CelloFellow

@jb70: Thanks for including and acknowledging my little improvement to the left/right roll control coupling. And great catch to fix the interference I had overlooked. I'm tempted to tear down and rebuild to incorporate all the improvements you accumulated. By the way, I enjoyed building the 42115 Lamborghini with your improvements a while ago.

I have been building Efferman's wonderful modification, using version 1.2, and it is going well so far - great fun, and many thanks to Efferman for this significant work. I did run across what I believe to be a design flaw in the original LEGO design (which is unchanged in Efferman's mod) in the roll control linkage (controlled by the left/right motion of the joysticks). It has a problem where the two joysticks are not locked together properly for left/right motions. The two joysticks can be pushed together (the left joystick can be pushed right while the right one is pushed left) because they are each connected to a "Technic Axle and Pin Connector Angled #1" pulling in opposite directions on a common axle and there is nothing to prevent those connectors from sliding apart on that axle when the joysticks are pushed together. This modification fixes it so that the joysticks are rigidly locked together. I took the liberty of using Efferman's studio.io model as a basis for making these changes. I think this mod would also fit in the original LEGO build, but I don't know for certain. This is the original linkage (located under the front cowl in front of the instrument panel). The two joysticks operate the two yellow axles in tandem, but if the joysticks are pushed together, they actually pull the connectors in opposite directions and they slide apart on that common axle. And this is my proposed improvement. Some parts are shown with bright colors just for clarity, but they are all really black or light bluish gray. With this arrangement, the two joysticks are now rigidly locked together for roll control (left/right) just as they are for pitch (forward/back). I seems to fit well, and works fine. Can anyone see if I have overlooked something, or why this is not a correct mod? I couldn't see any reason the original design is preferred. But I'm no helicopter expert or master LEGO builder either! I have put instructions and an updated studio.io here (they are changes to Efferman's instructions for steps 166-178): https://bricksafe.com/pages/CelloFellow/roll-control-linkage-mod-for-42145-airbus-h175 Efferman, I hope it is OK that I used your instructions and model as the basis for this minor mod, and reposted the changed version. If not, let me know and I can remove the files. If you like the mod and wish to incorporate it into your model and instructions to make a version 1.3, please feel free - no source acknowledgment is needed.