Wheel Brake Effectiveness

[roadrabbit]

:(

 

I have set my wheel brakes correctly (Saitek Pro Pedals), so that they work according to how much toe deflection is given. The profile under 'Options' shows full braking with full toe deflection.

 

However .........

 

Lining up for take-off it tells you to set 90% core RPM and check instruments. My pal can do this with brakes set full on and gets no forward movement of aircraft. If I do it I finish up sliding across the runway and generally finish up on the grass.

 

Any ideas?

[mhe]

If you line up and apply power while holding the brakes, how can you end up in the grass? Is there any asymmetry in your brakes going on? I'd assume if you just brake to little, you'd at least be going straight.

[Sorin]

Test your brakes real action by doing Control-Enter to see the axis and then apply brake.

This is also useful for testing your joystick and trim.

[roadrabbit]

LIne up? ;)

 

I take the point, but the question is why am I moving at all? In another life we would never dare set 90% against the brakes, but then each engine did produce over 75,000 lbs thrust! Other Hog pilots seem to be able to stand still when applying 90% power and I was just wondering why I can't replicate (like fornicate, only less interesting!) it when I do it.

 

The simple answer is for me to to NOT set 90%, but use a lower figure.

 

Maybe linked, but the landing roll-out seems quite long cf. the take-off run - is it that the brakes are just not very good? :music_whistling:

[roadrabbit]

Seen the profile curve under 'Options' - seems to indicate full brake per full deflection

[Sorin]

Seen the profile curve under 'Options' - seems to indicate full brake per full deflection

 

That can be misleading because it is not easy to tell if when pedal is zero the brake axis is zero. It can be pedal 0 axis 100%.

Try Control-Enter, you may be surprised...

[Konrad Friedrich]

Hmmm...

have you tried to assign the brakes to a key and tested what happens?

maybe the potis of your Saitek pedals are wearing out and start to 'spike'?

 

I use the paddle switch of my stick to hold the brakes.

And I can easily hold the plane with 90% core rpm.

 

Btw: each of the TF34 engine produces ca. 9,250 lb (or ca. 40 kN) not 75000 lbs.

Which would be a funny ride on the cannonball, though... :joystick:

[roadrabbit]

The reference to 75,000 lbs thrust was a reference to a previous RW a/c on which I had the pleasure of being an instructor - it was a comparison thing. ;)

[FreeFall]

Roadrabbit, are you sure you have inverted the axis?

[roadrabbit]

Ah, joy! The problem was that I wasn't pushing the toe brakes far enough :doh:

 

Now that I do push them all the way they hold the a/c stationary at 90% rpm. The pedals do show full deflection on the 'Contrrol Enter' display, too.

 

Thanks for all the inputs - much appreciated.