Modified Super Hawaii

**NativePaul** · 04-17-2010, 09:04 PM

Have you modified the bottom of the hull too? If not with a 1521 it will be all over the place, with the amount of rocker they have stock a 700 can motor on 12 cells is too fast for a stable ride.

A 1521 is a big moter with a lot of torque, some serious hull reinforcement would be a good idea, at least from the motor back to the transom.

**BILL OXIDEAN** · 04-17-2010, 10:49 PM

I REALLY like this project..

**SuperHawaii** · 04-18-2010, 01:54 AM

well i've left what was at the bottom of the hull. The previous owner had hot glued some wood down for the motor mount which was pretty darn sturdy. the other thing I was thinking about doing was adding some turn fins. The servo is stock too. i'm prolly goin to change that out to a Traxxas waterproof servo. if all else fails i can just drop the brushed motor and ESC back in and just change the coupler an flex shaft. i'm determined to get this thing cruz'in an reach around 40mph. give more tips an info i should consider.

**NativePaul** · 04-18-2010, 06:30 AM

Cut 6-8 inches off the back end and cut the transom off that bit leaving a few mm on the transom then turn the transom round and glue it inside the hull where you chopped it off, this gets rid of the excessive rocker and gives you a sharp transom, there where a few of these running in our area and when we saw the first cut down one it was such a night and day difference that we cut ours down that night, it turned it from a bucking bronco that you could only be sure would keep going straight on under 1/2 throttle to a reasonably competent race boat while it no longer looks like a scale superhawaii it still looks like a scale model of a generic offshore boat, alternatively you could apply filler to the rear of the hull in several layers to flatten it off which would keep it 100% scale looking but calm down its behavior at high speed, it would be a lot more work but it may cope with 1521 power better than a cut down one, although it may not oval as well if that is your intention.

**SuperHawaii** · 04-18-2010, 08:32 AM

any filler in particular that i should use. I really wanna keep it the way it is and make it work the way it is. if i have to add to it to make it work then thats what i'll have to do. how easy is it to use filler on this plastic??? would fiberglass be better to work with. it sure seems like it would hold out in the long run. what about moving the motor further back to the rear after layering the bottom to smooth it out and moving the battery packs up front. think anything like that would help it out. wheres a good place to add turn fins. I'm not using it to do any racing with. it's just a project boat that i thought would be fun. thanks for the info by the way.

**NativePaul** · 04-18-2010, 04:14 PM

I dont recall what the filler was called as it was many years ago, it was grey, smelly, kinda rubbery textured when wet and I think it was made for airfix type 1/72nd scale static kits.
You dont want to be glassing the outside of the hull as the glass will be tougher than the hukk making it near impossible to sand back to level neatly.
I've thought of a better way then using tons of filler on the bottom to level off the back, if you cut the rockered section of hull floor out at the back and sides but leave it attached at the front you should be able to weight it down flat on a table then either glue ABS fillets in at the sides and back with stablit express or join it back up with glass (glass wont stick direct to the ABS hull so spread a thin layer of Cyno over the hull where you want to glass and the resin will stick to the Cyno) then do some minor filling to the outside.
Once cut down the handling was OK with a 700bb turbo and 12 nicads at 30-35mph so it never got turn fins but I would guess that like most monos the fins should go as far out as you can get them and at 90degrees to the deadrise of the hull, on the left side for left turns, on the right side for right turns, both sides for even turning,wherever you put them the transom will need significant reinforcing around that location.

**norbique** · 04-20-2010, 03:35 AM

A friend has a Super Hawaii he's putting a KB 45 in. He bought it second hand and the first thing he did was to lay glass inside the boat on the bottom and the sides. He used polyester resin to wet the glass, and it stuck to the ABS without any problems. The ABS is very weak on it's own, especially if you're putting in monster motors. I can take you some pictures of it if you want. He also glued a piece of 4mm ply to the transom from the inside.

**SuperHawaii** · 04-20-2010, 05:46 AM

That would be helpful if i can get some pics of his setup/boat. How does the KB 45 Compare to the Neu 1521?? I almost wanna just pay someone to work on this thing so i dont have to. i dont know if i can cut it up a little to make it handle the way it should with the motor. i'm not the best craftsman. im not going to be able to get to this until around july anyways. keep feeding me info/ideas though. The More the better.

**SuperHawaii** · 05-05-2010, 02:09 PM

Okay, So i seen that the UL-1 Superior is out an is pretty interesting. How about putting the 1521 and hydra120 into a hydro. are there any hydros that work well with that motor and ESC??? i think i'll just drop in a smaller motor into the hawaii an keep it at the 30-35mph range.
Let me know what you guys think

**norbique** · 05-05-2010, 03:15 PM

Hey Superhawaii,

Sorry for the delay in my repsonse. I will take some photos of the setup. We ran the boat for the first time couple of days ago. The KB pushes is really nice. Impressive so to speak. The driver didn't want to run at full speed, we were checking temperatures, etc. I have a short video of it, I will try to put it up on U2be. The 200A ESC without watercooling was quite hot! So my friend added watercooling block on the ESC since and we'll try it next time. The KB is a power hungry monster. Not very efficient so to speak. If you can afford the neu, go for it. Im sure you wont' regret it, but I don't know if the 1521 is enough or not, some other people please comment here.

**norbique** · 05-06-2010, 06:46 PM

Here are the pics showing the setup. The KB 45 (1400kv) has a nice carbon water jacket. Battery is placed in front of the motor, a 4S 5000mAh 30C FlightPower LiPo. You can see the radio, and the ESC is held in place by the white Velcros.
The boat has a fully submerged prop, sorry but I don't know the diameter.

Attached Files

**Rumdog** · 05-06-2010, 07:55 PM

The 1521 will be way more than enough. The hull may be ok with no mods to the running surface as well. Check out this fellas modded S-Hawaii: http://www.youtube.com/watch?v=PSCXhbdJeH0

**Make-a-Wake** · 05-06-2010, 10:10 PM

I've got basically the same hull, same size, length, probably from the same mold..............the NQD spurt..........running a 13XL Feigao on 6s........32mph GPS'd. Its about all it can handle in my opinion.................roughly 3 times stock speed.

Attached Files

**Hi8iS** · 05-29-2010, 08:02 AM

Originally posted by Rumdog

The 1521 will be way more than enough. The hull may be ok with no mods to the running surface as well. Check out this fellas modded S-Hawaii: http://www.youtube.com/watch?v=PSCXhbdJeH0

Very cool video. I know him. He works at one of my local LHS. RC Hobbies in Waterford MI. What part of MI are you from Rumdog? Always looking for people to run with & I have access to lots of nice calm smallish private lakes.
I have 2 of these hulls. One is a Super Hawaii, the other i a Cesa 1882. Both are different from decals, to actual shape of the hull. The Super Hawaii is stepped while the Cesa isn't. I have been watching your thread as I am gathering parts now to start mine. I will start a thread once I begin & decided which one of the hulls to start with 1st?

Modified Super Hawaii

Modified Super Hawaii

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment