Paul and Jean, Scaling the 3Dm surface model is a single
command operation
if you are scaling to the same scale.I looked up a few Piaggio
designs and
found the listed airfoil as a NACA 23012 at the root and a 4412 at
the tip
on both the main wing and the stabilizer and a NACA M-12 on
their P7
series. You may want to leave the wing scaled down less than the
fusaloge. Hopefully the DXF files will have the airfoil
elements plotted with
the flap amd aleiron % of chord, if not the ordinates can be
downloaded. I
search ae.illinois.edu canard airfoils and use the reverse
directory to find out what is used on airframes of similar
designs, then the
main list for the ordinates. Personally I like the Harry Riblett
airfoilson the main wing, and Rontz on the canard.
Have you got any idea what prop clearance you need at
the rotation
point on take off. I am thinking at the stall angle of attack of the
canard something like 8" clearance. It is not as much angle as
it seems
since the incidece on the canard has 3 degrees more incidence The
full size
version has five blade props so you will likely need a minimum of
threeblades with one RH and one LH to get the disk diameter scaled
down to a
workable size.
We will need to know if the CNC foam cutting shop wants
the airframe
sliced into workable size pieces or would want it as a complete
solid that
he can devide up at his location. As I remember the depth of the
machineaccomodates 20" deep sections and the width and length are
something like 5
feet by 20 feet
When you start looking for Glass cloth you might want
to call
Steve Thayer at thayercraft.com in High Point NC. I get 73 inch
wide from
him which reduces the number of seams. He has 3 million yards on
hand and
probably that much more lost to the inventory system. They ride
bicycles to
check stock quantities. He is building a Cozy and flies a Cessna 175
george grimes
Do you guys have a shop picked out for making the mold Bucks?
The cnc
machine I use is
able to cut 20" deep x 80" x 18ft long, longer if the mold can
be put on an
angle [depending
on the o/a width of the buck but upwards of 20ft would be
possible]. I'm in
the process of
getting a 5 axis head [head/head style] designed and built for
it, should
make building
molds/bucks that much easier over my current 3 axis system.
Interestingly enough, I've actually designed my own 'Piaggio'
type aircraft
but have never built
it to date. I'll send some pics of the model later today.
Jarrett Johnson
Hi Jarret where are you located and could you forward some
photos of the
equipment
Jean Prudhomme
Jean, I'm located just north of the MT/ND boarder where it hit's
Canada [in
Canada]
I've not got any photo's of the machine here [I'm at my day job
right now]
but I do have a
Youtube membership where you can see it in action.
http://www.youtube.com/watch?v=nQytmfvUc7M
Also have a website at
www.innovention-tech.com [which needs
updating one of
these days as
there have been alot more projects down the pipe than are listed
there :) ]
I've got to get some actual pic's of my mill on the site at some
point. First
I need to clean it up a bit.
It's amazing how far 75 cubic feet of foam will fly, it
currently looks like
I had a snow storm in the shop!
I've actually just finished installing a large industrial type
cyclone w/
HEPA dust filters so the snow
storms should stop, once I get the electrical interfaced [on/off
controlled by] the machine.
Btw, I do have a pic here of my Piaggio design [which I'll
attach here]
Best
Jarrett
Very interesting design and do you have some dimensions of your
design.
I am waiting for the 1/6 scale scad design dvd of PIAGGIO
I check on youtube and i also see a big rotor of Robotic CNC Solutions
on YOU TUBE
http://www.youtube.com/watch?v=1JcvCZFG0L0&NR=1
Jean Prudhomme
The model is 34ft span and 29 ft long. I didn't really follow the Piaggio design
to closely, I've found in the past that more often than not, scaling an existing
design runs a person into issues, so in this instance it was pretty much a
ground up design, based on passengers and usable load.
Lots of Cnc vid's on youtube... I've been known to spend hours [waste hrs
is more like it] looking at stuff there... pass's the time while traveling at
least :)
Jarrett
I used to program robots like those when I was working in the assembly
plants. You could probably pick up a used robot pretty cheap these days here
in Michigan with all the plant closings. A lot of versatility there in a 7
axis robot, just change the end effector, spot weld, spindle w/cutting tools,
wire welder, you name it.
Makes me wish I had some cash to set up something like that here.
C. Smith