54" Bonzi Fountain build

[Checkmateguy01]

Very nice!! Even at half throttle it's crossing some water quick! I can't wait to see some full throttle passes!!

[ScarabChris]

Very nice!! Even at half throttle it's crossing some water quick! I can't wait to see some full throttle passes!!

Yeah me either. I need to figure out why that one ESC is shutting down. I'm wondering if the battery on that ESC was not fully charged because it didn't shut down the first time I tested it. But then again that ESC was hot....151 degrees!!

These are Hobbywing 180 Marine's. How hot should they get at an acceptable load?

[ScarabChris]

Well I ran the boat again this morning. After setting the timing on the ESC and adding my extra "custom" cooling the boat ran great. The thing was screaming! Not shutting down.

Everything was great until........I lost a shaft and prop!!

I am blown away. It was the solder joint that came undone. OK no big deal it happens. But these MHZ drives have a little set screw in the drive and when you screw it in the screw protrudes into a groove on the shaft to prevent it from slipping out.

The pics show the screw is still in place but I lost the shaft anyway. I even played it extra safe and put collars on the shafts in the hull.

To hell with these solder shafts. I'm going to get the 1/4" flex shafts that have the prop shaft welded to it.

But anyway...before the boat lost the prop and shaft she hit 52 MPH! That was with just a tiny burst of full throttle. If I hold the throttle down for more than 1-2 seconds the boat gets lose and wants to fly. I still need to trim it out. Once she is trimmed and I can hold full throttle for a while I think it will pass 60.

[forescott]

Very nice! I like what you did with the esc cooling. One thing I notice from your pics, not a big thing, but I would replace those t-fittings with the y=fittings that ose sells to get a more even split of water. Great job!

[ScarabChris]

Those T fittings you see are just for the flushing system. If you look above them you can see 4 hose barbs that are capped off.

I run in salt water so as soon as I'm done running I have a little flush rig that connects the hose to all 4 cooling systems.

[dasboata]

Chris great job on the boat glad you finaly got her running right !!!!! I would try to remove the skegs on the drives !!! well good luck thanks chris

[ScarabChris]

OK.....I got some props and shafts back in this boat. I went with the Hughey shafts to eliminate that solder joint. But the MHZ drive was bigger inside than the standard 1/4" shaft so I got some shaft bushings like this......

http://www.gizmomotors.com/index.php?page=shop.product_details&flypage=flypage_images.tpl&product_id=73&category_id=9&option=com_virtuemart&Itemid=56

Worked perfect. In fact I think its even smother than the original MHZ shaft.

The props I got from DasBoata, these are some sweet props, all modded, sharpened and balanced. I'll cry if I loose one of these. I did a quick test run in the canal behind my house and I can tell the boat is going to be faster with these props. Tomorrow we will see.

Now some finished pics.......

I switched to the black cooling line, I think its a much cleaner look.

Take a look at those prop nuts. The prop hubs are thin so now the prop nuts look huge. Anyone know where I can get a slimmer prop nut or bullet nut?

[ScarabChris]

Few more pics.....

[monojeff]

OK.....I got some props and shafts back in this boat. I went with the Hughey shafts to eliminate that solder joint. But the MHZ drive was bigger inside than the standard 1/4" shaft so I got some shaft bushings like this......

http://www.gizmomotors.com/index.php?page=shop.product_details&flypage=flypage_images.tpl&product_id=73&category_id=9&option=com_virtuemart&Itemid=56

Worked perfect. In fact I think its even smother than the original MHZ shaft.

The props I got from DasBoata, these are some sweet props, all modded, sharpened and balanced. I'll cry if I loose one of these. I did a quick test run in the canal behind my house and I can tell the boat is going to be faster with these props. Tomorrow we will see.

Now some finished pics.......

I switched to the black cooling line, I think its a much cleaner look.

Take a look at those prop nuts. The prop hubs are thin so now the prop nuts look huge. Anyone know where I can get a slimmer prop nut or bullet nut?

I have heard bad stories of people using the bullet nuts.
The zubers may not look pretty but you certainly do not want to loose those props.
Awesome how chris thins the hubs & his prop work is second to none.

[ScarabChris]

Yeah I was thinking that with the bullet nuts, they look sweet but no nylon lock to keep it in place. Then again I have always used the bullet nuts on my gas boats and never lost a prop. Some of them have set screws.

But you're right, why take the risk and loose an 80 dollar prop over a 3 dollar bullet nut.

Then how about some smaller diameter nuts. I know they exist I just can't find them.

[Make-a-Wake]

Hi Chris, nice work! Some vid at WOT would be really great!

BTW, am i seeing the tubing correctly that you have it running to the motor first then the esc? If so, that could be why your ESC has been getting warm/hot. ESC shouyld always be first from what i've learned.............thats how i run mine.

[ScarabChris]

Thanks!

Each ESC and motor has its own cooling. There are 4 separate cooling systems in the boat. If you look at the pic of me flushing it you will see water spitting from 4 locations.

[ScarabChris]

I have a buddy coming over tomorrow to shoot video.

[Brushless55]

I dig the heat shrink on your lipo packs

[ScarabChris]

Ha! Its just diamond plate decal sheet. I thought it would look cooler than blue. I also have carbon fiber decal sheet. I'll do the other set of batteries in that.