Best motor for 1040mm Genesis

[sundog]

Looks like you could use a bigger pond. Nice job on the EKOS, it is a bottle rocket.

[bracka69]

Hello guys,
I also have a CF genesis, I am running a Nemesis Gold(Leopard) 482(4-9s) 1600kv from fine design with a Swordfish 240A hv esc. I'm using 2 hyperion G3 EX 4S 5000mah 45/90c lipos in series for a 8s setup with an Octura X640 polished/balanced prop. I'm also running 2 hyperion G3 EX 3S 5000mah 45/90c lipos in series for a 6s setup using a Octura x645 polished/balanced.

If guys can give many any feedback and advice on these setup's it will be greatly appreciated.
Thanks,
Joshua

[Fluid]

A 2200 Kv motor on 6S1P is really too much. I used a 'similar' setup to run 88+ mph through the traps with a slightly smaller cat - a Castle 1515/1Y, ThunderPower 65C/5000 mAh cells and a Castle ICE 240. I was pulling 250+ amps and it heated things up pretty fast - two passes and back to the bank. More than that and all bets are off. A lower quality setup and who knows. The reason the boat is slower than it should be is probably the prop size - 42mm is too small for a 40" hull, you are spinning a lot of rpm for nothing....

I am running a Nemesis Gold(Leopard) 482(4-9s) 1600kv from fine design with a Swordfish 240A hv esc. I'm using 2 hyperion G3 EX 4S 5000mah 45/90c lipos in series for a 8s setup with an Octura X640 polished/balanced prop. I'm also running 2 hyperion G3 EX 3S 5000mah 45/90c lipos in series for a 6s setup using a Octura x645 polished/balanced.

A 40mm prop is really too small for a 40" boat, you will be losing efficiency and spinning a lot of rpm for nothing. The 1600 Kv motor on 8S is silly, it's a SAW-only setup which will burn up equipment if used much. On 6S not so bad, with a 45mm prop you are getting closer to an efficient prop size for the hull. That should be a 60 mph system if the boat is properly set up. An x447 might be more efficient but it also may stress the motor more, you'd have to try it.



.

[bracka69]

Thanks a lot Fluid for the input on my setup. I have been watching it closely with the 8s as did Chris from fine design told me to also and after running for a while and bring it back to shore the motor and esc are just barely warm. So in your opinion the x447 would be a better prop for my 6s setup?

[Marinetechal]

To give you another example, here's a boat with 2200kv motors on 5s. It's a twin, so that helps, but it's still substantially less RPM than your pursuit and this boat went 74MPH. Props were x442s.
http://www.youtube.com/watch?v=khVcE...eature=related

Thanks Keith for your feedback, when I first decided to upgrade my Pursuit I did some research on what others were using (motors/esc etc)
Many on Youtube and a few forums seem to favour the 2150kv, I was fairly new to brushless/Lipo technology so I went ahead with that chioce.
Now I am realising I have overstressing issues if I continue to run 6s. What do you suggest I do with my pursuit setup, stick with my present motor and run 4s or repower if I want more speed. I do have a x442 and a x440/3, what other props do you suggest. Appreciate your input.

[Flying Scotsman]

As has been stated 8s is an not a good idea on your setup and to be honest I am surprised that your ESC has not gone boom.....is this your first boat?

Douggie

Hello guys,
I also have a CF genesis, I am running a Nemesis Gold(Leopard) 482(4-9s) 1600kv from fine design with a Swordfish 240A hv esc. I'm using 2 hyperion G3 EX 4S 5000mah 45/90c lipos in series for a 8s setup with an Octura X640 polished/balanced prop. I'm also running 2 hyperion G3 EX 3S 5000mah 45/90c lipos in series for a 6s setup using a Octura x645 polished/balanced.

If guys can give many any feedback and advice on these setup's it will be greatly appreciated.
Thanks,
Joshua

[brandon49ers]

I run two 4s packs. TP power 4082 , 2200kv from fightercat. 180amp esc. x442 prop. Boat runs 50mph . very reliable set up

[bracka69]

Hello Flying Scotsman,
yes this is my first electic rc boat, i've has a few gas boats in the past but decided to try a brushless setup. According to most people i've talk to sayed the 8s would be ok. I have also seen a few videos with this setup running ok. I was told to just monitor my temps(motor and ESC) and they are perfect.

