New ShockWave 26 Brushless

[roadrashracing]

I had an esc go up also, has anyone done any mods to thse yet?

[SweetZ28]

Hi I think this may solve the drives breaking on the shockwave?? www.hobby-lobby.com sells a bunch of sizes?

http://www.hobby-lobby.com/ujoint.htm

[ALD]

Yes, I turned my Shockwave 26 into a rescue boat. Works great as a rescue with reverse. If I were you, I would not spend any money on your boat. Save the money and buy a FE boat without u-joints. U-jointed boats can not handle speed.

[mickvk]

Yes, I turned my Shockwave 26 into a rescue boat. Works great as a rescue with reverse. If I were you, I would not spend any money on your boat. Save the money and buy a FE boat without u-joints. U-jointed boats can not handle speed.

Me too. Two good reasons why: The steerable outdrive to me seems to push the boat over a lot if you're doing anything fast. I prefer the straight drive, steerable rudder. Second, for a rescue boat, the steerable outdrive gives you excellent low speed maneuverability - and the same when you have a boat in tow. I tried to use a zig zag racer - it had enough power but was totally uncontrollable as a rescue because of the "payload" at the end of the line...

[yellowbird]

Shockwave 26BL testing

I have recently upgraded my Shockwave 26RS to brushless using the ProBoat 2900kv motor and switched to LiPo; I'm using a Hobbywing 60A marine ESC and an Eagle Tree logger to see how it all works together with some different plastic props.

On 2S (5000Ah 20C) Lipo the boat ran 28.1mph using a plastic Octura Y534 (basically same as stock prop but more durable - blades don't keep breaking off). Peak current was 59A and average under load was 52-55A (takes about 5 seconds to get down my local pond now!)

On 3S (3000Ah 20-30C) Lipo the boat hit 36.1 mph using a plastic Octura X431 (put on a smaller prop to reduce motor load). Peak current was 70A and average under load was 62-66A.

After about 1/3 of the pack I switched to a plastic Octura Y531 (same size but a bit more pitch). Speed was about the same (35.7mph max) but current went up to 75A peak and 64-70A under load. These would probably all be a bit higher with a fully charged battery.

Temperatures were all OK at <100F for motor, ESC and battery. Next time will try the Octura Y534 to see what the "worst case" is for current drain.

On this basis I would suggest looking for a 90A+ capable ESC if you want to run 3S long term. I think I will stick with 2S Lipo and go for a metal prop and the Shockwave BL turn fins to "finish it off", as the boat is pretty unstable at top speed on 3S and spins out in corners; the flat bottom center section means there is little directional stability from the hull, and the rudder can spin out if you catch a wave when turning.

[yellowbird]

Shockwave BL testing

More testing today with Octura Y535 metal prop on 2S lipo on my Shockwave 26. Max speed increased from 28.1mph (using plastic Octura Y534) to 31.4mph with same set-up of ProBoat 2900kv motor and Flightmax 2S 5000Ah lipo battery.

Current drain increased to 65A max and 55-60A at full power, so about 10% more speed for 10% more power drain vs plastic prop.

Thanks for the prop ALD!

[SweetZ28]

More testing today with Octura Y535 metal prop on 2S lipo on my Shockwave 26. Max speed increased from 28.1mph (using plastic Octura Y534) to 31.4mph with same set-up of ProBoat 2900kv motor and Flightmax 2S 5000Ah lipo battery.

Current drain increased to 65A max and 55-60A at full power, so about 10% more speed for 10% more power drain vs plastic prop.

Try a X435 that seems to work very good.

[ALD]

Glad to hear you didn't smoke anything. Looks like the perfect setup. 31mph is really good for that boat.

ALD

[yellowbird]

Shockwave 26BL testing

.... and tested finally with 3S lipo and the Octura Y535 to see how fast it could go.

Boat hit 40mph (actually 39.93mph according to the Eagle Tree logger), but peak current was 110A (probably the logger limit) and 95-105A over a few seconds - see chart. It then flipped off a wave and rolled while travelling in a straight line.

Therefore I think I'll stick with 2S lipo on this boat and the Y535 prop. 30mph is fast enough for this hull design - without a proper deep V rear section (it's actually a flat bottom in the center section) there isn't enough directional stability for high speeds, and 3S and a big prop is beyond the limits of my 3S lipo (60A continuous, 90A burst), ESC, the logger and probably the motor.

Time to think about a new project .......!

[rc2266]

Here is a video of mine, the 2nd time in water, nephew driving, at the end you see why we say ALWAYS tape the hatch...haha

http://s244.photobucket.com/albums/gg25/92kingv8/?action=view&current=PROBOAT2CRASH-1.mp4

[mickvk]

Here is a video of mine, the 2nd time in water, nephew driving, at the end you see why we say ALWAYS tape the hatch...haha
http://s244.photobucket.com/albums/g...AT2CRASH-1.mp4

Hey, what size rubberband do you use to keep the throttle on like that :)

Kidding of course. Man am I glad spring is here!

[rc2266]

Yea since then he has learned throttle response, of course it might have been that he had to swim to get it
All in all fun boat to toy with

[rc2266]

Made some homemade trim tabs, got rid of the slight bounce, very smooth now.

[Racer944]

Hi Guys;

Just ran my Shockwave for the first time today... ran very nice and I did tweak it a bit by setting the drive up as much as possible.

I do have a question for you guys though... what kind of run time are you getting? Mine is stock setup with the updated metal prop from Proboat and running DTX 5000 mah NiMh pack. I think I am getting about 5 mins or so but only putting back in about 3000Mah to the pack... Does this seem normal? I expected a bit longer run times frankly...

Basically the boat ran great until hitting (what I presume is) a low voltage cut off. I then was able to get it into the dock at slow speed. I put in the next pack and ran it again until the same thing occurred. I double checked that my ESC switch is set to NiMH and not LiPo. I kind of expected on NiMH that the boat would simply slow down gradually and that there was no real voltage cut off...

Any thougths are appreciated!

Cheers;
Eric

[mickvk]

That sounds pretty normal. To explain it a little, cars and planes do a lot of work during acceleration, but then they "unload" as they cary momentum. So you'll see spikes in current draw with an average being fairly low, say 15A. But with boats they are working hard practically the whole time. If you graphed yours it would be spikes at a higher average like 40-50A I bet.