Variants
- Koppen-Bollinger Helioplane.
- Original prototype soon re-named Helio Courier.
- Helioplane Four.
- unknown possible variant.
- Helioplane Two.
- unknown possible variant.
- Hi-Vision Courier.
- unknown possible variant.
- H-291.
- Prototype, one built.
- H-295 Super Courier.
- Variant with a Lycoming GO-480-G1D6, purchased by USAF as U-10D, 173 built.
- HT-295 Super Courier or Trigear Courier.
- H-295 with tricycle undercarriage, 19 built.
- H-250 Courier.
- H-295 with lengthened fuselage and Lycoming O-540-A1A5 engine, 41 built.
- H-391 Courier.
- Prototype with Lycoming GO-435-C2 engine, one built.
- H-391B Courier.
Production version of H-391, 102 built.
- H-392 Strato Courier.
- High-altitude version of H-391 with Lycoming GSO-480-A1A5 engine (340 hp).
- H-395 Super Courier.
- H-391B with Lycoming GO-480-G1D6, purchased by USAF as U-10A and U-10B, 138 built.
- H-395A Courier.
- Variant of the H-395 with a Lycoming GO-435-C2B6 engine, seven built.
- H-500 Twin Courier.
- Twin-engined H-395 for the CIA. Very little information available except seven delivered to the CIA under front designation U-5.
- Helio H-550 Stallion.
- Turboprop powered development
- H-580 Twin Courier.
- A longer nosed H-500 with twin wing mounted piston engines, five built.
- H-634 Twin Stallion
- Planned twin Allison C250 powered Stallion.
- H-700 Courier.
- H-295 with redesigned wing and undercarriage and Lycoming TIO-540-J2B engine.
- H-800 Courier.
- H-700 with Lycoming IO-720-A1B engine, 18 built (H-700 and H-800 together).
- L-24 Courier.
- Military version of the H-391 Courier.
- L-28 Courier.
- Military version of the H-395 Courier.
- U-5 Twin Courier.
- Probable front designation for CIA Twin Couriers.
- U-10 Courier
- Re-designation of L-28 Courier
- U-24 Stallion
- Military designation for H-550 Stallion
Read more about this topic: Helio Courier
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