golden Eagle of 1970 featured a number of significant improvements including lengthened nose and wing span, while the engines retained their power to higher altitudes than before. |
| The final expression of the 421 was the 421C available from late 1975, with a bonded wet wing and no tip tanks, higher vertical tail, more efficient props and new trailing link undercarriage. |
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Markarian 421 (87 words) |
| Markarian 421, the Brightest Known TeV Gamma-Ray Blazar, by John Mattox (WEBT project) |
| Markarian 421 across the spectrum, by Bill Keel |
| Active Galaxy Markarian 421 by Michael Oates (Manchester Astronomical Society) |
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