Search found 921 matches

by strud
Fri Jun 14, 2019 6:38 pm
Forum: Air Command Water Rockets
Topic: Horizon - 2 Stage Water Rocket
Replies: 20
Views: 25789

Re: Horizon - 2 Stage Water Rocket

Usually these epoxies will cure at room temp to some degree or maybe you need to ensure they get to say 40degC to have enough stiffness to be self supporting. At those temps you could still leave it on the mandrel ie after pulling it off and removing the glad bake etc How would you heat that tube le...
by strud
Fri Jun 14, 2019 12:36 pm
Forum: Air Command Water Rockets
Topic: Horizon - 2 Stage Water Rocket
Replies: 20
Views: 25789

Re: Horizon - 2 Stage Water Rocket

Hi George, Maybe to assist with mandrel removal, you can make up some flush or internal caps for the PVC mandrel, put some fittings in them and run a low (say 2 bar?) pressure on the tube during curing (with a vacuum sleeve/heat shrink etc) on the outer. Then after initial cure, drop the pressure fr...
by strud
Thu Jun 13, 2019 9:25 pm
Forum: Air Command Water Rockets
Topic: Horizon - 2 Stage Water Rocket
Replies: 20
Views: 25789

Re: Horizon - 2 Stage Water Rocket

Awesome work George! I really like how the whole family is involved :-) You have given me some ideas for a fincan / rear module of my 4" rocket that will include a boatail. The carbon sock looks like a fantastic way to deal with tapers etc. Which 'weight' sleeving are you using? ie 3,6,12k? A q...
by strud
Wed Jun 12, 2019 6:17 am
Forum: I could use that
Topic: Aircraft Grade Plywood - Supplier?
Replies: 2
Views: 338

Re: Aircraft Grade Plywood - Supplier?

Hi Derek,

That's who I had to buy from quite some years ago, I couldn't find any other suppliers myself.

It is expensive relative to normal ply, but I fear that's what it is going to cost.

G10 glass epoxy sheet is an alternative but probably wont be any cheaper.
by strud
Tue Jun 11, 2019 10:13 pm
Forum: I could use that
Topic: Solidworks educational/maker licence
Replies: 1
Views: 53

Solidworks educational/maker licence

For students, makers or hobbyists out there, there is a Solidworks licence for y'all that is free for 12 months (at a time) https://www.solidworks.com/sw/education/SDL_form.html It does insert a 'watermark' / signature for future prosecution of those using it for commercial purposes...... Some instr...
by strud
Thu Jun 06, 2019 10:40 pm
Forum: Higher, Faster, Further
Topic: Simulation of external protuberances
Replies: 1
Views: 122

Simulation of external protuberances

I'm working on design and sim of a new series of 4" rockets using a design where the hybrid motor is a structural element. There will be a number of fasteners with their heads either in the air stream OR countersunk screws with the drive feature in the air stream. Anyone have suggestions on the...
by strud
Mon Jun 03, 2019 11:23 am
Forum: Rocketry Control Room
Topic: Arnhem Space Centre
Replies: 22
Views: 3448

Re: Arnhem Space Centre

Awesome work Blake et al !!!
by strud
Thu May 30, 2019 2:16 pm
Forum: How to's
Topic: Building a CF Tube
Replies: 10
Views: 750

Re: Building a CF Tube

Awesome job.

What epoxy are you using?
by strud
Wed May 29, 2019 5:47 pm
Forum: I could use that
Topic: Very low profile head screws
Replies: 0
Views: 151

Very low profile head screws

For those who might need screws that have their heads out in the air stream, these are going to be much lower drag: https://www.aliexpress.com/item/10-50-M3-M4-M5-M6-304-stainless-steel-Hex-Hexagon-Socket-Ultra-Thin-Super-Low/32981846363.html?spm=2114.search0604.8.4.10044a93ztTmaH&transAbTest=ae...
by strud
Wed May 29, 2019 5:31 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: NAMMO Commercial HTP rocket dev and flight video
Replies: 3
Views: 113

NAMMO Commercial HTP rocket dev and flight video

Drew put me onto these and I watched them last night.

A LOT of money sunk into this....amateur rocketry persons porn really.

They made it to 100km with a HTP hybrid, first to do so apparently.

Episode1
Episode2
Episode3
by strud
Wed May 29, 2019 5:15 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Show us your hybrid
Replies: 83
Views: 14507

Re: Show us your hybrid

Hi Voyager

Is that from BOC?

I got a price of $225 + GST about a week ago from them so a bit more than your paying.
by strud
Tue May 28, 2019 2:43 pm
Forum: I could use that
Topic: Belt Linisher on Special at Hare & Forbes
Replies: 4
Views: 1049

Re: Belt Linisher on Special at Hare & Forbes

On special again now, I just bought one https://www.machineryhouse.com.au/L107?promo=EOFY19&utm_medium=email&utm_campaign=AU_EOFY_11_28-05-19&utm_content=AU_EOFY_11_28-05-19+CID_6dd2fc10d5ff57ad97d72f53d0aa0e1f&utm_source=EDM final price is $50 lower than std ie comes out to $379 inc...
by strud
Wed May 22, 2019 2:33 pm
Forum: Propulsion
Topic: Hybrid Rocket Engine Tips
Replies: 5
Views: 553

Re: Hybrid Rocket Engine Tips

I just got pricing from BOC today as $227.73 + GST for a D bottle fill and $0.55+ gst per day rental.
by strud
Wed May 22, 2019 9:38 am
Forum: Hybrid - Crossbreeding Rocketry
Topic: Show us your hybrid
Replies: 83
Views: 14507

Re: Show us your hybrid

Just remembered there are a few videos drew put up of the commercial motors I've flown (rattworks)



Will have to look harder for some others....
by strud
Wed May 22, 2019 9:28 am
Forum: Hybrid - Crossbreeding Rocketry
Topic: Show us your hybrid
Replies: 83
Views: 14507

Re: Show us your hybrid

Hybrids are different in many ways, not all "more betterer" - lower perceived cost in larger impulse launches (ie consumables, not in support equip etc) - novel flight differences - longer thrust duration, different sound, lower thrust level at higher impulse etc - higher complexity - need...

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