EddieWeeks

If I built a device that would refill an airplanes
air system from bleed air from the turbine
would any one want this ?

It would require a small pressure tap in the side of
your new turbine and could only keep up with a small
leek. But I think it would work no problem.
Every turbine flying now makes at least 30 psi at full
power. With large and small pistons and check valves
30 psi can make a small volume of 90 psi air..

Does any one think this is worth testing.. ?

Eddie Weeks
http://www.corpcomp.com/weeks1/

johnnyjet

My Feedback: (4)

Eddie your the man.

i bet it would save some one an aircraft.

keep up the good work

johnny

DIPSY

Have you got a pressure relief valve somewhere in the system so you regulate the pressure/don't blow up the tank? I was talking to a friend of mine in the US about this very subject last week, and we were saying its about time someone did this. It's about time someone put a small generator on these things to?

Woketman

My Feedback: (6)

Unless you have a sticky gear or a screwed up installation, would'nt 30 - 40 psid be enough to put down a set of 630 Robarts (especially if you help with some Gs)?

EddieWeeks

no..no. Rocketboy... This device has a large piston with
30 psi and its connected to a small piston with 3 times less
area. The trick will be to use the 30 psi with some kind of
valve to open and close to drive the big and small piston
back and forth... Stay with me now...

Can any one think of a good small way to open
and close these valves.. ?

Eddie Weeks
http://www.corpcomp.com/weeks1/

Woketman

My Feedback: (6)

I know what you are proposing, but to avoid the added complication of the valve switching and all, I was saying that for emergency use, perhaps the 30 to 40 psid that we already have is sufficient.

BMT

Eddie,
The switching valves you are looking for is the same as the gizmo found on top of a steam locomotives main drive piston... i.e. a changeover valve operated at the extreme of piston travel only.
Good luck

EddieWeeks

BMT... yea.. that's it

I was thinking to make it simple only compress
in one direction and use a spring to push it back.

But I think Rocketman is right, my 630 Robart gear
come down with 20 psi but the breaks don't work at all..

I don't know... sounds like a lot of work for something
that is not a big problem...

Vincent

My Feedback: (61)

Hi Eddie, your brain really works overtime doesn`t it!! How about finding a spot for a small air tank and keep it isolated from the system with a valve that can be activated via a TX function. This would give the system a shot to snap down the gear in the event it was dangling due to loss of air pressure. I agree though, its not a major problem in my mind. Using the onboard gauges has really cut down my air loss problems.

Vin...

Tom Antlfinger

My Feedback: (24)

Vin:

Paul Hopkins did exactly what you are asking about in the F-15 I got from him last year.

Quite a simple arrangement with a couple of T's and one-way valve controlled via a servo. You do need a channel to run it.

It uses Brake Tank Air, presuming. of course, that you have separate gear and air tanks.

Just rotate the knob on the tranny, and the gear blows down from Brake Air. That way, you don't have to cram in another tank.

Actually pretty slick, if you have a spare channel.

Paul, I'm sure, would be happy to give you the scoop on the hookup.

Tom

Chris Z

My Feedback: (24)

Eddie,
what is the temperature of the Bleed Air?

PJFaller

You are going to need some way of cooling the air. The air tap of the compressor section which is where i would assume you would get it tends to run hot. I fly a 767 and all the airplanes that ive flown that taps bleed air for pneumatics and pressurization, runs through a ram air turbine with a mix valve that regulates cold air for temperature to its using units. If that fails the bleed valve from the enigne slams closed and will not reopen until the air cools. also there is a high and low stage bleed air valve that regulates the pressure for all power settings, I dont know if you would need this as well. for example at high power settings, high stage valve close to keep from bursting a line, and at low power settings it opens to keep enough pressure in the system. Do you think we would need to worry about these things or not? If not great Idea and Im definately interested...GOOD LUCK........


Pete Faller

Chris Z

My Feedback: (24)

That was my point about the high temperatures. I think this is a high tech solution for a low tech problem. Vince's suggestion seems most logical.
Chris

747drvr

My Feedback: (5)

Sounds like a cool idea. The max case pressure in the MW54 size turbines is about 20 psi. Cooling of the bleed air is not going to be an issue with the very low pressure ratios involved. I know what Pete is talking about but a GE or PW turbofan has many compressor stages to compress the air and make the bleed air quite hot. Our turbines only have one rather modest compressor.