RPM verses HP ???
03-31-2008, 05:02 PM
#51
RE: RPM verses HP ???
MATT I finally realize what your going on about. you thought when i said (rated rpm)i ment max rpm . i was talking about the rpm the engine is rated for max hp.i see now how that could be misread.
04-01-2008, 01:13 AM
#52
RE: RPM verses HP ???
ORIGINAL: RAMMJETT
MATT I finally realize what your going on about. you thought when i said (rated rpm)i ment max rpm . i was talking about the rpm the engine is rated for max hp.i see now how that could be misread.
MATT I finally realize what your going on about. you thought when i said (rated rpm)i ment max rpm . i was talking about the rpm the engine is rated for max hp.i see now how that could be misread.
Mark
04-01-2008, 04:36 AM
#53
My Feedback: (29)
RE: RPM verses HP ???
ORIGINAL: dick Hanson
just because --that's why your numbers are not too meaningful but - ducted fans are horribly bad at producing thrust
Now ask this
which produces the most thrust
a 6" prop in free air or a 6" prop in a duct?
each with the same hp input
ORIGINAL: Kweasel
Why does it take 4HP for a ducted fan make the same thrust as 2HP can with a propeller?
Why does it take 4HP for a ducted fan make the same thrust as 2HP can with a propeller?
Now ask this
which produces the most thrust
a 6" prop in free air or a 6" prop in a duct?
each with the same hp input
04-01-2008, 08:48 AM
#54
RE: RPM verses HP ???
when applying force of any kind (you must find the most efficient way for that medium)air has a poor transfer of energy (big slow moving props work best)ducts are usally comparably smaller than props and induce a considerable amount of drag.thier purpose however is to increase the speed of air not efficiency.compairing apples to oranges.but fun to think about.(what if you put a prop in a venturi)
