Hi Pete,
I removed the picture because I first want to obtain permission from the
photographer
that took it. Once I have that will post again.
On the RPM part thanks for the heads up. Yes, I am familiar with that subject
but
I have decided that I will run my engine at 4900 RPM unless I am trying to
get somewhere fast. It just gets too noisy and I don't like it. My suspicion is
that there are resonant modes in the airframe that amplify noise and vibration
over 5000 RPM and I don't like it. I have done a few cross countries at 5200
RPM and its fun because of the speed (I loose a full 10 knots between 4900 and
5200) but it's tiring. I also fly a lot of formation flight with airplanes
that are slower and that forces me to back-off on the RPM. Time will tell.
On the cushion side of things, right now I have a prototype installed (yes, I am
taking it that seriously because I am getting sore butt from sitting in this
thing).
The prototype is made with PU foam to test. The intent is to go with Confor foam
on the bottom for protection and to reduce pressure points on the final
iteration.
The rest is firm PU foam to keep it light. The biggest challenge was to
keep the torso to thigh angle at 95 or over but couldn't achieve that. I got
around 90 but kept the foam on the distal thighs soft to try to get a little
more
angle. The yellow stuff in the picture is PU foam. Dark blue is PE foam piece
that I hotwired to get the proper bottom angle. The pink, light blue and green
layers are Confor.
I wanted to minimize the Confor foam but in my PU prototype I get a pressure
point
on my right tuberosity (butt bone) and I think it is attributed to the 90
angle and leaning toward the center of the cockpit because your left arm is
hitting
the door frame. I think the Confor foam will help.
The surfaces are flat. No bolsters (makes them a little ugly) but that will
allow
some repositioning during flight and allow leg sprawling (important in our
plane and for comfort). It also keeps them simple.
Picture of my CAD design attached and I hope it helps. I will report how it
comes
out when I build the final ones and test them.
Attached is
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502982#502982
Attachments:
http://forums.matronics.com//files/europa_cushion_design_206.jpg
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