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So, I haven't updated in a while. Here goes.
Pato II - Pato II is modeled, but not yet
simmed. It is going to be a 3FNC, 2.00" ID, with a 38mm MMT. The fins
will be Honeycomb & Carbon Fiber composite, the airframe, nose cone
and boat-tail will be 2 layers of 5.8oz CF, with a layer of 5.7oz FG in
the middle. I am going to be forming the nose cone, and boat tail from
fiberglass molds, the plugs for which are in the works. I have fabric,
and epoxy, and am simply waiting on getting the plugs and molds
finished to start making parts. The nose cone will incorporate an
adjustable weight system, which will allow for flights on G thru J
motors. Solidworks says that the airframe, and e-bay (no chutes, no
recovery harness) weighs 4.6 lbs with 3 lbs of nose-weight. I like
those measurements, but we'll see what RockSim has to say about it.
GBU-15 - My GBU-15 is modeled, but not yet
simmed. The fin construction for this will be the same as Pato II. The
nose cone and boat-tail will likely be an additional layer of FG &
CF from Pato II, partly because of it's size, but also for a bit of
bluk, to match the 11oz CF that the airframe is going to be using,
though I will not be leaving it naked. The airframe's bulge is going to
be foam laid over the inner layer of CF, which will be turned on the
lathe to shape, and then laid over with FG, and filled, then finished
with a final layer of CF. This will get a surface coat, and fill, and
will be painted. The airframe is a 4" ID, with a 54mm MMT. The nose
cone will have a lens in it like the real thing, though I currently
have no plans for a camera, as I think that would be a somewhat dull
video, especially on a clear, windless day. The nose cone also
incorporates a similar adjustable weight system to that on Pato II.
Phoenix - My 4" Phoenix is not yet fully
designed, but according to the scale data, it should come in at about
53" in length, with a 4" ID. I am going to largely re-use the e-bay
design from the GBU-15, so there isn't a lot of work left in finishing
the model. Fin construction and Nose cone construction is going to be
identical to the GBU's. This will serve as my Level 2 rocket, after a
quick check-flight on a L1 impulse motor. Again, the adjustable weight
will be installed in the nose, and I'll see just how much motor I can
fit in it for my cert flight.
I am also working on a regulated Vacuum pump system for
all of my composite endeavours, and I will provide a writeup on it as
soon as it is done, and will collect my various sources for figuring
out what I needed, and how it was made and why. In short, this will
allow me to set a vacuum pressure to hold for the duration of cure, and
I can set it, and forget it, and the pump will cycle on and off as
needed in order to maintain the requisite pressure.
I am also considering an elevated temperature curing
oven type device, so that I can cure parts at higher temperatures, or
post-cure them to make stronger parts. I would like to get this going
soon, but we shall see. My thinking, is that with the vacuum pump, I
can now elevate the cure temperature, which increases the strength and
heat-resistance of the parts, which I couldn't do previously, because
once you put a sealed foodsaver bag in the oven, you lose your vacuum.
I would like to conncet the heating element ot a time that will control
temperature, and I can set it for different temperatures/durations so
that I can perform the entire cure/post-cure process in one bagging
cycle. Additionally, if I can get my hands on it for the fins that I
will be making, I would like to use a thermoset adhesive sheet to
adhere the honeycomb panels to the pre-cured Carbon Fiber panels, which
is the way that the pros do it. This should make for some very strong
panels that are nearly indestructible, and should easily survive any
motor I can throw at this batch of rockets.
I will do my best to keep pdates coming, but I doubt
that I will have writeups until after Plaster Blaster. I've been really
busy with construction, and planning, procurement, and design, etc., so
time is precious. Again, I will try.
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