RE: What to get? Sidewinder or Mamba Max.  
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RE: What to get? Sidewinder or Mamba Max. - 7/1/2008 4:51:12 PM   
Chris_RC



Posts: 2618
Joined: 11/19/2005
From: La Quinta, CA, USA
Status: offline 		you don't have to change the spur, just the pinion. Drop 2-3 maybe. Lipo is short for lipoly which is short for lithienum. (i think i spelled it wrong) It has more power than nimh but if you dont treat it carefully it will blow up in flames. A123 cells can charge in 15 minutes, dont blow up in flames, and last over 1000+ charges. Look at A123 cells at a123racing.com.

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RE: What to get? Sidewinder or Mamba Max. - 7/1/2008 5:55:31 PM   
Caaine


 

Posts: 40
Joined: 7/1/2008
From: Reykjavík, ICELAND
Status: offline 		Thanks for the replies,

Li-poly got me on the right track (http://en.wikipedia.org/wiki/Lithium_ion_polymer_battery).

If I am gonna do basic bashing, top speed not the concern rather runtime am I better off with a 4600Kv SW and 3s or is there a huge difference by running the 5700Kv SW and I should sacrifice runtime with 2s? There is very little price difference in the 4600 and 5700 SW, I assume it differs on the batteries and/or chargers then?

EDIT: I was looking on the a123racing.com website and was wondering what battery fits the e-Firestorm. Also, could I purchase the batteries and charger now and use with the stock car (would assume I need a new ESC but the sales pitch at their website is convincing)?

Rgds,
Caaine

< Message edited by Caaine -- 7/1/2008 6:26:25 PM >

(in reply to Chris_RC)
       Post #: 27

RE: What to get? Sidewinder or Mamba Max. - 7/1/2008 6:19:39 PM   
R/C fan-addict



Posts: 3585
Joined: 12/4/2005
From: Belmont, MA, USA
Status: offline
quote:

ORIGINAL: Caaine

Thanks for the replies,

Li-poly got me on the right track (http://en.wikipedia.org/wiki/Lithium_ion_polymer_battery).

If I am gonna do basic bashing, top speed not the concern rather runtime am I better off with a 4600Kv SW and 3s or is there a huge difference by running the 5700Kv SW and I should sacrifice runtime with 2s? There is very little price difference in the 4600 and 5700 SW, I assume it differs on the batteries and/or chargers then?

Rgds,
Caaine


For basic bashing I would go for the SW 5700 and a 2s lipo. 2s versus 3s has nothing to do with runtime. It is simply the voltage. One has 2 cells, where each cell supplies 3.7 volts, the other has 3 cells where each supplies 3.7 volts. So one pack can give 7.4V while the other gives 11.1V. The higher the voltage the better the performance the motor will give. However if you want to run 3s on the 5700 you'll have to buy first of all, a more expensive battery, then the more expensive mamba max ESC, and then the performance might be too much for a light truck like yours. I think you'd be best off with the 5700 motor, sidewinder ESC, and a 2s lipo. That setup would be a good amount of speed and the price is too bad compared to other systems. Good luck

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(in reply to Caaine)
       Post #: 28

RE: What to get? Sidewinder or Mamba Max. - 7/1/2008 6:22:12 PM   
Chris_RC



Posts: 2618
Joined: 11/19/2005
From: La Quinta, CA, USA
Status: offline 		does anyone know if the Sidewinder 5700 can handle 9.9 volts? Because that is the voltage of a 3c a123 pack.

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       Post #: 29

RE: What to get? Sidewinder or Mamba Max. - 7/1/2008 6:32:36 PM   
Caaine


 

Posts: 40
Joined: 7/1/2008
From: Reykjavík, ICELAND
Status: offline 		Excellent reply,

So 5700 SW, ESC combo and 2s batteries it is. What battery from the a123 website should I purchase?

Hypersonic 2300 6.6V or Hypersonic 4600 6.6V - do they both fit the e-Firestorm?
Do I need to think about LiPO cut-off or is that not required with this setup?

On another note:
Repasted from EDIT in earlier post before replies: I was looking on the a123racing.com website and was wondering what battery fits the e-Firestorm. Also, could I purchase the batteries and charger now and use with the stock car (would assume I need a new ESC but the sales pitch at their website is convincing)?

