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Showing results 1 to 25 of 294
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Search: Posts Made By: MikeB
Forum: Physical Sciences 05-22-2016, 01:15 PM
Replies: 438
Views: 9,422
Posted By MikeB
Are you daft? Everyone can "see" that it is...

Are you daft? Everyone can "see" that it is possible, as can you, as we have all seen the clear videos where the BB did not just slightly exceed windspeed, it massacred it. Richard Jenkins videoed...
Forum: Physical Sciences 05-21-2016, 07:32 PM
Replies: 438
Views: 9,422
Posted By MikeB
Are you daft? Everyone can "see" that it is...

Are you daft? Everyone can "see" that it is possible, as can you, as we have all seen the clear videos where the BB did not just slightly exceed windspeed, it massacred it. Richard Jenkins videoed...
Forum: Physical Sciences 05-21-2016, 04:14 PM
Replies: 438
Views: 9,422
Posted By MikeB
I doubt Heinz can sort this out so I will do it. ...

I doubt Heinz can sort this out so I will do it. The answer in both cases is zero.

In both cases the engine inputs energy to the plane at a rate of 100,000 W. However, with the plane at constant...
Forum: Physical Sciences 05-18-2016, 08:43 PM
Replies: 438
Views: 9,422
Posted By MikeB
This is a nonsense, non-technical statement. Any...

This is a nonsense, non-technical statement. Any real wheel, "perfectly round", will deform from round under an asymmetric loading such as pressure from a belt on part of the circumference and axle...
Forum: Physical Sciences 05-18-2016, 04:47 AM
Replies: 438
Views: 9,422
Posted By MikeB
At least I have a Spork model cart! How much...

At least I have a Spork model cart! How much will they be worth in the future?
Forum: Physical Sciences 05-16-2016, 10:13 PM
Replies: 438
Views: 9,422
Posted By MikeB
Wait, seriously?[/QUOTE] Hahaha Ben, you...

Wait, seriously?[/QUOTE]

Hahaha Ben, you were trolled by RP!
Forum: Physical Sciences 05-15-2016, 12:37 AM
Replies: 438
Views: 9,422
Posted By MikeB
At least it'll approach wind speed in the...

At least it'll approach wind speed in the asymptotic, infinitesimal sense. :)
Forum: Physical Sciences 05-14-2016, 07:36 PM
Replies: 438
Views: 9,422
Posted By MikeB
Greetings Rick! For name-calling we have had a...

Greetings Rick! For name-calling we have had a few doozies come through, fortunately not to stay. Like this guy who wasted no time with a friendly reply:
...
Forum: Mathematics 05-14-2016, 03:34 AM
Replies: 23
Views: 3,258
Posted By MikeB
This is a bit different from the solution path I...

This is a bit different from the solution path I was taught. I'm used to solving for one variable in terms of the other in one equation and substituting into the other equation.

So a + 2b = 4...
Forum: Physical Sciences 05-14-2016, 02:48 AM
Replies: 438
Views: 9,422
Posted By MikeB
Heinz loses to clarity

What I couldn't get my head round was how the energy was being transferred from the wind and how the prop was getting energy from the air and still working as a prop. Once I pictured it as getting a...
Forum: Physical Sciences 05-11-2016, 01:07 AM
Replies: 438
Views: 9,422
Posted By MikeB
But they are always slower than wind speed! Ask...

But they are always slower than wind speed!
Ask Humber....:D[/QUOTE]

Aren't they, if they start out slower than wind speed?? I can't remember the word that describes this, but I recall reading...
Forum: Physical Sciences 05-10-2016, 01:58 AM
Replies: 438
Views: 9,422
Posted By MikeB
We explain why Heinz thinks and says what he...

We explain why Heinz thinks and says what he does? Heh. If he truly thinks and believes what he says, he is not bright in the face of evidence and may have a mental issue where he has chosen a...
Forum: Physical Sciences 05-09-2016, 10:45 PM
Replies: 438
Views: 9,422
Posted By MikeB
Here's one of your points I keep getting stuck...

