DCS:BS cyclic centering

[astrospud]

I'm not sure where to post this, so I hope this is the right place.

 

When I want to lift off vertically in BS (from FARP), I have to pitch the cyclic a smidge forward, so that the diamond (in the control schematic) is just north of the natural rest position.

 

Is this because my X52 Pro is out of calibration or is this how the Kamov actually behaves?

 

Also, I find that in the course of a flight,the diamond in the control schematic generally ends up in the top right quadrangle, after much trimming.

Upon resetting trim, the ship pitches up wildly, thus I have to pitch forward whilst resetting trim.

 

Is this normal?

[slug88]

Yes, both behaviors are normal.

[26-J39]

All normal characteristics of the KA50, tho resetting trim during flight is a big no no.

[astrospud]

I tend to link the cyclic positioning after a bit of trimming, and the closeness of the StB side of the rotors.

What I mean by this is, in the external view, the Starboard side of the 2 rotor disks are much closer together than they are on the port side.

It has never seemed natural to me, as it just screams "imminent blade clash".

I'm guessing this is real world as well...?

[EtherealN]

Yeas, at higher air speed the lower disk will give more lift on the right side than the left side - and the opposite for the higher disc. This is because the "advancing" side of each disk goes faster through the air which works the same as an aircraft flying faster.

 

For this reason the faster you go, the closer the discs.

Also note that sharp right rudder input while in this mode can cause fatal crashes, be very careful when at high airspeed and if sharp right turns are required do remember to coordinate with temporarily reducing collective to zero.

 

The latter issue is specifically with right turns since right yaw is achieved in two ways - the rudder surface is obvious, but it also increases the angle of attack on the lower disc while decreasing the same on the higher disc in order to create different amount of torque and thus cause rotation. However, at very high airspeed this can be the final straw towards a rotor disc intersection.

[26-J39]

Yes the rotor dynamics are correct, all to do with advancing/retreating blades and the difference in the lift generated. Even in a conventional chopper (tail rotor) left or right cyclic input (depending on the aircraft) is needed for straight flight at speed.

[Woots]

One time, the shark started vibrating violently after starting the right engine. I was thinking WTF and went to an exterior view - there were blade pieces on the ground. Somehow, the blades had collided. Pretty cool. I was grounded until I found a new ride.

[sobek]

One time, the shark started vibrating violently after starting the right engine. I was thinking WTF and went to an exterior view - there were blade pieces on the ground. Somehow, the blades had collided. Pretty cool. I was grounded until I found a new ride.

 

Severe wind conditions is the only thing that can cause that. Or ground oscillation, but i never managed to cause that (the gear has special damping to counter that, IIRC), though Yo-Yo mentioned it was possible.

[Woots]

Severe wind conditions is the only thing that can cause that.

 

Yep. I was doing Dragon's training mission with severe weather. Wouldn't have thought it possible to have the Shark go Tango Uniform for shattered blades, but I proved it can happen.

Edited December 16, 2009 by Woots

[sobek]

Yep. I was doing Dragon's training mission with severe weather. Wouldn't have thought it possible to have the Shark go Tango Uniform for shattered blades, but I proved it can happen.

 

You're gonna prove that a lot, even without severe wind ;)