Battery Location for MiniCat Tsunami

[silvermansteve]

hello. i bought an artr tsumami here from a nice member. does anyone know how far forward to put the batteries? (i'm assuming 2 5000mah 2s will work....) if it matters, i'll probably use a 60a hobbyking plush esc with water cooling plate and a sv27 motor, or similar. thus i might try a 36/40 2000-something kv ammo motor i don't know what to do with....

[sailr]

What is the Tsumami? Do you mean a Samurai? We never made a boat called Tsunami.

[sailr]

If it is the Samurai, I can help.

[silvermansteve]

samauri, yes

[sailr]

Steven, first, the 60A esc should be sufficient with the SV27 motor. I set one of these boats up for Spec Offshore with a UL-1 motor and it ran great! 2 2S 5000mAh packs in series will work fine. As far as where to place them, Balance the boat at 30-35% of the length of the boat from the transom. Put your batteries where that will be achieved. When you run the boat, you can adjust the riding attitude by moving the batteries fore and aft. If it runs 'wet' (bow digging in), move the packs back slightly. If it wants to fly, move the packs foreward. Once you find the sweet spot, take a magic marker and mark where the packs go so you can get the center of gravity right each time!

If you don't already have the SV27 motor, I suggest you get a UL-1 motor for it. Run an Octura X445 prop on it.

Have fun. It's a GREAT running boat. Unfortunately the factory discontinued it so there are no more of them. I know the guys in our club were blown away by the performance of the Samurai with the spec setup!

[tlandauer]

I got two from Jim, like I said in the For Sale thread, these two are my favorite. Jim, I ran x642 with good results but was thinking about trying m445, don't have a x445 at the moment. Do you think m445 will work?

[sailr]

On second thought, I think a 442 or 642 is a better choice. With the submerged prop, the M445 may be too much. The Graupner carbon filled 42mm prop works good too.

[silvermansteve]

thanks very much for the info on the center of gravity and the recommended props. i'm sure i will enjoy running this boat.

[tlandauer]

DSCN1835_002.jpg DSCN1837_001.jpg
On the one with UL-1 motor, I only had a x440 ( small) but the speed was not far behind my other one ( MC motor, x642). Yes, when I got the Samurai from Jim last year, the Graupner 42mm worked well.
Double check the epoxy around the motor mount, on one of the boat, UPS's rough handling resulted the motor mount was knocked loose---no big deal, I epoxied it back with the help of FG tape on both sides of the mount. In my opinion the hull has very good quality but the epoxy on the motor mount and the strut look a bit brittle and yellowish, same goes to where the stuffing tube enters the hull. so you might want to reinforce those two area, I put FG tape on top with 30 min. epoxy.

[silvermansteve]

tlandauer, thank you. so, you just brush on the epoxy, apply the tape, and then, another layer of epoxy over the tape, correct?

[tlandauer]

First make sure the surfaces are clean, in my case I had to scrape all loose epoxy away, I slightly sanded the motor mount, put it back according to the original angle--important but easy as there is a line (impreesion) formed by epoxy. On the motor side you have to be careful so the add-on tape does not get into the motor area, I used two small pieces on each side. The other sise you can run the length of the mount, make sure the tape does not get higher than the hole for the motor shaft.
It is more important that you saturate the tape with epoxy, position them correctly, press down to the surface to be glued on, then brush epoxy on. I didn't brush on too much before that because too much goo makes positioning a bit slippery. hope this helps, enjoy the boat!