The Night Phantom is an experimental, single seat, coaxial tip-jet helicopter that I developed to test a high-speed rotary winged concept that I've had for weeks, it's capable of reaching approximately 245 miles per hour at 66% throttle and 258 miles per hour at 70% throttle with the VTOL tab fully raised.

This is achieved thanks to a combination of features.

1: The forward tilt of the rotor assembly allows the fuselage to remain slightly more aligned with the aircraft's flight path, this reduces the amount of drag the fuselage would otherwise create if the rotor were perpendicular to the body.

2: The blades' short chord line (not to be confused with its vertical thickness) reduces the amount of downward force and drag they produce when the craft is tilted forward, allowing a larger percentage of the lift they create to be dedicated to forward motion as this allows the rotor to be tilted further forward without compromising on altitude.

3: The V-tail's angle of incidence prevents them from yielding any more downward force and drag when the vehicle is tilted forward, same phenomenon as the rotor assembly.

4: The rotors' high rotary speed. This is an obvious one for a couple of reasons, the high RPM yields more lift, and helps maintain forward motion at higher speeds where slower spinning rotors would otherwise begin pinwheeling. The technicalities on how to make a rotor spin faster than a free spinning rotator allows is still vague to me, but it seems that the more rotators you add to the rotor assembly (no matter where they're placed as long as there's radial symmetry) the faster the VTOL engine can spin the rotor.

5: The aircraft's weight, this is a critical detail that seems to be missing in almost all tip-jet helicopter designs uploaded to the site, the aircraft in this post is unusually heavy in comparison to its peers because, as counter productive as this seems, the extra weigh contributes to the helicopter's high speed by "weighing down" the vast amount of lift the aircraft's rotor creates as well as making it harder for air resistance to slow it down. A rotorcraft having all of the aforementioned features isn't going to surpass 140 miles per hour (let alone 70) if it's too light, as the amount of lift required to keep it aloft in forward flight would be too low to yield a higher top speed.

6: The most obvious of all, its drag count, keep it below 6700 and you're good to go, this can be reduced further by eliminating the weapons bays.

The helicopter's flight regime is easy to get the hang of, she uses gyroscopic controls only, up to tilt forward, down for backwards, roll to bank in your desired direction, and yaw for yaw. During high speed flight, tilting the aircraft backwards while banking makes it turn a little tighter.

AG-1 activates the gyros, AG-2 for gyroscopic yaw with roll, and AG-5 toggles the weapons bays which contain four XML edited interceptor missiles.

The trim tab is unoccupied, VTOL controls the rotors' RPM, and throttle controls collective pitch. She hovers well between 18% and 19% throttle.

I have to credit RobXDev for the fuselage, it makes for a perfect platform for this experiment.