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Forum: Rumours & News

29th Apr 2016, 07:18

Replies: 82

Solar Impulse

Views: 43,771

Posted By DaveReidUK

Neat approach. :ok: Dividing that...

Neat approach. :ok:

Dividing that per-aircraft value by 4 gives a per-engine figure of around 16 MW in the cruise.

Interestingly, that's almost identical to NASA's value for the 747/JT9D -...

Forum: Rumours & News

28th Apr 2016, 18:27

Replies: 82

Solar Impulse

Views: 43,771

Posted By DaveReidUK

Well that depends how you define "efficiency" -...

Well that depends how you define "efficiency" - if you use SFC as a measure, it's roughly twice as good on the ground at takeoff thrust compared to the value in the cruise. In fact you could argue...

Forum: Rumours & News

28th Apr 2016, 15:59

Replies: 82

Solar Impulse

Views: 43,771

Posted By DaveReidUK

If you really believe that you can get 80,000 lbf...

If you really believe that you can get 80,000 lbf out of a Trent in the cruise at 40,000 ft, I would get on the phone to Derby and Toulouse straight away and let them in on the secret.

Forum: Rumours & News

28th Apr 2016, 15:30

Replies: 82

Solar Impulse

Views: 43,771

Posted By DaveReidUK

I think you need to read that example more...

I think you need to read that example more carefully.

It calculates, based on NASA data, that a 747-200 in the cruise generates around 16 MW per engine.

The Trent 900 develops roughly...

Forum: Rumours & News

28th Apr 2016, 06:25

Replies: 82

Solar Impulse

Views: 43,771

Posted By DaveReidUK

The OP appears to have multiplied take-off thrust...

The OP appears to have multiplied take-off thrust by cruise speed. :O

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