I have a bobcat with a jetcat p-120 when I built it I drilled the mount incorrectly for the length of the turbine which caused me to angle the turbine down even more with washers under the front screws. I flew it that way for 4 years with no problems then I started to fly off grass and a cloth material it caused lots of problems burning the grass and cloth runway. I re-drilled the mount and it is now 0 degrees down and it made little or no difference in flying if anything it has a better vertical.