What are some of the disadvantages of a forward swept Wing, on an aircraft?

Question

Eg. Su-47, Grumman X-29

Answer 1

Nice "Q"!

Rear swept wings, at most have to face an oscilation that can never bend thm beyond a certain degree (this is always within the materials ability to handle)

Forward swept wings could, in theory face  the force of being bent, in either direction, with an increasing ration of force to resistance, which could cause the wing to be torn off or bent completely backwards, rendering the plan unflyable.

The ability to overcome this, by design, causes the wing's shape to be disadvantageous in super and hypersonic situations, leaving the design's advantages far behind.

The farther forward the sweep, the greater this flaw becomes.

They sure do look cool, though!

Answer 2

major disadvantage of swept wings is that there is a spanwise flow along the wing, and the boundary layer will thicken toward the roots (the part of the wing closest to the fuselage) for sweep-forward. making it unstable at low speeds.

Answer 3

Forward-swept eliminates the wingtip vortex, thus the aircraft can dogfight in a tighter circle at higher speeds. The disadvantage of the forward-swept is the controls take a computer fly-by-wire which makes pilot decisions.

My idea of the ultimate combat aircraft will result in an airframe that looks like the pterydactyl flying dinosaur. The cockpit pod would be a forward tail aileron. That way, the aircraft could spin on it's wingtips without the pilot blacking out. A robotic glider of that shape was demonstrated on American TV.