Serv's Spring Sales: Stampede & Vulcan

eBay: Stampede Spring

These are the same ones I use in my Stampede, running on a 12v, 2.2A sealed lead acid (SLA) battery.

Stampede Spring Specs:
Load Rating: Approximately 11-12kg (11.77kg)
Outer Diameter: 23.88mm
Wire Thickness: 1.98mm
Length: 110mm
Number of Coils: 10

Springs are $10ea

Postage is $7.60 Australia Wide, combined postage available.




Vulcan Springs

eBay: Vulcan Spring

Spring Specs:
Load Rating: 11kg
Outer Diameter: 18.24mm
Wire Thickness: 1.8mm
Length: 77mm

Ranges Obtained
(These are an average measurement)
Flat: 50ft (15m)
Angled: 75ft (23m)

Price is $8 + $2p/h

I vouch for these springs, i have one in my stampede and they are amazing.

Thank's Servulus I got the 2 Stampede spring in the mail today.

Still have springs for the stampede left if anyone is interested msg me or email me at: lachlan_rex@yahoo.com

Hey mate,

Once I get a chance to trial one in my Stampede, I'll probably be keen for another couple. I'll get back to you over the weekend.

Also, I've posted your clips. Thanks for the prompt payment.

Cheers,

Serv, I will take one spring please. Pick up next war.

Cheers.

Gooni.

Hey mate I heard you have a spring upgrade for the Vulcan?

I dont have any for the vulcan yet.

BUMP

Stampede Springs, Stampede Springs, get yours today!

Serv what ranges are you getting with your stampede? and with what type of darts.

redcricket077 wrote:Serv what ranges are you getting with your stampede? and with what type of darts.

I guess that i could talk for him, as i do have his spring in my stampede.

I am getting 20m+ with this thing @16v

Xoenz wrote:

redcricket077 wrote:Serv what ranges are you getting with your stampede? and with what type of darts.

I guess that i could talk for him, as i do have his spring in my stampede.

I am getting 20m+ with this thing @16v

Looks like I'll be getting some then.

Can I get an update on the spring dudebro?

mister_elliott wrote:Can I get an update on the spring dudebro?

It is on its way, left here last Friday.

Bump

I now have 80 more Stampede Springs

Sent you a pm Serv.

Hey Servulus, thanks for the spring again, however I cannot get the Stampede to fire at all. I have another Stampede with SgNerf's 9kg (if I remember correctly) spring, when I fully charged my four unprotected TrustFire 14500 Li-On batteries, they totalled about 16.3V to 16.4V. The Stampede with SgNerf's spring able to fire, but the other with your spring only moves the plunger forward and stops. When I switched the power off, the plunger moves back with the dart in the chamber. I am assuming due to your stronger spring, the batteries have trouble pushing the plunger back against the spring's resistance. Do you or anyone else have similar experience like this?

Akimbo Assassin wrote:Hey Servulus, thanks for the spring again, however I cannot get the Stampede to fire at all. I have another Stampede with SgNerf's 9kg (if I remember correctly) spring, when I fully charged my four unprotected TrustFire 14500 Li-On batteries, they totalled about 16.3V to 16.4V. The Stampede with SgNerf's spring able to fire, but the other with your spring only moves the plunger forward and stops. When I switched the power off, the plunger moves back with the dart in the chamber. I am assuming due to your stronger spring, the batteries have trouble pushing the plunger back against the spring's resistance. Do you or anyone else have similar experience like this?

I'm now really glad i waited for someone else to find out that lipos don't cut it before shelling out for a set. At the same time i'm keen to hear if there's something going for cheaper than a jaycar SLA batt. Even an alkaline solution would keep me happy since i can get bulk cheap 9v's for my music needs.

Oznerf needs an electrical engineer.

I'm not an electrical engineer, but here goes...

I've run both SgNerf's and Servulus' 13kg springs in my Stampede's, using 4 x 14500's, and haven't had any issues...

Just to add, Lipo's are different to li-ion's too, and are alot more volatile.


Edit: Just performed some minor tests, and results are as follows:

Servulus' spring has a decreased ROF over the BT 9kg spring, but only by about 1 round every 2 seconds, which is to be expected, and is pretty much negligible. It also picks up about 8 feet extra range fired flat from the shoulder. Don't ask me for exact ranges, as I forgot to write them down... It's been a long morning... haha

Range and ROF is virtually identical between Serv's spring, and SgNerf's 13kg spring, except you don't need to mod Serv's spring to fit in the plunger tube, as is sometimes the case with SgN's.

Tests were conducted at 16.4 volts, double washered stingers, and with the same blaster, to try and limit any variable's.

Cheers,

Li-pol's are a few 0.0's of a volt lower than Li-ion's, I think.

Maybe the gears are not aligned correctly?.

And I think serv only runs his pedes on the 12v SLA's.

Gooni.

It does sound like it's bump-firing - maybe the catch back the front, maybe a bad solder joint...

Just suggestions, as I'm not looking for an argument.

Cheers,

Weird.

I have tested the Stampede with Servulus's spring before I have done any mod (meaning still in stock form with stock spring), it fired fine with six D-cells batteries. Once I modded it (usual AR removal, plunger head padded, and of course Servulus's spring in place), it won't fire with those Li-on batteries. Maybe like you guys have suggested some internal components are misaligned, I'll have to open it up again to check. I'll see...

