Search found 395 matches

by joeman
Mon Jan 06, 2020 4:53 pm
Forum: Scratch Built
Topic: Thunderbird 3 Build
Replies: 12
Views: 921

Re: Thunderbird 3 Build

My son likes the look of your project. So do I [emoji3]

Looking forward to seeing it progress.

Joe


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by joeman
Mon Dec 23, 2019 10:18 pm
Forum: Low Powered Rocketry
Topic: 3d Printed Rocket for D and E Motors
Replies: 5
Views: 1283

Re: 3d Printed Rocket for D and E Motors

Really awesome. I like post with all close up photos of the parts and the designs. I have a few questions... * What filament did you use? ABS plastic? * What sort of fill did you use? 15% or more? * Any other (non-default) settings set for the print? I once used 3-D printer to create parts for "...
by joeman
Thu Dec 19, 2019 3:31 pm
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 5461

Re: Building a CF Tube

Hi,
I'm after Fibreglass Tow - 12k, or possibly 24k.

So hard to try and get hold of this stuff. Anyone suggest a supplier?

It is to wind the Payload bay and the couplers.

Cheers

Joe
by joeman
Sun Dec 08, 2019 8:41 pm
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 5461

Re: Building a CF Tube

Today, I trimmed some of the ugly bits off the Nosecone. See below. IMG_0200_Trimmed_sml.jpg More to trim off later on.... Because the orientation of the Carbon Fiber is 23 degrees for the cylindrical section, if squeezed (at the very base), it deflects ~1 to 2 mm MAX. Higher angles would have resul...
by joeman
Sat Dec 07, 2019 6:25 pm
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 5461

Re: Building a CF Tube

Why stop at at winding an Air-Frame? Why not wind a Nose Cone as well? Finally! After a lot coding and lots of 3-D Prints (for Nosecone Mandrel), I've wound a Nose Cone for this rocket. I had done heaps of testing and founds lots of little bugs (in the code) that mis-aligned the CF, but eventually g...
by joeman
Sun Nov 10, 2019 12:42 pm
Forum: Thunda Down Under 2019
Topic: Lost rockets page
Replies: 7
Views: 2227

Re: Lost rockets page

Darn!


Gives one hope though. [emoji3]

If you see a 38mm with yellow nose let me know [emoji3][emoji3]

Thanks Kopius

Cheers!

Joe


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by joeman
Sat Nov 09, 2019 10:22 pm
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 5461

Re: Building a CF Tube

Thanks for your suggestions. Haven't got to sorting out the finish. I've been starting on the next thing to wind.... (while I ruminate over the way to "finish" the air-frame). tYUCwCxzbCg Code is VERY experimental... a lot of work to get it to do a "proper" wind job. I'm thinking...
by joeman
Sat Nov 09, 2019 10:14 pm
Forum: How to's
Topic: Down Draft Table
Replies: 15
Views: 2307

Re: Down Draft Table

I've always been paranoid about dust when sanding.

Sounds like a very good idea.

Looks very professional!
by joeman
Sun Oct 06, 2019 10:41 pm
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 5461

Re: Building a CF Tube

Thanks guys for support - and advice. Hi Air-Command At first I didn't like the idea of getting rid of the nice CF pattern, but that idea of having microballoons softer surface means it will sand preferentially to the CF, which means easier to get that perfect looking cylinder. (After winding this t...
by joeman
Sun Oct 06, 2019 11:01 am
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 5461

Re: Building a CF Tube

Ok, some measurements.... Weight of Tube: 1400 grams Weight of Carbon Fiber used: 700 grams So 50% Epoxy, 50% Carbon Fiber. I'm pretty happy with this. I'll measure thickness later on, after I cut the ends off. I will be adding some Epoxy to exterior, so it will go back the other way, but I need to ...
by joeman
Sun Oct 06, 2019 10:13 am
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 5461

Re: Building a CF Tube

After several hours of prep, 2.5 hrs of winding, 1.5hrs clean up, a few scares and some sweating getting it off, I finally got a 4 layered 2 m tube!! IMG_9612.JPG IMG_9613.JPG During removal we had three blokes pulling... not moving much, then suddenly it started sliding easily!! I’m glad I had some...
by joeman
Sun Oct 06, 2019 9:58 am
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 5461

Re: Building a CF Tube

I’m not sure Strud. Never seen it. I was going to ask the supplier and then forgot.

It would be handy


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by joeman
Mon Sep 30, 2019 8:38 am
Forum: Scratch Built
Topic: Free Form Fins - CP Issues - OpenRocket
Replies: 6
Views: 1098

Re: Free Form Fins - CP Issues - OpenRocket

I haven’t experienced this. Did dragging away from centre line also cause a reduction? (Not that you would want to in real life). I would expect this to increase area of fins and so increase stability. Have you performed drag/stability analysis? Ie over range of speeds... rather than just at mach 0....
by joeman
Fri Sep 13, 2019 12:26 pm
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 5461

Re: Building a CF Tube

Previous tube of about 1.8m (that I couldn't remove) took 2 hours. So probably about 2hrs 15mins to roll a 2 meter Carbon Fiber tube - 4 layers. The K3600 doc (from memory) says a pot time of 90min +/- 10min at 25 degrees, that number means nothing up here in Cairns where it is 30+ in the workshop. ...
by joeman
Fri Sep 13, 2019 11:09 am
Forum: How to's
Topic: Building a CF Tube
Replies: 56
Views: 5461

Re: Building a CF Tube

Cheers!

About 0.6mm thickness. About what I expect for 12k.

Been a slow journey.


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