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I have not actually studied the ideal ram scoop opening. I know that Tracy is using a 3inch dia round scoop that would have about 7 inches of area, just a little smaller than the scoop I proposed. I want to keep the scoop as low as possible while retaining the performance. The snouts that stick up into the air are not the look I want. Does the scoop get smaller with a higher top end? What would it be for 240 mph? Jerry
On Tuesday, April 12, 2005, at 06:19 PM, Al Gietzen wrote:
Here is pic of the plenum (at this point a piece of 1/4 inch ply. The
ram air scoop will be 4 inches wide and two inches high.
Jerry:
Is the 2" x 4" the opening size? I think that is more than double the area
that would give the amount of ram air needed for a 2-rotor at, say, 120 kts.
So it will be spilling air and likely cause some amount of unwanted drag.
Ideally, a ram induction scoop is close to the area needed for near top
speed; and have radius on the entrance lip (about that of your index finger)
to minimize entrance loss when you are at low speed.
FWIW, I have no idea it any of this matters for what you're doing.
Al
Homepage: http://www.flyrotary.com/
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