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...

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.

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...

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...

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...

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

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.

On ya NSW...

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...

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...

Well, it could be worse.

https://www.bbc.com/news/world-us-canada-44527672

Excellent work Nat. Congrats on the cert!

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...

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...

Fireworks anyone?