Aces High Bulletin Board

General Forums => Aircraft and Vehicles => Topic started by: Puck on April 10, 2002, 09:11:21 AM

Title: Thrust induced yaw in the P38
Post by: Puck on April 10, 2002, 09:11:21 AM

When the P38 is up and you loose an engine you get a substantial amount of thrust induced yaw, which is fine; you can still fly the aircraft.  On the ground you can't taxi on one engine.  I ran into this last night, and tested it off-line.

Is that "right"?  I've seen many two engine prop jobs taxi on one engine.  It's not something that needs fixed; it's not important, I was just curious.

I was at the end of the runway this morning, one engine turning, full rudder/nose wheel, brake under the turning engine set, and all it would do is pivot around the opposite main.  Pretty pathetic  :)

Title: Thrust induced yaw in the P38
Post by: Tac on April 10, 2002, 11:01:01 AM

the 38 would not be able to taxi with one engine. You can control it during taxi with 1 engine, but you have to be already moving, but if you are stopped and try to taxi on 1 engine you'll just break-dance where you stand.

Title: Thrust induced yaw in the P38
Post by: Citabria on April 10, 2002, 11:01:58 AM

is it accurate?

YES! :)

Title: Thrust induced yaw in the P38
Post by: SFRT - Frenchy on April 10, 2002, 05:23:40 PM

Thrust over the wing should not induce a yaw but a roll :p

Title: Thrust induced yaw in the P38
Post by: niklas on April 10, 2002, 06:15:51 PM

a bit ot, but maybe interesting: A unpleasant effect for an twin engine aircraft with counter rotating propeller in flight during yawing is a nose down or up pitch, because the elevator is hit by an unsymmetrical up or down propwash stream. For an aircraft with two propeller rotating in the same direction, the sum of up-down propwash stays the same during yawing. Nevertheless counter rotating propeller have much more advantages

niklas

Title: Thrust induced yaw in the P38
Post by: icemaw on April 11, 2002, 01:22:04 AM

I dont know but if 38 has steerable nose wheel it could taxi just fine on 1 eng same with any plane with steerable nose wheel:p

Title: Thrust induced yaw in the P38
Post by: chunder' on April 11, 2002, 01:34:14 AM

Quote

Originally posted by icemaw
I dont know but if 38 has steerable nose wheel it could taxi just fine on 1 eng same with any plane with steerable nose wheel:p

Unfortunately, the P38 has a free-castoring nose wheel; hence the single engine merry-go-round effect.