Re: B747 technical questions

Date:         28 Jul 97 01:13:27 
From: (JWizardC)
Organization: AOL
References:   1
Followups:    1 2 3
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>For the 5th engine which can be installed on the pod under the wings

To my knowledge, the only time a fifth engine has been added to the B-747
is during testing of new engine designs; a la B777. In this case, the
fifth engine can be and is used during flight.

>What is the best EPR number to be attained?

The larger the EPR the better. As you said, EPR is the ratio of engine
inlet pressure to exhaust pressure. An EPR of 2.0 at sea level 'standard
day' means that if the inlet pressure is 14.0 PSIA, the outlet pressure is
28 PSIA.

>What is in the inside of an aircraft tyre?

Airplane tires are filled with nitrogen, since it expands and contracts
less with heat and cold. Also, it has the added benefit of not sustaining