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Overspin Issue, Possibly

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Old January 18th, 2011, 15:27   #1
iKliiu
 
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Overspin Issue, Possibly

My gun is double feeding consistently, and I ruled out the fact of the hop up creating issues. I think it's a overspin because when the battery has low power, it feeds properly. I am using a 7.4v 25C LiPo, on roughly a M110 spring and a stock motor. What can I do to fix this? A motor with more torque? I'd like to keep my LiPo, but if not, what would be the cheapest solution?
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Old January 18th, 2011, 15:33   #2
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turn the hop up down maybe?
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Old January 18th, 2011, 15:47   #3
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He's probably talking about motor overspin which has nothing to do with the hopup. Motor or gear change would be your best bet.
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Old January 18th, 2011, 16:24   #4
Rooster
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Put in an 11.1v lipo and get a 3 round burst option? lol

Seriously though, I'm not sure what the best solution is, but mine does something similar. It goes 1 1/2 rounds per shot with a 9.6v on semi..
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Old January 18th, 2011, 16:41   #5
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Why not just get a lower powered battery? 25C is overkill. 12C is more than enough for your application.
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Old January 18th, 2011, 17:49   #6
iKliiu
 
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What battery or motor would you recommend? I'm trying to keep the cost low.
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Old January 18th, 2011, 17:59   #7
ILLusion
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Your cheapest option in getting this corrected, is just to buy a smaller battery. It may not seem intuitive to some, but the "C" rating does affect the ROF. The lower the C value, the greater the internal resistance in the pack, and thus, the final current output from the pack is restricted. That means, lower ROF.

It's well known that a 7.4v battery will react very much like a 9.6v NiCad battery, so take this in to great consideration when picking the other attributes of the pack, such as max amperage rating, as well as the capacity. The lower the two latter numbers, the slower the battery will be.

The voltage rating is NOT the only characteristic that affects rate of fire. In a "perfect" world, Ohm would be God, and his law would be in the bible with no other characteristics in the mix. Unfortunately, in the real world, there are other factors which contribute to the final result.

This applies to batteries of all chemistries, not just Li-Po.

Try finding a 7.4v 10C or 12C battery with a capacity no higher than 1500mAh if you must absolutely use Li-Po. Otherwise, consider these other options:
1) Installing a voltage control circuit such as the Trigger Master
2) Torquing up the gears to prevent energy build up in the motor (which will also help to reduce overespin.)

Last edited by ILLusion; January 18th, 2011 at 18:01..
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Old January 18th, 2011, 18:04   #8
iKliiu
 
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What about just NiMH type batteries? Also, will getting a torque up motor fix the issue also?
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Old January 18th, 2011, 19:24   #9
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Quote:
Originally Posted by iKliiu View Post
What about just NiMH type batteries? Also, will getting a torque up motor fix the issue also?
Yes. NiMh batteries would solve the problem.

A high torque motor might help but the trigger master mosfet or the ASCU would work wonders here.
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Old January 18th, 2011, 19:51   #10
audi_bhoy
 
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I had the same issue, installed a ASCU and it worked fine! (Systema gearbox + JG M-93 motor)
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Old January 18th, 2011, 20:12   #11
iKliiu
 
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Another question, my gearbox used to be not able to spin on a 8.4 NiMH mini; thats why I got the LiPo. The battery just might've have been crap, but I'm afraid if I do get a NiMH battery, it won't be able to spin again.
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Old January 18th, 2011, 20:16   #12
coach
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Quote:
Originally Posted by iKliiu View Post
Another question, my gearbox used to be not able to spin on a 8.4 NiMH mini; thats why I got the LiPo. The battery just might've have been crap, but I'm afraid if I do get a NiMH battery, it won't be able to spin again.
an 8.4 mini on an m110? have you checked the shimming? can you fit a large battery?

maybe try and borrow a friends 9.6 nimh before you buy.
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Old January 18th, 2011, 21:47   #13
iKliiu
 
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I think it was just a crappy battery, would these batteries do?
http://cgi.ebay.ca/9-6V-NiMH-2800mAh...item2a0a75e61e
http://cgi.ebay.ca/9-6V-2000mAh-Nunc...DLVI%26ps%3D63
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Old January 19th, 2011, 10:58   #14
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Quote:
Originally Posted by iKliiu View Post
What about just NiMH type batteries? Also, will getting a torque up motor fix the issue also?
Yes, that would definitely help with the problem. I was under the assumption that you could *only* use Lipo's due to space restrictions, but looking again at the size of the pack you're using, it's definitely not that. It sounds like a pretty hefty battery. LOL.

A torque up motor *might* make the issue a bit better, but it could also make it worse, as upgraded motors usually have an even higher rate of fire.

Get a smaller battery!

A crappy 8.4v NiMH mini is definitely too small to crank an M110 spring. You'd need at least torque up gears to get that working with crappy cells.
You'd at least need very good quality and high capacity cells if you had to go with a mini pack (ie, 1600mAh 2/3A).
Also, Ni-Cad can achieve higher maximum current dumps than Ni-MH cells can, so if minis are your only option, I'd pick Ni-Cad over Ni-MH, even if Ni-Cad 2/3A cells only have a maximum size of 600mAh.

As for those ebay batteries you linked, either of those should work, but I'd probably go with the Nunchuk batteries before the large cell pack, as they're made from a known cell manufacturer (Intellect) rather than from some random unknown brand ("Huosuli"? Never heard of it)

Last edited by ILLusion; January 19th, 2011 at 11:02..
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Old January 22nd, 2011, 11:45   #15
iKliiu
 
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Ok, I think I will go with the nunchuck battery, but will it fit in a crane stock?
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