GX390 Boat Build

[Mammoth]

Did the die break or the shaft?

Some of the teeth on the die broke. Luckily I was able to get the die off without damaging the threads on the shaft.

 

[65ShelbyClone]

What grade of titanium are you using?

Using big ol' taps and dies on Ti is really going about it the hard way and I get it, it's out of necessity. It would be a lot more cooperative with single-point threading in a sturdy lathe. It has some similarities to stainless steel.

 

[Mammoth]

What grade of titanium are you using?

Using big ol' taps and dies on Ti is really going about it the hard way and I get it, it's out of necessity. It would be a lot more cooperative with single-point threading in a sturdy lathe. It has some similarities to stainless steel.

Yeah, single point on a lathe is a much better way to go for this type of job. Carbide vs Titanium.
I don't have access to a lathe right now, so I'm just getting by at this moment in time.

Its 6AL-4V Titanium

 

[Mammoth]

Had to match the propeller shaft tunnel to the front of the propeller.



Got a tube and bored the inside to accept a seal. This will actually be a second seal to keep water out of the hull.



Had to go right here.



Then welded the tube to the propeller shaft tunnel. I battled everything imaginable to get it welded.



Still working on smoothing out the seams, but it should have a lot less drag like this.

 

[Wicked_Daddy]

Read this whole thread. Fascinating! Can't wait to see it on the water.

 

[Mammoth]

Was able to get the tunnel sealed up, and a simple lightweight footrest installed.

 

[Edwin Spangler]

SUH-LOOT! I cant imagine starting on that first bead, knowing how much more was left. Jeeeez!

Nice work man.