Mean Machine Catamaran (Sport)

[Brushless55]

I don't know man, I have a 4" on mine and it turns sharp and hard
I think the extra could cause the bow to pull down and make the hull run wetter?
140+ amps and only 40mph

[Rumdog]

The man machines dig a long rudder. I'd keep it!

[Brushless55]

second could be the rudder is huge..
I would take 2" off

[Fluid]

The first problem is the prop - it's too small for that motor. Try an m445 or m645 and see how it runs. The overall setup looks good from the photos, but a few questions:

- Exactly where is the CG now?
- Set the boat on a flat surface - where is the bottom of the strut relative to the sponson bottoms? What angle?
- What timing advance are you using on the ESC?
- How much gap between the strut and the drive dog?



.

[Rich]

here it is!!!!

ok gentlemen here it is a mean machine with a 580 6L, m440 prop, 6" speed master rudder and strut, .150 cable, 150 amp etti with 35v cap, 6.5mm bullet connects, and 4s 8000 mAH lipos. Speed 40 mph, amps on first run 150.53 2007 watts, hull was a little wet, 2nd run moved the strut up about 3/16" with a degree or two of angle, speed still 40 mph, amps 141.87 and 1851 watts better, but i still think it has more, temps esc 155f, motor 86f, per eagle tree elogger V3. I will try moving the lipos back more to fly the hull, are there any other suggestions to make it faster?

[Chilli]

That's it. With the 1.5" setback.

http://www.offshoreelectrics.com/pro...=ros-21-rudder

[Rich]

so this one it is then? pt# ros-21-rudder Speedmaster 21 Rudder Assembly 5.25" Long

[ReddyWatts]

I would use a rudder longer than 4" if running over 40 mph.

[ozzie-crawl]

from what i have heard people have had turning problems with the mini on theMM, i run the 6" on mine and it turns like its on rails

[Rich]

What rudder should i use with the MM? the speedmaster mini or the 6" one?

[ozzie-crawl]

yea it certainly will, think a lot of guys run from about 3/16 to 1/4

[DISAR]

Thanks, I will try that. Seems that it brings the motor temps down

[ozzie-crawl]

mine is 8mm from bottom of strut to bottom of sponsons and prop up about 2 deg, has a nose up attitude
running like this on fairly flat water its really stable speed is around 45 mph
but were i run has lots of cross winds and gets choppy a lot, but this is when the MM loves it the most and i pickup 3-4 mph
couldnt get mine to run properly on anything less than 8mm, just wanted to porpoise,

[DISAR]

What is your strut position? Mine is about 3 mm or 1/8" (botom of strut above bottom of sponsons) and parallel, and running in sea water

[ozzie-crawl]

About 3-4 mins. I also tried the 9XL on 4s but motor temp was a bit higher

thanks was just comparing to mine running a 8xl on 4s m440/3 is around the mid to high 40s and motor at bearings after 2 min is around 110 f esc caps the same