hansking12
Senior Heliman
Location: irvine, ca
| super redundant system for torque tube already in effectalthough it feel badly that droid's heli had misfortune, this is the first time i've heard of a torque tube slipping in that fashion on a synergy. i don't think this in itself warrants a change in design since the whole thing has been used/abused under stringent circumstances. the system in place is already redundant seeing as there are 4 setscrews where only 1 is needed in a perfect world. unfortunately, if all 4 come loose, these things can happen. i would be interested to see a picture of the torque tube itself without the collar to try and determine whether the setscrews even engaged it significantly. there would be marks and deformation since the tube is alum and the screw is steel. . .
also, reversing the collar would only be useful if the fit was better/tighter where the set screws engaged--in droids case, since there was significant wear where they normally go in, reversing the collar would appear to be the better choice.
i flew the synergy again this morning after yesterday's exam and hammered the tail in both directions repeatedly and checked for slippage before/after the flight. there is minimal lash in the tail rotor system in a properly functioning n9 system, and the telltale sign that something is amiss is either slippage when turning the tail rotor while holding the main rotor or an increased amount of lash in the tail system. the increase in lash becomes quite noticable which usually indicates that the set screws(of where there are 4 front and rear) on the flats are loose. these are just my observations. |
damn that thing goes all the way through?
