Ballpark chart (attached) for hybrid analysis so I've used Polyethylene instead
of Kero.
Troy
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Evan Daniel
Sent: Friday, 26 August 2016 9:46 AM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: "Direct" Hydrogen Peroxide engines
As a general rule, the Isp penalty for X% of inert mass in your propellants is
about 0.5 * X %, for small values of X. (X% of inerts drops the available
energy by X%, but exhaust velocity goes with the square root of energy.)
Note that you have to include the fuel mass in that approximation as well.
Second-order effects for things like dissociation, nozzle gas characteristics,
and changing heat capacities of exhaust gases are neglected, and we're assuming
that the O:F ratio is held constant when you measure the ratio of the
*non-inert* portions.
Evan Daniel
On Thu, Aug 25, 2016 at 6:37 PM, <qbert@xxxxxxxxxxxxxxx> wrote:
And how much ISP do you lose in that 3 to 7%?
Robert
At 03:40 PM 8/25/2016, you wrote:
Who needs 87 %? 80-84 % is sufficient for kerosene autoignition.
jd
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx
[mailto:arocket-bounce@xxxxxxxxxxxxx]
On
Behalf Of qbert@xxxxxxxxxxxxxxx
Sent: donderdag 25 augustus 2016 22:46
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: "Direct" Hydrogen Peroxide engines
Cobalt butyrate seems to be really hard to find in any form and I can
find no MSDS for it however Cobalt Octoate which is also mentioned is
somewhat toxic in close quarters and on prolonged contact, It
supposedly mixes with
JP10 and according to the info I just went through is easy to
acquire. I have no specifics on it's use or results of use with HTP.
In reply to another post, plated silver will start shedding from
nickle even at 87% on longer runs, 45 seconds in our case.
Robert
At 11:01 AM 8/25/2016, you wrote:
On Wed, 24 Aug 2016, David Weinshenker wrote:
I think uncatalyzed peroxide is a neglected approach.
What do you think of solvent/catalyst fuel mixtures...
Promising. Endlessly promising, in fact. :-) Too many promises and
not enough solidly-verified results, especially in the form that's
really wanted: a low-cost non-hazardous catalyst that works well in
small quantities with a good cheap fuel and readily-available peroxide.
(And what's the general situation regarding getting whatever
license is needed to practice an invention on a private basis, when
the Navy owns the patent rights?)
I believe it's the same answer as for any other patent: you have to
get the approval of the rights owner (yes, even for private
non-profit use). Hadn't heard of any streamlined method for doing
this with the US government, although I haven't gone looking.
Wondering how toxic cobalt butyrate is going to be, though...
Organometallics generally aren't good news, nor are cobalt compounds.
But I know nothing about cobalt butyrate in particular.
Henry
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OF Ratio Comparisons for Different Oxidizers.png
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