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The Hermes 4 was the first British post-war airliner built to modern standards to go into service; 25 were delivered to BOAC for use on its Commonwealth routes, services beginning in August 1950. Normal accommodation was for 40 passengers, but alternative seating arrangements provided for a maximum of 74. Originally powered by four 1,565kW Bristol Hercules 763 radial engines, all were subsequently re-engined with 1,583kW Hercules 773s and were thereafter known as Hermes 4As.
| MODEL | Hermes IV |
| ENGINE | 4 x Bristol Hercules 763, 1566kW |
| WEIGHTS |
| Take-off weight | 39000 kg | 85981 lb |
| Empty weight | 25100 kg | 55336 lb |
| DIMENSIONS |
| Wingspan | 34.44 m | 112 ft 12 in |
| Length | 29.51 m | 96 ft 10 in |
| Height | 9.14 m | 29 ft 12 in |
| Wing area | 130.80 m2 | 1407.92 sq ft |
| PERFORMANCE |
| Max. speed | 563 km/h | 350 mph |
| Cruise speed | 435 km/h | 270 mph |
| Ceiling | 7470 m | 24500 ft |
| Range | 3200 km | 1988 miles |
| R Bovill, r.bovill(@)appletrees9.freeserve.co.uk, 25.08.2008 An extremely pleasant aircraft to fly. I flew them as an SFO during the late 1950s and the only serious problem I experienced was a failed oil cooler shutter on No 3 which meant the engine had to be shut down due to coring. We were northbound over France and heading for Blackbushe so it was no real problem at those temperatures in winter. The aircraft was, however, underpowered in really hot conditions and we flew therefore at night on long sectors e.g Malta-Kano in order to be able to take on the amount of fuel needed without exceeding the MTOW for met and runway conditions prevailing. The aircraft had on board a gyro-stabilised periscopic sextant and every hour, on the hour, one took a fix. This was never a problem as we were all thoroughly trained in astro navigation and in the absence of any other external navaid over a period of seven hours it was important that we did this. The aircraft was a very stable platform for using a sextant. (An aircraft of another company crashed in the desert after becoming lost as a result of not setting up a gyro compass correctly and not taking accurate fixes. Had they taken their fixes properly they would soon have found that they were off track and would have been able to take corrective action.) | | Roger Braga, upkeepmay43(@)hotmail.co.uk, 02.04.2008 Flew on a Skyways of London Hermes in 1957 troop flight from Blackbushe a/p to Singapore. Flight was not without incident. Firstly a 'long drop' of what felt like at least 1000ft whilst circling over Rome, left everyone shaken. Secondly, undershot approach to Basra/Iraq, only prompt action by pilot revving engines up to max to gain height and banging the a/c down onto the runway, saved us ending up in the Euphrates. What memories - thank god we flew back in an Air Charter Britannia. At least I'm still here to tell my granchildren. |
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