Rascko

BTW, question to all, who have tried Sbrick with servo motor - does it allow to have "feedback" (i.e. could Sbrick get information about position of servo motor and return it to user device)?

For all hardware-related stuff it's a common issue: in general, variety of iOS devices is much smaller, than Android ones, therefore it should be easier to test apps on iOS => less quirks in final product.

Could you somehow measure it or check, whether it is a hardware limitation or delay of managing software (the simplest way is to try other device on the same Lego creation)? I'm interested in this, because I'm waiting (or, maybe, hoping, but I've read, that SDK release is at least planned) for SBrick SDK (or something like this) to give commands via Sbrick from my own programs, and if delay is big enough, it might be not the best suitable solution :(

Yes, it is :) In general, 42025 suits not so well for towbarless tugging - it has short landing gear legs, like many cargo planes have, but I'm planning to rebuild it into something like Saab 340/HS 748/Il-14 (or even something like Lockheed Connie, if I will have all the needed parts and inspiration :) ), where landing gear legs are much longer.

Actually, this one is my second try to do such a thing.The biggest issue (when speaking about this kind of Lego machine in this size) was a bending - due to huge weight back parts tended to bend/collapse to center, as far there shouldn't be any transverse supporting elements to give enough space for landing gear to enter. That was actually the reason, why I decided to use 2 L-motors for driving wheels separately - transmission from one XL-motor suffered much from bending, it all tended to clicking gears, so, finally I've decided to use one motor per rear wheel to drive - shorter axes and less gearing provided much more comfortable driving.

Good morning to everybody! While not having big experience in Lego building (actually, it's only ~6 months after I've bought my first set in my adulthood), I'm interested in aviation, and, therefore, I decided to build something aviation-related. General idea of build was to create machine, similar to Douglas or Goldhofer heavy towbarless tug: After I will complete this build, I'm going to rework my 42025 Cargo plane into one with longer landing gear legs, to make it towable by tug, I'm going to show in this topic. For now, mechanical part is almost complete (only two remaining things are mounting switches for turning on battery box and switching functions for M-motor), but bodywork is in the earliest stage - it is more about "set some borders and see overall size". I also still working on front axis "stability" - due to huge size and weight of model, after driving/steering wheels are standing not so straight vertical, so some reinforcement still needed. Functions: 2 L-motors for driving 1 Servo for steering 1 M-motor for raising cabin and positioning front part of landing gear leg "holder" (via gearbox, manually switched) 1 XL-motor for opening/closing beams, holding landing gear leg (I was actually ran off motors, so used XL here, even had to use clutch gear to prevent breaking other gears in open/close system) Planned manual functions: 1. Opening doors in cabin 2. Opening motor bay doors And finally some photos of "what was done" (and a big sorry for mess on table:) ). After I will clearly define "what should be done in bodywork", more photos will appear.

I've taken not so many photos, and now it's disassembled, because I'm building another MOC. Some photos below (under "spoiler"):

Just reviewed rules to check whether thing, I'm going to build, match them, and got two questions: 1. In rules we have: >>The model needs 2 PF IR Receivers which can be replaced by one or two SBricks. Does this mean, that PF IR Recievers should be placed in such position, that they could be replaced by 1 SBrick, or it's just about utilizing no more, no less, than 4 outputs of receivers 2. And some more about number of functions: if I'm using two motors on one IR output, but these motors are not connected mechanically (via gears, axes, etc - like in situation, when we have two motors for two wheels, each driving separately) - does this count as 1 function or more?

I've tried to create an airport tug from it: But, as far as it was my first MOC after a long "dark ages" gap, results weren't too satisfactory for me: it had poor steering and cabin lifting worked not similar to any prototypes.

Open SDK/API for Sbrick, just to have cheap Mindstorms analogue via any SOC solution, like Raspberry Pi :)

What is the total expected weight of the overall construction and what is the expected length of wheel leg?

What about 3rd party rubber bands? And one more question: after publishing completed MOC to entry topic - is it allowed to share its photos in Facebook/anywhere else or I should wait till the end of contest?