DmitriKozlowsky Posted August 8, 2018 Share Posted August 8, 2018 PNB is one of the neatest and perilous features of AV-8B. On YT vids of HarrierII short rolling land, and I noticed that upon touch down, and nozzle to max above 90 , used as a speedbrake, there is short duration gout of flame from front nozzles. The hot nozzles are rear ones channeling engine exaust. Front nozzles are cold nozzles channeling bypass airflow from the giant fan, driven by engine. So there should not be any combustion gases in cold nozzles. So what causes that flame gout? Link to comment Share on other sites More sharing options...
defeatist99 Posted August 8, 2018 Share Posted August 8, 2018 PNB is one of the neatest and perilous features of AV-8B. On YT vids of HarrierII short rolling land, and I noticed that upon touch down, and nozzle to max above 90 , used as a speedbrake, there is short duration gout of flame from front nozzles. The hot nozzles are rear ones channeling engine exaust. Front nozzles are cold nozzles channeling bypass airflow from the giant fan, driven by engine. So there should not be any combustion gases in cold nozzles. So what causes that flame gout? If they were using max wet thrust I guess it's possible that EGR could ignite. I don't think you are supposed to use max thrust in reverse because of EGR. Couldn't say for sure though without seeing it. Link to comment Share on other sites More sharing options...
Nealius Posted August 10, 2018 Share Posted August 10, 2018 Compressor stall? Like defeatist99 said, PNB is supposed to be done at 70% RPM (IIRC), so nothing should be igniting. Link to comment Share on other sites More sharing options...
Fishbreath Posted August 13, 2018 Share Posted August 13, 2018 Reduced power makes sense—if you have the throttle set too high, the brakes don't work very well, because there's very little weight on the wheels. Black Shark, Harrier, and Hornet pilot Many Words - Serial Fiction | Ka-50 Employment Guide | Ka-50 Avionics Cheat Sheet | Multiplayer Shooting Range Mission Link to comment Share on other sites More sharing options...
DmitriKozlowsky Posted August 13, 2018 Author Share Posted August 13, 2018 JUst to be clear. I am describing a real world effect as seen on videos on YT. Not in the sim, which I have not experienced. In YT videos , aircraft is landing in wet conditions where a/c exaust is throwing around and up steam and water spray. Perhaps that is due to re-ingestion of steam and water spray. Link to comment Share on other sites More sharing options...
Recommended Posts