Delta M-Frame Fuselage Long 770 BLEM

The Delta M-Frame Fuselage Long 770 is the extended-length fuselage option in Delta Hydrofoils' modular M-Frame system, measuring 770 mm from nose to tail. Sold here as a BLEM (blemished) unit — cosmetically imperfect from shipping but never used — it comes at a discount off the standard retail price. Delta Hydrofoils is a U.S.-based foil brand known for its component-driven approach, where riders assemble a complete hydrofoil from interchangeable masts, fuselages, front wings, and stabilizers. The Longfuse 770 is the longer of two M-Frame fuselage options (the other being the Standard Fuse 610) and is specifically oriented toward wing foiling, prone foil surfing with high-aspect front wings, and distance or upwind/downwind sailing.

• Length: 770 mm
• Frame compatibility: M-Frame
• Included: Fuselage only (hardware sold separately)
• Standard retail price: $329 USD (BLEM discount applies)
• Other M-Frame fuselage option: Standard Fuse 610

The Longfuse 770 is aimed at wing foilers and prone foil surfers who pair large, high-aspect-ratio front wings with their setup. Delta states that the 770's greater cross-sectional area better handles the torque loads generated by high-aspect wings, while the added length increases pitch stability compared to the shorter 610 fuselage. That stability also makes foot transitions noticeably easier during wing foiling, which benefits intermediate riders still refining their stance changes as well as experienced riders pushing into longer-distance sessions.

Riders focused on kite foiling or using Delta's 1500 Reflex wing in surf-style conditions may find the shorter Standard Fuse 610 a better match, since its reduced length promotes quicker pitch response for pumping and carving. The 770, by contrast, suits riders who prioritize tracking, glide efficiency, and composed behavior in open-water or racing scenarios.

Within Delta's M-Frame system, the Longfuse 770 sits alongside the Standard Fuse 610 and is the fuselage Delta bundles by default in its High Aspect Complete M-Frame kits. Delta also offers a shorter 367 Medium Fuse, though that unit belongs to the separate R-Frame platform rather than the M-Frame. All M-Frame components — masts (available in 61 cm, 71 cm, 81 cm, and 91 cm aluminum lengths, plus an 81 cm carbon option), front wings, stabilizers, and the carbon top plate — are fully interchangeable, so swapping between the 610 and 770 fuselage requires no other hardware changes.

Buyers considering alternatives outside the Delta ecosystem should note that the 770 mm length is fairly standard for a "long" fuselage in the broader market; brands like Axis and Armstrong offer fuselages in similar length ranges for their high-aspect setups. The key differentiator is Delta's M-Frame mounting interface, which limits component mixing to within the Delta system.