BBY MHz 44 mystic

[Chrisg81983]

Joining thread.....nice work

[RandyatBBY]

Soldered the flex shafts too late in the day to set the motor mounts ready for me in the morning
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[Chrisg81983]

Looking good randy....what size flex are u using ? Just a side note I tried outura collets on my lehner 2240/7's and there was a ton of vibrations , but when I put my MBP collets on there was none what so ever. So if you are gonna be spinning some real high rpm's I can only recommend the mbp collets. They are the only ones I will use on all of my setups.

[silver]

very nice works Randy,
i'm using MHZ collets and i'm very happy with them
IMAG2151.jpg

[RandyatBBY]

Looking good randy....what size flex are u using ? Just a side note I tried outura collets on my lehner 2240/7's and there was a ton of vibrations , but when I put my MBP collets on there was none what so ever. So if you are gonna be spinning some real high rpm's I can only recommend the mbp collets. They are the only ones I will use on all of my setups.

I will use a .002 or.003 shim wrapped around the shaft all the way and that eliminates vibrations. Thanks for the consern. It will not be a hard thing to chenge if they do vibrate. I have done this befor with good results. It is 3/16 flex shaft

[RaceMechaniX]

Randy,

I will second the vote to switch to the MBP collets. They run exceptionally true with no vibration. They also have the best grip of any two piece collet I have used thus far. I have spun them over 50k RPM with no problems. If you need to use shim stock that would be my first red flag.

TG

[RandyatBBY]

Randy,

I will second the vote to switch to the MBP collets. They run exceptionally true with no vibration. They also have the best grip of any two piece collet I have used thus far. I have spun them over 50k RPM with no problems. If you need to use shim stock that would be my first red flag.

TG

This build was to have all German parts in it, the collets from MHZ were missing. This is a customers boat and a lot of the final decisions are up to them. Do you have a link to the MBP collets? I really like the Hydro Marine collets. I think I do know the MBP ones the web site has a funny picture of the owner??? I respect all your inputs, But I have ran in the high nineties with this method (Octura couplers) too.

If it was my boat I would not use the Bulk head motor mounts. I really never leave only one motor in my boats. Really in my Opinion I prefer the HPR hardware over this MHZ PIA to install and maintain hardware.

[RaceMechaniX]

Randy,

Here is the link to the "expert line" of hardware that MBP produces. http://mbp-rc.de/MBP

You can also order them stateside from Rocket City Racing. http://www.rocketcityracing.com/MBP_bymfg_89-3-1.html

TG

[RandyatBBY]

Ya that is the web site I was thinking of. Thanks, I will forward the info to my customer.

[Chrisg81983]

Mbp gets me my orders from him to new york in a weeks time. Brian at rocket city is great to deal with as well. I cant stress how precise along with how nice those collets from mbp work. .......

[RandyatBBY]

Yes we are going with the MBP couplers it is confirmed.

[Chrisg81983]

Good choice

[RandyatBBY]

Brian is out of them and we are waiting for them to be received in stock.

We should talk props a little I was planning on cutting down a set of X447 right and left to start with, but really like the three blade props in right and left. It is impossible to be up on every prop in the world so I am open for suggestions. I now that the 4516/3 was mentioned before I think it is a ABC. I will be at the races tomorrow so we have time on this too.

[Chrisg81983]

A 47 is what I got my 104 mph pass with but I also run a set of 47's cut to 44 with some mods to it. Your 2250's will turn a 47 no problem. If u want a 3 blade go with 4516's they're a great set of proos but just watch set-up closely at first as they do load the motors much more. A prop size just a tad to big really can make Amps go through the roof.

[nata2run]

I have spun 648/3 450/3 and 457 cut to 52 on those motors but on low rpm! And in a 54" hull aswell. But they were in wye mode and 8s max with 448/2. If running in delta on 4s you are already in the mid 30k' on 5s you should be fine with a 447 but 6s is pushing it extremely!! Your amps will be through the roof and any normal ESC will most likely fail. I would restrict this setup to 5s with 442-447' for speeds up to around the 100mph mark. If setup up properly and with big ESC's on 6s, you could be around the 115mph with the right prop.