Search found 948 matches

by strud
Wed Jul 31, 2019 1:52 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Gilmour is using Hydrogen Peroxide as their oxidiser
Replies: 35
Views: 2650

Re: Gilmour is using Hydrogen Peroxide as their oxidiser

Sounds like a pressure regulator &/or relief valve/burst disk(?) failure.

Are they using helium as a pressurant?
by strud
Wed Jul 31, 2019 9:38 am
Forum: Higher, Faster, Further
Topic: Boat tail fin can
Replies: 13
Views: 859

Re: Boat tail fin can

I've finally dusted off my licence of Dolphin Lathe Standard to create the NC program to turn up the mandrel. The final design includes a 60mm radius blend in between the taper and main cylinder and I will be making it out of HDPE (more on that later)... Here is a youtube vid of how this process wor...
by strud
Thu Jul 25, 2019 2:57 pm
Forum: How's the Weather..?
Topic: Space or Nothing
Replies: 7
Views: 284

Re: Space or Nothing

A few things I noticed from this video : - Awesome lab the rocketry society/club has there - Culture with the group was great, although on the first launch it was bedlam ! Not too hard to tell this was a Southern Californian group without even knowing where they were from :-) - They were strong enou...
by strud
Sat Jul 20, 2019 8:05 am
Forum: Support & Recovery & Misc.
Topic: Chute recommendations
Replies: 12
Views: 736

Re: Chute recommendations

So based on real feedback and my best analysis, I've gone ahead and ordered one of these with a deployment bag: https://fruitychutes.com/buyachute/iris-ultra-standard-chutes-c-29/iris-ultra-72-standard-parachute-28lbs-20fps-p-143.html Plan is to get this in hand shortly and mock up the recovery harn...
by strud
Wed Jul 17, 2019 10:30 pm
Forum: Western Australian Rocketry Society
Topic: 2019 WARS Grass Valley launch pics
Replies: 8
Views: 510

Re: 2019 WARS Grass Valley launch pics

Nice !

I have fond memories of the launches at Grass valley.
by strud
Tue Jul 09, 2019 3:50 pm
Forum: I could use that
Topic: Well priced plastic bar supplier
Replies: 0
Views: 313

Well priced plastic bar supplier

Found these guys on eBay when looking for 100mm HDPE bar. Good pricing and convenient

by strud
Sat Jul 06, 2019 8:06 am
Forum: Higher, Faster, Further
Topic: Boat tail fin can
Replies: 13
Views: 859

Re: Boat tail fin can

Sounds like addition of PVA or even hairspray on top of the wax is a good insurance policy

by strud
Sat Jul 06, 2019 7:55 am
Forum: Higher, Faster, Further
Topic: Boat tail fin can
Replies: 13
Views: 859

Re: Boat tail fin can

Hi George, Excellent fedback, many thanks. I will look for some of that 2 pack estapol, will likely use that in the future instead of the West systems epoxy. Did you try heating the whole thing to soften the wax? That is something I might try if it gets a bit 'difficult' I think that I'm going to ha...
by strud
Sat Jul 06, 2019 7:47 am
Forum: Support & Recovery & Misc.
Topic: Chute recommendations
Replies: 12
Views: 736

Re: Chute recommendations

Hi Mike,

Super helpful indeed, many thanks for going to that effort.

The results you have are practical and are somewhat larger than stated on the manufacturers site so good to know and will be very helpful in planning the recovery bay dimensions.

CS
by strud
Fri Jul 05, 2019 5:57 pm
Forum: Higher, Faster, Further
Topic: Boat tail fin can
Replies: 13
Views: 859

Re: Boat tail fin can

So after some more work on my CAD model and looking at the thicknesses of the carbon and glass sock, I came to the realisation that the plug diameter was too small and my composite tube wall thickness was going to be around 3mm :shock: Rather than throw away the plug (maybe I should have) I built it...
by strud
Fri Jul 05, 2019 9:56 am
Forum: Support & Recovery & Misc.
Topic: Chute recommendations
Replies: 12
Views: 736

Re: Chute recommendations

Hi Mike That would be most appreciated Here is their packing instructions, you may already have seen... https://the-rocketman.com/packing/ If you look at their specs for packing volume, these std chutes are meant to be quite good with the 84" (7ft) into 3.85" length for a 3.9" ID tube...
by strud
Thu Jul 04, 2019 3:05 pm
Forum: Support & Recovery & Misc.
Topic: Chute recommendations
Replies: 12
Views: 736

Re: Chute recommendations

Hi Mike

Are they the 'std' 4 line chutes?

Very interested to know what you think their packing length in a 4" tube is since on their website the packing length for those is quite small. I figured that was because of the low number of lines....
by strud
Thu Jul 04, 2019 4:29 am
Forum: Rocketry Control Room
Topic: Orion Launch Abort
Replies: 3
Views: 188

Re: Orion Launch Abort

That thing is full of very angry stuff....

400,000lb of thrust



Nice test video here too

by strud
Mon Jul 01, 2019 11:13 am
Forum: Support & Recovery & Misc.
Topic: Chute recommendations
Replies: 12
Views: 736

Re: Chute recommendations

Thanks CATO and OTT I did some late night surveying of the commercial offerings last night and there's a lot on offer but selection is not straight forward..... For the lighter of the two vehicles, the Rocketman std chute 84" looks to be quite suitable with a cost of US$65, packed length at 4&q...
by strud
Sun Jun 30, 2019 10:09 pm
Forum: Support & Recovery & Misc.
Topic: Chute recommendations
Replies: 12
Views: 736

Chute recommendations

I'm in the midst of designing a 4" vehicle with two configurations, with dry/recovery masses of say 11 and 6kg. After looking up a few sources of commercial chutes for these masses, it seems I could be up for between US$200 and US$300 for the likes of an IRIS from Fruity chutes and similar. Thi...

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