ORIGINAL: olnico

We have lots of 220s operating in the desert. Dusty, very hot and low pressure. Density altitude can be as high as 6000 ft with OAT typically around 100 to 115 F. The 220 performs as all the other Behotec/ BF engines in these conditions: extremely well.

Behotec have made a tour de force with this engine. First of all every unit is delivered with a thrust reading sheet that is coming from the pre-delivery engine test and made with a lab grade test bench. I have confronted my measurements with theirs and we are always within a few %. The test bench that I have been using for many years to do the RCJI engine tests is also lab grade and I calibrate it on a regular basis.

They managed to get that much thrust in a 160 form factor thanks to intensive CFD using one of the most famous software in that segment. The compressor, diffuser, NGV and turbine wheels have been very thoroughly digitally designed.
The thrust of 220N is achieved at a fairly low RPM of 123000 RPM. The engine is also running fairly cold at 750c TGT( not EGT as the tempreature reading is taken in front of the turbine wheel ).
Furthermore they have adopted a new very clever design for the fuel sticks that stabilizes the combustion cycle a lot and make them much more durable in time ( less hot spots on old engines ). The rear bearing also has several patents. It is self-centering and has a very specific cooling pattern that makes it run very cold.