Twin out-board cat discussion

[F1 madness]

just want to get peoples opinion on this,im thinking of building a twin out-board Cat,this will be designed and scratch built by myself this is what iv come with:
hull 40"long x 13"wide x6"high to keep a low sleek looking hull.
(1/4 marine grade ply & 2mm,3mm Lite-ply)
2 x OS outboard legs
2 x Scorpion 4025,1100kv,6s,2200watts,100amp
2 x 200amp ESC
2 x metal geared hi-torque servo,running twin links to each Ob and linked together
2 x 47mm 3 blade props L/R
4 x 5000,30C+,3s.2 running in parallel to each motor
What you reckon,iv started drawing it up and hopeing to start build shortly LOL

[F1 madness]

This is what im aiming for
Hull:

OS leg:

Scorpion HK4025,1100kv:

[F1 madness]

option 2

Doing abit more research LOL
what about this set up:
2 x OS outboard legs
2 x Scorpion 4025,890kv,8s,2700watts,95amp
2 x 200amp ESC
2 x metal geared hi-torque servo,running twin links to each Ob and linked together
2 x 51mm 2 blade props L/R
4 x 5000,30C+,4s.2 running in parallel to each motor
which option do you think would be better

[ozzie-crawl]

hey daz,have you looked at the REK lowers,not as nice looking as the OS but composite so both would probably weigh less than one OS, probably cost less to buy 2 reks than one os as well.
just a thought as there would be a lot of weight in the a$$ end
lol just looked at the size 40", should be ok with that power having a bit of weight,check prop size as most legs are limited to prop with the cav plate on

[F1 madness]

hey daz,have you looked at the REK lowers,not as nice looking as the OS but composite so both would probably weigh less than one OS, probably cost less to buy 2 reks than one os as well.
just a thought as there would be a lot of weight in the a$$ end
lol just looked at the size 40", should be ok with that power having a bit of weight,check prop size as most legs are limited to prop with the cav plate on

Alrite bud
i have looked at the rek legs,but with the size of the hull and weight,just thought they be abit stronger.
im either not gonna run cav plate or will make a spacer for it as it screws on so not to worried about that part.
i will also install water pick ups in the sponsons,so wont matter if i run with or without

[steveo]

might want to use inrunner motors because of the wet location

[j.m.]

Outrunners would be better since they would shed any water more easily than an inrunner trapping the water inside the can.

[F1 madness]

Cheers bud,but will be running outrunners,i know a couple others who run outrunners on outboards with no trouble.

[ozzie-crawl]

yea out runners are great on tunnels,bit of a spray with wd40 at the end of the day to flush them out and there done

[F1 madness]

yea out runners are great on tunnels,bit of a spray with wd40 at the end of the day to flush them out and there done

sorted,which option do you think would be best buddy,you always give sound advice and i trust you

[ozzie-crawl]

first of dont listen to my dribble,its a lot safer
i tend towards high volts lower amps if it can be done. just check that the scorpion motors in the larger sizes bolt patten will fit the standard adapter on the lower leg (25mm) also the motor shaft needs to be 5mm i think as the square ended flex couplers are for 5mm shafts
i would look at twin cats around the same size and see what power there using
as in watts,shoot for some thing similar.
i think 6s with twins would be nice,hopefully doby mite chime in as i think he had a fair size scorpion in a cat,he may have more idea on there power out put and if a out board would handle the power

[F1 madness]

first of dont listen to my dribble,its a lot safer
i tend towards high volts lower amps if it can be done. just check that the scorpion motors in the larger sizes bolt patten will fit the standard adapter on the lower leg (25mm) also the motor shaft needs to be 5mm i think as the square ended flex couplers are for 5mm shafts
i would look at twin cats around the same size and see what power there using
as in watts,shoot for some thing similar.
i think 6s with twins would be nice,hopefully doby mite chime in as i think he had a fair size scorpion in a cat,he may have more idea on there power out put and if a out board would handle the power

Already checked bud: 5mm shaft,25mm hole spacing,thats why i chose these

http://www.scorpionsystem.com/files/i1,199_full_dimension.pdf

I have looked at a couple,but most seem to run singles,but did find this

http://www.rcgroups.com/forums/showthread.php?t=1043673

[ozzie-crawl]

i havent looked at the big scorps for awhile couldnt remember.
i remember that blue cat,still got pics on my computer of it.
mite be worth sending the guy a pm

[ozzie-crawl]

for got to add he is a member on here and knows his stuff

[F1 madness]

i havent looked at the big scorps for awhile couldnt remember.
i remember that blue cat,still got pics on my computer of it.
mite be worth sending the guy a pm

might do that actually,see your full of bright ideas