I need Shockwave 26 help

[Maggster]

OK, that didn't work so well. I tried the 40.5mm prop first. THe boat would barely go, so I brought it in and put the 45mm prop on it. It still acted very doggy. Wouldn't plane and was slower than before. The nose was definitely riding higher though. Then the motor quit responding. I brought it in and checked it the motor was pretty hot and smelled burned. I have no idea how many runs are on it since I got it used. AARRGGHH!

Not sure what to do next. I'll probably check the esc with another motor from one of my cars just to make sure it is the motor and not the esc.

[saleens7]

you were probably cavitating.....try tossing it in the water when you launch it.....you might also want to re-position the batt in front of the motor.....when you look at where the batt and motor are mounted in the hull, they are near the middle of the hull....normally, your supposed to have the CoG around 30%....

[Maggster]

It turned out to be the motor. I unhooked the motor and plugged another motor into the esc and it ran fine. I had a motor that I took out of a cordless drill that I knew was a high torque motor, so I put that in just to check it out. Now this motor is older than dirt and basically worn out. There is a lot of slop in the bushings, but in spite of that, the boat is probably twice as fast as it was. The only two problems I had were cavitation, and no coolant flow. If I held the front of the boat and throttled up there was no water flow. If I held the front and pushed the back lower into the water, I did get water flow. I have no idea how to fix that other than getting a new water pickup????

What motor would you recommend for this boat with the stock esc? I see the airplane 600 motors are about 1/2 of what the Graupners run, but they are bushing motors. I am pretty sure I don't want anything bigger than a 600.

I forgot the camera when I went to the lake. I'll try to get some video tomorrow.

Thanks so much for all the help. I was getting pretty frustrated with the whole thing.

[saleens7]

i ran a 600plane motor (very torquey).....but it doesent spin as much rpms....it should work better w/ the larger prop you have on it...you might want to move the rudder a little lower then...

[Maggster]

How much clearance do I need between the prop and the bottom of the rudder bracket? I now have about 2-3mm.

Should I be looking at the
19 TURN or the
22 TURN ?

[saleens7]

probably the 22 turn.....you will want more torque as you are running a somwhat large prop for a 600 sized brushes motor....

[evofan74]

Can someone help please! Sorry not trying to hijack the thread though, but.... I bought a shockwave 26 a week ago and bought a 7 cell intellet 3600 batt to go with it at my trusty hooby shop. Ran the boat once and in about 5 min it almost stopped completely but I was able to get it to limp back to the edge of the pond. The motor was very hot so I let it sit. The net day I ran it again and after a few min it stopped and wouldn't work at all even after cooling down. So i took it back to the hobby store and got a new one today. They are cool because I bought a villain ex from them and have had no overheating probs running two 7 cells.

Talking with the tech at the shop who seems very knowledgeable I told him I read about these stock motors being crap so he recommended a traxxas titan 550 like I have in my Ex but he didn't have any. So I bought a 19 tun trinity chameleon motor. SAme can size so I just swapped it out as soon as I got home and reinstalled my deans plugs. Now I run the boat for about 4 min again, slow for about a min or so to break in the motor and then progressively got faster. After about 4 min the boat starting acting up. I got it to shore and smelled heat. the motor and esc were warm but ok, BUT THE DRIVE SHAFT WAS SIZZLING!! I licked my finger and touched it and the wetness actually audibly sizzled! This was the first run of 4 min.!!!! Is there something wring with the driveshat setup in these boats stock? Are they not greased from factory? Please help, sorry so long.

[Maggster]

I would pull it apart and check the alignment of the motor and shaft. Mine is completely different, but I have heard other people mention that as a possible problem. It sure couldn't hurt to grease it while you have it apart.

[mocars2]

I have one of these and I dremeled off the bottom piece and had the shaft actally go out the back about 1/8" from the bottom. I used a Traxxas shaft and tube and a 45mm carbon prop - did alot better then what I see yours is doing.
What have you done to it lately.

[Maggster]

Hey Mocars2.
I actually haven't done anything other than run it. It seems to be working very well. I get plenty of run time the way it is. I kind of wish I would have gotten the 19 turn motor though. The 22 turn barely gets warm and I think it would be faster with the 19 turn. In spite of that, it runs great for what I have into it.

[evofan74]

Hey mocars well I have since lubed the shaft really well with marine grease (everytime) and I buffed the shaft down with some very high grit wet sandpaper. I am using a 19t Trinity Chameleon now and an Octure 431 prop and running on 7cell IB3600. Still haveing heat issues though. Can only run 3-4 mins at a time WOT. I think going with thte smaller Octura prop actually hurt the speed too and didn't help with heat. So I am going to try a little bigger than stock prop.

I need resolve this heat problem, because it's keeping me from running the boat....

[mocars2]

I think going with thte smaller Octura prop actually hurt the speed too and didn't help with heat. So I am going to try a little bigger than stock prop.

I need resolve this heat problem, because it's keeping me from running the boat....

If going to a smaller prop didn't help it get cooler - then going to a bigger is a mistake and add more stress to the whole unit producing more heat - IMHO.

[Maggster]

evofan74 check the alignment between the motor and the shaft. Also check to make sure the shaft isn't bent. When you put it together, the shaft should slide right into the coupler. You shouldn't have to push on it at all.

Maybe you already did and you already know that, but just in case...

[sidv13]

I hate to interrupt but I am looking for a set of turn fins for my sw26 and was wondering which ones of the ones that steve sell would be the best for this boat. I just dont know which ones to order. oh and maybe some good trim tabs also if you think they are needed.

[mocars2]

I hate to interrupt but I am looking for a set of turn fins for my sw26 and was wondering which ones of the ones that steve sell would be the best for this boat. I just dont know which ones to order. oh and maybe some good trim tabs also if you think they are needed.

Why do you think you need them? Do you have the newer version of the SW26? If so that boat seems to turn real well from the videos I've seen.


evofan74 - is the shaft still sizilling after you sanded and lubed it and ran the smaller prop? When you had it out did you roll it on say a piece of glass to make sure it wasn't bent? the Shaft should be one of the coolest parts because it's in the water to cool it down, and if's it's getting hot the that seems to me a friction issue. It can't be a volts or amps issue.so if there is friction there then I would guess that would make the motor work harder and draw more amps producing heat and also increasing the heat from the ESC.
A cheap way to maybe double check this is just go buy a brass rod from your local hobby store you got this stuff at and make a new shaft and see if the heat issue goes away?