Thread: Discussion F22 Raptor Drawings - Update
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Old Feb 08, 2008, 01:54 AM
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Quote:
Originally Posted by nem3
...............
My goal was to have a constant area all the way to the fan blades. The problem is that the spinner cone on the front of the fan takes up a lot of area. And most intakes do not take that into account. So what I did with the new ones, is account for the area that is taken up by the spinner. So the intakes continue shrinking, from 31.65 sq. cm down to 29.10 sq. cm. at the start of the spinner. Then the intake follows the contour of the spinner to keep a constant 29.10 sq. cm. area all the way to the fan blades............
I think that this is not a good idea.
If you follow the spinner shape your ducts will have an abrupt deviation and this can cause a lot of drag even if section area is held constant.
I would rather go this way:The duct at spinner should have the same diameter of the fan.
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