There is a rocket engine calc zip file in Arocket
archives that will give you everything you need
to build a silver cat pack motor.
You tell it how long you want the motor to run
and what % H2O2 and it will give you the basic numbers for a motor.
for some reason I can't download it but maybe you can.
Robert
Robert
At 07:17 PM 12/15/2015, you wrote:
Here's the quick and dirty calculation I would do.
I'd expect half of the pressure to be lost to pressure drops in the system so plan for a chamber pressure of 470 psi.
At that pressure a peroxide monoprop system might get 100-110 seconds Isp depending on concentration of peroxide. I used RPA and took 20% off of theoretical to leave a nice big margin.
At 100 seconds Isp 6.23 lbm/s would generate 623 lbf of thrust.
To calcualte the throat area use this formula:
Thrust = chamber pressure * throat area * thrust coefficient
Thrust coefficient is an empirical fudge factor. Â 1.2 usually works well, so:
623 lbf = 470 psi * area * 12
area = 1.1 square inches
throat diameter = 1.18 inches
Make the chamber diameter three times the throat diameter.
If you feel optimistic redo the calculation with an Isp of 110.
On Tue, Dec 15, 2015 at 6:00 PM, Monroe L. King Jr. <<mailto:monroe@xxxxxxxxxxxxxxxxxx>monroe@xxxxxxxxxxxxxxxxxx> wrote:
I'll take that advice!
Here are the pump specs:
Mass Flow = 6.23 lb/s
DP = 940 psi
NÂ = 50 kRPM
There are no pressure drops taken into account of course at the
pressure.
Can you give me a quick and dirty chamber size and throat diameter?
> -------- Original Message --------
> Subject: [AR] Re: Peroxide/Gasoline Engine
> From: Paul Breed <<mailto:paul@xxxxxxxxxx>paul@xxxxxxxxxx>
> Date: Tue, December 15, 2015 5:33 pm
> To: <mailto:arocket@xxxxxxxxxxxxx>arocket@xxxxxxxxxxxxx
>
>
> Simple advice....
> Get a turbopump -> monoprop peroxide running...
> Monoprop can be simple turned stainless chamber , or even welded up from
> various 316 stainless parts from mcmaster...
>
> Count on CAT pack being 1.25 to 1.5 in thick
> Use silver plated nickel or solid silver cat screens...
> The Andrews link posted earlier has conservative cat pack design info...
>
> After that all works make a regen chamber add fuel and double the ISP...
>
>
>
>
>
>
>
>
> On Tue, Dec 15, 2015 at 4:23 PM, Monroe L. King Jr. <
> <mailto:monroe@xxxxxxxxxxxxxxxxxx>monroe@xxxxxxxxxxxxxxxxxx> wrote:
>
> > Let me make it more clear then! I'm looking for work I can COPY or some
> > Free engineering from people on the list that have gone before me with
> > some pretty specific numbers.
> >
> > Because I don't have time right now to reinvent the wheel.
> >
> > Today I have some backing and I'm trying to make the most of it for them
> > and NOT for myself alone.
> >
> > I will check the archives as well thank you.
> >
> >
> >
> > > -------- Original Message --------
> > > Subject: [AR] Re: Peroxide/Gasoline Engine
> > > From: "John Dom" <<mailto:johndom@xxxxxxxxx>johndom@xxxxxxxxx>
> > > Date: Tue, December 15, 2015 4:29 pm
> > > To: <<mailto:arocket@xxxxxxxxxxxxx>arocket@xxxxxxxxxxxxx>
> > >
> > >
> > > Whatever Troy, this broken record surfacing once more hit me.
> > > jd
> > >
> > > -----Original Message-----
> > > From: <mailto:arocket-bounce@xxxxxxxxxxxxx>arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx]
> > On Behalf Of Troy Prideaux
> > > Sent: dinsdag 15 december 2015 23:32
> > > To: <mailto:arocket@xxxxxxxxxxxxx>arocket@xxxxxxxxxxxxx
> > > Subject: [AR] Re: Peroxide/Gasoline Engine
> > >
> > > Got out of the wrong side of the kennel this morning?
> > >
> > > Troy
> > >
> > > -----Original Message-----
> > > From: <mailto:arocket-bounce@xxxxxxxxxxxxx>arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx]
> > On Behalf Of John Dom
> > > Sent: Wednesday, 16 December 2015 9:22 AM
> > > To: <mailto:arocket@xxxxxxxxxxxxx>arocket@xxxxxxxxxxxxx
> > > Subject: [AR] Re: Peroxide/Gasoline Engine
> > >
> > > Odd to keep adhering to such idea, like a fanatic, again and again! Not
> > the ancient Clark book nonsense line Spencer clang to I hope? To only claim
> > they have flown is misleading this list. They most certainly have NEVER
> > flown, anywhere on this planet. Static tests, yes, several options, but
> > that is beside the point.
> > > jd
> > >
> > > -----Original Message-----
> > > From: <mailto:arocket-bounce@xxxxxxxxxxxxx>arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx]
> > On Behalf Of Ben Brockert
> > > Sent: dinsdag 15 december 2015 23:03
> > > To: <mailto:arocket@xxxxxxxxxxxxx>arocket@xxxxxxxxxxxxx
> > > Subject: [AR] Re: Peroxide/Gasoline Engine
> > >
> > > But I thought this topic "has been discussed AD NAUSEAM"?
> > > Non-catalyzed peroxide hydrocarbon engines have flown, but I don't want
> > to be the one to beat a dead horse.
> > >
> > > On Tue, Dec 15, 2015 at 4:59 PM, John Dom <<mailto:johndom@xxxxxxxxx>johndom@xxxxxxxxx> wrote:
> > > >> No, a catalyst is not required.
> > > > Oh, is that so, Ben? Your references of anything which ever flew with
> > H2O2, without a catalyst? VEEERY interesting.
> > > > jd
> > > >
> > > >
> >
> >