Here's one of your points I keep getting stuck on, Grins. Just wasted a half hour looking on YT for some videos posted a few years back about 2 different students who made a TM carts. Both really...
Forum: Physical Sciences 05-08-2016, 08:30 PM
Replies: 438
Views: 9,422
Posted By MikeB
My god, this is comedy gold. Over and over we...

My god, this is comedy gold. Over and over we explain how the cart works in reacting against both the ground and the air, which have some velocity with respect to one another, perhaps we may call it...
Forum: Physical Sciences 05-08-2016, 08:18 PM
Replies: 438
Views: 9,422
Posted By MikeB
And "static" thrust is just a convenient name. ...

And "static" thrust is just a convenient name. The thrust of a propeller in free air, not moving with respect to the propeller, could be called anything, such as "initial" thrust. When an airplane...
Forum: Physical Sciences 05-07-2016, 02:38 PM
Replies: 1,202
Views: 18,643
Posted By MikeB
And "static" thrust is just a convenient name. ...

And "static" thrust is just a convenient name. The thrust of a propeller in free air, not moving with respect to the propeller, could be called anything, such as "initial" thrust. When an airplane...
Forum: Physical Sciences 05-07-2016, 02:33 PM
Replies: 1,202
Views: 18,643
Posted By MikeB
Wrong, I have several times in this thread, last...

Wrong, I have several times in this thread, last year and this year, given specific numbers and math. I gave the example of a cart a specific ground speed (10 feet per second) with a specific drag...
Forum: Physical Sciences 05-06-2016, 10:00 PM
Replies: 1,202
Views: 18,643
Posted By MikeB
Heinz, this has been patiently explained numerous...

Heinz, this has been patiently explained numerous times. You are partly right.
"The wheels are moving on the ground and are generating power based on that movement with respect to the ground, not...
Forum: Physical Sciences 04-29-2016, 05:07 PM
Replies: 1,202
Views: 18,643
Posted By MikeB
Then how would you explain that the treadmill...

Then how would you explain that the treadmill cart, when the propeller is removed, just rolls back off of the treadmill? And when the propeller is put back on the propshaft, the cart pushes forward...
Forum: Physical Sciences 04-27-2016, 01:30 AM
Replies: 1,202
Views: 18,643
Posted By MikeB
Yes (assuming it's not slipping). The...

Yes (assuming it's not slipping).



The linear velocity of the wheel at the contact point vb is

vb = v - w r,

where v is the linear velocity of the center of the wheel, r is the radius,...
Forum: Physical Sciences 04-27-2016, 01:22 AM
Replies: 1,202
Views: 18,643
Posted By MikeB
Well, I'm out now and back tomorrow. No doubt the...

Well, I'm out now and back tomorrow. No doubt the subject will come up over dinner and I'm taking my favourite cotton reel. Perhaps Heinz will speak for himself.[/QUOTE]

Ask them to show you a...
Forum: Physical Sciences 04-19-2016, 03:09 AM
Replies: 1,202
Views: 18,643
Posted By MikeB
Not to mention this...

Downwind Faster than the Wind (DWFTTW) Myth Challenge - YouTube
Forum: Physical Sciences 04-19-2016, 02:56 AM
Replies: 1,202
Views: 18,643
Posted By MikeB
Right. What the heck is this? DDW.mov -...

Right. What the heck is this?

DDW.mov - YouTube
Forum: Physical Sciences 04-17-2016, 07:16 PM
Replies: 1,202
Views: 18,643
Posted By MikeB
You shouldn't take yourself so seriously then....

You shouldn't take yourself so seriously then. Nobody else does.

How about the diagram^^^^^^^[/QUOTE]

Nothing wrong with the diagram with the forces as you have chosen to depict them. But it...
Forum: Physical Sciences 04-16-2016, 11:37 PM
Replies: 1,202
Views: 18,643
Posted By MikeB
"Power is transferred from the wheels to the...

"Power is transferred from the wheels to the propellor"? Where do the wheels get their power from? Take power off the wheels by driving the propellor and the wheels are braked. The vehicle is...
Showing results 1 to 25 of 294

 
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