heng long gear ratio

[igotit]

What is the actual gear ratio in the hl tanks gear boxes.

Every where i read 2:1 or 3:1
But common sense tells me 3:1 isnt the actual gear ratio.

Im assuming 100:1
Im planning installing a different drivetrain,dont have the tank infront of me though.

Thanx

[SteelBird]

This is the question I'm seeking for an answer too. To me, tanks should move slowly and powerfully. I am seeking for a retard gearbox as shown in the video below (the gearbox is claimed to be 3.8:1 ratio):

[igotit]

i think the numbers 2:1,3:1....ect refer to the first big spur gear and the motor pinion ratio....not the overall ratio of the entire gear box.
i know a 380 6k rpm motor running a 3:1 will produce 2k rpm at out put side....no way our track will handle that speed,not to mention the 380 moto doesnt have the power to move a tank with that low of a reduction.

[SteelBird]

I really don't know how to calculate the ratio. I just want my tank to be well controlled especially climbing hills. Someone on YouTube modify his tank to run like an F1. I think that both the gearbox and track aren't designed to handle high speed. He'll need a new tank soon.

[tao]

The 4:1 are geared lower than the 3:1. I also dropped the pinion from 10 tooth to 8 which results in 20% reduction on top of the lower 4:1 for my KT.

But here is a more comprehensive explanation from a post by Max-U52!

3:1 and 4:1 are meaningless, and 5:1 was made up out of whole cloth by Erik. They have nothing to do with actual gear ratios. An actual gear ratio for these would be (I think) around 56:1. That means that for every 56 times the pinion gear on the motor turns, your drive sprocket makes one revolution (I could be way off on this and it may be as high as 96:1, someone has counted but I can't find the thread). One explanation I heard for calling them 3:1 is that back in the day when Tamiya was the only game in town, someone started making stamped sided GBs and they were supposed to be 3:1 (three times as fast) when compared to the tammy GBs. I still can't confirm that. I refer to them as 3 shaft and 4 shaft GBs.

[igotit]

ill count my stock ratio soon....then we will know.
my rc skid steer loader is running 130:1,and its a good scale speed.
and you are correct for every (example) 130 motor rpms the output shaft will make 1 rpm.
this is what gives us power from a small motor with little amp draw.

my common knowledge tells me their is no way we have a 3:1 with that small motor pushing out tanks.
i run a 3:1 in my rc tug,its powerful and slow.im very familliar with gear ratios and the need for a gearbox.

[Tankbear]

Guys,

On the download page

downloads/

gearbox calculator has ratios of the gearboxes, it's a few years old so doesn't have the newer gearboxes but as far as I know the stock HL gearboxes haven't changed.

Ian.

[tomhugill]

Guys,

On the download page

downloads/

gearbox calculator has ratios of the gearboxes, it's a few years old so doesn't have the newer gearboxes but as far as I know the stock HL gearboxes haven't changed.

Ian.

Tamiya standard ratio are about 55:1 impact low ratio are about 100:1 so I would think henglong are 40/50:1

[SteelBird]

Taigen Tank wrote this on his YouTube video:

Usually 3:1 is used for plastic tanks or light tanks such as the Panzer III/IV models. The 4:1 is used on heavier tanks that require more torque. 3:1 will give a bit more speed at the cost of torque while the 4:1 will give more torque at the cost of speed. The 3:1 and 4:1 really refer to reduction gears. The actual ratio is a bit different (3:1= about 39:1 while the 4:1= about 90:1) so hopefully that helps

[Max-U52]

This can of worms again!?!