modern armor is incredibly resistant to spalling. HESH rounds, the high-tech version of sticky dynamite, have fallen out of favor in preference to kinetic penetrators and shaped charges.
the hardest part of applying anti-tank munitions to a tank is getting close to the tank. so, they're generally projectile weapons.
man-portable devices have size and recoil limits that immediately rule out kinetic penetrators.
shaped charges work at lower velocity, but are massive and conical, so they mostly have to be rockets fired from a recoilless launcher.
there has probably been some work trying to deliver shaped charges via drone to reduce launch signature, but that would be much slower, more costly, vulnerable to active defenses, and vulnerable to electronic countermeasures.
eventually if your drone is small and fast enough, it's a missile, and if it's big enough to launch from out of reach, you just launch it from an airfield, and we already do both of those.
the hardest part of applying anti-tank munitions to a tank is getting close to the tank. so, they're generally projectile weapons.
man-portable devices have size and recoil limits that immediately rule out kinetic penetrators.
shaped charges work at lower velocity, but are massive and conical, so they mostly have to be rockets fired from a recoilless launcher.
there has probably been some work trying to deliver shaped charges via drone to reduce launch signature, but that would be much slower, more costly, vulnerable to active defenses, and vulnerable to electronic countermeasures.
eventually if your drone is small and fast enough, it's a missile, and if it's big enough to launch from out of reach, you just launch it from an airfield, and we already do both of those.