King Of Shaves C1 Brushless!

[thrashmetal]

king of shaves onboard cam

love this video .

this new kos looks like a really nice boat and i think it will really move one dual 4s lipos.

the venom guys tried one on 8s and it was flying. they had no issues running 8s on it so far.

[NitroVal]

love this video .

the venom guys tried one on 8s and it was flying. they had no issues running 8s on it so far.

I somehow highly doubt that seeing as how:
A. The esc is only rated at 60 amps and 6S
B. The 2850kv motors would fly apart with that much power
C. One full throttle run with that power would turn it in a floating bomb

[Eggy]

If you dont belive it check out the video, it's on youtube.

[NitroVal]

Im gonna need a link cuz I dont see it

[hebner]

That would be one 4s pack for each motor not 8s.

[NitroVal]

That would be one 4s pack for each motor not 8s.

Thats all I could think that they are being mistaken by. This boat has dual motors and ESCs, so it requires two packs.

[6S HYDRO]

2 4s packs- its not 8s and never states 8s.

[Brushless55]

love this video .

this new kos looks like a really nice boat and i think it will really move one dual 4s lipos.

the venom guys tried one on 8s and it was flying. they had no issues running 8s on it so far.

The video shows the cat running on 4s packs..

[Simon.O.]

I somehow highly doubt that seeing as how:
A. The esc is only rated at 60 amps and 6S
B. The 2850kv motors would fly apart with that much power
C. One full throttle run with that power would turn it in a floating bomb

You are correct
Rough estimates give the following figures with 8S power
140A per motor
3500W per motor
90+ mph based on 69000 rpm.

Now back to reality
I can tell you that a 31mm non-metal prop will blow at 40000 rpm (estimated)
A 380 fed with 3500W of power will cook a steak........well, if it survives.

I need not go on as it is clear that this hull will will run well on 4S PER motor
and not 8S as some may read.

If you really want proof then buy one and hook up 8S per side and see what happens.
It is not me you need to shout at when it all goes up in smoke.

Re-read the whole story and make some informed decisions.

I like the idea and proof that 380's can make a Cat this size rock.
It gives me a lot to work with.

Well done Venom !!

[Eggy]

Just so its clear the video says Dual 4S, thats 4S PER motor.
From my calculations that is just over 43.000RPM UNLOADED with fully charged packs. No way that the motors will get those numbers when under load.

I agree that trying to go 8S PER motor is not going to work.

http://www.youtube.com/watch?v=N0YxjbNGlLE

[NitroVal]

A 4S will spin that motor unloaded at 42180rpm. Using OSE's calculator, I entered an 80% efficiency and 20% drag. This puts the motor right at 33744rpm loaded and a top speed of 42mph. I can vouch that this calculator is pretty accurate as with 3S batteries, it says top speed is 32mph, which I measured 31.3 on GPS..

[Brushless55]

Anyone tried 4s yet with a gps?

[NitroVal]

I just got back from the lake to try my prop mods. I filed down all the casting flash left over from the factory and polished the props in a tumbler last night. It seemed to have worked. New top speed was measured at 35.0mph in the same conditions (less wind) on 3S. I think there may be more left in it with some ESC programming (max out the timing perhaps?) and maybe some prop angle adjustments to reach that elusive claimed 40mph out of the box number.

[Rumdog]

The FE calc does not factor in twin motors or hull size. Twin motors matters a lot. having twins allows the motors to work more efficiently because there is less load on each one. Plus it has twice the propulsion.

[NitroVal]

I can agree to that. However I think the top speed wont be that far off versus a single motor. What the dual motor makes up for in power, it suffers in weight and drag, and vice versa for a single motor. Acceleration would definitely be quicker having dual motors.