Recent content by stan

hi does anyone knows what exactly is a motor's nominal torque. for example, if i have a variable speed motor that runs from 0 to 3000rpm and its rated power is 3hp, then are there various nominal torque for different rpms? then which should i choose to if i need to connect it to a...

inverter motor hi i have a variable speed motor and i would like to control its speed electronically, does an ac control such as an inverter works? any idea how should i go about doing it? do i select my motor first then the controller comes later? wat specifications about the...

Hi i need a variable speed motor. I came across a catalog which has a motor with a base speed of 1800rpm and power of 1hp and it is of a variable torque type. What does base speed means here? Does it means it allows speed from 0 to 1800rpm? and does its power of 1hp is constant for...

Hi does anyone knows the standard answer for integral of cos(2deta)cos(ndeta) from 0 to 180 degress? for instance for integral of sin(ndeta)sin(deta) 0 to 180 degress, when n=1, it is 90 degress and when n not equals 1, it is 0... thanks

hi does anyone know the equation for a 3-dimensional stream function? for a 2 dimensional case, u=d(stream function)/dy and v=-d(stream function)/dx.. so does anyone knows how to express u, v and w in terms of the stream function for a 3-dimensional case... thanks. stan

Hi, i was wondering what is a eccentric counterbalanced drive mechanism, i could not find any pictures of this particular mechanism.. can anybody explain how it works and what is its purpose? stan

hi i need to model a gas turbine combustor and i was wondering which tool to use? is CFX or FEMLAB better? i would like the most straight forward step to achieve this task. Does FEMLAB needs programing to obtain the mesh, which program is more userfriendly? Btw,has anyone heard of the...

Hi all any ideas wat computational fluids dynamics is all about.. how should i go about using it, using codes? Wat kind of codes are used? Is it C programming or stuff like that? Thanks regards ss

hi all any idea why minor calibration is needed for torque wrenches? what causes the wrench to be out of range in the first place? stan

hi all does anyone knows when to use a micrometer torque wrench, a torque driver or a dial reading wrench? what r the applications of such wrenches? stan

hi fred sorry 4 the late reply bascially i need to construct something that shows how thrust could be demonstrated by serveral factors, such mass flow rate, speed ofair and so on something like holding a firehose and varying the hand pressure and varying the amt of thrust generated..but...

hi all, does anyone knows why the visciosity of air increases with temp while that of water decreases with temp? dont the higher temp causes the molecules to vibrate faster, thus allowinh more space to collide with each other, the visciosity should decreases.. thanks for any advice...

hi all, i need to construct a test rig to demostrate propulsion, the rig need sto be onstructed according to factors that affect thrust any ideas how to go abt doing it? stan

hi does anyone knows how a power screw works, illustrations would be helpful.. thanks ss

hi all, i did a dissambley of a torque driver, and when i put it back, i could not get teh click sound when i tried to calibrated the wrench.. any idea wat is wrong? regards, ss