how come aero 152s don't hydrolock while inverted?

[taseal]

how come wet sump planes (like a aero 152) doesn't get hydrolocked by oil when it goes inverted? all that oil is now seeping into the pistons through the rings slowly...

just somethign I was thinking

when jeeps roll over, they hydrolock from the oil in the oil pan, so this made me think

[NJA_Capt]

Originally Posted by taseal

how come wet sump planes (like a aero 152) doesn't get hydrolocked by oil when it goes inverted? all that oil is now seeping into the pistons through the rings slowly...

when jeeps roll over, they hydrolock from the oil in the oil pan, so this made me think

Well, first off. When a Jeep is inverted, the pistons/cylinders are upside down. When an airplane is inverted, the cylinders are still horizontally opposed. I am pretty sure the Aerobat has an inverted fuel/oil system that permits such flight.

[taseal]

Originally Posted by NJA_Capt

Well, first off. When a Jeep is inverted, the pistons/cylinders are upside down. When an airplane is inverted, the cylinders are still horizontally opposed. I am pretty sure the Aerobat has an inverted fuel/oil system that permits such flight.

oh yah... totally forgot about most airplane piston engines being horizontally opposed.

now you know what I'm going to say....

'what about 90 degree banks?' lol

[Chris_Ford]

Originally Posted by taseal

oh yah... totally forgot about most airplane piston engines being horizontally opposed.

now you know what I'm going to say....

'what about 90 degree banks?' lol

I imagine you can't sustain them long enough for it to be a problem.

[taseal]

Originally Posted by Chris_Ford

I imagine you can't sustain them long enough for it to be a problem.

yeah true dat true dat

i know PITTS, 300 etc have dry sump (only logical way) but i dunno about wet sump engines

[USMCmech]

Don't forget, the airplane is right side up if there is positive G, regardless what the picture out of the window looks like.

You can do positive G manuvers with ANY engine all day long, as long as you don't unload, the airplane dosen't know the difference. The weight vector will always be out of the belly.

[Berkut]

In addition to what's been stated above, you don't leave your Jeep running when it's on its back. Once the engine has stopped, the oil pools on the undersides of the pistons and then starts to seep past the rings into the cylinder.

Even if your aircraft was positioned in such a way that oil would flow towards the inverted cylinders, you won't get enough seeping past the rings to hydraulic lock a running engine. Take a radial engine, for example. It's not uncommon for the lower cylinders on a radial engine to hydraulic lock after sitting for a while, but you don't see it happening in flight.

[taseal]

Originally Posted by Berkut

In addition to what's been stated above, you don't leave your Jeep running when it's on its back. Once the engine has stopped, the oil pools on the undersides of the pistons and then starts to seep past the rings into the cylinder.

Even if your aircraft was positioned in such a way that oil would flow towards the inverted cylinders, you won't get enough seeping past the rings to hydraulic lock a running engine. Take a radial engine, for example. It's not uncommon for the lower cylinders on a radial engine to hydraulic lock after sitting for a while, but you don't see it happening in flight.

another good point

thanks guys!

[OldTownPilot]

Originally Posted by USMCmech

Don't forget, the airplane is right side up if there is positive G, regardless what the picture out of the window looks like.

You can do positive G manuvers with ANY engine all day long, as long as you don't unload, the airplane dosen't know the difference. The weight vector will always be out of the belly.

Weight always points down, the weight being mass*gravity. The radial (centripetal) acceleration will point inward from the plane to the center of the circle. Centrifugal force opposes this force and points outward. if you sum the centrifugal force and the weight, that will point out the belly in a coordinated turn.