hI Art, thanx for the info.
I concur wrt the outlet size.
I just ran the setup with the 85mm tube now, I bought a digital fish pull scale and it also showed 1,8 kg of static (3.9 lB)
I will now remake the tube to be a 95mm exit and test again without the splitter plate, I want somthing to compare with when I put the plate in.
If I can get 10 Lb static I will be happy to try fly it. maybe the forward motion will add a pound or so of thrust.

Stay tuned :-)

Theuns