[BProckets] Double stage in a single motor

[flint hapirat]

Hi guys, 
Please advise - I want to know what do you think of
this idea:

If one builds a double stager motor the rocket
actually lifts:
2 propellant grains
2 nozzles
2 end plugs
2 body lengths of the motor tube
[rocket body is neglected as it is a constant – to
this end one will have to use a single stage rocket
body so the weight of the first section that falls off
with the first motor won't interfere with the calc.]

However, if instead of a double motor system you make
it (bottom to top): nozzle, a single motor tube ~2.1
times longer than the usual, and then make (ram BP -
in my case) a core burner section, add a "delay" grain
(full grain, no core) and on top of that, another core
burner section identical to the first one. Oh, and an
end plug, of course


This motor has:
2 grains (and a short delay segment, negligible)
"2 motor tubes" so to speak
only 1 end plug
only 1 nozzle

The burn characteristics should be almost the same:
high thrust, slow rise, high thrust again.

Here is the question:
Can such a motor actually be as efficient in apogee
terms, compared to a "real" double stager?
[considering an optimal condition of no nozzle
erosion) 

I know that the "second stage" is dragging a double
sized tube, but the first stage isn't carrying a
second plug and nozzle... Will this compensate?

To this end - I've made 2 such BP motors and, although
I can't compare the apogee (technical problems) I can
(and will) report the flight results. 

In the meantime, I will be happy to hear what you
guys/girls think of this crazy idea...

Cheers,
Flint 


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