Mamba Max Tweaks and Mods Continued - Page 4 - RC-Monster Forums

GriffinRU · 10.28.2007, 03:24 PM

Quote:

Originally Posted by DrKnow65

Awesome! Now just fo find the perfect copper finned heat sinks (6mm tall, 24mm wide, and 32mm long- with the fins running along the length). What grit sand paper are you using? I do plan on using the new arctic MX-2 since the the whole esc will be held togeather by the case. Then I could open it back up and mod it more later without dealing with the thermal adhesive...

P.S. why use brass as apposed to copper? copper is a better conducter right?

I was also thinking about stacking copper tubing 2 high (like a honeycomb) and gluing them togeather with the arctic silver then MX-2 to the fet's. would that be effective or should I continue the persuit of somthing finned? Not sure of the purity of copper tubing...

Start with 220 grit, finish with 500.
Brass is easy to find.
I don't think that finned copper heatsink required for our application. Just copper/brass plate on the bottom and stock heatsink on top, with FAN should be good up to 150W of dissipating power ~80 Degrees C. You can stick brass plate in between top FET's and Alum heatsink, but that would be just a caviar :)
You need to make entire sandwich work for your heat spreading needs - brass/copper plates/FET's/PCB/FET's/Top heatsink. Brass/Copper for speed and Alum/PCB for mass (Cp).
And, yes you can ran FAN from internal power, just keep it under 100mA and solder on capacitor.

DrKnow65 · 10.29.2007, 07:27 PM

Update, just ordered all my bit, pieces, and wires. So excited, to bad next day air is out of the budget :)

I also have been chatting with PatrickDelC on a different forum and he is willing to sell me an additional power board, just waiting to get a PM from him to see what he wants for it.

Anyone around here have an extra power board (the newer style) they want to sell? I wasn't planning on doing the dual board thing but the idea is itching at me, so if I can find one cheap...

How has the success been for the guys running 5s and 6s on the modded MM's?

Artur, I decided to go with aluminum heat sinks as copper is heavier than I thought. I will use the brass on the brain board and it's components.

suicideneil · 10.30.2007, 07:24 PM

So far only one person that I know of has had the Mod2 treatment (double decker) done to their MM, and it was running fine until they got a stone caught in their gears which caused the motor to stall = instant death to the esc....

GriffinRU · 11.02.2007, 03:03 PM

Quote:

Originally Posted by suicideneil

So far only one person that I know of has had the Mod2 treatment (double decker) done to their MM, and it was running fine until they got a stone caught in their gears which caused the motor to stall = instant death to the esc....

I shipped double-decker to Mike only and looks like he is pretty happy with it, no smoke yet :)

I am in process of fixing the one which "caught stone".

suicideneil · 11.03.2007, 07:58 PM

Hehe, the esc got 'stoned' and blew smoke out... sorry, that was a lame gag.

lxmuff · 11.03.2007, 08:12 PM

Hi GriffinRU. What are your thoughts about the new MM having 30 fets vs the old with 36.

Quote:

Originally Posted by GriffinRU

I shipped double-decker to Mike only and looks like he is pretty happy with it, no smoke yet :)

I am in process of fixing the one which "caught stone".

GriffinRU · 11.03.2007, 08:30 PM

Quote:

Originally Posted by lxmuff

Hi GriffinRU. What are your thoughts about the new MM having 30 fets vs the old with 36.

So far looks like better fet and there are improvements in layout as well.
I'm in process of creating double decker from new (3d, 4th?) generation.
We will see how it works.

smokyracing · 02.26.2008, 04:23 PM

hey can some one shot me a link to the origanal post I can find it and want to know how to take off the heat sink and do the mods to my mm esc thanks for your help

suicideneil · 02.26.2008, 04:37 PM

http://forum.rcdesign.ru/index.php?a...showentry=4093

All the info right there.

GriffinRU · 02.29.2008, 04:58 PM

Quote:

Originally Posted by smokyracing

hey can some one shot me a link to the origanal post I can find it and want to know how to take off the heat sink and do the mods to my mm esc thanks for your help

Heatgun works great, just heat it up to 80-100C and carefully remove it with razor blade or similar tool...

In case you are going to use screwdriver method -> do not press too hard on PCB and watch for copper traces an so...