Have you tried the li-ons with the stock spring?

redcricket077 wrote:Have you tried the li-ons with the stock spring?

Not yet, like I've said, I'll have to open it up again to try. I don't think the batteries is the problem because it fires fine in my other Stampede with SgNerf's spring.

Check the small return spring hasn't folded over mate, and that the plunger rod catch is installed the right way around.

I've encountered both of these issues a couple of times when I first started modding Stampede's. It's a fairly simple oversight, and from what I've read, is fairly common also.

Cheers,

If batteries aren't the problem, I see that as a good result. Just check the catch, you've most likely gotten it the wrong way around. It's caught out a few people in this forum.

clunk07 wrote:Check the small return spring hasn't folded over mate, and that the plunger rod catch is installed the right way around.

Thanks for the suggestion Clunk, will definitely check those two when I open it up.

No problems mate, there is a fix for the return spring on the Nerf SG forum's, but I can't for the life of me remember what it was. Hope you get it sorted, as the spring is fairly handy.

I'm hitting approx 68 feet flat from shoulder, and around 84 feet angled from the hip. With a ROF of approx 4 rounds a second, it's good for bulk shits n giggles, if nothing else!!

Cheers,

OK, just checked my Stampede. Internal components seem to be in right place. Return spring not bent and working well. Tried firing stock spring with the Li-on batteries, and it shot well at about 5 rounds per second. Reinstalled Servulus spring and same problem persists, the plunger sounded like it only moved back partly and stopped

Akimbo Assassin wrote:OK, just checked my Stampede. Internal components seem to be in right place. Return spring not bent and working well. Tried firing stock spring with the Li-on batteries, and it shot well at about 5 rounds per second. Reinstalled Servulus spring and same problem persists, the plunger sounded like it only moved back partly and stopped

Are you using 4 li ions like clunk?

It seems that the only issue left is not enough voltage.

I have total of about 16.4V from four of my unprotected TrustFire Li-on 14500 batteries (as I have mentioned earlier), I checked mine with a multimeter. Clunk said he also has 16.4V from his. This is weird...

Quality and age can also affect the batteries. Just because the resting voltage is 16.4V doesn't mean that it'll stay the same when you put them under load. Also, as you draw more current the voltage drops, and I'd wager that in your case the battery voltage is dropping more than in Clunk's case.

Even without protection the Li-ions are going to have some kind of maximum discharge, and I think that this may be a case where the 12V 2.2 Ah SLA is much happier providing those kinds of currents than the Li-ions. The lower voltage of the SLA also means that you're putting less amps through to begin with.

Akimbo Assassin wrote:I have total of about 16.4V from four of my unprotected TrustFire Li-on 14500 batteries (as I have mentioned earlier), I checked mine with a multimeter. Clunk said he also has 16.4V from his. This is weird...

That's the thing with unprotected cells. they "over" charge, and at rest with no load they will read about 4.1-4.2V. as numbers said , once you load the cells, the voltage will drop by a little bit.

I know for a fact that serv only used 12v 2.2Amp SLA with his stampedes (with his springs in them). The only thing I can really think of is that there must be some other issue other than voltage gong on here.

Gooni.

I'd say that the SLA is capable of providing a lot more current than the Li-ions, especially since the Li-ions are only rated at 750 mAh, while the SLA is 2.2 Ah.

Generally Li-ions have a maximum safe discharge rate of 2C, or 1.5 A in this case, and while we're exceeding that limit it's probably a good indication of the maximum discharge rate. The SLA on the other hand should be easily capable of sustaining a current way above that.

Since these are cheap DC motors, voltage and current are proportional to each other (V = IR). As the current goes higher the voltage decreases until you satisfy V = IR. When you use Li-ions the limiting factor is the current, with the SLA it's voltage.

If you can, measure current and voltage for the Li-ion under load. If Servulus or someone else with one of his springs and an SLA can measure the current and voltage under load from that combo as well the results may be interesting. I'd expect that the current and voltage from the Li-ions would actually be lower than that of the SLA, mainly due to their inability to supply high currents.

I'd have to agree with the SLA giving better current etc.

I've tested this spring with both ultrafire/trustfire batt's, as well as good quality AW branded 14500's, and each battery combo works well.

I could only suggest that maybe one or two of the batt's aren't discharging properly. Generally, when I charge the batt's, they combine to around 16.7v. The sets I used yesterday had already been used a couple of times, hence the resting 16.4v.

I have both li-ions and SLA, but I haven't charged the SLA yet for testing. I've stuck with the li-ion's due to not having to butcher the battery sled for the SLA to fit, the modularity and ease of the 14500's, plus the decrease in weight.

It all boils down to personal preference.

All I could suggest is another set of batt's, and go from there. The problem with the Ultra/trustfire's is that they're el cheapo's, but that's where price vs quality comes in to play.
For example, I pay around $2.20 ea for the cheaper batt's, and around $6 ea for the AW's. I only use the AW's in my rigs, but people tend to buy the cheaper batt's from me. Obviously, disposable income plays a huge part.

Hope you get it sorted Akimbo.

Cheers,