[keithbradley]

Thanks Keith for your feedback, when I first decided to upgrade my Pursuit I did some research on what others were using (motors/esc etc)
Many on Youtube and a few forums seem to favour the 2150kv, I was fairly new to brushless/Lipo technology so I went ahead with that chioce.
Now I am realising I have overstressing issues if I continue to run 6s. What do you suggest I do with my pursuit setup, stick with my present motor and run 4s or repower if I want more speed. I do have a x442 and a x440/3, what other props do you suggest. Appreciate your input.

Either one...either stick with your 2150kv motor and run 4s, or go with something closer to the 1500kv range (+/-100kv) and run it on 6s. With the 6s setup you will have the freedom to run a bit larger prop than you are now, something like a x445, x642, or s220.

As far as the matter that other people are running high RPM setups on youtube, yes...you are right. You can always find people (usually relatively new to FE) who are running crazy setups and they live longer than you would expect. You can also find people who try these setups and lose their boat to a smokefest on the first run. People who are running a 2200kv motor on 6s are likely pulling upwards on 300+A. They might get away with it for a while, but it's obviously not a logical choice for a dependable setup.

[Marinetechal]

Either one...either stick with your 2150kv motor and run 4s, or go with something closer to the 1500kv range (+/-100kv) and run it on 6s. With the 6s setup you will have the freedom to run a bit larger prop than you are now, something like a x445, x642, or s220.

As far as the matter that other people are running high RPM setups on youtube, yes...you are right. You can always find people (usually relatively new to FE) who are running crazy setups and they live longer than you would expect. You can also find people who try these setups and lose their boat to a smokefest on the first run. People who are running a 2200kv motor on 6s are likely pulling upwards on 300+A. They might get away with it for a while, but it's obviously not a logical choice for a dependable setup.

Thanks again Keith, I think I will run with 4s for the time being with my Pursuit and concentrate setting up my Genesis on 6s 4082/1600kv 3/16" flex shaft upgrade, x642 or x645. I can monitor my battery temps and voltage via Quanum Telemetry. I will let you know how I go when it's setup if you don't mind.

[petej]

Hi,

What speed would you expect on this boat with a Leopard 4074 1800kv, Seaking 180A ESC, 4S 40C and and x645 prop?

[JonD]

Hi,
What speed would you expect on this boat with a Leopard 4074 1800kv, Seaking 180A ESC, 4S 40C and and x645 prop?

Pete, I used the OSE on-line speed calculator for my Genesis set up and got precisely the same speed on my GPS, that the OSE calculator predicted.

I ran your figures through on the same basis as mine, using the specs you provided. Also I used the same following figures that I found gave me accurate speed prediction results for the Genesis. i.e 90% for motor efficiency, and prop slippage 20%.

Based on this, it predicts your top speed 51 mph (83 kmph). Try the calculator yourself.

Cheers,

Jon

[Mattwarner]

I have a CF genesis and run a 4082 1600kv with a T180 on 6s, prop is an x443 and it runs fast enough for me and cool.

[petej]

From the calculator, even with a 2200kv motor at 4S with a 1.6mm pitch, 45mm dia. prop, top-end is 59mph, i.e., high-50s.
To get into the 60 or 70mph range, you need a 2200kv motor, >= 5S, 1.6mm pitch and a 40-45mm dia. prop.
The variables remaining are, motor power capacity and ESC amp requirements. The Leopard 4074 motor is 1500 < 2000 watts and the 4082 is 2000 < 3500 watts.
Appears the 4082 2200kv motor with say, the Seaking 180A ESC would be a good setup.

Thoughts?

[JonD]

......... The Leopard 4074 motor is 1500 < 2000 watts and the 4082 is 2000 < 3500 watts.
Appears the 4082 2200kv motor with say, the Seaking 180A ESC would be a good setup.
Thoughts?

I am using, 4082 1550kv with Seaking 180, 6S. I am getting spot on 60 mph with only a M445 prop (1.4 pitch, 45mm dia). I can still go up to a M545 which I will be trying in a couple of weeks, which should get me easily in to the 60 -70mph range. As for a 645 prop - not sure I really need it!

I think you are going to have to go more than 4S to get above 60mph regardless of whether you choose 4074 or 4082. But an 8082 at 2200Kv may be a bit of an over kill. I prefer to go to 6S with lower Kv motor to keep the current lower but still end up with the same RPM

Jon