6.5mm vs 8mm Bullets

[PlayerUnknown069]

I am currently setting up my OM Carbon Dominator aka DYMotorShop mono hull and have a question about connectors.

Going 6s 5200mah 125C maybe 9500mah if I?m risky with the weight and because I have them.

ZTW Seal 200 amp 6D
TP Power 4060 1950kv
Max Amps (A): 192
Max Volt (V): 30.3
Continuous Power (W): 2350
Max Power (W): 5000

I have a set of Castle 6.5mm bullets and Castle 8mm bullets. Honestly, 8mm bullets on 10awg wire seems a little overkill to me? I will have to copper wrap the wire to fill some of the gap.

All my batteries have EC5 and I was thinking of switching to Castle 6.5mm polarized? Switching to 8mm connectors is a pain.

What do you all recommend I should go with?

[Capt. Crunch]

Castle https://www.castlecreations.com/en/cc-bullets-6-5mm says they're good for 200A, I'd go ahead & use them.
Yes 8 mm is a bit overkill unless u go to 300+A, Although math says 400A!!

I use 6mm & go to 150A no problems.

[PlayerUnknown069]

Thank you! Anyone else on here?

[Bande1]

Im about as newb as possible but I just put 8mm on my 150a flycolor for my first ever build. I figured the bigger the better. I just filled them with solder and dipped the 10awg wire in.

[TRUCKPULL]

6S on a 1950KV motor = 45,600 RPM =

Larry
PS 1950 KV is a very good 4S setup.

[PlayerUnknown069]

6S on a 1950KV motor = 45,600 RPM =

Larry
PS 1950 KV is a very good 4S setup.

Calculator has me at 38k under loaded on 6s which is just over the 35k recommended max RPM. I?ll be running conservative 42mm - 45mm props for small ovals. I don?t push the ESC riding on full throttle for a full battery. It?s just short straights before getting into the turns. Besides, even ProBoat has a 1900kv in the Sonicwake running on 6S with poor cooling to say the least. All on a 120 amp ESC.

I could test with 4s and see how it does then go from there. Thank you!

I have seen a Zonda Cat guy run two TP 1950kv on the stock Seaking 120 amps. Shocked it didn?t burn up but it?s possible if you don?t care enough 😅.

[TRUCKPULL]

A fully charged cell is 4.2V
Under load lets say 3.9V
3.9 X 6 = 23.4 volts
23.4v X 1950kv = 45,600 RPM

Larry

[PlayerUnknown069]

A fully charged cell is 4.2V
Under load lets say 3.9V
3.9 X 6 = 23.4 volts
23.4v X 1950kv = 45,600 RPM

Larry

I was using this https://www.offshoreelectrics.com/conversion.php

[TRUCKPULL]

I have only been doing this for 25 years.
Go ahead and do it your way, after you burn a few things up like the rest of us did when we started out,
you may start paying attention.
1950 KV is a 4S motor in a Mono.

LARRY

[PlayerUnknown069]

I have only been doing this for 25 years.
Go ahead and do it your way, after you burn a few things up like the rest of us did when we started out,
you may start paying attention.
1950 KV is a 4S motor in a Mono.

LARRY

Jump off your high horse you little firecracker, I don?t want you all upset now. I never disagreed or said you were wrong. I am simply sharing with you the OSE calculator I was using and what it says when you put in the values as described. In that case, you should take all this negative energy and contact OSE about it.

[photohoward1]

I?m with Larry. But you know you don?t have to run 4s or 6s you can run 5S. Everyone always thinks you have to run an even amount of cells you can run odd number amounts too. I have some boats that I run 5S.7s and 9s.

Just some food for thought. And I got five years on Larry.


Sent from my iPhone using Tapatalk

[PlayerUnknown069]

I?m with Larry. But you know you don?t have to run 4s or 6s you can run 5S. Everyone always thinks you have to run an even amount of cells you can run odd number amounts too. I have some boats that I run 5S.7s and 9s.

Just some food for thought. And I got five years on Larry.


Sent from my iPhone using Tapatalk

Yeah 5s could be an options. Considering I have a lot of 6s single packs, at this point I am considering selling or trading my 1950kv for something lower kv.

Thanks for the help!

[TRUCKPULL]

If you do run it on 4S, I would recommend an ABC -1915 - 17 - 2 prop.

Larry

[PlayerUnknown069]

If you do run it on 4S, I would recommend an ABC -1915 - 17 - 2 prop.

Larry

Larry, can you share a link? I can?t seem to find one.

