Brain Teaser (= Competition without prize)

[skippy]

Following on from Benny's effort to frustrate a few of you, here's my little effort to do the same. There's no prize giveaway. I'm just trying to give you something to think about. Hopefully you can see the two hydraulic cylinders below. The one on the left which I'll call (A) has a a 3" bore x 6" stroke and a 0.5" rod. Both cylinders are connected to identical pumps and then I apply X pressure and Y flow to the bottom port of the cylinder (the top port flows back to the reservoir). To lift the 50lb weight (on top) from bottom of piston travel to top of piston travel it takes 10 seconds. Now the piston on the right (B) is exactly the same cylinder and conditions except I take out my drill and drill a hole in the piston (hole is same size as inner port diameter) and I plug the top port. What will be the effect? What will happen? Please only give an answer without explaining why as this would ruin the quiz. (I guess I'm just another one with too much time on my hands!) We'll give this FIVE days ok?
Good luck!

Skippy
If there are problems to view the dxf file maybe someone could repost it as something more easily viewed.

Hmmm.... I can't see the file. Too big? I've read the FAQ's re posting a picture and can't see what I'm doing wrong.

[pmurray]

Neglecting buoyancy forces on the piston, which I assume are negligible, the piston on the right should remain at rest.

plm

[strat]

i'm stupid when it comes to this kinda stuff but wouldn't it depend on the structure of the fluid??????

[miljnor]

Originally Posted by pmurray Neglecting buoyancy forces on the piston, which I assume are negligible, the piston on the right should remain at rest. plm

Ditto! spot on

[cp8071]

editted to remove hints ... sorry

Hint: Single-ended verse Double-ended

CP

[skippy]

Please, please, no more "why's" or "because's" (and "hints" otherwise we be wrapped up in less than 24 hrs. Not even "what would be required", JUST what's going to happen. Don't even tell us how (by what calculations) you arrived at that answer, JUST the answer.

Secondly, we'll say that all the frictional forces, hydraulic fluids are the same therefore we can forget about them. While we're at it we'll also forget about pressure relief valves, control valves and all the rest to keep it simple.

Thirdly, we'll forget about the pressure and just say that the hydraulic pump driving this thing has the same flow rate (gpm) for both cylinders.

The answer may have already been given above but I'm not going to say. At the end of the five days the person who was first to give the correct answer wins.

Skippy

p.s. I've already got quiz number two ready and it's nothing to do with hydraulics. It's about travelling as a passenger in a jet.

[pmurray]

skippy,

"Thirdly, we'll forget about the pressure and just say that the hydraulic pump driving this thing has the same flow rate (gpm) for both cylinders."

Your getting close to giving it away.

plm

[skippy]

pmurray oops! Ssshhhh! I'll say no more.

Skippy

[cp8071]

The piston on the right (B) will take 0.28 seconds to reach full travel.

CP

[GARG69]

based on your dwg and setup nothing will happen to the cylinder on the right, flow will go thru to ?

[GARG69]

it will extend. i missed the closed head end

[ynneb]

Drawing B will remain static. ( Pity we are not allowed explain our reasonings though. )

Phil I added a picture into your post.