Home made propeller

[Glenno]

Hi all,
I am giving making a tubed cleaver for a 8hp Tohatsu a go.
Chopped blades of one of my Johnson 25hp stainless props and re-shaped, still a bit of fine tuning on blade shape to go.
Will make a jig and pitch block to weld blades on at 13 pitch and low rake.
Will keep pictures comming.

[Glenno]

Hi all,

I Have added a trailing lip to the blades, they all still need to be sharpened and polished.
I have also started on a pitch block (I decided it does not need to be that pretty as I will only be making one of these props)
I have weighed each blade and they are within 1gram (I will also ballance the prop once it is all together somehow)
I am gauging my pitch block off 3 props I have here which are all 13 pitch.
Although I have played, re shaped, modified heaps of props I have never made one from scratch so I am no expert at this, I know full well this could fail but would love any information or help from anyone who has done this before.
Just something I am enjoying playing with.
Cheers,
Glenno

[Fastjeff57]

Another nut like me! (Made several that way.) Be sure to leave LOTS of fillet where the blades are welded to the hub. (I didn't once and--whamo!--the blades broke off.)

Jeff

[Roflhat]

Awesome project

[zul8tr]

Quite a nice project. Do those blades have progressive pitch from leading to trailing edge at any given radius or a constant pitch at any given radius? If progressive pitch how will you get your desired 13" pitch?

[Glenno]

Hi mate,
Yep the blades are progressive pitch the whole way up the blades.
It will be 13 in the centre. I have three props here that are 13 pitch which I am modeling my pitch off, two of those props are progressive pitch.
If I get the pitch a bit wrong hopefully I go down not up, 12.5 would be fine but I am not sure how above 13 would go without modifying the little motor a bit.
If this prop is a failure, hopefully it looks cool and I will put it in my wife's display cabinet to man it up a bit!
Cheers,
Glenno