Crt.5 brushless overheating - Page 2 - RC-Monster Forums

BrianG · 07.01.2009, 07:40 PM

Wow, I see.

Well, I'm not sure about what cap you are wanting to add.

Do you mean a "glitchbuster" cap to help the BEC cope? If so, that won't work; all it will do is help even the load (smooth out the current spikes). And with tires that big, there is quite a load on the steering servo and BEC. Plain and simple: you need a switching one.

Or, do you mean extra caps on the power lead to augment the existing 3 caps on the ESC? If so, that may help (certainly won't hurt), but I wouldn't expect miracles.

I think your best bet would be to get a UBEC and possibly gear down a tooth or two. A 2700kv motor on 3s is only ~29k rpm, which a bit on the slow side. The ESC may simply be pulling a decent amount of current to retain 35mph speeds. With that motor and tire size, I'd go 4s and gear to 11T or 12T on the pinion. But at 4s, a UBEC is required.

Jason · 07.02.2009, 07:06 AM

Yes I talk about a extra cap 1200UF/35V

Jason · 07.02.2009, 07:09 AM

what happened if I used heavier diff fluid on the rear diff then the front diff ?

Jason · 07.02.2009, 12:43 PM

http://richtechparts.com/i-2564-1200UF_35V.html

do you think these one are low ESR ?

BrianG · 07.02.2009, 12:55 PM

Probably. The 105*C temperature rating is usually low-ESR. The regular style caps are usually rated for 85*C.

Jason · 07.02.2009, 06:25 PM

ok good!

Jason · 07:55 PM

it is possible my 4.72inch tires with the balloning factor goes up to 6inch ? and the speed at 4.72inch are 33.67 mph (54.08 km/h) and with the ballooning the speed goes up to 51.93 mph (83.41 km/h) ...

Metallover · 07.05.2009, 04:02 PM

Quote:

Originally Posted by Jason

it is possible my 4.72inch tires with the balloning factor goes up to 6inch ? and the speed at 4.72inch are 33.67 mph (54.08 km/h) and with the ballooning the speed goes up to 51.93 mph (83.41 km/h) ...

Could very well be.

Jason · 07.07.2009, 01:23 PM

im back from playing with the crt.5 and I have strapped the GPS the top speed was 39.37 mph (63.25 km/h) the runtime with a 3s 6400mah was 32 minutes I runned 13.2km ( kilometers ) in total.. the outside temp was 13°c ( 55f ) and at the end of the run the motor was 95f and the speed 95f too no body in it and bec disabled ...

Jason · 07.07.2009, 02:24 PM

anyone can diagnostic my amps draw from this info ?

and for my rx pack I used 425mah for 32minutes of runtime

so with a bec or not it wont really affect the runtime on the main battery I think ... maybe only around 2 minutes ?

Arct1k · 02:28 PM

rx 425/32*60=800mah = 0.8amps

Bat = 6400/32 *60= 12 amps