I'm sure you guys have seen this, maybe the guy has even posted it here.....if you haven't, well here it is. I've seen this a few times on the tube, just never remembered to ask!


For the guys who have and really understand gearing.......why and what purpose would this serve over a 3:1 gear box? Is this overkill? Looks painfully slow when dual gears are engaged, but does have the torque, no doubt.



This guy has a few more of these tanks posted, like the KV1 (cant believe he did this to a Tamiya) and JagdP.<br type="_moz" />

Basically it's just a 2 speed transmission. An enormously over complex 2 speed transmission. I guess he wants painfully slow speeds and high upper speeds. To each their own. I commend him on a unique implementation but he's taking up tons of space for it. I find the 3:1 good compromise as the stock HL gear is too fast/weak and the 4:1's and 6:1's I have made, while more realistic in scale speed are painfully slow to pay with.

Perry

Yeah, I've seen some of your older threads from way back before there were 3:1 gear boxes available. What happened to those?

I have the Asiatam 3:1 gearbox with Graupner speed 400 with 12tooth pinion,I based this on Swathdivers excellent gearing calculator in EXCEL FORMAT. But their is no need I can see for the type of gearbox modification displayed in the video,what is really gained and what is lost? That is the real question from my point of view,Saxondog

Yeah, I was thinking that was overkill....but maybe that has potential if that were geared to initiate a 3:1 or lower gear set up when the time calls for it,....but not a wounded turtle crawl. I could have sworn I seen a beetle run past the Tiger climbing out of the hole! lol

Some still running strong, some self destructed. Buy them or build them, it's always a crap shoot with gearboxes.

Perry

While this is a difficult solution to the problem of slowing the tanks down, there is a reason, at least in USA and former SSSR. For competitions, the tank must have a scale max speed. There are generally two max speeds listed in most tank spec sheets, the max road speed and the max off road speed. Worlds apart.
Off road max speed is generally listed as the max speed allowed for the tank on a reasonably smooth non improved area. Generally, the German tanks, especially in mid and late war, were faster than most Allied tanks off road, because of their wider tracks and excellent suspension systems. T 34 and Pershing were two exceptions.
However, max off road speed is also a misnomer. Too many variables as to local terrain, the odd ditch here and there, swamps, forests, etc. One can't just go bucketing across hill and dale without reconing the AO first, and also you must consider the crew bouncing around inside.
Many of us use the ZUH19 Gear Down bolted to our Tamiya trans to get the proper speeds, using one of the 3 provided pinion gears to tweak the speed. I go for a mid max between max off road and max road speed. Gives a good medium for combat. As you take hits you still have some speed and maneuverability, but still have the ability to sneak and peak, and to shoot and scoot.

i have the ZUH19 schumo 3/1 ratio reducers on my tiger and with the stock pinion size maxx speed is a little under 1mph but it will crawl up a steep vertical hill on its lowest power setting no problem.

Does your Tiger have Type 1 or the later Type 2/3 gearboxes? How many teeth on your motor shaft pinions and geardown output pinions?

I've got Type 1 gearboxes with 12-tooth on the motor shafts and 10-tooth on the geardown output shafts and my max speed is quite slow. I have not measured and timed a trial run yet to check what the actual speed is.

I think he has Type 3's. On yours, put the 14 tooth on the motor and give it a whirl. Comes pretty close to good off road speeds.