Larry , very nice work!! I would like to do something similar this winter with a Hyper-Viper wing. Not familiar with the t-nut you had mentioned for the pressure nipple or the Kirn-Kraft needle assembly. I have a tee dee .049 that i would like to use on this project. Any info on the t-nut and needle would be appreciated. Ray
Ray - maybe you call it a "blind nut". A t-nut is the standard motor-mounting blind nut. I think that
(judging from the picture), the outer diameter is ground down into a "lip" that the pressure tubing will
not slip off of and then the nut is just screwed right onto the plastic nipple.
A kirn-kraft needle assembly is a fine-thread (128 thread/inch) needle valve that replaces the Cox
needle, which is usually too course a thread when trying to run pressure. Don't know WHERE you might
still be able to get a Kirn-Kraft needle - Ace RC used to have a similar unit, also.