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Re: Making fibreglass nose cones

Posted: Sat Jan 26, 2013 10:45 pm
by krusty
PJR wrote:krusty I first miss read your post and came up with this idea. Thinking that you were going to make 2 sepperate halfs. the only thing that I think might help is on the finished first half is to drill 3 or 4 bolt holes into the mould before you remove it. Then when you go to make the second half fill the hole in the mould with plasticine first. Then lay up the mould, then turn the mould over and the bolt holes will give you a guide for drilling. I think this will help the 2 halfs go together better.

Rereading your post- you will just need to wax everything well just incase any resin gets down in between the nose cone and the first lay up

Phil


Hi Phil,
Yeah, I figure turning the nose cone around and re-waxing everything's the way to go.

My thinking is if I make the first-half twice over, I run the risk of having an oval-shaped nose cone.

I'll post some photos when I start :)

Krusty

Re: Making fibreglass nose cones

Posted: Sat Feb 02, 2013 12:27 am
by krusty
Ok, here's what I've been doing for the last few days :)

I've started with one of the new Estes Mega Der Red Max. This is a 4" kit and it's huge!!
MDRM-NC0-s.jpg
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The nose cone is 16.5" / 420mm from the tip to the shoulder. The shoulder is 4" / 100mm for a total length of 20.5" / 520mm
MDRM-NC1-s.jpg
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The first thing I did was to create the parting plate etc. to hold the nose cone nice and straight.
MDRM-NC2-s.jpg
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And put in supports underneath
MDRM-NC4-s.jpg
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(Continued...)

Krusty

Re: Making fibreglass nose cones

Posted: Sat Feb 02, 2013 12:32 am
by krusty
Here's the first side curing -
MDRM-NC5-s.jpg
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After two days I removed it from the board. It came away perfectly!!
I had planned on rolling the nose over to avoid having the shock cord attachment point show up but in stead I cast a big block of silicone rubber into the space instead. There's going to be a bit of a mark in the mold around the edge of the rubber but it won't matter.
MDRM-NC6-s.jpg
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And now the second side is curing...
MDRM-NC7-s.jpg
MDRM-NC7-s.jpg (178.45 KiB) Viewed 3522 times


I dyed the gel coat red for the first half and, to contrast, blue for the 2nd. It did make it easier to see where i was working :)

Now to wait!!!!

Krusty

Re: Making fibreglass nose cones

Posted: Sat Feb 02, 2013 8:40 am
by PJR
krusty great look mould. Good idea with the silicone rubber.

Phil

Re: Making fibreglass nose cones

Posted: Tue Feb 05, 2013 1:56 pm
by krusty
First nose out of the mold!

Was a bit thin (only a couple of layers of glass) so I filled it with two-part foam. Didn't add much weight - but it's now rock solid :)

Sanding and finishing next :)

3.9-inch-nc.jpg
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(Not a great photo - taken on my phone!)

Krusty

Re: Making fibreglass nose cones

Posted: Tue Feb 05, 2013 2:10 pm
by PJR
krusty great job on the nose cone :) . I did the same thing this week. On my 2.5" cones I use 2 layer of 3 oz/84g glass and they are quite strong. I wanted a light nose cone for my Sladgehammer so I tried 1 layer came out like paper. Layed up another and it came out at 27g, Happy with that.

Phil

Re: Making fibreglass nose cones

Posted: Tue Feb 05, 2013 2:18 pm
by air.command
Very nice work on the nosecone krusty! How have you attached the shock cord loop, just glued it to the side? How much does the whole nosecone weigh?

Re: Making fibreglass nose cones

Posted: Tue Feb 05, 2013 2:51 pm
by rocket_troy
Nice work Krusty.

TP