Schulze w/4S Lipo

[Rocksalt]

Will it work, has anyone tried it?

Says it's rated up to 12C.. 14.4. Lipo 14.8 nominal, 16.8 peak.. What is nimh peak?

Seems like it would work, no?

Are there any BEC onboard problems with 4S?

[Rufus]

Interesting... I was about to ask something similar. which Schulze are you refering to?
I plan to get a U-force 75/pletty extreme and a 3S Lipo for my XXXT but wonder if even the 3S will be too much... anyone tried 3S or 4S with that combo?

[Rocksalt]

Didn't know they had the manual in English. All the paperwork I have is in German. They say 'yes', you can use 4S lipo :)

Yes, I was talking about the U-Force 75.

The manual talks about the BEC a little. From reading it it sounds like they would prefer you use a separate pack as the extra voltage is turned into heat(BEC 5V, pack voltage 11.1, 6.1V wasted into heat\watts).

[starluckrc]

Extreme is not meant for 3S or higher. It's been tried. Craps has the smoke esc to prove it.

[Craps]

Extreme is not meant for 3S or higher. It's been tried. Craps has the smoke esc to prove it.

Jamie is right. I did not change the gear from running a 2S pack when I went to a 3S pack and it smoked the ESC. It might not have done that if I went to a smaller pinion. I did not try it again because I was just playing around and the 2S pack is more power than I can hook to the track anyway with my 2wd truck.

[Rufus]

wow... thank you for that info. You just saved my wallet there!

I did not think 3S would be that bad on the plettenberg. A while ago I emailed plettenberg and they said the extreme handles a maximum of 10 cells :confused:

Still, i think I'll get the u-force anyway

[Craps]

Plettenberg Extreme can take it. It is the Schulze U-Force 75 that I smoked.

[Rufus]

well, too bad but Isn't it rated for like 12 cells? was the damage covered under warranty?
I hope so... that's a pricey ESC!

[TimisTim]

It proabably had something to do with the extra stress of the 4 poles. It seems like most of the smoked schulzes I have seen were running higher pole motors. I haven't had one actually "smoke" yet but I have burnt up quite a few fets.

[Rocksalt]

I was doing some numbers last night and couldn't really see why the extreme or the shadow couldn't hold up to 3S lipo. The current is well below ESC rated at 45,000rpm with the shadow in comparison to the spec sheet. There is a grey area at certian RPM in the 30,000 range though. Something like 107A nominal! I believe the test sheet was with no load, but I am not sure. Seems like a no load spec sheet would be meaningless. If so, then the current would definatly be to high.

I was also wondering if Craps ESC fried due to an overrev condition. If the fet's weren't switching fast enough at high RPM then the commutation might be lost with 4 pole and it might single phase and throw the current out of the park.

Do those that use the schulze solder the 3.5mm plugs to the ESC? The wires are EXTREMELY stiff on the shadow motor and any movement on the ESC will cause the female plug to open up bigger. The plugs also need a certian amount of tension on them to make good contact. I had one pull out on me and the motor single phased. Good thing I was not racing. I saw it immediatly and soldered it in direct. If I have to change motors I think I will just splice in some silicone wires and leave it this way. This, to me, is the only downfall of the schulze, with the exception I could use more current capability. The shadow is MORE than enough for 4wd though and has grown on me the last few weeks. This thing flys AND is, so far, very dependable.

[TimisTim]

Hmmm, I used my UF75 on 4S today and it was glitching very bad. I would get a very hard stuttering during acceleration every now and again. When I turned around the throttle was very sensitive and would make the truck just take off on its own for a second or two. I thought that the BEC couldn't take the current.

My setup was in a xxx-t with feigao 8s (he he) geared 22/86.

[OptimaMan]

I use 4s all the time with my U Force 75 w/no problems... Just make sure you use a small pinion if you use a hot motor.

[Craps]

I use 4s all the time with my U Force 75 w/no problems... Just make sure you use a small pinion if you use a hot motor.

That is why I smoked my Schulze and I was running on a small track that uses alot of partial throttle that is harder on the ESC than full throttle. Drop that pinion size when you go up with the number of cells.

[Rufus]

Optimaman, your setup with 4S must be a missile! how fast is it?
Craps, I thought that the uforce had some sort of thermal shutdown...
any idea on the max temp the schulze could handle??

I guess it would be good if I keep an eye on those temps when trying the pinions...