Wildthing Build

[FLEETMASTER]

Just after suggestions on length with this one,here's my running gear:

KB45 - 8XL
OEMRC 100 amp esc.
4S1P 5000mah/20c Zippy Lipo pack.(can run a pair in parallel)
Ordered from OSE-Speedmaster Mono Harware System,KB water jacket,OSE
mono turn fins, .150 assembled flex cable.

I'm builing from Fijian Cedar-3mm.
Will possibly fiberglass it too.

Intended for sport use / while fitting in race specs.

Looking at between 33" and 36".

Thoughts anyone??

[ReddyWatts]

I think you are on the right track, but if you are wanting to use an economy controller, think about using this one. The KB motors can draw a lot of amps. Your setup will probably push it around 40 mph.

http://www.himodel.com/electric/HiModel_GX_Seires_200A_3-7S_Brushless_Electric_Speed_Controller_Type_GX-200A-OPTO.html

Limit it to 125 amps, not 200.

OSE might start selling these, but dont see any.

[FLEETMASTER]

Ok,i'll check it out.
Aren't the KBs rated at 60 odd amps max?????(i have had this sitting around for a while)

[FLEETMASTER]

What about hull length too?? They are a heavy lump.

[ReddyWatts]

That is best performance max amps rating, but it can use over 100 amps easy. My KB45 10XL has used up to 135 amps before, just depends on how big a prop you load it with.

Your hull length/weight is good for a KB motor.

I am going to try an KB 8XL in a 29 inch Mean Machine with a small Y537/3 prop on one of these controllers. Think its going to scream around 50 mph on 18 NiMH's. This setup will not work in a 33 to 36 inch hull. The prop is to small.

[andym]

I built mine from 2.5 mm marine ply, glassed only the seems and at 31" is a heavier hull than my DF 33. Out of 3mm and glassed at 33+" it would be to much for a small esc, go with the 200amp unit and with those lipo's two pack would be manditory I think. Good luck they are a fun build and good hull.

[FLEETMASTER]

Thankyou for your tips guys!
I think that going with the 3mm ply,i won't need to glass it neccesarily,i'm not keen on doing it if i don't need to.
Deestingray didn't glass his Wildthing and he says it's hanging in well after a few big blowovers.
I was mostly concerned that the hull at 33" (my preference)may be too short and lacking stability.But it sounds as though it will be ok.
I have a Micropower, so i can start small with the props and upgrade the speedy when i have the $$.

[FLEETMASTER]

By building longer,i would have the option of running 6S too??
Obviously the esc would need to be much better quality than the fortune cookies.