Extract from Jet Power Magazine No 6/2010, Page 60 "Jet Shop Info & New Items"

"The Pico SMM....
...Experts also like to use the gyro as ABS control for the brake valve."

Anyone care to explain ? (I use a blob of silicone grease as my ABS)
Thanks.

You have to be an "expert" to understand.

a drip under pressure?

Just thinking out loud here, but you could probably use a heading hold gyro on the brake valve and if the plane veres off line it would reduce the braking effect until it corrects then reapply the brakes. This would reduce the problems with brakes causing the plane to vere off course. Planes with a wide stance have a bigger problem than those with a narrow stance such as a F16-F18

PS: But I am no expert

That would be an Ex-Drip under pressure... A drip under pressure is just a spurt!

Your blob of silicone is for Anti-skid. The gyro is for ABS...if your an "expert".

Perhaps the idea is this: when a gyro on a surface sees a stick command, it arranges the throw of the surface to provide a constant acceleration. with the stick at zero, holding zero acceleration is a special case.

So I guess the idea here is to put the gyro in the plane as if controlling the pitch axis, then at zero brake input, it applies no brakes, when the "stick" (in this case the brake level/knob) is deflected, the gyro feedback loop applies the brakes till a constant acceleration proportional to the stick input is generated. This would not technically be "ABS" but it would, if I understand this right, provide a measured deceleration controlled by the gyro feedback loop.

maybe???

Dave

????

Maybe one of these would work????
[link]http://home.comcast.net/~steveham21[/link]

Interesting! With a on/off brake valve, I can see how it would be a bit like an ABS system. When the brake are on, the nose drops and the gyro (on pitch) causes the brakes to release and then the cycle starts again. With a BVM smooth stop or UP-6 valve the result might be good constant speed braking without a lot of air loss.

Has anyone tried this?

Arnaud<br type="_moz" />

Where are the "experts" that are reported to be using gyros for an ABS? Maybe we are just trying to figure out a way to substantiate an inaccurate magazine article? Is it possible the author of the article just didn't understand what he thought he overheard from someone he didn't know and had so little background to question what he didn't understand?

George

Dave i dont think air and the elastick lines we use for braking are so presice in rensponce for a dyro to control "untilock"

the only i can think relate gyro and brakes is using gyro on the stering frond wheel.

this way you eliminate the left right tendency while braking the jet causing by uneven braking power on the mains.


now IMHO experts who need a gyro controled brake valve to help them brake down
they should try fishing as a hobby insted[sm=thumbup.gif]

Here's a thought from an old truck mechanic that has never used a gyro, so this is just a guess :
2 brake valves, one for each main wheel brake, connected to the receiver through a gyro.

It could be set up so that if the right main wheel locks causing yaw to right, the gyro reduces air pressure (servo throw) to right main brake valve.

This would not be a true ABS in that a wheel lock on both sides will not be prevented.

using a pitch axis gyro might work, but im sure would cause a lot of problems with flare and brakes etc...

about using a yaw gyro to release brakes if a yaw deflection is caused is not a good idea, since gyros correct servos BOTH ways - i.e. one right deflection would release brakes but left deflection would apply brakes. that is unless you use 2 brake valves which is a mess.

im no "expert" but i'd love to know what the author meant too.

He forgot about the flux Capacitor . Or use some coil wire about 30 turns on the wheel axle and installing magnet on the wheel hub. Then shorting the connectors will give you (Dynamic Braking w gyro) .

Real experts don´t need ABS.




Just kidding.. it´s a creative idea.


Enrique

I haven't seen Mr Gladwin online for a few days

Said tongue in cheek David

It might just be a case of sales & marketing brainstorming (aka B/S) uses for their gyro, or the article got fuzzy logic'ed up when translated from German to English.

It would be intersting to know if the gyro is detecting yaw, pitch or fore/aft jerks in this application !

I've not understand now how they can use a gyro as ABS, but i've seen in a Saab Grippen (gear look like F-16 one) a Gyro on the front wheel to ensure straight breaking and that was the good idea for this plane. During the earlier flight without gyro, breaking was a heart stoping action as the pilot never know wich side the plane should go...

Or maybewe are misunderstanding this mount. Maybe the author consider that if breaking is "good" the plane should go straight, and when the wheels are blocked the plane should drift. As this drift should be detected by the gyro (yaw axis), this one should release brakes to stop the drift? That is an ABS, ok... Maybe someone that read this paper should confirm ?

My2 cents...

Duncan,

Don't ask me mate, I haven't a clue about what is meant in this context, I'll leave it to you guys to discuss, wouldn't want anything I say to be misconstrued !!!

Regards,

David G.