9XL & Mamba Max Shut down!

...this is so weird...This happened to me last night with the Hellfire!! I came on to try and figure it out and here it all is already laid out!! Thanks forum...Once again you have saved the day!! now to fit all these bits into my machine...

QUESTION: if i DONT have a UBEC and i remove the red wire what happens?

[BrianG]

If you don't have a UBEC or a receiver pack, and you remove the red wire, your receiver will not get any power and it simply won't work.

[BrianG]

Originally Posted by GorillaMaxx360

so all in all i would be just fine running 2 lipos and i would not need any other source of power than the two lipos to run my reiever and settering servo right.

Correct. 2s is only 7.4v nominal, so the internal BEC can convert that to 6v fine without too much heating.

Originally Posted by BrianG

If you don't have a UBEC or a receiver pack, and you remove the red wire, your receiver will not get any power and it simply won't work.

10-4 BG!! Mental note to self: DONT cut the read wire :026:

ok got my ubec today but shop was to busy to wire it in for me. the ubec i got is a 6v & 5v which should i use? 5v? anyway the guy told me at the shop that i have to solder it on the black and red of wires of the esc cause my setup is a series for two pack setup. (do guys get me?) and the output should be connected to the rx right?

[gixxer]

that sounds right. 6v will give you more speed and torque for your servo.

[GorillaMaxx360]

Originally Posted by BrianG

You can run a 4 or 5 cell receiver pack for the servo(s) and receiver, but it just adds to the weight and it's just one more thing to charge. Far better is to use a UBEC to bring the main battery pack voltage down to 5 or 6 volts. This lets you use just one set of batteries - your main ones. The power needed to power the receiver and servo(s) is minimal compared to the brushless motor requirements so any difference in runtime will be neglible.

You CANNOT simply use a Y adaptor to directly power the receiver as the voltage would be too high. Even 2s would be too much. You do need a receiver battery pack or a UBEC (but as I said, the UBEC is a better choice IMO).

The ESC has a BEC built-in, but if you are running anything over 3s, you should definitely use an external one. The built-in one is a linear regulator and will heat up.

So i pretty much have to get the external ubec if i want to be acble to drive and work my motor esc and recever and servos. also if i dont the quark speed control will be shot. thanks

[BrianG]

If you use low battery voltage, like 6-10v, the internal BEC is fine. Any battery voltage over that and the ESC will heat up faster just because of the BEC. Whether it will fry the ESC or not is hard to say. Most should have thermal cutoffs to prevent self-destruction, but there have been instances of the internal BEC frying.

In short, I'd use an external BEC for anything over 6 cells/ 2s lipo for best results.

[GorillaMaxx360]

but i am using 2 orion 4800 wich is 4s so i pretty much have to use an external ubec right.

ok guys 1 more day to go till the nationals!!! I finally was able to install ubec and man my esc doesnt even heat up anymore plus have a fan over it! My only problem is that pinion and and grub screw loosens up after one run. i already put some locktight and still lost a pinion and grub screw. Also another problem is the hv maxx that im up against has the same top speed as i do his setup is 72/15 and im 66/18 foor gearing but i only have 12 cell nimh 3300mah 14.4 and he has 2s 4000mah 14.8. so what u guys think should i leave as is for the race this weekend?

[glassdoctor]

Maybe you can convince him to swap batteries with you, hee hee....

Sounds to me like you should be good.... except for the pinion issue.

You could try red loctite, if you have been using blue...
Or maybe use some JB weld around the grub screw, as if you were making the pinion thicker. This will give the screw a little extra something to bite, and act kinda like a locknut. Just a little mound of it surrounding the screw...

Maybe this is too obvious, but can you get the screw any tighter without stripping it out?

No all i could do is two turns for tightening the grub screw. anyway wat i was using was blue locktite. What i did last night was put some superglue. will be trying today if it will work.

[coolhandcountry]

If you are brave and have some sort of puller. You can put the loctite on the
shaft and slide pinion on to let dry. No grub screw required. Just hard to get off.

crazyjr: so u mean for my MOD1 11T&13T i need a 49-51 spur gear and a strobe slipper? who makes this kinds of spur gears and stobe slippers? m in manila so it will be hard looking for this things. or ill have to wait super long to get them from the states

ill ofna spurs work or kyosho with mod1 pinion? lets say 50tspur/13T pinion will this work for a small track with lots of turns and one straith away?