Horizontal stabiliser trimming during flight

[303_Bies]

How to trim horizontal stabilisers in Bf-109 and FW-190 to achieve maximum speed?

Should i trim them to just remove forces on the stick?

Or even more on the nose and pull the stick a little?

 

cheers

[Fidelity]

Trim so the aircraft flies in the way you would like it to behave. If you are putting in input against what the trim is doing you will fly slower and it will be tiring. You will achieve max cruise speed by trimming for level flight.

[AndyJWest]

In real life, the moving horizontal stabiliser is a trimming device like any other. It has no magic drag-producing properties. It may be marginally more aerodynamically efficient than a trim tab, that is all. Use it in game for the purpose it was designed for.

[JaffaCake]

In real life, the moving horizontal stabiliser is a trimming device like any other. It has no magic drag-producing properties. It may be marginally more aerodynamically efficient than a trim tab, that is all. Use it in game for the purpose it was designed for.

 

 

I wouldn't call it marginal when even 5kmph matters.

 

Stabiliser is different from trim tabs in that the entire surface moves to adjust - so you do not have L shape configuration that trim tab / elevator creates, increasing the drag. 

 

From the POV of stabiliser, elevator and trim tabs are mini-airbrakes.

Edited February 13, 2018 by JaffaCake

[AndyJWest]

I wouldn't call it marginal when even 5kmph matters.

 

Stabiliser is different from trim tabs in that the entire surface moves to adjust - so you do not have L shape configuration that trim tab / elevator creates, increasing the drag. 

 

From the POV of stabiliser, elevator and trim tabs are mini-airbrakes.

 

I know how it works. If you have any actual data on the relative aerodynamic efficiency of movable stabilisers versus a conventional trim tab system, please provide it. Aircraft design is a matter of compromise, based as far as possible on actual data, rather than on numbers puled out of a hat and on waffle about 'mini-airbrakes'.

[JaffaCake]

I know how it works. If you have any actual data on the relative aerodynamic efficiency of movable stabilisers versus a conventional trim tab system, please provide it. Aircraft design is a matter of compromise, based as far as possible on actual data, rather than on numbers puled out of a hat and on waffle about 'mini-airbrakes'.

 

 

I am not sure where you happen to see any of the "rather than on numbers puled out of a hat and on waffle about 'mini-airbrakes'.". I provided no numbers. I gave intuitive explanation why stabilisers are more efficient than trim tabs / trimmers.

Edited February 13, 2018 by JaffaCake

[AndyJWest]

I am not sure where you happen to see any of the "rather than on numbers puled out of a hat and on waffle about 'mini-airbrakes'.". I provided no numbers. I gave intuitive explanation why stabilisers are more efficient than trim tabs / trimmers.

 

"even 5 kmph matters" looks like a figure to me. In any case, you can't just make claims about something being 'more efficient' without considering the consequences. A trim-tab system is a lot less demanding structurally than having to move the whole stabiliser on bearings, adding mass just where you don't need it, and you may well lose some of the aerodynamic advantage because you can't make the stabiliser-fuselage junction as smooth as you can with a fixed fillet. moving the stabiliser for trim was hardly a new idea in the 1930's, and the fact that it wasn't more widely used suggests to me that the benefits may well not have outweighed the costs.