radiators have no influence on speed

[MadBlaster]

So I suppose the jet stream means nothing to you. No effect on TAS what so ever.

[IvanK]

Err I ride jetstreams for a living they don't affect TAS just the Groundspeed.

Whether I am in the jetstream or not the Mach number and or IAS and the TAS are the same, the Groundspeed changes though. If i was in the centre of a jetsream and performed a 180degree turn all that changes is groundspeed, IAS/TAS and Mach number remain the same.

Have a look here :

http://en.wikipedia.org/wiki/True_airspeed

and here:

http://en.wikipedia.org/wiki/Ground_speed

[Tiger27]

Originally Posted by IvanK

Err I ride jetstreams for a living they don't affect TAS just the Groundspeed.

Whether I am in the jetstream or not the Mach number and or IAS and the TAS are the same, the Groundspeed changes though.

Having known and flown (only in games unfortunately)Ivan for a few years, I would just say, take his advise on this, he is a real commercial and ex military pilot, also if you give it some thought, it is pretty obvious that what Ivan is saying is true, it affects ground speed but not airspeed, in other words your not actually travelling as far, but you are still going at the same speed.

[MadBlaster]

Okay, I think I understand now what you are saying. I am not a pilot btw.

But isn't ground speed and IAS and TAS at sea level pretty close to being the same for this purpose?

Edit:except for the wind vector component I guess??

Edit2: okay i think I get it after wiki. moving air mass...whatever blah, blah. no need to worry about wind in test then.