Hi Pioneer,
I did reconsider to build an PAF x400 for impeller, but the 16/15/3 version crashed.
http://www.rcgroups.com/forums/showthread.php?t=558138
I think this was because of stalling at high speed (tough the pusher setup is by far not as fast as the RBC delta400 I have which shows pushers have bad efficiency.
Rebuilding the Uriah for 60mm gives several problems. with VM400/2w20/4s2200mAh35C it flys already 300kmh on ca 550W thrusttube diameter 47mm now!). with more power the plane is likely to flutter or break apart when cornering.
The concept is very good but if I build a new version it should be able to cope with 1200+watts, have better intake design and better load distribution on the wing.Right now alll the G-load is on the wing root. The stab needs to be flutter proof as well which is Jepe Piranha style which could flutter. Rudders may have need to have 2 servos each rudder as well to prevent flutter.
With 1200+W I think it will be much faster as 300kmh.With mini60 it will have more efflux which is a problem.
Because of these problems I never published the drawings to prevent accidents.
Right now I am redesigning the Boulton P111 for mini60/900-1200W. The build should be much easier as the Dittmar plan. I have no time to build it right now but it should be a very nice project. I'll restart my thread soon.Perhaps other builders like to build one for them selves
Perhaps i need some help as well.