[Space] Interested Rocket Man

James Mulroy james.d.mulroy at gmail.com
Mon Jul 11 12:02:29 PDT 2011


Also, not all PVC motors are hybrid.  Some people use PVC as the case and
put sugar propellant in it.  There are different alternatives.

On Mon, Jul 11, 2011 at 12:00 PM, James Mulroy <james.d.mulroy at gmail.com>wrote:

> @Christopher--Sounds like a plan.  I'm pretty sure that I can make it out
> that weekend.  Where are you guys flying out of and what time?
>
> @Jonathan--PVC motors are somewhat popular because they are cheap and easy
> to make.  Unfortunately when they blow up they make a mess and make a lot of
> damage.  I was testing a non-PVC motor (it was aluminum) with a PVC test
> stand, and I did it near a garage (big mistake).  When it blew up, the PVC
> shrapnelled right into garage causing $300 in damage and completely
> decimating the siding.  It was a grenade.  PVC motors are bad.  While I'll
> never test a motor again unless I'm in the middle of a field, the point it
> that they can hurt someone and they can cost you $$ in damage when something
> goes wrong, and something WILL go wrong at some point.
>
> Composites and aluminum are far superior materials because they do not
> shrapnel.  You can get hundreds of dollars in high pressure composite pipe
> for free if you bring a case of beer to construction workers building a gas
> station.  Use that instead.  It's free, and withstand higher pressures which
> means a bigger range of propellant types, and most of all--it won't kill
> someone.  That's my suggestion.
>
> Oh, and also, burning PVC is totally disgusting.  It's make cyanide and who
> knows what other nasty crap that you don't want to inhale.
>
> I suggest that if you want an "easy" motor then you make a "nozzleless
> rocket motor."  This is something that I want to pursue.  They have a lot of
> benefits, they're cheap, and they're awesome!  Look up Ray Goodson's
> nozzleless rocket motors on Youtube.  There is a 5" and 3" version you'll
> see.
>
> -James
>
>   On Mon, Jul 11, 2011 at 10:28 AM, Jonathan Moore <moore at eds.org> wrote:
>
>> On Sun, Jun 12, 2011 at 2:40 PM, James Mulroy <james.d.mulroy at gmail.com>
>> wrote:
>> > I don't doubt it.  There is definitely more electronics (gas control) in
>> a
>> > hybrid.  More machining too!  I think it would be a fun project.
>>
>> The all PVC engines seem real simple to make and use. The biggest pain
>> is just hauling out the NOX to the launch sight from what I can tell:
>>
>>
>>    http://www.google.com/search?q=pvc+hybrid+rocket+engine
>>
>>
>> -Jonathan
>>
>
>
>
> --
> James Mulroy
> Student Researcher
> Freelance Writer <http://www.pcworld.com/author/James-Mulroy>
>  james.d.mulroy at gmail.com
> (920) 470-3473
>
>


-- 
James Mulroy
Student Researcher
Freelance Writer <http://www.pcworld.com/author/James-Mulroy>
james.d.mulroy at gmail.com
(920) 470-3473
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