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Old 04-18-2012, 09:33 AM   #11 (permalink)
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The boattail was solely to reduce drag as the 747 had a very short range and had to make too many refueling stops between CA and FL when carrying the shuttle with the rocket nozzles exposed. That boattail shape is the shortest curve that will retain attached airflow and similar in shape to that found on the Questair Venture and on some helicopter bodies.

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Old 04-18-2012, 09:50 AM   #12 (permalink)
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Quote:
Originally Posted by KamperBob View Post
More casual than hard core so I missed the tail cones. I wonder if it was to (a) reduce drag for piggy backing
It's there to reduce drag, to not blanket out the 747's tailfin and avoid buffeting of the 747's tail.

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If (a) it seems steeper than ideal per template but top view would help complete the picture.
It also tapers in plan view.
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Old 04-18-2012, 12:40 PM   #13 (permalink)
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Flying without the tail cone caused massive buffeting on the 747 as well as loss of rudder control hence the 2 extra vertical stabilizes on the 747.


The space shuttle carrier and Enterprise flew several glide tests in the 70s without the tail cone.


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Old 04-18-2012, 02:18 PM   #14 (permalink)
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Old 04-18-2012, 05:31 PM   #15 (permalink)
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Enterprise

Quote:
Originally Posted by tjts1 View Post
Flying without the tail cone caused massive buffeting on the 747 as well as loss of rudder control hence the 2 extra vertical stabilizes on the 747.


The space shuttle carrier and Enterprise flew several glide tests in the 70s without the tail cone.


Enterprise flew at least one glide test with the boat tail in place and it doubled the glide distance.
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Old 04-18-2012, 05:37 PM   #16 (permalink)
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