Terminology
02-14-2003, 03:22 AM
#3
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Terminology
ROG-roll on ground, to let an airplane take off using its own power, versus hand launching it. Used a lot in rubber band and F/F planes, well at least that's what it use to mean a long time ago.
02-14-2003, 06:24 AM
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Originally posted by P-51B
Rise Off Ground, then what GrnBrt said.
Rise Off Ground, then what GrnBrt said.
02-14-2003, 01:56 PM
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Terminology
ROG is used to distinguish a ground takeoff from a handlaunch takeoff. ROW stands for Rise Off Water. These terms originated with freeflight competition classes a long time ago.
Dave Segal
Dave Segal
02-14-2003, 06:25 PM
#11
Terminology
Heres a few more,
Prop wash - the bucket of soap and water you clean the prop with
bi-plane - what you say when your radio quits working
try-plane - your first attempt at flying
ARF - All ready to fix or something your dog says when he eats your plane.
RTF - Ready to fix, right out of the box. Pre broke.
Winch - the gal you left home.
Sail Plane - the one you just flew and crashed, "fer sail"
Fuse - the wick in the fire cracker
fire wall - the thing you stand behind when your gasser backfires and burns.
canopy - the bucket under the bench when the outhouse if full.
Push Rod - how to get him out of the way of the plane coming at him.
Elevator - the big square building they load grain into from trucks, the one your plane just hit.
Ok, they were pretty bad. Must have not had much to do eh.
Prop wash - the bucket of soap and water you clean the prop with
bi-plane - what you say when your radio quits working
try-plane - your first attempt at flying
ARF - All ready to fix or something your dog says when he eats your plane.
RTF - Ready to fix, right out of the box. Pre broke.
Winch - the gal you left home.
Sail Plane - the one you just flew and crashed, "fer sail"
Fuse - the wick in the fire cracker
fire wall - the thing you stand behind when your gasser backfires and burns.
canopy - the bucket under the bench when the outhouse if full.
Push Rod - how to get him out of the way of the plane coming at him.
Elevator - the big square building they load grain into from trucks, the one your plane just hit.
Ok, they were pretty bad. Must have not had much to do eh.
02-14-2003, 09:26 PM
#15
Terminology
Well, that depends. the power of the engine has a lot to do with it. a 10x20 WOULD produce more thrust, if your engine can swing one. But, for example, if your engine runs great with a 10x6, then a 10x8 might be too much for it and the engine can't produce the power it can with a 10x6. You could however try a 9x8 and get better (or worse) results. It's a give and take thing.
02-14-2003, 09:57 PM
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Yes, I realize those sizes are unrealistic, but they were more or less to make it easier for me to visualize them. Thanks for the help guys!
02-14-2003, 11:37 PM
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Both props produce the exact same thrust at the same rpm, they will just produce it at different forward airspeeds. The 10x1 will probably produce it at a negative airspeed, the 10x20 will produce it at a very high forward airspeed. The thing to remember is that the thrust for any prop is produced at an optimum angle of attack of the blade. When there is more air velocity traveling through the prop from the front, then angle of attack of the air hitting the prop blade is reduced. If you get the airflow moving fast enough, and keep the prop spinning at the same RPM, then the air will have the same angle of attack as the 10x1 prop sitting still. The trouble is that it is a converging dynamic process. As you increase the forward airstream, the load on the prop goes down and the engine will speed up. All in all, lower pitch props will reach maximum thrust lower down on the forward airspeed scale, higher pitch props will reach that same thrust higher up on the forward airspeed scale. A low pitch prop, once the forward airspeed exceeds a value such that the angle of attack is zero or negative (such as in a dive at idle) , will actually be working in reverse, slowing the plane down. This is called downline braking.
