8880 MOD: Completely redesigned AWD-RWD-selector

[Kumbbl]

Some weeks ago i have posted a solution for an AWD-RWD-selector for the 8880, but in the meanwhile i found my first approach somehow clumsy and not realistic...

Therefore here is a complete reworked design which is IMHO now much more realistic in function and usage.

First the final result:

Direct behind the shifting gate and between the seats you see two additional lever:

- The left one (next the driverseat) is the selector for AWD (all-wheel-drive) or RWD (rear-wheel-drive) mode: so now the lever is there where it should be: close to the driverseat

- The right one is a selector-gate for two steering modes (details can be seen here: http://www.eurobrick...showtopic=79125 - most of the details are stil valid, some modifications caused by the AWD-RWD-selector are mentioned in this new posting)

Well, now how it works:

1. the changed drivetrain (level 0):

The original direct connection between A and B has been removed and replaced by the new green marked train, which includes at B an additional drivingring, a clutch gear and a selector. In the left position (as seen below) the AWD is active, in the right position (drivingring connects directly to the differential) only the RWD provides input for the transmission gearbox for driving the engine (or vice versa in case of motorization)

2. setup and design of the changeover catch:

You see that 2 gray bricks 1x3 have to be replaced by a small modul built up with plates which holds a 2x4 plate with holes which in turn holds the axle for the changeover catch

3. Complete drivetrain a level 1 (steering level):

You see how the new ADW-RWD fits in the complete new design of the steering drivetrain:

- green is the new steering drivetrain (see above the link to the posting which describes the two steering modes)

- red is the replacement of the ugly chainlink and it's a speedup of the engine pistons by factor 3 (24th --> 8th) --> results in really "flying" pistons (and dramatically alleviates motorization because it eliminates the original overdrive)

- yellow is the changeover catch axle for the AWD-RWD-selector

4. the new selectors-gate:

5. some other stuff:

HOG-setup:

engine setup (as original):

7. Again the final result:

Summary:

With this AWD-RWD-selection, the mentioned two-steering-modes (see http://www.eurobrick...showtopic=79125) and my sliding seats MOD (see http://www.eurobrick...showtopic=79397) the 8880 is now one of the most functional (ie. no bodywork features like opening hood, doors etc) featured supercars at all... now i'm quite satisfied with the icon 8880

Now i will invest some mind power to the bodywork, especially opening doors would be nice...........

Edited March 26, 2013 by Kumbbl

[Lakop]

can you RC it?

H

[Someonenamedjon]

can you RC it?

That would be nice :D

[efferman]

why everyone want at every time RC in the models? is the complexity of this drivetrain not enough?

[Kumbbl]

why everyone want at every time RC in the models? is the complexity of this drivetrain not enough?

Thank you efferman, very well spoken! I have a very special opinion to RC-ing of lego supercars: completely unnecessary (no offending of people who build such cars! ;-)

Why: Lego and its motors and transmission parts have never been designed for usage in RC controlled cars. some weeks ago i gave my son an RC controlled BMW X3 and i have to say i is a lot of fun to play with it. But why is this fun: because the cars is fast and has power.. IMHO playing with RC cars is only fun if these cars can drive really fast and have enoughe torque to climb up some hills (fast)

But what about lego cars: If motorized they are ALL very very slow - beyond all bearing! Therefore IMHO the official lego set 9398 is a very boring and bad set... boring build and boring play and no learn effects for kids (except from the fact, that obviously lego is not good for RC-ing cars ;-)

Motorizing (and RC-ing) of helicopters, space shuttles, excavators, backhoes or other machinery is ok and adds play-value - but for supercars the value is in the realism of the features and in the learning effect how some features of the real world cars work... (therefore IMHO the 8880 is still far beyond of all other supercars - just one example: only the 8880 has a gear shifting which comes in the closeness of a real gear box - all current (8448-based) gearboxes are far away from this, because these gearboxes are more or less like multiplexers like the 8480)

There are many very impressive supercar MOCs out there, but i admit all RC-controlled have never impressed me (reason see above: too slow and weak)... whereas all manual driven with great features or great construction are very impressive...one example: sheepos Landrover would be equaly impressive if not motorized, just the working breakes, sequential shiftbox, clutch etc. are enough to be a great supercar (i really admire these features a lot but not the motorization of it)... but as a RC-model it is still somehow boring, because too slow and weak...sorry, sheepo ;-)

so: let lego do what lego can do and what lego is meant for! And RC-ing of cars belongs not to that (at least not with current motors and transmission parts) - reasons see above.

Just my 2 ct....

Edited March 27, 2013 by Kumbbl