Aerodynamic Question.

[captainphil]

I was just curious for all you turbo-prop (single or multiengine) pilots out there. Can anyone tell me please are there any compensation designs on your aircraft to fight left turning tendencies designed by the aircraft manufacturer, or are you all fighting the stick and rudder? Thanks.

 

[jwp_145]

Yaw damp I'm guessing would help to counter those forces.

 

[ArcherII]

YD inop in our SW3, so aleiron/rudder trim and a bit of muscle here and there.

 

[Bogey]

On single engine aircraft, there is a tab on the rudder that helps counteract left turning tendencies.

 

[auw2fly]

On the TBM the engine is actually mounted on an angle a few (I think 3) degrees off center. Same with the Meridian.

 

[JustinS]

On the TBM the engine is actually mounted on an angle a few (I think 3) degrees off center. Same with the Meridian.

This is also the case with recip powered Bonanzas. I would imagine also the turboprop converted one. (I saw one at the airport I'm staying at this week...)

 

[TwoTwoLeft]

Vertical stab offset. Slight difference in the angle of incidence from the right & left wings on singles. Counter-rotating engines on twins.

Yaw dampers typically do not counter act LTTs. Their primary purpose to help control dutch roll and adverse yaw. If equipped, the rudder boost portion of the YD system will help.

King Airs, JetStars & Hawkers use a rudder bias system to help reduce rudder control pressures during an engine failure.

 

[jeflies]

I remember reading that all of those factors are in place to eliminate the tendencies during cruise. The other phases of flight its your expert aviator skills that eliminate them.


Sent from my iPhone

 

[Autothrust Blue]

I was just curious for all you turbo-prop (single or multiengine) pilots out there. Can anyone tell me please are there any compensation designs on your aircraft to fight left turning tendencies designed by the aircraft manufacturer, or are you all fighting the stick and rudder? Thanks.

Not that I've been made expressly made aware of. Lots and lots of rudder trim. Oh and if you're fighting, you're doin' it wrong.

The YD doesn't really help by design with asymmetric thrust, it's more to keep the airplane from sashaying. (It'll happily fly with the ball displaced and YD/AP engaged.)

 

[Crockrocket94]

I also recall the PA28s had a canted engine.

 

[dustoff17]

On the TBM the engine is actually mounted on an angle a few (I think 3) degrees off center. Same with the Meridian.

I also recall the PA28s had a canted engine.

Caravan is the same way. Not so sure how much it helps but makes me fear one that isn't canted......

 

[Capt. Chaos]

We put a Garrett on the front our caravan. Left turn fixed. The guys in ANC mounted it canted down and to the left to offset the right turn though.

 

[Boskru]

My vote goes to rudder trim and leg muscles!

 

[RICHARD5]

I was just curious for all you turbo-prop (single or multiengine) pilots out there. Can anyone tell me please are there any compensation designs on your aircraft to fight left turning tendencies designed by the aircraft manufacturer, or are you all fighting the stick and rudder? Thanks.

Firstly, let's get a handle on this drama. No one is "fighting" stick and rudder. That said, there are airframe designs which do counter the turning tendencies. This was known since WWI but most notably since the "golden age" prior to WWII.

 

[Tommay85]

On a 99, nothing that I'm aware of. Any speed changes require trim adjustments. Though, that might be because they're all bent. I used to fly a Baron as well and those would give you quite a pronounced torque roll to the left on rotation. That was a freight outfit as well, so maybe they too were all bent.

I've been reading whatever information is available online for our Brasilias, and that thing sounds like you've got one hand down on the pedestal fiddling with the trim constantly. The Metro's tail is too tiny to do anything. No idea on the 1900.

 

[Mark815]

Besides yaw damp, the PT6 on the Pilatus is canted down and left 2 deg. Also if you notice, we have that radome all the way on the end of our right wing. Not just for looks, but actually helps with the left turning tendency.

 

[etflies]

On a 99, nothing that I'm aware of. Any speed changes require trim adjustments. Though, that might be because they're all bent. I used to fly a Baron as well and those would give you quite a pronounced torque roll to the left on rotation. That was a freight outfit as well, so maybe they too were all bent.

I've been reading whatever information is available online for our Brasilias, and that thing sounds like you've got one hand down on the pedestal fiddling with the trim constantly. The Metro's tail is too tiny to do anything. No idea on the 1900.

If you so much as look at the power levers, change the pitch, adjust in your seat or fart in flight in the Bro you're going to have to re-trim the airplane.

 

[Pilotforhire587]

Electric rudder trim. Even with an operative YD on the Dash 8 it does nothing for left turning tendencies. Adjusting the rudder trim with every change in power becomes a habit after a while.

 

[z987k]

Counter-rotating engines on twins.

I don't know of any turbo props that are counter rotating.

 

[Pilotforhire587]

I don't know of any turbo props that are counter rotating.

There aren't any, as a matter of fact the only turbines made in north america that have a prop that rotates to the left are certain tpe331 models, as they have an extra reduction gear that changes the direction or rotation.