WCP SdKFz. 251: Herr Doc at it again

[Herr Dr. Professor]

I'm back to Will's WCP SdKFz 251, puzzling out how to set up the electronics with the FlySky FSiA6X. So far in an attempt to copy the little Jeep settings, I have apparently managed to mess up the settings of that. OOPS! "One step up and two steps back." (https://www.youtube.com/watch?v=MkFQHScyti0).So I had to get the little Jeep set up with the FlySky again.


Here's my guesswork layout for the SdKFz 251 so far. I really don't think I have it right, as only the front steering works---and, yes, I have not yet soldered the connectors for the motors. (I wish the electronics set up were as easy as soldering.) (The full instruction manual for the FlySky, not even supplied with the TX, is wretchedly written. As to instructions for a Dual ESC: they don't exist in writing, and I have seen lots of them on YouTube, real humdingers! )

Set up LiIO-ESC-RX.jpg (509.61 KiB) Viewed 654 times

I have also noted Will's comment two above "I will have the new control board for my 251...." Hmm.... Will it come with simple, clear instructions? Do simple, clear instructions exist anywhere among RC land.

[MrChef]

I think it's a cool project that I look forward to see come to life. I can't be remotely helpful with electronics but I do like the fuchsia wires.

[Model Builder 4]

Hello professor,

Although I'm using a different receiver to yourself ( Dsmx ) the settings should be pretty much the same, here is a link to a thread which I showed my halftrack setup on
viewtopic.php?t=37158
You will need a small Y harness as the steering servo for the front wheels and the esc which control the track motors can be plugged into the same channel which is channel 3 on my receiver and acts as the throttle, this will then control the steering direction and track turning in unison on the same radio control stick then, the single yellow wire coming from the esc controls the steering direction for both the steering servo and tracks and is plugged into the signal pin ( the top most pin ) on channel 2 then.
With this configuration it acts as the full scale vehicle did, the front wheels were not power driven and were used to aid steering only, the main drive came from the tracks. If the front wheels were only turned under 15⁰ both tracks would still drive in the same direction but if they needed to turn sharply and the wheels were turned beyond 15⁰ the tracks would then act the same as a tank with only one powering forward dependant on direction, once you have the basic setup right you may just need to change over the cables going to each motor to make sure they are both going in the same direction as each other and turn the way that you want it to, get the basic functions done first then work from there

Cheers, Lee.

[tomhugill]

That speed controller is tremendously powerful. 320A is A LOT.
All my tanks eat a maximum of 10A.
The torro 251 had enough with less than 2A.
Even the monster 1/6 panzer I worked on several weeks ago, had enough with 30A, so go and figure.

So, my tip is look for something much smaller and cheaper.

The 10A should be OK.
https://www.aliexpress.com/item/3300831 ... ry_from%3A

China amps

[Herr Dr. Professor]

Thank you, Model Builder 4: "You will need a small Y harness..." Indeed, some time ago I spotted your build and immediately printed out the image (viewtopic.php?t=37158). I have also been watching YouTube videos to see how others handle the tracks/steering wheels interrelationship. I had noticed that some use a Y harness because they are using a single ESC. Apparently the same is needed for the dual ESC, and as I though over the matter, that makes sense to me.

[Model Builder 4]

Hello professor,

Technically the esc that we are both using is still a single esc but with dual outputs allowing for two separate motors to be controlled ( quite a nifty bit of kit really ) the reason why I like this so much is that the tracks and front steering wheels can be operated on the same stick which makes it a lot easier than trying to operate both separately, using this setup they work in unison and look more realistic both working on the same stick

Cheers, Lee.

[Herr Dr. Professor]

At my last attempt (a week ago) I could not verify that any power was going to the motors, but I can check with a multimeter. I have also been wondering about "mixing"; I think I may have done some with my Jeep, but I am not sure, as at the time I was just fiddling with the "ends" of the channels and the throttle curve.

Right now I am enjoying a viral infection (not Covid, just what we call a "cold," albeit a nasty one). When I get up and about more, I will see about creating a "Y" harness.

[Model Builder 4]

The servo Y lead or harness can be bought for a couple of pounds online professor, the one I've shown is only 7cm which is perfect for small spaces where room is at a premium, hope this helps

Cheers, Lee.

Sent from my SM-S921B using Tapatalk

[jarndice]

£4.79 E-Bay.

[Herr Dr. Professor]

A fine seller on Evil Bay quickly provided five "Y" harnesses, and last night I fiddled with one, only to discover that I probably don't need one, as I actually prefer controlling the track running separately from the steering. Now my concern is that I do not have the tracks working differentially. That is, for the tracks, its forward or backward only. This may be adequate for my uses, as I do not run my AFVs outdoors much, if any at all. I will try it out soon. If I do need differential track running, or just insist on it ( ), I will do more head scratching.

Set up LiIO-ESC-RX working.jpg (555.45 KiB) Viewed 101 times