In-flight Engine Restart
Hi,
I read somewhere that high bypass ratio engines usually require increased airspeed to provide sufficient power for restaring compared to low/medium bypass ratio engines. Why high bypass engines have less windmill or unassisted flight restart capability than low/medium bypass engines?
- What are the parameters of a windmilling engine for a low, medium, and high bypass ratio engine (let's say for JT8 D, CF6-50, and GE90, or other engines from each category)
-Since a significant numbers of incidents of all-engine flame-outs or shutdowns occured in the past, how the problem was remedy (devices & procedures) by engines and aircraft manufactors mainly at high altitudes or during certain critical phases of flight (like take-off/climb....) for a safe flight and landing?
-Will the new aircraft like A380, B787, or A350 be provided with new devices to improve inflight restart?
Thank you.
Best regards.