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Search: Posts Made By: Jet_Fan
Showing results 1 to 35 of 54
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Forum: Tech Log
7th Aug 2018, 19:44
Replies: 330
Views: 50,667
Posted By Jet_Fan

I never expected the guy to turn up. I just...

I never expected the guy to turn up. I just imagined we'd all agree the theory was rubbish. I obviously never expected others to rally to his cause.

His not exactly 100% behind his own theory...
Forum: Tech Log
7th Aug 2018, 18:57
Replies: 330
Views: 50,667
Posted By Jet_Fan

Actually, I think your theory is a turd, a...

Actually, I think your theory is a turd, a stinking one.
Forum: Tech Log
7th Aug 2018, 13:30
Replies: 330
Views: 50,667
Posted By Jet_Fan

Brercrow's thinking is just hopelessly flawed....

Brercrow's thinking is just hopelessly flawed. He's like a flat earth believer. He's a tragic figure.
Forum: Tech Log
7th Aug 2018, 11:56
Replies: 330
Views: 50,667
Posted By Jet_Fan

NASA are very clear in their example 'the wind...

NASA are very clear in their example 'the wind speed is -20 mph' in reference to the plane. A high enough positive sign wind can produce a negative sign GS in reference to a plane. There is no...
Forum: Tech Log
7th Aug 2018, 11:12
Replies: 330
Views: 50,667
Posted By Jet_Fan

According to NASA:...

According to NASA: https://www.grc.nasa.gov/www/k-12/airplane/move2.html



and:




​​​​​​​
Forum: Tech Log
6th Aug 2018, 22:33
Replies: 330
Views: 50,667
Posted By Jet_Fan

GS isn’t calculated as the absolute value of...

GS isn’t calculated as the absolute value of airspeed - headwind. If you think it is then you should edit that wiki page accordingly.
Forum: Tech Log
6th Aug 2018, 22:27
Replies: 330
Views: 50,667
Posted By Jet_Fan

How long is a bit of string?

How long is a bit of string?
Forum: Tech Log
6th Aug 2018, 22:24
Replies: 330
Views: 50,667
Posted By Jet_Fan

The idea that GS can’t fall into a negative value...

The idea that GS can’t fall into a negative value is really quite stupid. No need to report GS as mainly positive as its regarded as positive unless stated otherwise.
Forum: Tech Log
6th Aug 2018, 21:23
Replies: 330
Views: 50,667
Posted By Jet_Fan

Said what for you?

Said what for you?
Forum: Tech Log
6th Aug 2018, 20:56
Replies: 330
Views: 50,667
Posted By Jet_Fan

This might help some in here: ...

This might help some in here:

https://www.youtube.com/watch?v=u99LjJ32qOo
Forum: Tech Log
6th Aug 2018, 20:36
Replies: 330
Views: 50,667
Posted By Jet_Fan

As you love wiki so much, let's see what it has...

As you love wiki so much, let's see what it has to say about groundspeed:



What is 50 - 60?
Forum: Tech Log
6th Aug 2018, 20:12
Replies: 330
Views: 50,667
Posted By Jet_Fan

If you walk down to the tail of an airliner your...

If you walk down to the tail of an airliner your 'track is [now] the reciprocal of the [your] heading' though. ;)
Forum: Tech Log
6th Aug 2018, 19:47
Replies: 330
Views: 50,667
Posted By Jet_Fan

...is just another way of saying its GS has...

...is just another way of saying its GS has become negative.
Forum: Tech Log
6th Aug 2018, 19:19
Replies: 330
Views: 50,667
Posted By Jet_Fan

A cessna flying into a 60kt headwind at 50kts,...

A cessna flying into a 60kt headwind at 50kts, what's its GS?
Forum: Tech Log
6th Aug 2018, 18:58
Replies: 330
Views: 50,667
Posted By Jet_Fan

It's flipped around and gone from -2kts...

It's flipped around and gone from -2kts groundspeed to +7kts GS. Or are you saying GS is never negative in relation to the motion of an aircraft?
Forum: Tech Log
6th Aug 2018, 18:10
Replies: 330
Views: 50,667
Posted By Jet_Fan

Right, helicopter flying into a headwind such...

Right, helicopter flying into a headwind such that it has a groundspeed of -2kts but at the same time an airspeed of 5kts . Pilot of helicopter uses yaw pedal to change heading by 180. What's the...
Forum: Tech Log
6th Aug 2018, 17:53
Replies: 330
Views: 50,667
Posted By Jet_Fan

Yes, good one. :)

Yes, good one. :)
Forum: Tech Log
6th Aug 2018, 17:45
Replies: 330
Views: 50,667
Posted By Jet_Fan

Speed in relation to what?

