Looking for someone to finish set up of my MHZ Mystic 114

[pberzins76]

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[fweasel]

Those are Franz's collets, very nice stuff. I'm running those on my Exocet.

[pberzins76]

Yep, those are them!

[pberzins76]

Got a couple more runs on the boat with the new collets. Had a real nice long run last Sunday, and I was feeling really good about things... Ran real well, and very very fast. Almost ten minutes of running time, and everything running just lightly warm...Fast forward to yesterday. I ran the boat again. and was running fine for about five minutes. until I had another flex shaft bond failure. This is now the second MHZ Flex cable that their glue bond of the flex to hard shaft failed. Lost yet another prop. Quite disappointed and not happy with MHZ at all. Rewind about two weeks ago. I contacted MHZ regarding concerns about the glue bonds between the stuffing tube supports and the hull. The bonds have a lot of movement in them, and feel like the bond is separating from the hull. MHZ requested to see the issue, and I sent them a video. They replied that the glue they used must have been open for too long and didn't cure right. They offered to give me a voucher and some "free" glue to fix it, though they sent a message a day after saying they just realized they can't send glue to the US. Chatted to some people on a MHZ/HPR owners group on Facebook and posted the video there for them to see. Got various replies, from "this is normal as it's supposed to be a flexible joint" to "more proof of bad quality control; tear it all out and re-glue everything." Don't know what to do at this point. Back to the flex cable issue, I contacted MHZ again and awaiting what their response will be this time. Probably more of the same I'm sure. One thing for sure, I'm not going to keep spending $100.00 on new shafts from them (plus replacing props) if these things keep failing after a few runs....Nor am I going to buy another boat from them ever again, as they failed to deliver all the way back to when I first received the boat. Anyone have any input feedback, please feel free to share.

[Silver954]

What's the steps you went thru to glue the flex to drive shaft?

[pberzins76]

They were glued by MHZ. Already Screenshot_20220925-155513_Chrome.jpgassembled flex shaft assembles

[Silver954]

It's more of a do-it-yourself hobby. Now you know the gluing job is not 100% so all shafts need to be redone. Burn off the glue and separate the flex shafts. Grind the flex ends, use a drill bit to clean the shaft holes. Burn off and clean everything. I use Loctite 648 retaining compound. Google how to burn off retaining compound.

You should get good at surface prep and gluing. You won't bat an eye pretty soon and won't loose any parts either. Good luck!

[vvviivvv]

Try Mcorp for some shafts....

Unfortunate the decline in MHZ quality. It's not supposed to be a flexible joint if everything is correctly lined up. just bad quality again.

- I can sell you a nice Hpr C5009 if you can get your money back from MHZ, it's a bare hull currently. haven't marketed it yet but it's a genuine HPR hull that's been over 120mph (200km/h+) at the munich SAW event.

[Silver954]

Nice how big is that hpr?

[vvviivvv]

Same as the MHZ, 115cm approx.

[pberzins76]

https://youtube.com/shorts/umoYqAfjbO8?feature=share

[pberzins76]

Above is the YouTube link to the video of the stuffing tube movement I mentioned in my previous post today.

[Silver954]

Yea that's coming undone from the hull. Poor surface prep likely. Gotta remove it and start over.

[pberzins76]

Well, as much as I didn't want to (and dreaded having to do), I took apart my boat to properly redo MHZ's shoddy workmanship. I removed the stuffing tubes, and supports. Needless to say though, it took no effort to pop loose the supports. Just as suspected, there was absolutely no prep to the hull when it was assembled at MHZ, so nothing adhered properly. Surprised the whole thing didn't catastrophically fail while I was running the boat all this time. In the process of pulling out the port stuffing tube, the tube split open on me, but I happened to have a brand new pair of replacement stuffing tubes that MHZ sent me in error when I last reordered new flex cables. So I re-bent a new stuffing tube. Will install a new one on the starboard side as well. I also popped out the water pickups, and will properly glue in new ones. I'm thinking of omitting using the oiler/bearings on this redone setup. Probably not necessary, as I don't use them. What you guys think? Any practical need to have the bearing on the tube?

[pberzins76]

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