I believe I've seen you use a couple different sprayers, can you comment on which you like the best and why?
I like the green 360 spray jets.
You can get them from emrealdelectronics .com
http://www.emeraldelectronic.com/store/proddetail.cfm/ItemID/428954/CategoryID/20000/SubCatID/1851/file.htm
You can find the 6mm grommet and the black poly tubing there also.
Are the spray lines simply jambed onto the end of the mister and then shoved into the grommet to hold it in place?
Can you conceive a rough formula of # of misters to GPH for pump sizing?
There is a formula, but here is the easy way.
Use a
big mag drive pump.
I like the danner 950, I have two.
I also have a danner 1250
and I have a Via Aqua 600 on the chiller,
and a few walmart powerheads,
in all of my rez',
except this one,
which has the chiller pump,
to keep things stirred up.
Hydro Ponic=water working
Place the spray jet close enough on each side of the plant,
to spray the roots on both sides.
I have the spray jets every 15 centimeters on this 4 inch tube,
and the plants are in between,
so about 7 centimeters on each side of the plant.
Do you have any safeguards in place to protect your op from power outages?
No.
I had a 12 day power outage last fall after hurricane Ike.
A back-up generator is high on "the list"
If you have a power outage of a few hours
you could use batteries and a inverter.
Or you could hand spray inside the tube
if you can reach in from both ends
like the space shuttle.
The plant in the middle would suffer in this system,
but probly the nutrient flow though the tube
would be enough to sutain life.
As long as your nutrients are cool
and have enough DO
you could hand feed every hour or so
and keep them going,
until you got stoned and forgot.
Use an egg timer.
I have left them for three hours with the pumps off,
with absolutely no affect.
Late in the grow
I do let them go to wilt,
and it takes a few hours,
depending on the outside air temp,
and the humidity and lighting.
Aside from initial investment, do you see any other benefits of using 4"?
If money was not an issue, would you see any benefit of using the 6"?
What's your opinion of PVC fence post for aero systems vs DWV Pipe?
I like the tube because it is cheaper.
That is the only reason.
If they were all the same price
I would use the 4 inch pvc tube
because it is easy to handle.
Square might be just as good,
I've never used it,
so I can't really judge it,
but I don't see any obvious drawbacks.
Is that black polyethylene tubing?
Yes
Have you ever experience kinking with it?
No
The adapters from your manifold - 1/2" NPT to 1/4"OD compression?
Here is a link to the male Tee.
You have to purchase ten for $46
Male Branch Tee
Do you still use Coco for seeds?
Yes
Any debris in the res/misters from it?
No
Have any thoughts on using rockwool instead?
No thoughts cause I'm pretty stoned,
but really,
I've never used it,
and my desire is to get away from all media
and just use neoprene.
. I have several projects in the works. My next is a vertical version of your spaceship, it will probably be about mid year before I get started, and I'm really hoping you'll be around to help!
BTW, I use an aeroflo2 system. If you have any questions about it's design, I'd be happy to answer.
No questions about the aeroflo2,
but be sure and post a link to your Vertical Space Shuttle here.
Hurry up.
.
... Didn't even realize you had a live one up. Certain there will be more to come.... This is so far beyond where I can go right now. Makes me want to take a wrong turn when I go to Chicago in March. 
