Search found 187 matches

by Ray
Thu Aug 25, 2011 5:18 pm
Forum: Gas turbine forum
Topic: What is the potential thrust of a homemade jet engine?
Replies: 1
Views: 1359

Re: What is the potential thrust of a homemade jet engine?

I'd like to know how far is UP!

The question is too broad. Think about what you actually want to know and ask again.
by Ray
Wed Jul 20, 2011 2:57 pm
Forum: Gas turbine forum
Topic: Project Radial Jet from a 105mm Holset
Replies: 40
Views: 21736

Re: Project Radial Jet from a 105mm Holset

You could try filling the tubes with Sand...or filling with water and freezing it. I've seen some put a spring around it too. The Sand method has always worked best for me...
by Ray
Wed Sep 17, 2008 5:23 pm
Forum: Rocket forum
Topic: Mini N2O gas canisters?
Replies: 16
Views: 6355

Re: Mini N2O gas canisters?

Then wouldn't it make more sense to inject the fuel under pressure and rely on air as the oxidizer? I doubt that you'd really get much appreciable thrust from what you suggest. How are you going to entrain atmospheric pressure air into a chamber that is running at 68 atmospheres. I've thought at tim...
by Ray
Tue Sep 16, 2008 6:21 pm
Forum: Rocket forum
Topic: Mini N2O gas canisters?
Replies: 16
Views: 6355

Re: Mini N2O gas canisters?

fastnova & Ray - I have a better idea -- but, unfortunately, it doesn't belong on the Rocket Forum (unless you'd want to use it as a low-altitude booster or something). Anyway: Rig the little cannister so that when pierced, it blows into the front end of an eductor, so it will drag in a bunch of ai...
by Ray
Mon Sep 15, 2008 10:17 pm
Forum: Rocket forum
Topic: Mini N2O gas canisters?
Replies: 16
Views: 6355

Re: Mini N2O gas canisters?

Your idea works and is available for purchase.

Seems pretty complex for only 11 N of total impulse.

http://www.aeroconsystems.com/motors/Sc ... reamer.htm

Enjoy
by Ray
Sat Jun 16, 2007 12:29 am
Forum: Rocket forum
Topic: Rcandy recipe, not in grams.
Replies: 4
Views: 3194

Go to Nakka's site and find out how he does it. Read the entire site. Everything you need to know is there...

You'll have to buy a scale, no way around it.

Going by volume just won't give you the results you want.
by Ray
Thu Feb 22, 2007 3:25 am
Forum: Rocket forum
Topic: Solid fuel questions
Replies: 60
Views: 24121

Re: Chamber Volume

Now let me ask a simple question, why does the chamber volume increasing by N number of charges lower thrust? what is the difference between this discrete staged increase in volume and that of a progressive volume increase in a normal fuel grain and chamber? In a normal fuel grain there is an incre...
by Ray
Tue Feb 20, 2007 5:55 pm
Forum: Rocket forum
Topic: Solid fuel questions
Replies: 60
Views: 24121

Re: Solid fuel questions

How much residue is left after combustion is complete (ash) Very little, most of the ash I see in a motor is from the casting tubes and liner...I sometimes find a small amount of Al2O3 on the convergent portion of the nozzle, but that depends on formula and pressure. Combustion is usually very comp...
by Ray
Tue Jan 16, 2007 5:52 pm
Forum: Rocket forum
Topic: Rocket Engine from XCOR
Replies: 5
Views: 3721

mach diamonds in the exhaust are COOL, but speak to improper nozzle design...

Looks like a big motor.
by Ray
Sun Dec 24, 2006 6:53 pm
Forum: Rocket forum
Topic: Is it legal to make sugar rockets in Georgia (US)?
Replies: 2
Views: 3213

I'm not a lawyer, so I can't speak the legality of making rocket motors. I do know that KN and Sugar aren't regulated substances... Mixing them together doesn't appear to make them a regulated substance (the ATF is starting down that path, but not there yet). Lots of people in the US make KN/Sugar m...
by Ray
Fri Dec 15, 2006 3:40 pm
Forum: Rocket forum
Topic: Fast Sugar Propellant
Replies: 37
Views: 17771

re: Fast Sugar Propellant

Why not core the grain slightly? Just take an appropriate sized drill bit and drill into the grain some distance. It'll increase burning surface area. You'll notice a shorter burn time, higher internal pressures and a nice smooth burn. Depending on how deep you drill and what size you drill you'll h...
by Ray
Thu Dec 14, 2006 4:43 pm
Forum: Rocket forum
Topic: APCP propellant formulations
Replies: 1
Views: 3207

re: APCP propellant formulations

OH MY. Catocene and Ferrocene are not for amateurs...scary stuff that even the professional motor builders (Aerojet, Thiokol, etc) avoid, except this one. Sub 20 micron AP can go high order. spontaneously...be very careful with the grinding. Use a ball mill with non sparking media. Treat the AP as a...
by Ray
Fri Dec 08, 2006 1:16 am
Forum: Rocket forum
Topic: Physics xtra credit project: Build two 1-time-use candyrocks
Replies: 29
Views: 13330

Re: re: Physics xtra credit project: Build two 1-time-use ca

I am sure they are trying to please everyone while keeping us safe. Must be a hard job... Anyone know the nubmer of deaths or injuries caused by rockets per year, just wondering. Thats the point, they are claiming to try to keep us safe...they aren't doing it. Only a total moron of a terrorist woul...
by Ray
Fri Dec 08, 2006 12:07 am
Forum: Rocket forum
Topic: Physics xtra credit project: Build two 1-time-use candyrocks
Replies: 29
Views: 13330

re: Physics xtra credit project: Build two 1-time-use candyr

it won't explode...it will overpressurize the case and go out. Overpressurization and explosion are very, very different things. Explosion is a very specific term...not to the ATF but to anyone that works in the field. It is something that has a supersonic burn rate...ie it burns at over 1100fps (ap...
by Ray
Thu Dec 07, 2006 9:41 pm
Forum: Rocket forum
Topic: Physics xtra credit project: Build two 1-time-use candyrocks
Replies: 29
Views: 13330

Re: re: Physics xtra credit project: Build two 1-time-use ca

If you ask the ATF they will tell you that APCP, ANCP and KNCP based rocket motors are under their regulations. BP motors that contain more than 62.5g of propellant would be under this rule as well. While they will tell you that these are regulated, their own regulations don't support that. APCP is...