Recent content by scotty c

an impulse drive after complete engine failure. no, just messing with you. i have an old vw bug which is of course air cooled. at some rpm point the fan in the bug will be able to draw air in so fast that the suction will exceed the ability of the atmosphere to replenish the flow. the input for...

this should be easy. suppose i have a very large spaceship holding a tremendous volume of air at 14.7psi with a density of .0023769 slug/ft^3. i put a hole in the side of my spaceship that is 6" in diameter which vents to the vacuum of outer space. what is the velocity of the escaping air? i did...

we are on the same page but I'm on the front and you're on the back. link to photo of the vw type 1 fan http://www.justkampers.com/113-119-031-b-doghouse-fan-vw-beetle-1970-on-vw-t2-bay-1600cc-1970-1979.html 2 links to the fan in action. link to my personal motor running (more or less) link to...

sorry, forgot to answer this. in the case of the vacuum. let's see. the motor is set up to run at a particular power. the fan speeds up until that power is still being utilized. so fan load remains the same. this vacuum plugged analogy just isn't right though. the vw fan isn't going to speed up...

after doing some more research, here's what I've found. the blocked flow power depends on the shape, number and angle of the blades (not speed). do the calcs and then throw it out the window because the only way to know for sure is to experiment. so much for a "reasonable analytical answer". i...

ok, the flow stops. the fan speed increases. the fan speed reaches equilibrium. the air in the vicinity of the fan starts to get really really hot and then plastic fan and the plastic housing melt all because the fan is still sucking up power.

the vw type 1 engine comes with flaps that close when the engine is cold. i know the flow through the fan doesn't completely stop but for the sake off argument let's assume that is does. the fan is spinning but there is no flow. what power is required to maintain the pressure differential...