Help with my scratch build CG

[F1 madness]

Im having a little difficulty working out my CG,on my new build.
Its a 37"mono hull that iv designed and built (my 1st mono build)
If you could have a look for me and see what you reckon would be gratefull
http://forums.offshoreelectrics.com/...ad.php?t=15627
Thanks F1

[Fluid]

Most monos run best with the CG between 25% and 30%. The optimum placement depends on the amount of total lift in the hull ( areo and hydro) balanced with the speed and total weight. Make the CG adjustable between these limits and you should be golden.

I'm afraid that the Scorpion S-3020-12 motor is on the small side for a 37" boat. It lacks the torque to spin a very large prop, and a 38mm prop won't push that big hull very well. I run an HK4025/6 on 6S1P in my 34.5" cat and get 45-50 mph with an x455 prop.

Regardless, that's a nice build!



.

[F1 madness]

Most monos run best with the CG between 25% and 30%. The optimum placement depends on the amount of total lift in the hull ( areo and hydro) balanced with the speed and total weight. Make the CG adjustable between these limits and you should be golden.

I'm afraid that the Scorpion S-3020-12 motor is on the small side for a 37" boat. It lacks the torque to spin a very large prop, and a 38mm prop won't push that big hull very well. I run an HK4025/6 on 6S1P in my 34.5" cat and get 45-50 mph with an x455 prop.

Regardless, that's a nice build!



.

cheers bud,im working on it now trying to fit everthing in as is tight due to the height,a little whoopsie on my part but will get their,was just srtuggling to get the cg and being my 1st mono wasnt sure were would be best to start with but can carry on now.
iv got a 540L 1800 but will only take up to 5s,due you think its worth trying that instead then on 4s

[F1 madness]

Took a couple of pics and worked out CG:29%



Pic of CG:28%

Which do you think will work best?
Just trying to work out to move rudder starboard side

[Fluid]

Tough call on the motor, neither are optimal. I'd start with the 6S setup and a 42mm prop, run for just one minute ( use a stopwatch!) and then bring it in and check for heat.


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[F1 madness]

Im just hunting around for a new motor and seen this:
Scorpion HK-3026-1400KV
Specifications
Stator Diameter 30.0 mm (1.181 in)
Stator Thickness 26.0 mm (1.024 in)
No. of Stator Arms 12
Magnet Poles 10
Motor Wind 6 Turn Delta
Motor Wire 24-Strand 0.25mm (AWG)
Motor Kv 1400Kv RPM / Volt
No-Load Current(Io/10V) 3.33 Amps
Motor Resistance (Rm) 0.010 Ohms
Max Continuous Current 80 Amps
Max Continuous Power 1680 Watts
Weight 199 Grams (7.02 oz)
Outside Diameter 37.50 mm (1.476 in)
Shaft Diameter 4.98 mm (0.196 in)
Body Length 48.4 mm (1.906 in)
Overall Shaft Length 74.2 mm (2.921 in)
Max Lipo Cell 6s

Do you think this will be anygood.
Im relativly new to brushless & lipos so just trying to see what would work best.

[F1 madness]

Alrite bud struggling to decide what set up would be best,which 1 would you say,im trying to take into prop-torque and balance and trying to keep everything as low as possible.

this 1 or 1 of the other 2 in post above.
really apreciate your help mate cheers