The aircraft owner who installed the modified fuel system stated that the 3D-printed induction
elbow was purchased in the USA at an airshow, and he understood from the vendor that it
was printed from CF-ABS (carbon fibre – acrylonitrile butadiene styrene) filament material,
with a glass transition temperature3
of 105°C.
An alternative construction method for the air induction elbow, shown in the Cozy Mk IV
plans, is a lamination of four layers of bi-directional glassfibre cloth with epoxy resin. The
epoxy resin specified for the laminate has a glass transition temperature of 84°C, after the
finished part has been post-cured. The aircraft owner stated that as the glass transition
temperature listed for the CF-ABS material was higher than the epoxy resin, he was satisfied
the component was fit for use in this application when it was installed.
A review of the design of the laminated induction elbow in the Cozy Mk IV plans showed
that it featured a section of thin-walled aluminium tube at the inlet end of the elbow, where
the air filter is attached. The aluminium tube provides a degree of temperature-insensitive
structural support for the inlet end of the elbow. The 3D-printed induction elbow on G-BYLZ
did not include a similar section of aluminium tube at the inlet end.
I've been out of the industry for a few years, but can anyone explain how L1 RAN processing can be done 'in the cloud' without back-hauling huge amounts of raw RF data to a data-center?
I recommend reading 'Being Mortal' by Atul Gawande for some good insights into dealing with end-of-life issues. My wife & I found this very helpful in making decisions around the care of her aging father.
The fingerprint is derived from the aggregate size of all packets that comprise a segment of video (what the researchers call an ADU),
Some possible counter-measures are discussed in the conclusion:
"To that end, we believe that Netflix could defend against passive traffic analysis by ensuring that the byte-range portion of the
HTTP GETs sent by the browser do not perfectly align with
individual video segment boundaries. For instance, the browser
could average the size of several consecutive segments and send
HTTP GETs for this average size. As an alternative approach, the
browser could randomly combine consecutive segments and send
HTTP GETs for the combined video data. Designing obfuscation
techniques for VBR DASH streams that do not degrade video
quality remains a potential area for future research."
For 3G/4G networks there is strong mutual authentication between the device and the network, for 2G(GSM) networks only the device is authenticated so these interception devices work by jamming the 3G/4G bands forcing the device onto the (fake) 2G network.
Here is a nice write-up on how 802.11x security was provided to attendees at 32C3 (they used TTLS with no client certs and users could choose their own user/passwords anonymously)