Speed in relation to what?
Forum: Tech Log
6th Aug 2018, 17:14
Replies: 330
Views: 50,667
Posted By Jet_Fan

The groundspeed is still there, it didn't go...

The groundspeed is still there, it didn't go anywhere. A chopper can have a - groundspeed and a + airspeed at the same time, while a ball just has groundspeed.
Forum: Tech Log
6th Aug 2018, 16:56
Replies: 330
Views: 50,667
Posted By Jet_Fan

If you move sideways, are you moving forwards or...

If you move sideways, are you moving forwards or backwards?
Forum: Tech Log
6th Aug 2018, 16:55
Replies: 330
Views: 50,667
Posted By Jet_Fan

Yep No, they both get to the destination,...

Yep

No, they both get to the destination, unless one it on the wrong flight.

Same as a ball that's facing sideways.

Next question.
Forum: Tech Log
6th Aug 2018, 16:48
Replies: 330
Views: 50,667
Posted By Jet_Fan

Land a parachute with a negative groundspeed and...

Land a parachute with a negative groundspeed and have someone video you. Whether groundspeed it + or - does matter sometimes.
Forum: Tech Log
6th Aug 2018, 16:41
Replies: 330
Views: 50,667
Posted By Jet_Fan

We are looking at is groundspeed not his...

We are looking at is groundspeed not his velocity. His groundspeed can be + or -.
Forum: Tech Log
6th Aug 2018, 16:02
Replies: 330
Views: 50,667
Posted By Jet_Fan

It's not even a mistake, let alone the same...

It's not even a mistake, let alone the same mistake. The whole point is to explain to people like Ian, that what he saw was different to what the plane actually experienced.

Now, a ball can't...
Forum: Tech Log
6th Aug 2018, 15:26
Replies: 330
Views: 50,667
Posted By Jet_Fan

That's his speed relative to the airframe. When I...

That's his speed relative to the airframe. When I move backwards relative to the ground, my groundspeed has a minus in front of it.
Forum: Tech Log
6th Aug 2018, 15:23
Replies: 330
Views: 50,667
Posted By Jet_Fan

He is moving backwards. If I reverse my car at...

He is moving backwards. If I reverse my car at 30mph, what is my car's groundspeed? Clue: the speedo won't be reading 30mph.
Forum: Tech Log
6th Aug 2018, 15:08
Replies: 330
Views: 50,667
Posted By Jet_Fan

It is simply HIS groundspeed measured from his...

It is simply HIS groundspeed measured from his frame of reference.
Forum: Tech Log
6th Aug 2018, 15:03
Replies: 330
Views: 50,667
Posted By Jet_Fan

Why do you think?

Why do you think?
Forum: Tech Log
6th Aug 2018, 14:55
Replies: 330
Views: 50,667
Posted By Jet_Fan

no, it's -499 because he is facing the tail. If...

no, it's -499 because he is facing the tail. If he stops it goes back to -500. If he turns to face the cockpit while stationary it goes from -500 to +500 almost instantly.
Forum: Tech Log
6th Aug 2018, 14:48
Replies: 330
Views: 50,667
Posted By Jet_Fan

A steady wind has no aerodynamic effect on the...

A steady wind has no aerodynamic effect on the aircraft.

Ask any physicist.
Forum: Tech Log
6th Aug 2018, 14:44
Replies: 330
Views: 50,667
Posted By Jet_Fan

Yeah, but he is choosing to go from 60kts (the...

Yeah, but he is choosing to go from 60kts (the airspeed) to 120kts downwing (the groundspeed) and claiming it's a much bigger change just because of the wind.
Forum: Tech Log
6th Aug 2018, 14:17
Replies: 330
Views: 50,667
Posted By Jet_Fan

All you're doing there is mixing frames of...

All you're doing there is mixing frames of reference to get the answer YOU want, not an intelligent way to proceed.
Forum: Tech Log
4th Aug 2018, 14:48
Replies: 330
Views: 50,667
Posted By Jet_Fan

The Downwind Turd There, that sounds better.

The Downwind Turd

There, that sounds better.
Forum: Tech Log
2nd Aug 2018, 21:32
Replies: 330
Views: 50,667
Posted By Jet_Fan

I meant to type ‘further’ rather than ‘rather’.

I meant to type ‘further’ rather than ‘rather’.
Forum: Tech Log
2nd Aug 2018, 20:03
Replies: 330
Views: 50,667
Posted By Jet_Fan

I think this rather exposes the fact that he...

I think this rather exposes the fact that he really doesn’t understand the basics of aerodynamics. He talks about drift angle, which is obviously only in reference to the ground and then claims it’s...
Showing results 1 to 35 of 54
 
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