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Search: Posts Made By: Wizofoz
Showing results 1 to 35 of 61
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Forum: Tech Log
11th Aug 2018, 03:11
Replies: 330
Views: 50,668
Posted By Wizofoz

No fair!!!! Pprune towers has taken our...

No fair!!!!

Pprune towers has taken our chew-toy away!

Who are we going to point at and laugh now??
Forum: Tech Log
7th Aug 2018, 18:48
Replies: 330
Views: 50,668
Posted By Wizofoz

You use airspeeds and groundspeed in the same...

You use airspeeds and groundspeed in the same diagram-that is, vectors from different IRFs. The velocity of an aircraft doesn't "consist of" airspeed components and groundspeed components, it's...
Forum: Tech Log
7th Aug 2018, 18:45
Replies: 330
Views: 50,668
Posted By Wizofoz

Yes, "Galilleo's ship" is often sited, but Newton...

Yes, "Galilleo's ship" is often sited, but Newton expressed it best.

If you know this, how come you can't figure out it invalidates your claim?
Forum: Tech Log
7th Aug 2018, 18:43
Replies: 330
Views: 50,668
Posted By Wizofoz

So, the "discussion" doesn't seem to be going you...

So, the "discussion" doesn't seem to be going you way now, does it...….

Thank you for admitting the fact that in one IRF the air is still (actually, in an INFINATE number, but I digress),

So,...
Forum: Tech Log
7th Aug 2018, 12:55
Replies: 330
Views: 50,668
Posted By Wizofoz

Wizofoz thinks this because Newton proved it. ...

Wizofoz thinks this because Newton proved it.

Brercrow says this is not so, yet simultaneously says he understands Newton.

Explain to Brercrow his mistakes.
Forum: Tech Log
7th Aug 2018, 12:04
Replies: 330
Views: 50,668
Posted By Wizofoz

Thing is, we agree on the actual physics, this is...

Thing is, we agree on the actual physics, this is totally a matter of semantics- but it DOES lead to confusion when people don't understand the difference between a scalar and a vector quantity- it...
Forum: Tech Log
7th Aug 2018, 12:02
Replies: 330
Views: 50,668
Posted By Wizofoz

I understand they used the term "speed", but they...

I understand they used the term "speed", but they did so referencing a direction- that makes it a velocity.

Please answer my question regarding traveling at what you call a negative speed for a...
Forum: Tech Log
7th Aug 2018, 11:34
Replies: 330
Views: 50,668
Posted By Wizofoz

but the sign of the wind speed has changed with...

but the sign of the wind speed has changed with the reference velocity direction.

They are talking velocity, not speed.

Try it this way- if you drive your car in reverse at -30KPH for an hour,...
Forum: Tech Log
7th Aug 2018, 10:21
Replies: 330
Views: 50,668
Posted By Wizofoz

Just to be clear, whose drivel are you objecting...

Just to be clear, whose drivel are you objecting to?
Forum: Tech Log
7th Aug 2018, 04:37
Replies: 330
Views: 50,668
Posted By Wizofoz

I assume justifying your position that the way...

I assume justifying your position that the way you are facing defines "negative" speed.
Forum: Tech Log
7th Aug 2018, 02:35
Replies: 330
Views: 50,668
Posted By Wizofoz

I don't dispute the math- I dispute you are...

I don't dispute the math- I dispute you are making any pertinent point.
Forum: Tech Log
7th Aug 2018, 02:29
Replies: 330
Views: 50,668
Posted By Wizofoz

No, speed and velocity are completely different...

No, speed and velocity are completely different things and are useful; in different circumstances.- and if your whole argument has been that they are the same, you have been sadly mistaken.

Your...
Forum: Tech Log
7th Aug 2018, 02:20
Replies: 330
Views: 50,668
Posted By Wizofoz

We were talking about ground speed, not ground...

We were talking about ground speed, not ground velocity.
Forum: Tech Log
7th Aug 2018, 02:07
Replies: 330
Views: 50,668
Posted By Wizofoz

Thus, you have added direction to magnitude and...

Thus, you have added direction to magnitude and are talking velocity not speed.

The distance between two paces can't be negative thirty miles.
Forum: Tech Log
7th Aug 2018, 01:54
Replies: 330
Views: 50,668
Posted By Wizofoz

ET TU Wiki- ...

ET TU Wiki-

https://en.wikipedia.org/wiki/Speed

in everyday use and in kinematics (https://en.wikipedia.org/wiki/Kinematics), the speed of an object is the magnitude...
Forum: Tech Log
7th Aug 2018, 01:50
Replies: 330
Views: 50,668
Posted By Wizofoz

Well, the math is that drag is now more than...

Well, the math is that drag is now more than thrust, so it will cause acceleration in the "tailwards" direction.

This would be the same as flying at 100 kts, then quickly reducing throttle to the...
Forum: Tech Log
7th Aug 2018, 01:45
Replies: 330
Views: 50,668
Posted By Wizofoz

So, if you have a groundspeed of negative thirty...