[TRUCKPULL]

https://www.offshoreelectrics.com/pr...7-45%282%29CLL

1915 - 17 - 45 - (2) CLL
For a finished, sharpened, Balanced, and hardened, prop.
get ahold of (Dasboata) here;
https://forums.offshoreelectrics.com...dasboata+props

Larry

[PlayerUnknown069]

https://www.offshoreelectrics.com/pr...7-45%282%29CLL

1915 - 17 - 45 - (2) CLL
For a finished, sharpened, Balanced, and hardened, prop.
get ahold of (Dasboata) here;
https://forums.offshoreelectrics.com...dasboata+props

Larry

Thanks! I actually have a Dasboata 3 blade prop that got me in the 70?s.

I didn?t think of that, thank you!

[larryrose11]

Monos have a lot of drag in comparison to other hulls.
That drag translates into more torque in the system for the same speed.
That is extra amp draw, which burns parts up.
The KV selected for a mono is typically more conservative.
Props selection typically use a 1.4 pitch, and a larger diameter.
There is also the effect of prop cavitation at higher RPM.
Props seem to do better below 38K on riggers, lower still on monos (not my specialty)

[PlayerUnknown069]

Larry,

On the ZTW 200amp there is no data log so I can?t monitor the ripple voltage. Do you recommend running a cap pack with the ZTW considering boats have higher amp draw?

My experience is more with speed run cars and it doesn?t become necessary with the right gearing unless you are drag racing or getting into 130mph plus speeds.

[TRUCKPULL]

Sorry - I do not have any experience with ZTW ESC's.
I would say - give it a try first. If the caps run hot, add some more.

Larry

[koen]

i use ZTW 200 in a mhz phantom with a tp4070 1400kv on 8s and no problem ,the caps are in the cooling circuit so they never get hot the highest temp i measured was 40c with a 5016/3 prop

[PlayerUnknown069]

i use ZTW 200 in a mhz phantom with a tp4070 1400kv on 8s and no problem ,the caps are in the cooling circuit so they never get hot the highest temp i measured was 40c with a 5016/3 prop

Thank you! I ordered a cap pack just in case but hoping to not use it.

[PlayerUnknown069]

I have some cooling questions, hoping some of you experts can chime in.

I have never plumbed in the motor water cooling plate. I always cool the ESC and motor jacket on separate loops.

Is it worth plumbing in a new pickup and outlet for the motor plate?? I do not want to waste my time on a 1 degree difference.

[TRUCKPULL]

Is this the motor plate that you are talking about.
https://www.offshoreelectrics.com/pr...od=ose-80230-b

If so, most people do not connect cooling to it, it has too much restriction in it.

Larry

[PlayerUnknown069]

Is this the motor plate that you are talking about.
https://www.offshoreelectrics.com/pr...od=ose-80230-b

If so, most people do not connect cooling to it, it has too much restriction in it.

Larry

Larry, yes that?s the one but with the rear mounting ring.

Yeah I see most dont use it. I would run it on its own loop and not restrict my water jacket or esc. But, is it worth the trouble, drilling a carbon hull?.seems like a no?

[TRUCKPULL]

NO!

Larry

[Bande1]

Is this the motor plate that you are talking about.
https://www.offshoreelectrics.com/pr...od=ose-80230-b

If so, most people do not connect cooling to it, it has too much restriction in it.

Larry

is cooling more efficient if its necked down giving more time for heat transfer?

[jaike5]

Heat travels to cold. So the colder the surface, the faster the heat transfers.
J.

[Capt. Crunch]

You're going to get the greatest heat trans fer with more water running thru the cooling jacket/esc.
Heat transfer is dependant on the difference in temps between the hot side & cold side, more water means it keeps the flow going at a higher rate so water only heats up a little while in the jacket.
Best is too have 2 circuits, one for each device.

The cooling blocks are a hold over from dc motors that the brushes create the heat & need to be cooled. The brushes are at the end that goes against the holding block, this gets the most heat away from the brushes.

[fweasel]

is cooling more efficient if its necked down giving more time for heat transfer?

Not in an open loop system. Flow is your friend.

[PlayerUnknown069]

You're going to get the greatest heat trans fer with more water running thru the cooling jacket/esc.
Heat transfer is dependant on the difference in temps between the hot side & cold side, more water means it keeps the flow going at a higher rate so water only heats up a little while in the jacket.
Best is too have 2 circuits, one for each device.

The cooling blocks are a hold over from dc motors that the brushes create the heat & need to be cooled. The brushes are at the end that goes against the holding block, this gets the most heat away from the brushes.

Makes sense, brushed motor I do believe generate more heat.

I would run it on a 3rd water circuit, I already have two and have one more pickup off needed. Like Truckpull Larry said above, it?s not worth drilling my carbon hull for.