Search found 854 matches

by drew
Tue Jul 17, 2018 12:09 am
Forum: News & Events
Topic: IREC 2018 launch compilation
Replies: 0
Views: 23

IREC 2018 launch compilation

Here's a 50 minute compilation of the IREC 2018 / Spaceport America Cup launch. As can be expected there are some cool and really cool flights.

by drew
Sun Jul 15, 2018 12:13 pm
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 41
Views: 1453

Re: Airframe choices (or why you should consider rolling your own airframes)

My understanding (sorry having difficulties finding a reference) is that the epoxy forms into a polymer as it cures (essentially building one large molecule). At the join however intermolecular forces are at play and this is what keeps the 2 or more pieces stuck to each other. The intermolecular fo...
by drew
Wed Jul 11, 2018 3:39 pm
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 41
Views: 1453

Re: Airframe choices (or why you should consider rolling your own airframes)

SpaceManMat wrote:You could probably try filling the dry spots. It would still lack some strength but would be better none the less.

I suspect it would be roughly identical in strength Matt as logically you'd be filling a gap with the same epoxy that would have been there in the first place.
by drew
Mon Jul 09, 2018 12:49 pm
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 41
Views: 1453

Re: Airframe choices (or why you should consider rolling your own airframes)

Hi Drew, Thanks for feedback. No worries! The result - I could remove the tube this time after 10 hrs! Yes! There are a few spots where there is epoxy missing on inside of tube (air bubble?). But trust me it is a lot better than the first one. Fantastic work d00d! As for those spots inside the tube...
by drew
Tue Jul 03, 2018 11:53 am
Forum: Mid/High Powered Rocketry
Topic: Don't Debate This, Too
Replies: 39
Views: 1194

Re: Don't Debate This, Too

OK, but perhaps someone would want to do a sim of the two stage case, to see of it could reach the 100 km altitude for suborbital space. From that other link you shared (not the Bare Necessities one) I read it as the N5800 to N5800 didn't have the guts to reach space so he bolted a N10,000 to the b...
by drew
Mon Jul 02, 2018 11:51 am
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 41
Views: 1453

Re: Airframe choices (or why you should consider rolling your own airframes)

Hi, Question: I'm thinking of removing the air-frame partly cured off the Mandrel....before shrinkage starts to get too bad. Does anyone have any advice on this? e.g. time to wait? Perhaps other way to ensure removal of the air-frame off the Mandrel? My thoughts are that ideally you'd leave your ai...
by drew
Mon Jul 02, 2018 11:40 am
Forum: Western Australian Rocketry Society
Topic: AYRC WA Round
Replies: 3
Views: 116

Re: AYRC WA Round

And here is some video from the AYRC WA round on Saturday.

by drew
Mon Jul 02, 2018 10:30 am
Forum: Mid/High Powered Rocketry
Topic: Don't Debate This, Too
Replies: 39
Views: 1194

Re: Don't Debate This, Too

RGClark wrote:Tuesday, September 4, 2012
Bare Necessities: N5800 competition entry.
http://highpowerrocketry.blogspot.com/2 ... entry.html


That's a pretty poor example Bob. That project looked good but flew terribly.
by drew
Mon Jun 25, 2018 4:15 pm
Forum: How's the Weather..?
Topic: Wednesday 6th June
Replies: 4
Views: 246

Re: Wednesday 6th June

On ya NSW...
by drew
Mon Jun 25, 2018 12:46 pm
Forum: Thunda Down Under 2019
Topic: One year and counting...
Replies: 2
Views: 300

Re: One year and counting...

So one of the flights I've got planned for THUNDA 2019 is a 54mm MD bird flying on a long since purchased and waiting in Queensland L935. Below is a rough sim of the rocket. I suspect I'll add 5-15% more weight on the final rocket so my peak velocity will suffer but on the plus side I'm happy with t...
by drew
Wed Jun 20, 2018 6:14 pm
Forum: Rocketry Control Room
Topic: Australia closer to a national space agency
Replies: 18
Views: 1830

Re: Australia closer to a national space agency

SpaceManMat wrote:Yet to find out exactly what he has in mind... The airforce has long had a space presence.


Separate but equal apparently. It worked so well the first time...
by drew
Wed Jun 20, 2018 9:37 am
Forum: Mid/High Powered Rocketry
Topic: Formula 150 L3 Build
Replies: 20
Views: 626

Re: Formula 150 L3 Build

Excellent work Nat. Congrats on the cert!
by drew
Wed Jun 13, 2018 3:21 pm
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 41
Views: 1453

Re: Airframe choices (or why you should consider rolling your own airframes)

What they said. For non-critical diameters I just use PVC pipe, but sounds like you want to go MD. ...Nothing long enough to roll on. Is 915mm too short? You could get two PML tubes and carefully join them. https://ausrocketry.com.au/couplers/phenolic-coupler/ctf-1-5-36.html or there's 1220mm BT: h...
by drew
Wed Jun 13, 2018 9:48 am
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 41
Views: 1453

Re: Airframe choices (or why you should consider rolling your own airframes)

I've been looking high/low for a supplier of tubes that could sell me something to use as a Mandrel - 38mm. AusRocketry sell couplers, but all small sizes. Nothing long enough to roll on. I've always used phenolic and bluetube "motor mount" tubes sourced from Blake. As OTT said, drop Ausr...

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