05-03-05

Elite Prop Seneca III

A final screenshot showing the Seneca in a single-engine climb. The left engine has failed, the aircraft is climbing out slowly at blue line speed, achieving a "nice" rate of climb of slightly above 300 feet per minute.
 
Notice the lights on the annunciator panel, indicating from left to right:
*) Low oil pressure (because the left engine is failing)
*) Left vacuum low (because the left engine is driving this vacuum pump)
*) Alternator problem (each engine has an alternator to drive)
*) Right overboost (right engine is producing too much power)
 
The last overboost problem is a typical example of the advantages of flying a Seneca V, compared to the Seneca III. When setting the throttle full open, the manifold pressure on a normal aspirated piston engine is the ambient atmosphere pressure (hence somewhere around 29.92 inHg or 1013hPa at sea level, reducing when climbing). The Piper Seneca III/V has turbocharged engines that can boost the manifold pressure to 38 inHg up to altitudes of 10000 feet. Absolute maximum is 42 inHg. Above 42 inHg the engines can be damaged so you have an overboost warning on the Seneca III. This is what you see in this screenshot, the right engine is overboosted, the pilot needs to reduce the throttle to protect the engine. So on the Seneca III, in the high power range and at lower altitudes, the pilot has to be very carefull not to overboost the engine.
 
The Seneca V however is equiped with a wastegate, which controls this pressure automatically. Hence you won't get the overboost situation, unless in extreme conditions (or when the system breaks down). The pilot has to worry less about overboosting the engines when advancing the throttles, the system protects the engine. This is a really nice feature, especially when dealing with engine failures, stalls,...


22:46 Gepost door BraceBrace | Permalink | Commentaren (0) |  Facebook |

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