jetcareers - View Single Post

flyover · August 18th, 2004, 08:04

[ QUOTE ]
Most likely to fulfil some short field, steep climb gradient requirement for particular operations. Remember the FAA considers Second Segment Turbo-Jet Climb performance with One Engine Inoperative... In a 2 engine airplane, you loose 50% of your thrust, in a 3 engine airplane you loose 33% of your thrust, in a 4 engine airplane, you have only lost 25% of your thrust...

On all Turbo-Jet departures, you calculate your climb gradient based on One Engine Inoperative (OEI), a 4 engine airplane does MUCH better with 3 running than a 2 engine airplane does on one...

[/ QUOTE ]

Ding-ding-ding. That is exactly right. This airplane was initially marketed as a STOL jet. It's target market was to serve smaller airports in Europe. Aspen Airways bought them to use on high altititide short runway operations they had been flying with Dash-7s. It was a very specialized jet that just kept selling.

August 18th, 2004, 08:04	#20
flyover Old Skool Join Date: Mar 2004 Location: Georgia Posts: 3,389	Re: Why four engines? [ QUOTE ] Most likely to fulfil some short field, steep climb gradient requirement for particular operations. Remember the FAA considers Second Segment Turbo-Jet Climb performance with One Engine Inoperative... In a 2 engine airplane, you loose 50% of your thrust, in a 3 engine airplane you loose 33% of your thrust, in a 4 engine airplane, you have only lost 25% of your thrust... On all Turbo-Jet departures, you calculate your climb gradient based on One Engine Inoperative (OEI), a 4 engine airplane does MUCH better with 3 running than a 2 engine airplane does on one... [/ QUOTE ] Ding-ding-ding. That is exactly right. This airplane was initially marketed as a STOL jet. It's target market was to serve smaller airports in Europe. Aspen Airways bought them to use on high altititide short runway operations they had been flying with Dash-7s. It was a very specialized jet that just kept selling.