(in reply to R/C fan-addict)
       Post #: 30

RE: What to get? Sidewinder or Mamba Max. - 7/1/2008 7:30:04 PM   
mog ruith


 

Posts: 217
Joined: 12/9/2007
From: city of god, NORWAY
Status: offline 		im wanting to try out a123 cells with my mm but im confused on how the set up should be
anyone here can explain how it goes about??
read on a123racing.com that the packs has only 6.6v on a 2s2p how fast is that??
cos nimh is 7.2v and 2s lipo are usually 7.4v

(in reply to Caaine)
       Post #: 31

RE: What to get? Sidewinder or Mamba Max. - 7/1/2008 10:18:12 PM   
Caaine


 

Posts: 40
Joined: 7/1/2008
From: Reykjavík, ICELAND
Status: offline 		I have the same question as the above poster, was gonna go purchase the 6.6V 4600Mah A123 battery and charger but then noticed that my current battery is 7,2V 1500Mah. It´s my understanding that you get more power as the voltage goes up and more endurance the higher tha Mah. Is it as powerful due to it´s a different technology or will I get less power from this thing unless I swap to brushless motor?

A rookie trying to figure this out ...

EDIT: Did some digging and it appears as long as the car handles 6,6V (which I am still investigating) the p=u*i rule applies: power=voltage*mah. That would make the 6,6 4600Mah battery an excellent battery choice.

Rgds,
Caaine

< Message edited by Caaine -- 7/1/2008 10:44:10 PM >

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       Post #: 32

RE: What to get? Sidewinder or Mamba Max. - 7/1/2008 10:43:52 PM   
clamber


 

Posts: 435
Joined: 6/5/2008
From: tooele, UT, USA
Status: offline 		Just get a maxamps battery! Thats what Id do.

(in reply to Caaine)
       Post #: 33

RE: What to get? Sidewinder or Mamba Max. - 7/1/2008 11:17:07 PM   
Access


 

Posts: 2617
Joined: 3/8/2005
From: , CA, USA
Status: online
quote:

ORIGINAL: Caaine
EDIT: Did some digging and it appears as long as the car handles 6,6V (which I am still investigating) the p=u*i rule applies: power=voltage*mah. That would make the 6,6 4600Mah battery an excellent battery choice.

Rgds,
Caaine

The problem with 6.6V is it is real close to 5V. If the voltage drops even a little bit (below ~5.5V) you risk the BEC dropping below 5V, which can kill your receiver, hence the 'stuttering' that is a common problem under power with the high-power brushless setups. 9.9V would give you a better margin there, if you are going with A123 cells maybe use a 9.9V and a 4600KV motor, would give you about the same power as a 6.6V and a 5700KV motor. Even if your receiver does not drop out, your servos won't be getting the 5V they desire so they could get weaker (or stop altogether) during periods of high power use.

< Message edited by Access -- 7/1/2008 11:18:21 PM >

(in reply to Caaine)
       Post #: 34

RE: What to get? Sidewinder or Mamba Max. - 7/2/2008 12:01:35 AM   
ozium


 

Posts: 318
Joined: 1/2/2008
From: los angeles, CA, USA
Status: offline
quote:

ORIGINAL: IloveMYxt2

Why not just get a 3s lipo in the near future? If your going all out with a MM 7700, then do it right.



You can't run a 3s lipo on a 7700kv, it's too many RPM's. Castle says 2s max on a MM 7700kv motor.

People have been running them for short periods but I've heard a few people say their motors have disintegrated.

(in reply to IloveMYxt2)
       Post #: 35

RE: What to get? Sidewinder or Mamba Max. - 7/2/2008 12:29:55 AM   
Access


 

Posts: 2617
Joined: 3/8/2005
From: , CA, USA
Status: online
quote:

ORIGINAL: ozium


quote:

ORIGINAL: IloveMYxt2

Why not just get a 3s lipo in the near future? If your going all out with a MM 7700, then do it right.



You can't run a 3s lipo on a 7700kv, it's too many RPM's. Castle says 2s max on a MM 7700kv motor.

People have been running them for short periods but I've heard a few people say their motors have disintegrated.

See the above post.
http://www.rcuniverse.com/forum/m_7608551/anchors_7608551/mpage_1/key_AUVSI/anchor/tm.htm#7608551
It should actually be okay, but you have to make sure you get one of the recent ones ie. a motor manufactured within the last 3 months or so. The only way to gaurantee that is to order direct as they can sit on retail shelves (or in a distributors warehouse) for some time. They recently made some changes to the CM36 motors, improved efficiency (should run cooler) and rotors that should handle 85,000rpm or more. Patrick del Castillo was one of the guys manning the castle booth at the show, so I figure he knows best.

Also if you want the real / actual specs for their controllers, go to:
http://www.castlespecialprojects.com/
click on the link below, "reversing controllers".
RCU has a nasty habit of mangling the links in posts.

< Message edited by Access -- 7/2/2008 12:36:08 AM >

(in reply to ozium)
       Post #: 36

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