Search found 2416 matches

by OverTheTop
Thu Nov 16, 2017 6:58 am
Forum: Higher, Faster, Further
Topic: Vertical Trajectory System (with some 3D printed parts)
Replies: 32
Views: 3482

Re: Vertical Trajectory System (with some 3D printed parts)

Airframe Integration With the completion (sort of) of the main assembly, time to integrate it into some fiberglass airframe. I had some 4” airframe sitting around so I pressed that into service for this module. It was just about the perfect length to start with! A bit of measuring and thinking and ...
by OverTheTop
Tue Nov 14, 2017 7:17 am
Forum: Scratch Built
Topic: bodytube inner surface and ejection charge - heat protection
Replies: 12
Views: 209

Re: bodytube inner surface and ejection charge - heat protection

Use Glad Bake (accept no substitute) as the cooking paper and you will have no problems. I use it all the time.

There are numerous threads here where people have, to their detriment, used other brands during builds.
by OverTheTop
Mon Nov 13, 2017 6:11 pm
Forum: Scratch Built
Topic: bodytube inner surface and ejection charge - heat protection
Replies: 12
Views: 209

Re: bodytube inner surface and ejection charge - heat protection

Not sure if polyester was a bad choice. I have no experience with it. Anyone else experienced problems with polyester resin being damaged by ejection gases?
by OverTheTop
Sat Nov 11, 2017 8:15 pm
Forum: Scratch Built
Topic: bodytube inner surface and ejection charge - heat protection
Replies: 12
Views: 209

Re: bodytube inner surface and ejection charge - heat protection

I have not observed any damage to my fiberglass from ejection charges.

As has been said, a coating of epoxy would be a reasonable fix.
by OverTheTop
Mon Nov 06, 2017 7:33 am
Forum: Electronics
Topic: Altimeter on the pad Fail
Replies: 7
Views: 222

Re: Altimeter on the pad Fail

I wear eyeglasses so I get the protection there by default. If I need to focus in close I swap them for safety glasses. As snrkl said, you only get two eyes. Hearing protection when carrying a rocket, especially on your shoulders, is also a good idea. A few people have had their hearing downgraded b...
by OverTheTop
Sun Nov 05, 2017 3:46 pm
Forum: Rocketry Control Room
Topic: Arnhem Space Centre
Replies: 12
Views: 361

Re: Arnhem Space Centre

Somebody recently posted this video about Wallops, from back in the 60's, on TRF.
by OverTheTop
Sun Nov 05, 2017 9:48 am
Forum: Mid/High Powered Rocketry
Topic: Joe Turners L2 Build Thread
Replies: 66
Views: 1401

Re: Joe Turners L2 Build Thread

Looking good Joe. I like the idea of easing off on the shrink tubing to encourage the wire to bend where you want it, although I have not found it necessary when I use a similar setup in my electronics bay. It may benefit your installation though. I would add some heatshrink to the threads on the al...
by OverTheTop
Fri Nov 03, 2017 4:09 pm
Forum: Rocketry Control Room
Topic: Arnhem Space Centre
Replies: 12
Views: 361

Re: Arnhem Space Centre

That's great news Blake. Glad to see some local involvement in the setup too. You must be pretty pleased about that 8)
by OverTheTop
Mon Oct 30, 2017 11:18 am
Forum: Electronics
Topic: Altimeter on the pad Fail
Replies: 7
Views: 222

Re: Altimeter on the pad Fail

Interesting. Any telemetry on your rocket?

I have had the NC blow of a rocket on the pad once. In my case it was an internal electromagnetic compatibility issue between the altimeter and my telemetry transmitter.
by OverTheTop
Sat Oct 28, 2017 9:42 am
Forum: How to's
Topic: Attaching shock cord to hollow nose cone
Replies: 10
Views: 766

Re: Attaching shock cord to hollow nose cone

I have learnt that it is not only the HDPE itself that is unbondable. It is more about that the HDPE details are covered with release agent. It is not possible to clean them just with solvent but with flame treatment + alcohol cleaning. I had similar issues bonding CF sheet to an ABS printed part. ...
by OverTheTop
Wed Oct 25, 2017 9:26 am
Forum: Higher, Faster, Further
Topic: Vertical Trajectory System (with some 3D printed parts)
Replies: 32
Views: 3482

Re: Vertical Trajectory System (with some 3D printed parts)

You planning to have cameras setup so you can monitor actual movements?


Not at this stage, but it would not be too difficult to tape a couple of 808 keychain cameras to the airframe. I will see what happens between now and launch.
by OverTheTop
Wed Oct 25, 2017 6:59 am
Forum: Higher, Faster, Further
Topic: Vertical Trajectory System (with some 3D printed parts)
Replies: 32
Views: 3482

Re: Vertical Trajectory System (with some 3D printed parts)

Hi Strud. Thanks for the comments. I have been considering if there is any way of actually testing, with anything other than short-term rotations, the behaviour of the assembly. The short answer I think is "NO". Given this uses a commercial autopilot and so I have no way of tapping into th...
by OverTheTop
Mon Oct 23, 2017 6:02 pm
Forum: Higher, Faster, Further
Topic: Vertical Trajectory System (with some 3D printed parts)
Replies: 32
Views: 3482

Re: Vertical Trajectory System (with some 3D printed parts)

Showing Restraint As mentioned earlier, the AP needs to be vibration isolated from the airframe with foam pads, and it needs to be restrained during boost and impact to make sure the foam pads are not trashed, leaving the AP flopping about like a fish out of water. The 3D printed cage was trimmed a...
by OverTheTop
Mon Oct 23, 2017 8:22 am
Forum: How's the Weather..?
Topic: Solar thread
Replies: 10
Views: 281

Re: Solar thread

The energy supply in this country is going to the dogs. Gas prices are up 400% over the past decade, for what used to be a cheap alternative for heating. Now electric heat pumps are in front I think for $/kw. Not helping things is that the gas suppliers have contracted to export enormous amounts of ...
by OverTheTop
Sat Oct 21, 2017 10:03 am
Forum: How's the Weather..?
Topic: Solar thread
Replies: 10
Views: 281

Re: Solar thread

[youtube]"Its only money "[/youtube] I see where you get this from :) , but it is out of context in this discussion. Since it isn't rocketry I am quite a bit more careful with spending it since it is a recurrent expense. Rocketry also has a combination of capital (hardware) and recurrent e...

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