Fabricate nose cone?

[NZ Sidewinder]

Older thread but will add my 2 cents worth.
For v6 motors I use some sort of internal structure to build the nose cone on.
The equivalent in the States would be a Bob's.
This is because it needs to stay in place in a turn if it hits something at high speed.
For me on a race circuit this is all about safety.
For small motors like 30hp racing which I do also, I see it as acceptable to cast polyester (reinforced bog) straight onto the gearbox.
On these small engines I don't include a Low Water Pickup in the cone but use a transom mounted pickup feeding the pump.
The trick is to prepare the Aluminium well.
I use a 36 grit sanding disc to key the bullet then butter the bullet with polyester bog.
Then a pre prepared cardboard or plastic witches hat shaped mold is filled with bog and held in place until set.
This is not an easy task.
The bog needs to be packed into the mold so that there are no air cavities.
Much easier said than done.
Once done, this forms the main shape of the cone that is then added to and finish shaped.
Done well, they dont come off.
My experience has been that polyester adheres to aluminium much better than epoxy does so if a cone is to be made from epoxy then a butter layer of polyester is used on the Aluminium.

[James45157]

try ron hill he makes some noise cones for small engines i think its hill manine 0n the west coast

[NZ Sidewinder]

Ron Hill is 15,000 miles from my place.
If I was going to make one with a integral LWP it would be of the Terminator type.

[Will hedrick]

[Will hedrick]

I hit a submarine log and ask if anyone has swept asporty, I'm not completely done but I have been working on it, boat is over a100, Noone responded as I ask if anyone had done it before

[NZ Sidewinder]

A Racing friend of mine is planning needle point cone on a small vee bottom race boat (30)hp.
We both also run V6 circuit boats.
I don't use needle points as I believe that they don't behave well in turns.
He is an ex FI tunnel driver and reckons that needle point is ok on a fast vee bottom boat?

[hsbob]

if your max speed is not near or over its a waste of time.

[PanRonnie]

Ever thought about 3D aluminium printing!
I have no idea about the cost or if it would be possible to start printing on a gearcase or seperate cone to be glued on
That is also something i would like to try but getting the right compagny would be a search