Making fibreglass nose cones

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Re: Making fibreglass nose cones

Postby Scoop1261 » Mon Dec 24, 2012 12:39 pm

Great stuff!

8)
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Re: Making fibreglass nose cones

Postby CATO » Mon Dec 24, 2012 1:35 pm

Looks great Phil...
"In thrust we trust"

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TRA 07459 L3

Impulse:
2019: 14,725 Ns (44% N)
Ns 18: 14,767; Ns 17: 5,973; 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: M1.14

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Re: Making fibreglass nose cones

Postby Kryten » Mon Dec 24, 2012 3:49 pm

Nice work.

I think we should have a caption contest for this pic:

Image
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Re: Making fibreglass nose cones

Postby Grejoh » Mon Dec 24, 2012 7:58 pm

God there must be an easier way to precharge these dam air rockets!

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Re: Making fibreglass nose cones

Postby Lamp » Tue Dec 25, 2012 5:44 am

Great stuff Phil, thanks for taking the time to document and photograph the procedure. I have never seen how to do this kind of stuff before so it was fantastic to see the process, especially how to do the seams.


Kryten wrote:Nice work.

I think we should have a caption contest for this pic:

Image


How about
"Now just keep the balloon inflated until the epoxy sets"
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Re: Making fibreglass nose cones

Postby PJR » Tue Dec 25, 2012 7:31 am

The ACME nosecone insert balloon and expand

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Re: Making fibreglass nose cones

Postby CATO » Tue Dec 25, 2012 9:38 am

Phil,

It's only illegal if you inhale...
"In thrust we trust"

AMRS 21 L3 RSO
TRA 07459 L3

Impulse:
2019: 14,725 Ns (44% N)
Ns 18: 14,767; Ns 17: 5,973; 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: M1.14

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Re: Making fibreglass nose cones

Postby cryoscum » Tue Dec 25, 2012 9:54 am

"Jar-Jar Binx catches what he thought was lunch"
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Total impulse for 2016: 32,458 Ns (thus far)
Total impulse for 2015: 84,231 Ns
Total impulse for 2014: 40,757 Ns
Total impulse for 2013: 62,927 Ns

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Re: Making fibreglass nose cones

Postby krusty » Tue Dec 25, 2012 10:30 am

blow damn it.jpg
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Re: Making fibreglass nose cones

Postby PJR » Wed Dec 26, 2012 9:45 am

1 last comment on the nose cone. If you use the peel ply remove it from the nose cone before you separate the mould as you can damage the nose cone try to get the peel ply out when it isn't in the mould - on lighter nose cones.

The above nose cone I used 2 layers of glass, 2.5oz at the nose and 2.5oz up to the shoulder and 4oz on the shoulder Weight of the nose cone is 37g

the first nose cone I used 2 layers of glass, 2.5oz at the nose and 4oz up the the shoulder and 6oz on the shoulder. Weight of the nose cone is 44.5g

2.5oz = 84g
4 oz = 130g
6 oz = 195g
well thats how Adelaide Moulding & casting Supplies sell it?

Phil

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Re: Making fibreglass nose cones

Postby CATO » Wed Dec 26, 2012 3:42 pm

Hi Phil,

Where did you purchase the Gel Coat and the Royal Blue dye?
"In thrust we trust"

AMRS 21 L3 RSO
TRA 07459 L3

Impulse:
2019: 14,725 Ns (44% N)
Ns 18: 14,767; Ns 17: 5,973; 16: 34,558; 15: 35,955; 14: 6,016; 13: 10,208
PB - Gorilla N2717WC, H: 10,260', S: M1.14

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Re: Making fibreglass nose cones

Postby PJR » Wed Dec 26, 2012 4:49 pm

CATO in wollongong we have a store called the yacht shop which has some fibre glass stuff and yachting equipment. I think you should be able to get it from any boating/repaire shop. The gell coat I have dosen't have a brand name on it. I think it was decanted from a big tin and a lable stuck on it

Phil

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Re: Making fibreglass nose cones

Postby flyonline » Sat Dec 29, 2012 1:47 pm

Nice one!

If I may add a couple of suggestions. Firstly if you make up a template for your fabric, you shouldn't have to cut it with the scissors before you join the two halves. I build RC planes, and they're much more complicated than a regular shape like a nose cone. Lay down strips of masking tape in the mold, shave along the edge with a sharp knife/razor blade and then remove and transfer to template material (thin ply, mylar, mdf etc.) and add your overlap on one side. If you use a roller cutter and the template, you can stack cut a number of layers at once and save a lot of time.

If you have trouble with the pieces pulling/fraying, a very LIGHT mist with hairspray will keep it tight, but still allow a bit of movement to get into corners.

There is also a method of using a bladder to squeeze every last drop of excess resin from the part and you don't need to push the seams down as the bladder does it for you (not so much of a problem here!). If you want some more info, sing out and I can point you in the direction of a few videos.

Steve

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Re: Making fibreglass nose cones

Postby krusty » Fri Jan 25, 2013 1:49 pm

I left work early last night and stopped at Barnes on the way home.

I dropped a handfull of cash on the counter and walked away with a box full of tubs and tins and goo and what-not.

My goal this weekend is to turn a nice big 4" nose cone into a 2-part mold just like yours!!

There's a challenge - my nose cone has a shock cord attachment point moulded into the shoulder of the cone. I don't want this on the finished mold so when I get done doing the first half, I'm going to extract the nose cone, turn it around so the shock cord attachment is in the completed half and then continue... (I plan to call it 'a learning experience' if I bugger it up...)

Krusty

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Re: Making fibreglass nose cones

Postby PJR » Fri Jan 25, 2013 4:42 pm

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


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