Fitting a nose cone with Durafix or Technoweld etc ?

[phillnjack]

I know there is lots of topics on the internet about nose cones being welded on and epoxied on etc.
But here is a slight different take on this,
I would like to know as I am a total disaster when trying to weld aluminium. yes I can make wonderful shiny looking art objects from
something that should realy be a square box etc, I cannot get to grips with the point of weld or puddle. cant trust myself with welding alloy.

So now I am thinking about using some of the other type of rods that work without the original material turning into said puddle.
I did weld a few alloy pipes with this stuff years ago and no way can I get them off the metal I joined them too (small alloy 2stroke cylinder head ).

the temp of most of the propane type welding seems to be around 400 to 700 deg centigrade, a long way off the alloy melting point of a gearcase.
if this would be strong enough it would be the safest thing for me to attempt ( notice attempt !!!).
I would feel so much happier if I could do it this way myself, and would like to do this myself as I will be making my own cone for the motor.
just a sandcast job then spend a while grinding it to a reasonable finished item.
the things I have looked at are below, with these I could put a cone on with a high temp heat gun instead of using flame (my alloy puddle maker)
as the temp is just around 400 to 500 deg centigrade for most of these rods with some upto 700 deg c .
my electric heat gun can get alloy to 600 deg c no problem.

what are your thoughts on this stuff to hold on a nosecone on a 3 cylinder Omc 56 cu in ?

Durafix,

https://www.youtube.com/watch?v=n1njyuPBIH0


or this one Techoweld as below on you tube


https://www.youtube.com/watch?v=nxtm...32A7E785F5B696

[David]

A nose cone would slow your boat down.

[phillnjack]

A nose cone would slow your boat down.

slow it down ?

I am not disbelieving you, but could you explain that a bit please.

[FORBESAUTO]

If you are surfacing you'll be fine and probably will pick up. What he is saying is that if you are not going fast enough for the blunt nose to cause blowout, the extra drag of the longer case being submerged could slow you down. If you surface it, it's not a problem and the longer case actually can provide some extra lift. So depends on how your using it. I've always had mine welded because like you I can't weld aluminum. Don't want that joker to come loose at speeds.

[XstreamVking]

Always wondered about using some plexus panel adhesive for bonding a nose cone. I have a epoxy torque tab build up on my gearcase and no problems with it de bonding over the 5+ yrs it has been in use. This is the stuff...
http://www.itwplexus.com/materials/metals.cfm MA832 product might be the best?

[phillnjack]

Dont know if it makes a difference but I was not thinking of making one of those great big things that go to the top of the gearbox,
I was thinking more on the lines of the small ones that just make the nose a bit sharper and a touch more streamlined.

like this one Below. thats why I was thinking of the Durafix or Techno weld type stuff.
But if it will slow me down then no way do I want one.

[FORBESAUTO]

That's not adding all that much so may work? Epoxy that sucker on there and see what happens, you never know until you try it. If hurts you since it's epoxied on, grind and take it off. All set ups vary. Sometimes what's supposed to work doesn't and what doesn't supposed to, works great.

[David]

3 cyl OMC, speed in the 40's?
Nose cones add length which adds friction with a submerged gear case. A nose cone will reduce the
likelyhood of blowout at over 80 mph and normally allow higher engine heights.

[phillnjack]

My boat dont see 80 even on its trailer ha ha .

will have to re-think it again now, just thinking of hydrodynamics playing a part.
might see if I can make one that I can just put it on and off when I like etc.