mamba max pro problem

[BrianG]

Originally Posted by ta_man

I find this rather disappointing. For me, a major selling point of the MMPro was the switching BEC good to 6S (though I only planned to use if for 3-4S). If I have to use an external BEC anyway to run a decent power servo I might as well just just an original MM and the BEC (for 3-4S).

(Reminds me of my Havoc 3S, which, on 3S, needed an external BEC to run a good servo.)

I would hate to be in Castle's shoes TBH. People want more and more powerful systems in smaller and smaller packages. It has to be a design challenge to do so!

[RC-Monster Mike]

172oz/in at 6 volts is a high torque 1/8 servo - in fact only a scant couple servos with this power were even available just 2 or 3 years ago. 100 oz/in is plenty for a 1/12(and will be much easier on the ESC BEC). That said, I would think the MMP BEC should handle the load of this servo on this small vehicle as long as the servo is working as it should(worn gears will bind and cause high current draw in use, though).
Likewise, and standard linear BEC on a 3s rated ESC will be best served with an external when 3s is used - just the nature of the linear BEC and not specific to the Havoc.
Lets face facts here - the MMP is a 1/10 ESC intended for 1/10 vehicles - many folks here will be using it in their 1/8 buggies - the MMM is the Castle ESC intended for 1/8. The MMP is a cool little ESC, but it is half the MMM in reality and expectations need to be realistic. :)

I just think it's strange this wasn't noticed in beta testing.

edit: just read mike's post. So, I'll drop to 5.5 or even 5v bec output and it should be solved.

[jhautz]

so.... back to running external BECs. Great.

The more things change. the more they stay the same.

[BrianG]

Originally Posted by drkdgglr

I just think it's strange this wasn't noticed in beta testing.

edit: just read mike's post. So, I'll drop to 5.5 or even 5v bec output and it should be solved.

It's not really a "problem", it's the way it was designed. Dropping the voltage will help and adding a capacitor (~10,000uF @ 10V) can also help supplement the BEC under peak loads.

I'd rather limit the load on the bec, so I might just drop to 5v. The 985mg was the smallest servo I had lying around. I forgot I actually used that servo in a Muggy and it did okay. Kind of puts using this servo in the mini ste into perspective...

[Pdelcast]

/sigh

The MMPro BEC is actually just as capable than the MMM BEC, which no one has complained about.

The BEC on the MMPro wasn't designed to run multiple ultra-high-torque servos. It's a 1/10th scale and 1/8 buggy controller.

The current limit is set to about 4.5A on the MMPro BEC, but will fold back if the temps get high. Remember, this is a pretty small integrated BEC.

[sikeston34m]

After my "glitchy" run, I dissected the non-working servo and found it's control board burnt. Even though, it was the first time I ran it, I may have gotten a bad one. I replaced the bad servo, with another MG995.

After turning the BEC down to 5.0 volts, I just took another run. It did not Glitch a single time. Yes, this is running a Pair of MG995 Servos.

I would also like to add, the power delivery of this ESC is really smooth.

This is a light weight, low slung E maxx using a HC 8 Pole 1600kv Heli outrunner geared 14/52 (31 mph). Temps on everything were only slightly warm. The ESC's fan only came on one time during the 30 minute run.

A pair of 6S 26C 2600mah Kong Power Packs in parallel supplied the juice.

As for me, I believe the problems I experienced were to blame on a bad servo.

[suicideneil]

And they all lived happily ever after...

Heres a question then, and a good one at that (rare for me...); just how much torque do you really need to turn the rather small and lightweight wheels of a 1/8 buggy?

I have a pair of 645mgs in my 13lb truck, turning 1lb tires- thats about a total of ~250in/oz of analogue torque ( :P ) turning 2lb of rubber, and it does so pretty well.

Do we really need 200-300in/oz digital servos in 6-8lb buggies, turning tires that weigh... not very much?

[SpEEdyBL]

In my 8ight I use the JR 9100s which is 180 oz-in of torque, .06 seconds to 60 degrees at 6v. I highly recommend it.

[muck]

Originally Posted by Pdelcast

/sigh

The MMPro BEC is actually just as capable than the MMM BEC, which no one has complained about.

The BEC on the MMPro wasn't designed to run multiple ultra-high-torque servos. It's a 1/10th scale and 1/8 buggy controller.

The current limit is set to about 4.5A on the MMPro BEC, but will fold back if the temps get high. Remember, this is a pretty small integrated BEC.

because i am new to the large and nice of a ESC, i can use my new MMpro in a 1/8th scale buggy application?

[Pdelcast]

Originally Posted by muck

because i am new to the large and nice of a ESC, i can use my new MMpro in a 1/8th scale buggy application?

Yep. It was designed to work in 4S 1/8 scale buggy setups.

[muck]

Originally Posted by Pdelcast

Yep. It was designed to work in 4S 1/8 scale buggy setups.

very nice!
I was torn on this esc or the SW. Glad i picked this one up instead..

[Semi Pro]

Originally Posted by SpEEdyBL

In my 8ight I use the JR 9100s which is 180 oz-in of torque, .06 seconds to 60 degrees at 6v. I highly recommend it.

im useing the HS 7955TG (s) in almost everything i own, includeing my 8ight


honestly i may not need that much power but then we dont need 6cell in buggys either

well i ran the MMP in my 1/8 buggy D8 and all i can say is WOW ! smooth and fast no heat problems what so ever ! here is my set up
MMP
castle 2200kv
hyperion 4s 5000 g3
15t pinion
50 spur i think what ever stock is
the motor never got up past 100 and the esc would come off at 115ish after 7min
hats off to castle you guys did a great job !