I've placed a couple of pics of the 100mm motor that I lugged out to LDRS-- a semi-custom job originally intended for a Mark Simpson FTBOD, but not actually flown.
What are the loops of hose for?
Sweet!
According to Marcus Leech :
Hey! _We_ lugged that thing to LDRS!
You just had to do the "act like a sauve rocket scientist" bit and pose for pictures.
[Unfortunately we didn't have any nitrous in the car, otherwise, we'd have been tempted to cross the St. Lawrence without using the bridge ;-)]
When you're designing U/C hybrids, you have several choices in trying to get high flow rates of N2O into the chamber. You can use a single, large fill-hose/compression-fitting combination. This generally sucks, since the sonic flow will tend to piss a lot of N2O out the nozzle unreacted.
You can use Dave Griffiths (Rattworks) trick of hiding a more sophisticated injector inside a large fill hose--the "real" injector "uncloaks" at the moment of ignition.
Or, you can use a cluster of much smaller fill-hoses/injectors, with all but one of the injector ports looped to a partner. This gives you a more efficient total flow, both because at least part of the flow is concentrated towards the outside (and stands a better change of being in the flame zone at the grain surface), and because the multiple flows interact to produce finer droplets.
To abuse a phrase "Just Tech Marcus".
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