Can and will shorter wires reduce temperature of the batteries?

[boilo56]

I run on x442, grimracer 42x55, and x440/3 mostly. I use the x442/3 sometimes, but this one is very taxing the electronic.

[Jamey]

Hmm. I would expect differences in final voltage and temperature between those first three props you listed. Either way I think these should be in the ball park for a pretty conservative setup. Do you still have the stock pursuit prop you could try? It is a really easy prop to turn. If those batteries get hot with the stock prop and only a 3 minute run time you may have to consider larger batteries (or heaven forbid a lower kv motor lol).

[boilo56]

Hmm. I would expect differences in final voltage and temperature between those first three props you listed. Either way I think these should be in the ball park for a pretty conservative setup. Do you still have the stock pursuit prop you could try? It is a really easy prop to turn. If those batteries get hot with the stock prop and only a 3 minute run time you may have to consider larger batteries (or heaven forbid a lower kv motor lol).

I have the stock prop. Sure it is easy to turn, but speed is pretty lower also. May be i should try running 4 batteries and see?!

[Jamey]

I don't know, if you give it plenty of rpm, which your setup would do, I think the stock prop will still give some good speed. Can't hurt to try it.

4 batteries will definitely run cooler just don't get confused on the wiring lol. You want to run 4S2P not 8S1p!!

[boilo56]

Yes, the wiring will need good attention! I did try the stock prop on my setup. It only gets me in the low-mid 40mph. The X442 gets me around 52 mph.

[boilo56]

I tested the 4 batteries setup today. All the batteries, the motor and ESC were relatively cool(+/-95*F). But now only the ESC-to-motor wires gets hot ... Hot enough to melt the floating material i put in the canopy when they get in contact with it. Do you think i should also shorten those wires?

[srislash]

That has to be the motor efficiency. Is it a 36mm can or 40? I run a Castle 1515 in my Pursuit (445/2 blade)which is a 4074 can and have no issues. Bear in mind those cheapy HK motors must be cheaper for a reason. Glad the amps on tap cleaned up the rest though.

Another thing, maybe check your flex and add a few drips of oil of some sort to the grease. This will free it up.

[boilo56]

That has to be the motor efficiency. Is it a 36mm can or 40? I run a Castle 1515 in my Pursuit (445/2 blade)which is a 4074 can and have no issues. Bear in mind those cheapy HK motors must be cheaper for a reason. Glad the amps on tap cleaned up the rest though.

Another thing, maybe check your flex and add a few drips of oil of some sort to the grease. This will free it up.

The motor is a 39 mm can 3974-2200 kv. How long are your run times. I run for about 2:30 min to 3:00 min per 5000 mah pack. Also, i keep the flex greased at least once per day of running. Do you suggest to mix the grease with oil of some sort?

[srislash]

Yeah I have found a couple drips of oil into the top of the flex really helped my top speed. So it must 'free things up'. Worth a shot for you anyway. I use Duralube which is an additive like Slick50 but I think any light oil would help.

[boilo56]

Yeah I have found a couple drips of oil into the top of the flex really helped my top speed. So it must 'free things up'. Worth a shot for you anyway. I use Duralube which is an additive like Slick50 but I think any light oil would help.

What oil weight is that? Thick? liquid? I was thinking of a cocktail of silicon oil, or bearing oil... Would it work?

[srislash]

I would say bearing oil, perhaps the silicone. I find it mixes with the grease so the thickness comes from that

[Maximus]

Only one thing makes stuff hot. Your running too much prop period.

[boilo56]

I went ahead, and i removed 3" on each three wires from the motor-to-ESC side.IMG_20150727_121019.jpgIMG_20150727_121138.jpg I'll test and report back later today.

Cheer!

[tlandauer]

Looks very good, any unnecessary length should be chopped off if possible. Please note that on many brushless motors, you really can't cut the wires as the lacquer on the wire will need to be grind off , otherwise you can't tint and solder. So ALWAYS check before you do it. We cut the ESC wires most of the time.
To check if you can cut the motor wires, if the wires are stiff, then no, because they are extensions from the stator windings. Castle Creations' motors use regular high grade silicone insulated electrical wires and they SPECIFICALLY say you may shorten the wires.
I am saying this only for your future heads up as I know you did everything right. Congrats.

[tlandauer]

Only one thing makes stuff hot. Your running too much prop period.

You may be right to a large extent, but a general comment like that is simplifying the matter. I am not criticizing your answer, but I do feel that prop selection is but one of the factors that can contribute heat.