atomic 58 inch catamaran motor question

[Bri6672]

Wow this thread has gotten pretty quiet...

3 more runs on my ARC today and i used me gps data logger to track the performance top speed was 55mph in mild chop! I'm super happy with the setup, it's reliable and allows use of the stock setup other than motor! I was get some amp readings next run.

[Brushless55]

Ok so I am going with an HET 700 98 1170kv. It is basically a copy of the Neu 1527 but a Better kv for 6s. Going with a water jacket and a rear mount clamp to support the 4"s of motor. This should be a good bump in performance but allow me to stay at 6s and get good run times with the 11600 mah I am running.

Boats are kind of a side thing for me hobby wise, I normally play with big 20-30 lb EDF scale jets and I have been running some HET motors pretty hard in jets the past 2 years and have had great success so I decided to give them a shot in a boat. I am going to make a new front mounting plate for the motor mount (if I can't modify the stock one) I am going to attempt to use the existing motor shaft coupler and drill out the motor end for the 8mm shaft if that dosent work we will just fab a new one

All the stuff should show up end of this week and I will post picks of the build and the performance via video, hoping for the upper 40mph range maybe touch 50 but still have the convience of just 2 batteries per run and a good run time (7-8min)

Do you have a link to where you bought your motor?
thanks!
your giving me a wonderful idea

[Bri6672]

I buy them direct:

http://www.highendrc.com

Great motors for the money, I have 5 of them running in various aircraft and love them!

[Brushless55]

Awesome, thanks!
I have a 1527 and love that motor and these are much cheaper priced

[forescott]

My arc the last couple of runs has been coming in waaay hot! Just under 200 degrees with about 6 minutes run time. Looking for ways to keep the temps down in the 150 range. I swapped the t-120 it came with for the t-180. Esc was 84, and single 6s 25-50c zippy was @103. Seems like the motor may be going out or maybe I need to free up the prop a bit by raising the strut? Thinner lube on the flex shaft? Maybe even an electric fan in front of the motor? I really don't want to replace all the electronics to something bigger. The boat is really light and runs a consistent 40 mph in its stock configuration. Any more ideas??

[lenny]

Any vid yet ?
What timing are you running with that setup,
Also can you post some pic of the inside setup to have a look ?

[ray schrauwen]

The bearings on the stock motor could be going. Replacing them may help bring temps down but, 6 minutes seems like a long run to me, but, thats just me.

[forescott]

Any vid yet ?
What timing are you running with that setup,
Also can you post some pic of the inside setup to have a look ?

18 degrees I think. I bumped the timing up one setting from the esc default setting thinking that an outrunner typically likes higher timing. I will definetly drop the timing and see what happens. I consistently get 40 mph on GPS, so ill check the speed to see if the reduced timing has any effect. Good thinking!

[forescott]

The bearings on the stock motor could be going. Replacing them may help bring temps down but, 6 minutes seems like a long run to me, but, thats just me.

6 minutes seems reasonable to me. Only running a single 6s, 5800mah pack. If the bearings are bad I'd more than likely just replace the motor.

[forescott]

Sorry Lenny, I've been trying to figure out how to film and drive at the same time. I have an old flip video camera I'm trying to mount to my transmitter. I've got a couple of runs on the big 56 inch p-1 as well, but having some handling issues and a pinched o-ring on the cooling can caused the hull to fill up with water on the first run. I'll get some vids posted soon.

[lenny]

Flip phone,
Maybe have the bottom of the flip phone flat against the bottom of the tx with some straps of velcro holding it there.

On v500 outrunner I moved the timing up when testing from 15% to 26.25 and it runs cooler,
With still good power and run time to.

Those outrunners do run a lot hotter normally than the inrunners do,
But I think they can handle it better.

Also check that you still have good water flow to the mount,
And at water pickups and nipples of mount to.
Their could be some debris slowing the flow of water to.

[forescott]

Flip phone,
Maybe have the bottom of the flip phone flat against the bottom of the tx with some straps of velcro holding it there.

On v500 outrunner I moved the timing up when testing from 15% to 26.25 and it run cooler,
With still good power and run time to.

Those outrunners do run a lot hotter normally than the inrunners do,
But I think they can handle it better.

Also check that you still have good water flow to the mount,
And at water pickups and nipples of mount to.
Their could be some debris slowing the flow of water to.

Really? I was always under the impression tha more timing meant more power and more heat. I'll have to do some testing for sure. And I have an idea for the flip camera. Will give it a shot early monday or tuesday.

[Brushless55]

Really? I was always under the impression tha more timing meant more power and more heat. I'll have to do some testing for sure. And I have an idea for the flip camera. Will give it a shot early monday or tuesday.

for most inrunners

[forescott]

I did a little reading on motor timing, and it seems that more timing equals more power but less efficiency, however motor pole count is the big factor. A motor with more poles will typically have higher timing. So I guess that makes sense that the 8 pole t-600 would require higher timing than a 4-pole in runner. I bumped my timing up to 22 degrees and swapped all the connectors from stock 4mm on the motor to some castle 6.5's that I had lying around. Also raised the strut just a bit to free up the prop. Tomorrow Ill run it again and compare the temps and top speed.

[lenny]

Yes the 6 pole outrunner are a different animal of motor for sure.
When I was testing and reading about them,
They called for a lot higher timing for most of them.
I know Ben at fightercat had said to put them at 15% timing or they will run hot,
Hear a link to some info on the stock venom motors from pasted boats.
http://forums.offshoreelectrics.com/...lacement-motor