Issue link: https://te.mouser.com/i/1472768
5 AEROSPACE / WHITE PAPER CONNECTING THE FUTURE OF FLIGHT Crosstalk There is no crosstalk within an SPE cable due to the inherent crosstalk immunity of a single twisted-wire pair (not so with two pairs of wire in quadrax or four pairs with traditional Cat 5e or 6a cables). Alien crosstalk—i.e., crosstalk between two adjacent cables—poses little concern if shielded cables are used by offering the same crosstalk-noise-reduction properties obtainable with 100BASE-T1 links depending on the shield configuration. Immunity to electromagnetic interference (EMI) aligns with 100BASE-T1 specifications. SWAP APPLICABILITY Compared to heftier, enterprise-grade Ethernet 100BASE-TX (100 Mbps), 1000BASE-T (1 Gbps), and 10GBASE-T (10 Gbps) networks that use four unshielded twisted wire pairs (UTP), a two- wire SPE cable weighs nearly 50 percent less. The resulting weight savings in civilian aircraft is significant. For example, take the case of a wide- body commercial jet, such as a Boeing B747-400 aircraft, flying a 5,000 nautical-mile average stage length for 3,000 flight hours per year. If the total weight of all wiring and connectors is calculated to be 1,814 kg (4,000 lbs), then hauling that mass consumes nearly 60,000 gallons of jet fuel annually. The annual fuel cost value for that amount of fuel comes to $115,800 USD. The annual CO₂ emissions from burning that much fuel amount to 2,785,200 kg (1,266,000 lbs) annually—the equivalent of automobile emissions from 124 passenger vehicles.¹ The effect of weight on eVTOL aircraft is different. In conventional aircraft, weight is optimized for long-range endurance. Approximately one-third of takeoff mass is lost during fuel burn at takeoff. In battery- powered eVTOLs, weight remains constant for the entire flight (some weight variance occurs in hybrid UAM aircraft). Payloads weigh less, and passengers are fewer. The range is shorter, covering distances over city blocks or a cityscape. UAM/AAM AIRCRAFT TYPE QUADROTOR SIDE-BY-SIDE TILTWING Number of passengers 1 6 15 Trapped fluids 5 10 20 Automatic flight control 40 40 40 Instruments 10 10 10 Mission equipment 40 40 40 Electrical (10lb Plus 10lb/Person) 20 70 160 Environmental 15 90 225 Furnishings 31 178 443 Total system weight 161 438 938 Percent system weight contributed by electrical/electronic components 68% 37% 27% FIG 2: Sources of system weights (in pounds) in various UAM aircraft. ²