Anyone working on a harrier?
Hi Pegasus
Very impressive looking fan. From what I can see there are around 30 blades slotted into an alloy hub. Have you used carbon fiber for the blades?. I take it it is a single stage fan as opposed to the rolls Royce Pegasus 3 stage LP fan?.
I would be interested to know what diameter your LP shaft is, and the general clearance you are running through the HP shaft?. This has been the head ache with our fan engine, as the core is based on the MW54, which only has a 6mm diameter compressor bore. We have enlarged that to 8mm, and taken a stress factor into account for the compressor, to allow more running clearance between the two shafts. Our fan has a 4 : 1 planetary gear reduction in the hub, due to the LP turbine running at 55000rpm, so the fan runs at 12000 rpm and is 180 mm diameter. The core engine runs at 160000 rpm, and both shafts run in the same direction. the fan rotates in the opposite direction due to the gearbox. We haven't run the engine at full power yet, but have gone to about 80% and are producing around 20 lb of thrust, full power we predict about 25, to 27 lb
What are you planning for the hot gas ducting, and nozzle's for the harrier, I should think that fabricating that little lot up will be challenging, allowing for expansion/sealing of the variable rear nozzles!!.
All very good stuff
Happy new year
Guy