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Power-User

Join Date: Jul 2009
Posts: 124

Math Problem

08/07/2009 4:54 PM

If you have a 1"x2" exhaust tube blowing air out of it at a rate of 250Mph 440cubic ft per minute what would the foce or torque be if directed at a finned 35 lb fly wheel also can the torque of a wheel thats not connected to the drive train 22' wheel at lets say 45 mph of course coonected to the pavement but just free spinning like a trailer wheel I hope this is enough info thank you in advance for any reply

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Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: math i cant do

08/07/2009 11:46 PM

And what would be the source of this," 250Mph 440cubic ft per minute" wind?

Back to square one for you!

"also can the torque of a wheel thats not connected to the drive train 22' wheel at lets say 45 mph of course coonected to the pavement but just free spinning like a trailer wheel"

Now, you're on to something!!!

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Power-User

Join Date: Jul 2009
Posts: 124
#2
In reply to #1

Re: math i cant do

08/08/2009 9:07 AM

the source is a leaf blower haha may sound crazy its a project im working on to see if there is any other useful purpose for that 250 mph wind coming off that leaf blower it seems to pack a pretty good punch at close range working with very little means have five children and limited knowledge lol do not have the math knowledge to answer my own ? or tools to measure the torgue i believe the toque will play the largest roll in my experiment. as for the car wheel electric cars are charging during breaking and coasting i bei=lieve there missing something another source of energy that could raise its efficiancy. again any help would be surely appreciated

an open mind need not think outside the box it has no boundries

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Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#3
In reply to #2

Re: math i cant do

08/08/2009 2:24 PM

The energy required to run the leaf blower far outweighs any output you might get.

Not to mention the cost of the parts to produce your wind generator.

This concept is outrageously inefficient and ill informed.

Sorry.

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Anonymous Poster
#4

Re: Math Problem

09/27/2009 3:48 AM

OK, if you want to have math problems give math problems that need time and some high mathematics. Here is no math needed, just simple Physics and you have to match just the numbers corcectly cause there just needed many problems from simple physics.

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Power-User

Join Date: May 2011
Location: Chennai, TAMIL NADU, INDIA
Posts: 108
Good Answers: 1
#5

Re: Math Problem

09/01/2011 11:05 AM

Dear Johnnyb5,

Your posting contains 2 parts and What I understand from your posting is:

One Part is that THE ESCAPE OF AIR at an exit Velocity of 250 Miles per Hour and 440 Cubic.Feet/Minute. Is that right.?

If so pl. clarify the following:

1. What is the Temperature of the Air blowing out. This is required to calculate the weight of the air blowing out/Sec.

2. Then Mass x Velocity = Thrust, similar to JET AIR CRAFT ENGINES.

3. Once you calculate the weight/sec. and you know the velocity/sec you can calculate the Thrust. Be sure to use correct Units. The speed of Air is given as 250 MPH is equal to 366.66 Ft/sec OR 111.7 M/sec. and Volume is given as 440 Cubic.Feet/Minute and is equal to 7.333 Cubic.Feet/Sec. OR 0.34 M/Sec.

4. Now you have to tell us the Density or Temperature so as to apply Temperature Correction.

The second part of your posting given by you reads as

"if directed at a finned 35 lb fly wheel also can the torque of a wheel thats not connected to the drive train 22' wheel at lets say 45 mph of course connected to the pavement but just free spinning like a trailer wheel"

This portion - I do not understand. Pl.clarify.

RAJESWARI.

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Power-User

Join Date: Jul 2009
Posts: 124
#6
In reply to #5

Re: Math Problem

11/08/2011 10:24 PM

i have started a nother discussion on 250 mile per wind i would like your input estimated temp of air is 120 degrees

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Power-User

Join Date: Jul 2009
Posts: 124
#7
In reply to #5

Re: Math Problem

11/10/2011 9:02 PM

Thank you for your interest the temperature is 120 degrees Fahrenheit.

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Anonymous Poster (1); johnnyb5 (3); lyn (2); rajeswari (1)

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