Peroxide to avoid cryo on our first engine. I'd rather like to avoid
that debate.
I have a supplier
I don't want to reinvent the wheel here. I'd prefer to know if there is
a similar project I can use as a starting point.
Armadillo had a similar motor but did not solve the combustion issues. I
can use that as a starting point if I have too.
Yes breaking any new ground is what I'm trying to avoid.
If I can get the machine work done and have the motor built by April
that would be enough.
And thank you Wyatt for the input. The decision to go with peroxide this
time is set in stone.
-------- Original Message --------
Subject: [AR] Re: Peroxide/Gasoline Engine
From: Wyatt Rehder <wyatt.rehder@xxxxxxxxx>
Date: Mon, December 14, 2015 1:53 pm
To: arocket@xxxxxxxxxxxxx
My question would be, why peroxide? It has bad materials compatibility
issues, with things needing to be passivated. You need fullbody PPE to
handle it. It is only made by a couple companies in the US, with one of
them you have to pay to start up their peroxide plant. It has very
stringent (i.e. expensive) shipping requirements, and cannot be shipped
with other materials. You also get the added fun that it is a
monopropellant so flashback issues are a concern. Peroxide is great
compared to RFNA or Hydrazine, as it wants to destroy your organs to a much
smaller degree.
When everything is all said and done, your plumbing ends up being pretty
much just as expensive as doing cryo. So I'd honestly go with LOx for a
conventional liquid long before I'd go with peroxide. As you can buy LOx
just about anywhere.
The only reason I would use peroxide is if I wanted to do a catalytic
decomposition rocket, which could potentially simplify things. Or if you
happen to be one of those peroxide manufactures, then all the power to you.
Also 1000 psi seems like a pretty high chamber pressure to start off with
for a 1000-2000 lbf engine. Especially since you are limited in where you
can use copper on your engine due to compatibility issues, it would seem
like the heat flux would be kinda tough to deal with at 1000 psi. Keep in
mind that for stability your injector pressure needs to be even higher than
your chamber pressure.
If you are trying to turn around on such a short deadline, doing anything
that is breaking any kind of new ground is going to be a detriment for you.
You will have a really difficult time getting any kind of liquid engine
working in a satisfactory manner by April.
On Mon, Dec 14, 2015 at 7:07 AM, Monroe L. King Jr. <
monroe@xxxxxxxxxxxxxxxxxx> wrote:
I was looking over the work done by amateurs on peroxide/kero rocket
motors.
What I see so far is a lot of unstable motors with asymmetrical issues.
What I need is some good data and guidance working on a 1000-2000lb
range motor.
Time is a factor I need to be as close as I can to a working engine by
April.
Chamber pressure is ultimately 1000 psi
This is a test engine water cooled static test only.
I need tips and pitfalls from experienced rocketeers.