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Date: Tue, 02 Aug 2005 17:36:30 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Pressure differential
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Another Delta builder has done some testing and come back to me with 
some hard data for the pressure differential between the wheel wells and 
the wing's trailing edge.  A mamometer with a line terminated in both 
places gave:
- 1/16" differential during taxi
- 1.25" takeoff/touchdown
- 1" during climb out (100 mph IAS)
- 2.25" with the gear down
- 2" during base and final

I sure someone has, but I don't remember anyone quoting the pressure 
differential across their radiators.  Do these numbers look workable?  
The airplane doesn't have a scoop dropping down as tested, and the front 
edge of the wheel well is squared off.  I would expect these 
modifications to significantly increase the numbers, but if this is 
sufficient neither one may be necessary.

These numbers are not from a duct with air passing through it, but just 
points on the solid surface of the aircraft.  Will that make a huge 
difference?

-- 
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