Lego Unimog 8110 enhanced

We have modified the unimog with RC-control, two gear automatic, steering while keeping all other functions. Also the design is preserved as much as possible. 
- Steering is done by an M-motor located at the front axle with a gear 1:9 and a friction clutch. This location is better for a low balance point and there is no problem with the loose force transmission when the motor is placed in the driving cab.
- Two gear automatic drive. The fast gear is driven by an L-motor. If the rotation speed gets too low, an XL-motor takes over the driving with low transmission ratio. A freewheeling mechanism decouples the XL-motor in case of fast velocity. Be aware that the L-motor maybe must be reversed in its direction because otherwise both motors work against each other. The vehicle can climb up to 100% slope. A hand made part is necessary. Cut a half long bush in two parts and polish them with sand paper down to 1.2mm thickness (see photo). It makes a well defined friction at the freewheeling unit.
- Lockable middle differential gear. The off-road mobility is much better if the middle differential gear is blocked. We reinforced the differential with a fourth gear wheel. Then it stands more than twice the force.
- The left back wheel suspension is half a stud higher than the right one to balance out the weight of the battery box.
- LED lights front and rear
- Rotating orange flash light beacons on top of the cabin. Circuit and bom included.



bom for beacons:

parts available at www.reichelt.de

Artikel-Nr. 	Bezeichnung 					Menge Einzelpreis Gesamtpreis
NE 555 D SMD 	Timer, SO-8 					2 	0,18 Eur 0,36 Eur
SMD 4017 	CHIP-IC, CD 4017 				2 	0,25 Eur 0,50 Eur
LO P476 	OSRAM Point LED, 355 mcd, orange 		25 	0,23 Eur 5,75 Eur
SMD-0603 	470 SMD-Chipwiderstand 0603, 470 Ohm, 1% 	100 	0,02 Eur 2,50 Eur
SMD-0603 	21k5 SMD-Chipwiderstand 0603, 21.5 kOhm, 1% 	4  	0,10 Eur 0,40 Eur

lego power functions connection cable
base plate

We used the single wires of high frequency litz wire (100x0.1mm) for electrical connection of the beacons to the control circuit. They are coated each and they are thin enough. The silk wrapping can be used for covering the cable. Available e.g. at Menting (www.spulen.com). Other wires are also possible of course. 




Unimog in action:
http://www.youtube.com/watch?v=_-U8WPuWFfE

gearbox separated:
http://www.youtube.com/watch?v=jvj631YWt30

crane with double cylinder:
http://www.youtube.com/watch?v=GFF6CXRMVA4