advantage of bogie beam

[Torstennnn]

although this may seem trivial to most of you -
i (having no experience with any heavy aircraft)
wonder what the advantages of a bogie beam are!

and could anyone explain to me, how and in which aircraft the brakes are torque limited?

[411A]

wonder what the advantages of a bogie beam are!


It allows both sets of wheel assemblies to be installed on one strut.
The early design of the B-36 bomber used one wheel only (each side).
When the design was changed to four wheels (each side), two struts were tried, found unsatisfactory, so the bogie beam concept was tried, and proved very satisfactory.

[Storminnorm]

Bogie-beams distribute A/C weight more evenly, via generally
4 mainwheels as opposed to one or two.
Wheels and brake units can be made smaller, hence lighter.
More brakes = better stopping distances.
Hope that helps.
PS. 8 twin tyred wheels on the Vulcan. Total of 18 tyres.
Bit like the 747, but smaller. And only 2 Main landing gears.

The DC 8 early aircraft also had a "swivelling" bogie-beam.
Unlocked on tight turns to ease stress on beam and wheels.
Down-side was they regularly broke.

What do you mean by"Torque limited"?
Practically all brakes have speed sensors to prevent skidding
by overpressurizing the brake units by controlling the hydraulic
pressure entering the brake units. Judged by sensing wheel speed
and rate of change of wheel speed.

Cheers, Norm.

[Torstennnn]

torque limitation of brake power is quoted from the jar-fcl questions catalogue -
i don't have a clue what's meant!

[Krystal n chips]

Torque limitations on brakes

Could you possibly quote the question fully regarding the above from the JAR please. That way, you will most certainly get the clarification and answer to your query on here. As it is, there are too many possibilities to consider.

[Storminnorm]

I think it must mean anti-skid, but it's a bit confusing.

Never land with the parking brake on. Is that it?

[BigJoeRice]

"The brake rods transmit brake torque to the strut. They also
allow brake rotation as the truck position changes". B777 AMM 32-45-00.

Perhaps something to do with designing the strut to accommodate the torque generated or dissipated by the brakes during braking operations??

[Storminnorm]

Yup! I reckon that's it Big Joe.

[mustafagander]

The B744 has a brake torque sensor which limits the max brake torque generated AFAIK. Some times the techies will dive into the CMC and "reset" the limiters if there is a tech log snag or an EICAS message.