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In a message dated 12/14/2005 11:39:07 A.M. Central Standard Time,
REHBINC@aol.com writes:
Try this,
Your engine is an air pump. For a 4
cylinder aircraft engine each revolution has 1 cylinder drawing in air, 1
compressing air, 1 firing and 1 exhausting combustion products.
Thus, 1 revolution consumes 1/4 x 360 cubic inches or 90 ci or .625 cubic
feet. At 2700 rpm and WOT, that's 2700 x .675 cf or 1688 cfm. Lbs/Hr
depends on air density.
Scott,
Further to my last post and in answer to my own question, you appear to
have divided cubic inches by 144 to get cubic feet. Should have divided by 12
cubed or 1728. I did the same thing, which results in 12 times too much
carburator.
I think we've been out of school too long.
Rob,
Hmmmm..... cube means 3 dimensional......... Oh well, that's why you
guys are out there..... What a way to end the year. On 1/1/06, at 12:02
am I will have made no mistakes in the new year (Unless ???????)
You are right. 90 ci / 1728 = .0521 cubic feet. 2700 x .0521 =
141 cfm.
But, you missed an additional error in that .625 somehow became
transmogrified to .675 later in the miscalculation.
I am going to face the corner now. Maybe I need more meds.
Scott
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