Stingray Build

[RCnut]

Ahh well, Your knowledge on this is way over and above my own. I did try Gelcoat in a rubber mould a few years back and it came out very tacky so never did that one again. lol.

[Subculture]

I haven't heard of that technique before. It's not generally recommended to use gelcoat in rubber tools anyway. I've not seen a reason given but I would guess that shrinkage of the resin as it cures results in the resin moving away from the rubber tool, and as the resin is air inhibited it wouldn't fully cure. So they tend to recommend mixing a thixo additive e.g colloidal silica with normal lay-up resin and using that instead.

[RCnut]

Polyester resin mix with some polyester filler to give it body, then Fibreglass matting to give strength, I prefer this over Gel coat as it weathers the knocks better than Gelcoat and dosnt crack a few years on. Just my own opinion you understand.

[Subculture]

Do you use Epoxy or Polyester resin?

[RCnut]

Well as it turns out my fibreglass was with my good neighbour so I'm in business lol. Rubbers all on and just letting it go off and do the jackets tommorrow morning, Good thing I'm on holiday.

[RCnut]

Yeah, had to make a parting mold-board as I was dealing with a full-up hull casting. Great minds think alike. You're already deep into the rubber end of things. Wow. I better get hot on that PJ valve I bragged about above ...

David

Yep, lol. Well if all goes to plan and my fibreglass resing gets here tommorow I can see me doing a pull sooner than the weekend. Phew!

[He Who Shall Not Be Named]

Yup, the only difference here is tha your making a two part mould (From what I see) I have it a bit easier as mines in two parts. My Sky1 is done as you have shown there. My Glove will be made of Fibreglass for strength. Oh BTW First pour is on.

Yeah, had to make a parting mold-board as I was dealing with a full-up hull casting. Great minds think alike. You're already deep into the rubber end of things. Wow. I better get hot on that PJ valve I bragged about above ...

David

[RCnut]

There you go.

[RCnut]

Yup, the only difference here is tha your making a two part mould (From what I see) I have it a bit easier as mines in two parts. My Sky1 is done as you have shown there. My Glove will be made of Fibreglass for strength. Oh BTW First pour is on.

[He Who Shall Not Be Named]

By 'neat' I assume you mean first applications of RTV straight out of the can, thin -- to minimize bubble entrapment, then build up with thickened rubber? What nominal wall thickness to the glove element do you shoot for?

Will you make a rigid 'mother-mold', or backing strong back to back up the rubber tool against the sagging that results from gravity and such?

I got permission from the originator of the smaller resin STINGRAY to make my own tool for a GRP copy -- here's how I did it. The brown stuff is the gel-coat and glass lay-up done to creat a backing mother-mold. It worked but if I had it to do over again I would have made the rubber element (the glove mold in local language) thicker.






David

[RCnut]

Last pic of masters before the first pour of rubber. The white walls are simply to hold in the neat rubber and build up a solid edge, after 3 pours of neat I add a thixotropic agent and butter the rest on.

[RCnut]

I say again: You are a machine!

David

Lol sometimes I wish I was.

[He Who Shall Not Be Named]

Well the way I see it is that this model build was posted on 4 different forums and facebook. Most people will know its mine and thats all I can expect. On a lighter note the moulds for the resin parts have been done apart from the large top fins, ran out of rubber. More coming on wednesday so will do the rest then. hope to get a pull over the weekend.

I say again: You are a machine!

David

[He Who Shall Not Be Named]

Perhaps they can choose to go in the cube?

HA! Someone got it!

I hear Caswell will soon be stocking bulk Razor-wire. When not modeling I tinker with Trap design.

David

[RCnut]

Well the way I see it is that this model build was posted on 4 different forums and facebook. Most people will know its mine and thats all I can expect. On a lighter note the moulds for the resin parts have been done apart from the large top fins, ran out of rubber. More coming on wednesday so will do the rest then. hope to get a pull over the weekend.