The only way that a higher C battery will blow an ESC when a lower C pack didn't is when the motor wants more juice than the battery can supply, and the amount it wants is enough to blow the ESC. When you give it a battery that can supply that amount of power the ESC can't take it.
On the other hand, your batteries aren't going to last long at all if the motor is constantly trying to draw more current than they can deliver, AND it can also blow an ESC with the ripple currents.
The ESC should be able to handle more amps than the motor will want, and the batteries should be happy delivering more amps than the ESC can handle, that way everything is happy running together.
As for needing a 60a esc in something this small, thats overkill unless you're way over propped on a high kv motor.
Light travels faster than sound, so people may appear to be bright until you hear them speak.
Maiden voyage today in the canal, I ran a 2200mAh 25c pack and the boat is a screamer, thanks Jim! It also self righted twice (hatch was taped, but I haven't put foam in yet). No videos as I didn't have a helper. (edit)-Jim, what would you do to improve top end performance of the boat? Thanks. :)
Decals arrived today too. :D
Last edited by Phaleronic; 07-01-2011 at 01:35 AM.
Good to hear she's running good for you! I'm surprised it self-righted as the cat really isn't designed to do that like the Velocity Mono will.
Mini Cat Racing USA
www.minicatracingusa.com
That's right, if a motor is only pulling 25a through a 30a esc, it does not metter if you use a better and higher c rated batter... it won't blow
If the esc does blow, something is up and it has nothing to do with higher c rated packs...
.NAMBA20...Caterpillar UL-1, P-Spec OM29, P-Mono DF33, P-Spec JAE, Aussie 33" Hydro-LSH, Sprintcat CC2028 on 8s, PT SS45 Q Hydro, PS295 UL-1 power, OSE Brothers Outlaw QMono 4-sale, Rio 51z CC2028 on 8s
Ah Jeeeez! One more time. The initial surge out of the higher C rated packs blow the FETs in the original 30A Tenshocks. Forget it, I'm tired of arguing about it. The FACT is it happens. I don't give a rat's behind why!
Mini Cat Racing USA
www.minicatracingusa.com
initial surge?????
like you said, the motor will only pull what it needs, you wont have a HUGE sure if the motor does not need it!!
if it's only pulling 25amps then that's all it's pulling
lots of esc's out there that handle way more amps than what is posted on them and they can take High C rated packs without any issues at all
Ah Jeeeez! sounds more like junk caps than anything else
.NAMBA20...Caterpillar UL-1, P-Spec OM29, P-Mono DF33, P-Spec JAE, Aussie 33" Hydro-LSH, Sprintcat CC2028 on 8s, PT SS45 Q Hydro, PS295 UL-1 power, OSE Brothers Outlaw QMono 4-sale, Rio 51z CC2028 on 8s
First video:
http://www.flickr.com/photos/valtoninc/5893355838/
Look, I try to be honest with my customers by telling them that anything above 25C will blow the esc. Junk caps, bad FET's, whatever! We have now fixed the problem. Give it up!
Mini Cat Racing USA
www.minicatracingusa.com
Mini Cat Racing USA
www.minicatracingusa.com
F.Y.I. we have ONE Velocity Cat left in stock at the sale price of $209. We will NOT get any more like this. The boat has been redesigned. Not as cool looking but supposed to be faster/more stabile. I can't imagine how. WE shall see! We probably will not have those in stock until Late August, early September.
Mini Cat Racing USA
www.minicatracingusa.com
I will post a video of my little v-Cat when I get the drive line issues sorted (self created).
I will say.. It is fast. Mine is almost too fast.
I am running the following:
ESC 120 amp
Stock 3000kv 2 pole motor (no heat issues)
6S 45-60c 1350 mah
stock prop
Best speed on radar was 64 mph (no where near WOT), next pass i twisted the stock drive line when I went WOT at 55mph. It held for 3 days of test/ tune / play.
Video coming soon.
Due to my addiction i also picked up the last Samurai. I will tinker with it and see what come up. Im thinking 12S and a hydra HV 240.........
You're revving that stock motor to about 65k rpm? The 120a esc is probably overkill since your battery can only give 60a happily.
Light travels faster than sound, so people may appear to be bright until you hear them speak.
I agree in it being over kill, but it was on shelf here in the shed so it went in. Better wet than collecting dust I say!
And yes 66,600 free rpm.
You will blow the Samurai motor in less than a minute if you try to run it on 12S. No warranty on anything over 4S on that motor. I still can't believe the velocity motor has held up at 6S.
I forgot to enclose the instructions with your Samurai. You can download them here:
http://minicatracingusa.com/images/i...aiinstruct.pdf
Mini Cat Racing USA
www.minicatracingusa.com
We are down to two Velocity Cats. They are being discontinued. We will continue to have parts for them.
A new series of small cat and mono will be coming in later this summer. Totally new designs. They will be the "Dominator" series.
Also a new mono, the "Flash V-28", will be added later this summer. 24" (hull length) 28" including rudder, etc.
Stay tuned for news!
Mini Cat Racing USA
www.minicatracingusa.com
keep me posted, Im working on a collection. :)
Sailr, I have to smile over here, I have seen you having this same conversation over and over on the amp/c rating issue. Seems like no one seems to want to believe you...even though you have been selling the boats for years now and know exactly what works and does not work. Keep up the patience. Maybe you just gather all the other links that are just like this one and post them for those who are new to the boat. Best of luck....kinda like the movie Groundhog Day...
Haha. Thanks. Yeah, everybody but me knows everything. Oh well!
Mini Cat Racing USA
www.minicatracingusa.com
Thats how it goes man, lol Wife just called said I have a box from Florida at the house.....
Wonder what it could be.... :)
sailr what would you recommend as a motor upgrade? i will be running min 6s 2p. But they are tiny 1350 mah so they are only a couple of oz heaver than my zippy 3s 2500mah pacs. Im not looking for run time, i want all out drag speed. Will be running it on 3s 2p in parallel at first light with my hk 120a esc.
6S may burn up the original motor but not sure. Never tried it. Not sure what to recommend. I don't think a NEU 1515/1Y will fit in the boat. Maybe try one of the Leopard motors of similar physical size as the original motor. With your setup you're only going to have 2700mAh! Whatever you put in the boat will probably be drawing around 100A as it is a submerged prop. Hope you don't want to run long! That setup will give you about 1.6 minutes. You'll need at LEAST 40C packs to be able to deliver 108A continuous.
Mini Cat Racing USA
www.minicatracingusa.com
Looks like I stirred up a hornets' nest. :P
I'm really digging the boat Jim, thanks again! I would like a bit more topend on the cat, what do you recommend? I'm still running the 3s 2200mAh packs. I did put some decals on the boat, but I will need to redo them since they're off and I didn't have my good knife to cut them with.
The boats are designed around certain parameters including how many cells, prop, etc. We have never tried to hop one up as they run great right out of the box! Have you tried moving the battery back just slightly, like 1/4-1/2"? That will bring the bow up and possibly give you more speed but it could also cause it to get airborne and flip more easily. I really can't recommend anything else. 35-40mph is pretty fast for 17"!
Mini Cat Racing USA
www.minicatracingusa.com
Moving the pack back a half inch didn't do much. Anyone try different props on this boat?
It's that time of season again. :)
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