Search found 47 matches

by citizenspace
Mon Apr 25, 2016 9:21 pm
Forum: Higher, Faster, Further
Topic: Altitude Records Online
Replies: 87
Views: 17537

Re: Altitude Records Online

Well looks like my Rocketry Records FTP Site has been removed from my email service. I guess their cost-cutting perk cannot be utilized anymore, so I have to deviously relink it somewhere else. If anyone on this Forum wants a link to the most current lists, just send me your email and I'll hook you...
by citizenspace
Mon Apr 25, 2016 11:24 am
Forum: Scratch Built
Topic: canted fin rocket
Replies: 30
Views: 6537

Re: canted fin rocket

Hey Adam A couple of thing 1/ As OTT's signature says "Everybody's simulation model is guilty until proven innocent" 2/ I've also found it plastered all across the internet that canted fins 'always reduce altitude'. Don't believe everything you read on the internet. I would guess that the...
by citizenspace
Sun Apr 24, 2016 3:35 pm
Forum: Scratch Built
Topic: canted fin rocket
Replies: 30
Views: 6537

Re: canted fin rocket

Canted fins... This is something I've been scratching my head over for a while now.... In Open Rocket, by giving a 0.5* cant on the fins of a 2 stage rocket (38mm min dia. J1026 from a 75mm min dia. M2245) you can get everything 'streamlined' enough to send the whole thing up to 129,000ft+. I've tri...
by citizenspace
Wed Sep 02, 2015 3:22 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Commercial Paraffin Hybrids?
Replies: 15
Views: 3653

Re: Commercial Paraffin Hybrids?

That's a lot of hassle for 200s. I've cracked 200s on two tests, one with a PE grain, one with nylon, both used simple injectors. But 200s with NOX+Whatever is an exception. You can expect to get 175-190s in any small motor. It's a LOT cheaper to make the motor 10% bigger than to try and herd the t...
by citizenspace
Wed Sep 02, 2015 12:12 pm
Forum: Thunda Down Under 2015
Topic: "The clock has started"
Replies: 24
Views: 4442

Re: "The clock has started"

Beyond shoving some loud speakers on a rocket and playing Thunderstruck with them, my granddad and I are planning to launch a 2 stage to 40,000ft. Well, he want's to convince my grandma to let us spend enough money to have a crack at the altitude record, but I'm not so sure we can pull that off in j...
by citizenspace
Wed Sep 02, 2015 10:48 am
Forum: Hybrid - Crossbreeding Rocketry
Topic: Commercial Paraffin Hybrids?
Replies: 15
Views: 3653

Re: Commercial Paraffin Hybrids?

Some merit in the 3d printing idea, In practice I doubt you'd see much measurable improvement. NOX+Blah has a fairly constant ISP over O/F ratios from 5:1 to about 9:1 . So varying density to account for changes in Oxidiser flux rate over time won't produce big improvements. Most hybrids hover arou...
by citizenspace
Tue Sep 01, 2015 3:15 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Commercial Paraffin Hybrids?
Replies: 15
Views: 3653

Re: Commercial Paraffin Hybrids?

I am not getting any arrogance in citizenspace posts. I guess different people read differently. On a completely different topic, has anyone tried a 3D printed fuel grain in a hybrid? I was thinking that the density of the 3D printed grain could be controlled, opening the door for some vacuum impre...
by citizenspace
Tue Sep 01, 2015 2:39 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Commercial Paraffin Hybrids?
Replies: 15
Views: 3653

Re: Commercial Paraffin Hybrids?

Oh I see... Sorry I really don't mean to come across arrogant, it's nothing like that. I try not to, I get told that a lot and I'm not trying to be. Sorry if I offend anyone or acted as if I thought I knew more. I didn't mean to. I'm not convinced I can do anything better/bigger/cheaper. I'm not try...
by citizenspace
Tue Sep 01, 2015 2:01 pm
Forum: Thunda Down Under 2015
Topic: "The clock has started"
Replies: 24
Views: 4442

Re: "The clock has started"

Yeah that sounds like a better idea, get a short burn motor and play it after it burns out.
by citizenspace
Tue Sep 01, 2015 1:33 pm
Forum: Hybrid - Crossbreeding Rocketry
Topic: Commercial Paraffin Hybrids?
Replies: 15
Views: 3653

Re: Commercial Paraffin Hybrids?

I'm confused... All I was asking was why they weren't using PW. Not that I could do it better. I listen straight away to both Marty and rocket star. I've never said anything about myself doing things any different. I was just asking why the companies haven't switched. They both gave me my answers, I...
by citizenspace
Tue Sep 01, 2015 12:27 pm
Forum: Propulsion
Topic: Estes ejection charge question?
Replies: 34
Views: 6025

Re: Estes ejection charge question?

Good idea, be interesting to see the reply

Except NASA doesn't have any launchers... They buy them
by citizenspace
Tue Sep 01, 2015 11:45 am
Forum: Propulsion
Topic: Estes ejection charge question?
Replies: 34
Views: 6025

Re: Estes ejection charge question?

Hmmm, actually I don't know... Now that I am looking at the ausrocketry pages for the A8-5 and the B6-4 from SCR, it seems as if that number doesn't have a correlation with any of the stats... Would anyone be able to correct me on that? I went to the Estes site and it says the 8 in A8-5 should be t...
by citizenspace
Tue Sep 01, 2015 6:16 am
Forum: Propulsion
Topic: Estes ejection charge question?
Replies: 34
Views: 6025

Re: Estes ejection charge question?

Hmmm, actually I don't know... Now that I am looking at the ausrocketry pages for the A8-5 and the B6-4 from SCR, it seems as if that number doesn't have a correlation with any of the stats... Would anyone be able to correct me on that? I went to the Estes site and it says the 8 in A8-5 should be th...
by citizenspace
Tue Sep 01, 2015 2:46 am
Forum: Propulsion
Topic: Estes ejection charge question?
Replies: 34
Views: 6025

Re: Estes ejection charge question?

thanks I think I should use open rocket sim to determine time it takes to hit apogee and use that to help me select which motors I need. Only thing I don't quite understand is Letter in motor indicates impulse range. First number is average thrust in Newtons and last is ejection charge time. My que...
by citizenspace
Mon Aug 31, 2015 6:41 pm
Forum: Higher, Faster, Further
Topic: Space: The ultimate in higher
Replies: 47
Views: 9203

Re: Space: The ultimate in higher

Yep that's the conclusion I've pretty much reached. Took me two and a half pages of being a fool to reach it, but it makes the most sense. Of course you always end back up at the price... And of course the Space Activities Act 1998.... but so far it seems like my original find is holding with the SA...

Go to advanced search