SGNerf's High ROF Stampede

To start off this thread, I was looking through SGNerf's modworks site as I haven't visited it for a couple of weeks when I stumbled across the orgasmic findings of his Stampede (modified) to go at a ridiculously high cycling rate. This will make you Nerfer's jizz as you probably know when you watch airsoft videos you wished that Nerf had the same ROF with battery powered things. So here we have it! All credits goes to SGNerf...

Video of his Progress


Video of his final results


Just to confirm having a high rate of fire does NOT increase the power of any gun. It's just a common myth. Since if they spring is pretty much the same, just because it cycles faster, does not mean it shoots darts further. :). I've been watching this video over and over and over again now :D.

that will be fine with stock springs, i dont know how one will go after a spring mod... But i guess we will find out soon enough.

According to what he has moded is an improved o-ring, a slightly stronger aftermarket spring and AR removal :D. It sure will beat the vulcan :P.

definitely own the vulcan, i hope the stampede takes drum mags if it did i am getting one

Of course it takes drum mags.
Damn that ROF looks uber awesome. Is there anyone on this site that has the skill to pull something like that off?
-Adam-

nerffirefight24 wrote:Of course it takes drum mags.
Damn that ROF looks uber awesome. Is there anyone on this site that has the skill to pull something like that off?
-Adam-

Yeh look over here, ill get that out of it, But just remember the bigger the voltage, the heavier the overall weight and the Stampede weighs around the same as the vulcan.

if it weighs the same as the vulcan its time to minimize it jokes, you could just use 2 9 volt barrerys that you use in your smoke alarm? there not that heavy compaired to all them huge bulky barrerys.

edited because of spelling...

2 x 9volt batteries will be dead in a few minutes cause they dont have enough ooomph (amps) to run the gun for a long time. You also need high amps and high voltage, hence the extra weight you will need to carry.

Dont write off the vulcan i was getting 70ft from mine yesterday.

sorry didnt mean to write of the vulcan, well i guess seme auto guns cant be light

if it was only 1kg+ it would be the best.

I wonder if the batteries from rc cars would be any good, the ones from Tamiya rc's.

Dylbot wrote:I wonder if the batteries from rc cars would be any good, the ones from Tamiya rc's.

They would be fine. You may need to put a few pack together to get the best voltages, but other than that any battery would be fine.

with high RoF comes high ammo usage. Going to need to stock up on those big clips (maybe find a way to get the stefans working with the drums)

I connected a 7.2 V battery that's used for rc's to my Vulcan with alligator clamps and it fires about the same speed as new D batteries, but it's also alot lighter and you can recharge the battery. I'm just worried that the motor will shit itself, or the wires will somehow touch and then I'll have a melted Vulcan.

Ladies and gentlemen, I will tell you one thing - if SGNerf can do it this well, Servulus will probably do it better. I can't wait to see the ranges this thing is getting.

Dylbot wrote:I connected a 7.2 V battery that's used for rc's to my Vulcan with alligator clamps and it fires about the same speed as new D batteries, but it's also alot lighter and you can recharge the battery. I'm just worried that the motor will shit itself, or the wires will somehow touch and then I'll have a melted Vulcan.

Remember a vulcan uses 9volts to power it, and you only put in 7.2 volts, now go try 2 battery packs together. The only thing that you may burn out is the motor.

I put two Battery packs together and......

Servulus wrote:

Dylbot wrote:I connected a 7.2 V battery that's used for rc's to my Vulcan with alligator clamps and it fires about the same speed as new D batteries, but it's also alot lighter and you can recharge the battery. I'm just worried that the motor will shit itself, or the wires will somehow touch and then I'll have a melted Vulcan.

Remember a vulcan uses 9volts to power it, and you only put in 7.2 volts, now go try 2 battery packs together. The only thing that you may burn out is the motor.

Make up a new mount to take a different higher voltage motor

there is no point in that, as you can use the original mount and you can go out and find different motors to fit that same mounting points.

I have here one motor i bought,it is infact a 7.2 volt motor, but it doesnt work with the 9volt pack, the motor works fine, where the problem lies is i think the gear on the pinion is slipping.

Servulus wrote:
I have here one motor i bought,it is infact a 7.2 volt motor, but it doesnt work with the 9volt pack, the motor works fine, where the problem lies is i think the gear on the pinion is slipping.

Make it out of something more durable and/or secure what it is attached to

easier said than done here, the pinion on the second motor may be too short too, but i havent taken the gearbox fully apart to check if everything was lining up right and i really dont need too either. I am still having no problems with the stock motor i dont mind the slower rof, since for me all i wanted was a vulcan that could get good ranges. I am now able to get 70ft from my vulcan, and once i get the parts i need mirrored and the belt feed reversed on a second vulcan and a staggered rof between the 2 vulcans, i will be happy.

I have neither stampede or vulcan so cant see for myself whats going on, whats limiting rof or how it could be improved

Are you planning to wire one trigger too both guns?

um kind of, but i may need to wire together something fancy to make sure that i get them to stagger fire when operated together, as i also need to be able to operate them individually from time to time too.

The rof is controlled by a another a gear cluster. (sorry there is a word for it but right now i cant think of it)

Sorry I don't know much about power, voltage and current (besides P = VI), however is the remedy for a high capacity, high voltage powerpack (say lith-ion) going to be simply a smart (and heavy) balance of a bunch of batteries (say rechargeable AAs) in parallel and series? It'd be a good way to prototype what type of voltages and capacity you'd need before committing to proper cells

I'd suggest measure the stock RPM for the stock RoF, then calculate what RPM you need for the RoF you desire
Purchase a brush less motor designed for the voltage you have from your battery pack that provides the RPM you want.
For something more advanced use an ESC and a variable trigger to ramp up the motor speed, this will limit the sudden shock to the internals of going to full power

Im gonna do the internals mod to day and by some reachargable batteries tommorow.