Ang.:Re: [electricboats] Sizing motor for 45-50’ boats

Of course you'll need a double bearing for axial loads in forward and reverse...

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På tir., den 16. mar. 2021 klokken 10:47, Carsten via groups.io

<Carstensemail=yahoo.com@groups.io> skrev:

Hi, Steve

Consider to make your thrust bearing with a high quality spherical roller thrust bearing, eg. of SKF brand. This can accept torsional forces much better than ball thrust bearings.

Then you don't need the expensive solutions with a lot of rubber (which needs care and replacement when worn).

The tooth belt drive (not V-belt, which introduces higher radial forces to the shaft) can be mounted either before or after the thrust bearing.

The housing for the thrust bearing should best be mounted close to the cutlass bearing, to minimize torsional bending of a long shaft.

Could you please post some photos of your existing setup of the shaft and cutlass ?

Have you considered which prop you will use for your new setup ?

Going electric has a lot of torque at low revs, which is very useful during maneuvering, so the prop should have less pitch and larger diameter, imho.

Carsten

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På tir., den 16. mar. 2021 klokken 4:52, Steven Borg

<steve@theborg.family> skrev:

I'm in the process of planning and installing a Hyper-9 motor at 154V with a battery bank of 48 280Ah 3.2V LiFePO4 batteries I received from China. The motor is rated to be plenty powerful to replace my 100 HP Diesel (which has been removed).  I'll keep everyone posted when it's installed.

In the meantime, I have a related question (maybe for ChristopherH?) around thrust bearings.  I've decided to use a belt drive (like the photos above, but for a single motor and gear.  But without the transmission I had planned on using (with integrated thrust bearings), I'm going to need to anchor the propshaft to the boat.  

Christopher, what inline thrust bearing did you use?  I'm trying to determine if I should build out a thrust bearing somewhere along the prop shaft, or whether I should integrate the thrust bearing into the engine mount, either before or after the belt pulley driving the shaft.  Also, if there's a pre-made thrust bearing for boats, I can't seem to find them (except large ones for giant ships). Does anyone know what they'd be called, so I can search for them.  (Yes, this is an embarrassing, totally newbie, question to ask, but I just can't seem to find them, so have been debating whether to just engineer my own from bearings off Granger or McMaster-Carr).

I'm not sure those questions even made sense, but that's where I'm starting...  Still trying to figure out the best way to get this done!  

This has been an amazing thread!  Thank you!