Thanks Jeff, good info. I should have said involved instead of designed. I assumed you had the most experience. So hard to imagine how this overweight happened.The Orion was/is slightly larger than the Raptor and about 10 % larger than the Velocity XL. The prototype with a twin turbo Cont. I0-550 weighed in at 2265 lbs empty and flew beautifully with better characteristics than the often cloned Rutan format.
Peter designed the PSRU. In CAD, so how could it not be perfect?Jeff Kerlo as Director of Engineering, Simple Question, Did he jump or was he pushed ????
And still can find no answer ref the design of the PRU, and who considered it a viable option,
somebody obviously sat down with pen and paper/cad and thought engine in rubber mounts and PRU rigid to the engine support, FFS.
Go back and rewatch him putting that thing together. 2 turbos and all the interconnecting pipe, intercoolers, fuel warmer heat exchanger, a/c, redrive, the mount.Only 325lbs, or 68%, over his predicted engine weight. Did he get a bargain pile of 4130 plate?
The static is upstream of the engine. Why he put a pitot-static out on the wing, but didn't plumb up the static is yet another curious feature.Someone on the POA forums pointed out that where PM thinks his airspeed and groundspeed are equalizing once airborne, it looks more closely like the airspeed comes down to closer to the groundspeed when the power is reduced. Probably indicated there is some vacuum caused by the engine that is affecting the static (i.e., making the static appear lower).
That’s my point. The engine/prop/PSRU may be pulling air from the location of the current static port. It’s not difficult to suck from upstream and get it to a lower pressure than ambient. Especially if he’s done a better job of preventing air into the location.The static is upstream of the engine. Why he put a pitot-static out on the wing, but didn't plumb up the static is yet another curious feature.
Maybe worth creating a small table - hp one variable (lets say 200,250,300,350,even 400) and best ROC speed the other variable (90/100/110)
Assuming we get a flight sometime soon we then then fill in some of the missing information quickly (what is the actual hp)