Heng Long TK6.1 vs HL RX18  v4.0 MFU_why your turret slowed down after swap from older to newer MFU
Channel: Abramsky PL
Date: 05/06/2021

In May 2020, when I replaced the old MFU with a new TK 6.1, it turned out that the turret slowed down. Then I made this video for comparison purposes. But only now was I able to prepare them for you
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Heng Long TK 6.1 MFU vs Heng Long RX18 (v4.0) MFU
Why your turret slowed down after changing old electronics to newer one TK 6.0/6.1 MFU ?

The goal - tune the turret rotation speed to the actual speed in a modern MBT...
  Why is your turret turning too slow after switching from old electronics to new modern 6.0 / 6.1? It's easy. Heng Long lowered the voltage of the ESC responsible for powering the turret rotation. In the old version of RX 18 / 4.0 (possibly also in 3.0 and 5.3), the maximum power supply voltage of the tower is about 8.10V DC. Whereas in the newer TK 6.0 / 6.1 the voltage was lowered to 5.80V DC. However, in my TK 6.1, when turning the tower to the left, I get a maximum voltage of 5.80V DC, while turning right is a maximum of 5.30V DC. Weird. The minimum turret rotation speed also depends on the supply voltage. In the old RX 18 it is about 0.89V DC, while in the TK 6.0 / 6.1 it is 1.2V DC ...
As a result of changing the electronics on a standard engine (130 type) with a green cap, the full rotation of the turret will slow down from about 10 seconds to around 12.5 seconds
Note. The speeds I give depend on the diameter of the gear in the tower and they may differ for you.

To remedy this - the easiest and cheapest way is to replace the turret drive motor with a faster one. I chose the Type 130 Black Cap 16500 RPM at 3V DC. The cost of such a motor is about $1-2.
As a result of this modification, I got a full turn of the turret around 8.5 seconds, which is very close to the original - a full turn of the turret in a real M1a2 Abrams is about 9 seconds.

It is also possible to replace the turret drive with a servo (modified), but the speed of rotation obtained in this way will significantly exceed that of a real MBT.

I invite you to watch my other videos:
First ride with TK 6.1 on board:
https://youtu.be/viMNWTamV1s
https://youtu.be/irG7II8NSW8

The whole process of rebuilding (lots of photos) you can find here:
http://rctank.pl/forum/viewtopic.php?f=114&t=2432

And here is my latest improvement - main gun engine deck sensor (auto tilt mode) - final demo:
https://youtu.be/njP4UOyDYYo

Enjoy :)