B747 technical questions

Date:         10 Jul 97 17:46:12 
From:         187 <lowwol@christine.pacific.net.sg>
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Some questions:-

1) For the 5th engine which can be installed on the pod under the wings,
can it be used as part of the aircraft's engine thereby making the
aircraft run on five engines?

2) What is the best EPR number to be attained?  Is it the smaller the
number the better or the greater the better?  Since EPR=turbine
discharge pressure: compressor inlet pressure.  And why?

3) What is in the inside of an aircraft tyre?  I mean is it
filled/pumped up with air like that of car tyres or is it built as a
solid whole piece??

Thank you.

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