So, if you have a groundspeed of negative thirty knots for an hour is your displacement negative thirty miles from your origin?
Forum: Tech Log
6th Aug 2018, 22:03
Replies: 330
Views: 50,668
Posted By Wizofoz

We are all on the same page, but just someth8ng...

We are all on the same page, but just someth8ng for the poitive_negative guys to mull- you are defining positive ground speed as being in the direction the aircaft is ponting- well, if there is any...
Forum: Tech Log
6th Aug 2018, 19:08
Replies: 330
Views: 50,668
Posted By Wizofoz

Point being, I would say his ground speed has...

Point being, I would say his ground speed has gone from 2kts to 7 knots. His ground velocity frim 2cknots North to 7 knots South (or whatever).
Forum: Tech Log
6th Aug 2018, 19:03
Replies: 330
Views: 50,668
Posted By Wizofoz

I understood what you meant, sure. lets say...

I understood what you meant, sure.

lets say he pedals throgh 90 degrees- now whats jis groundspeed?
Forum: Tech Log
6th Aug 2018, 18:52
Replies: 330
Views: 50,668
Posted By Wizofoz

Jetfan 7kts. I don't understand your...

Jetfan

7kts.

I don't understand your point.
Forum: Tech Log
6th Aug 2018, 18:25
Replies: 330
Views: 50,668
Posted By Wizofoz

Vesbot, Yes we are just talking semantics. ...

Vesbot,

Yes we are just talking semantics.

The magnitude of the ground velocity of the Cessna is 10 knots, its direction being 180 degrees to its heading.

Its position over the grond is...
Forum: Tech Log
6th Aug 2018, 18:04
Replies: 330
Views: 50,668
Posted By Wizofoz

How do you quote on an Android?? Vesbot, you...

How do you quote on an Android??

Vesbot, you didn't deal with the guy standung sideways- is his groundspeed positive or negative?
Forum: Tech Log
6th Aug 2018, 17:58
Replies: 330
Views: 50,668
Posted By Wizofoz

Well, velocity is in relation to a frame of...

Well, velocity is in relation to a frame of reference. If we are talking groundspeed, then relative to the ground.

The magnitude of velocity is the rate of change of position-m/s, km/hr, furlongs/...
Forum: Tech Log
6th Aug 2018, 17:41
Replies: 330
Views: 50,668
Posted By Wizofoz

Yes, but can you have a groundspeed which is...

Yes, but can you have a groundspeed which is neither poitive nor negative?

A good starting point would be a definition of speed- I always just assumed it was the magnitude of velocity. You seem to...
Forum: Tech Log
6th Aug 2018, 17:08
Replies: 330
Views: 50,668
Posted By Wizofoz

Thats the point-neither. so do you not HAVE...

Thats the point-neither.

so do you not HAVE a groundspeed?
Forum: Tech Log
6th Aug 2018, 16:56
Replies: 330
Views: 50,668
Posted By Wizofoz

Not in the frame where the air is still.

Not in the frame where the air is still.
Forum: Tech Log
6th Aug 2018, 16:52
Replies: 330
Views: 50,668
Posted By Wizofoz

It's still a pretty imprecise term. What would...

It's still a pretty imprecise term. What would your answer to the "sideways"case be?
Forum: Tech Log
6th Aug 2018, 16:46
Replies: 330
Views: 50,668
Posted By Wizofoz

So if two people are standing in the isle facing...

So if two people are standing in the isle facing each other, one is going positive and one negative? Does one therefore not get to the destination?

What is the ground speed of someone facing...
Forum: Tech Log
6th Aug 2018, 16:44
Replies: 330
Views: 50,668
Posted By Wizofoz

What does a negative ground speed look like?

What does a negative ground speed look like?
Forum: Tech Log
6th Aug 2018, 16:43
Replies: 330
Views: 50,668
Posted By Wizofoz

The magnitude of your ground VELOCITY is 30 MPH

The magnitude of your ground VELOCITY is 30 MPH
Forum: Tech Log
6th Aug 2018, 16:39
Replies: 330
Views: 50,668
Posted By Wizofoz

No-it doesn't matter which way you are facing, it...

No-it doesn't matter which way you are facing, it matters which way you have nominated as positive and negative in the reference frame you are using.

Acceleration is absolute- if his velocity...
Forum: Tech Log
6th Aug 2018, 11:49
Replies: 330
Views: 50,668
Posted By Wizofoz

Saying you understand something when everything...

Saying you understand something when everything you say shows you don't is not an affirmation.

Are all frames of reference equally valid?
Forum: Tech Log
6th Aug 2018, 11:11
Replies: 330
Views: 50,668
Posted By Wizofoz

OHHHH no you don't.

OHHHH no you don't.
Forum: Tech Log
4th Aug 2018, 08:43
Replies: 330
Views: 50,668
Posted By Wizofoz

Nor, apparently, did Isaac Newton.

Nor, apparently, did Isaac Newton.
Showing results 1 to 35 of 61
 
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