Aerodynamic Question

[Austria]

Who knows the real reason for the angle and set up of the horizontal stabilizer on the tail of the Schweizer?

 

I understand the reason for the vertical stabilizer, but the position of the horizontal is giving me some troubles!

 

I would also like to find some published information on the canopy spoiler which was added after some bad accidents on practice autorotations with wrong pedal input!

 

Thanks in advance,

 

Austria  

[jimbo2181]

The canopy spoiler was added because of the dutch roll tendency which was actually due to the angled stabalizer.  Thats all I really know though...sorry.

[CJ Eliassen]

The horizontal stabilzor applies a downward force to counter act the downward pitching of the helicopter in forward flight.  Thrust is inline with the rotor system, but the center of drag is much lower, so the nose pitches down.  All single rotor helicopters have some sort of horizontal stabilzor.

[veeany]

The horizontal stab is tilted nose up to prevent a nose pitch up tendency on transition, the downwash would strike the stab if it was flat and cause a tail down pitching moment which would require a big cyclic input to overcome at such low airspeed.

 

The canopy slat is to prevent air disturbed by the canopy from impinging on the horizontal stabiliser in forward flight.

 

Both of these are straight from a technical contact at the factory last year.