Just took a flight at 25,000 ft. from Sitka to Jackson Hole in a Royal Turbine Duke. Had ASE with REX textures, all cranked. No contrails from the Duke. Ai Aircraft under me had them, but not the Duke. I never really noticed it before as I am usually low and slow these days, like my bank account and my wits.Is this usual with the Duke, or might I have some setting screwed up?Kind regards,

Not sure how FSX models them, but contrails are based on available moisture in the air. So if you were flying in an inversion your altitude may have had less saturated air and therefore no contrails. Only explanation I can think of right off the top of my head.

Interesting. Dont remember if I have ever seen contrails from a turbine engine. RW or FS. Temp, humidity, EGT all effect contrail generation. Seems there is a min altitude that FS will generate contrails also.

Edited February 23, 201214 yr by Barnstormer1

Not sure how FSX models them, but contrails are based on available moisture in the air. So if you were flying in an inversion your altitude may have had less saturated air and therefore no contrails. Only explanation I can think of right off the top of my head.

Hi Paul,It was 40 some degrees below zero, above Alaska, with aircraft below me showing contrails. I just loaded and ran aicontrails.zip from the library that will add contrails to all aircraft, so it says. I had the program years ago but had forgotten about it or how well it works. Now I will see what happens. I will let everyone know.Kind regards,

I've never studied thermodynamics, but I'm pretty sure the exhaust gases from an engine such as the PT6 aren't enough to produce contrails.edit: I have seen wingtip vortices from all sorts of small planes on days with high relative humidity...

Edited February 23, 201214 yr by ryanbatcund

I've never studied thermodynamics, but I'm pretty sure the exhaust gases from an engine such as the PT6 aren't enough to produce contrails.edit: I have seen wingtip vortices from all sorts of small planes on days with high relative humidity...

Hi Ryan,Even piston engines leave contrails at altitude. The contrails over Europe during WW2 with B-17s and their fighter escorts were amazing. Here is a video of 2 P-51s flying with a jet.

http://www.youtube.com/watch?v=TFYzHfjTGtk&feature=related

Kind regards,

Thanks for the video...I wonder how those engines compare to modern day TP's such as the PT6? Would the exhaust be warmer?Well I guess I was wrong... here's a more powerful version of the PT6 on a king air 350... fairly weak contrails but contrails nonetheless(4th pic down)http://www.luchtzak....=43158&start=20edit again: can't tell if its a 350 or king air 200.... fwiw

Edited February 23, 201214 yr by ryanbatcund

Thanks for the video...I wonder how those engines compare to modern day TP's such as the PT6? Would the exhaust be warmer?

I don't know, :( but it would be the subject of a great discussion wouldn't it?

The contrails over Europe during WW2 with B-17s and their fighter escorts were amazing

Yes! And here they are! Part of an attack wave of 1,000 (one thousand!) B-17s:Cheers,- jahman.

A PT6 definitely can make contrails. As can any engine under the right conditions. Perhaps shoot RealAir an E-mail?

Here is a King Air 350 with contrails.

A C-130 Hercules

Kind regards,

You guys must have missed my edits.. no worries. Yeah Ive definitely seen C130's overhead from the tower... never smaller though.

You guys must have missed my edits.. no worries. Yeah Ive definitely seen C130's overhead from the tower... never smaller though.

Sorry Ryan, Never looked back up the thread!Just ran across this Airbus 380 Contrail video. It was shot from a KLM 747-400 cockpit. This is absolutely one of the most dramatic videos I have ever seen in aviation! I know it is off topic etc., but Holy Cow! :( Be sure to watch it in full screen in HD!

Kind regards,

Wow that A380 vid is impressive, hard to believe that is normal.

Wow that A380 vid is impressive, hard to believe that is normal.

That's neat..surfing anyone?