Bonanza 36
Flight Crew Instrument; Flight Crew Private
Flight Crew Last 90 Days 60; Flight Crew Total 3900; Flight Crew Type 3500
Inflight Event / Encounter Wake Vortex Encounter; Inflight Event / Encounter Loss Of Aircraft Control
Flight Crew Regained Aircraft Control
Procedure; Environment - Non Weather Related
On visual descent to FRG I was flying under class Bravo at 1;500 feet on a 140 heading direct to FRG. My TAS was approximately 140 knots. Winds were 270 at 10 knots and sky was clear with smooth flight conditions.  Heavier aircraft noted above and ahead on approach to runway 22 at JFK.  A 757 heavy was noted in a descending turn from E to W approximately two miles ahead and at least 500 feet above when he crossed my position.  Shortly thereafter I was struck by a tremendous burst of downward force with a rolling moment of 45 degrees to the right.  I was wearing shoulder and lap harnesses but was smashed into the headliner with enough force to suffer extreme pain in my neck and upper body causing a brief period of disorientation.  I was able to recover the aircraft and ultimately make an uneventful landing.  I reported the encounter to FRG Tower and was told that this was becoming more of a problem as ATC was now providing lower altitudes to incoming traffic on approach to runway 22 [L/R] at JFK.  Pilots need to be more aware of wake turbulence as it presents a greater threat to GA aircraft than collisions alone.  I believe that this wake turbulence could be potentially unrecoverable and possibly fatal to some types of aircraft.  Maybe a danger zone could be depicted on moving map displays that is activated through ADS-B when potential conflict are forecast by local conditions.  Similar to taxi collision shading seen on many of the Safe-Taxi charts.  Contact and traffic avoidance instructions from ATC is simply not sufficient especially if their workload does not permit.
BE36 pilot reported wake vortex encounter on approach to FRG from a B757 inbound to JFK that resulted in a hard hit and a 45 degree bank.