B.J. Schramm’s Sleek Single Seat Javelin Helicopter

Javelin helicopter

Single Seat Kit Built Helicopter Prototype

ARTICLE DATE: August 1966

Schramm’s Sleek Single-Seater Javelin Helicopter …a Cutie Copter

Javelin experimental home made helicopter

Single-seater has cyclic stick, pedals for tail rotor control and collective stick left of seat. Gauges are altimeter, temperature and rpm. Skin comes off in 4 min.

Buford J. Schramm of South San Gabriel, Calif., expects to market this single-seater “advance-design” Javelin helicopter after certification in 1968 at the low price of $8,000 to $10,000.

Schramm, the 27-year-old designer, claims the price is possible because his “Javelin” uses less than half the parts found in other helicopters. His “Tractable Control Rotor”, for which patents are pending, has but a half dozen parts plus a few bearings.

built your own personal helicopter

Nuts-and-Bolts Dept: (A) Mercury outboard powerplant (B) Swashplate (C) Chain and sprocket drive (D) V-belt and reduction (E) Tail rotor boom (F) Tail rotor drive (H) Radiator (J) Main rotor shaft (K) Walking beam (L) Straps holding blades (M) Collective control cable.

Rotor blades are laminated; Schramm does not divulge the materials. Airframe is of chromemoly tubing, tail boom is aluminum tube. The prototype has aluminum skins on the cockpit; production versions will have fiberglass covering.

The present aluminum body can be stripped from the airframe in less than 4 minutes, the entire helicopter disassembled in less than 90 minutes. Another feature of Javelin is its take-it-home capabilities for garaging.

To date, some $90,000 to $100,000 has been expended on its development. Schramm expects to have 21 ships in the hands of dealers by the end of the first year following certification, hopes to produce a-ship-per-day during his second year.

“Javelin” Helicopter Specifications & Performance:

Versatile DIY helicopter

LEFT: Trailer (below, in background) permits garage storage.
RIGHT: Prototype employs outboard engine for powerplant, radiator for water cooling, latter located aft of cockpit under tail boom.

Javelin Helicopter Main Rotor

  • Main rotor diameter 21.4-ft;

  • Main rotor blade cord 7.25-in;

  • Main rotor airfoil NACA 0015;

  • Main rotor area 14-sq ft.

Javelin Helicopter Tail Rotor

  • Tail rotor diameter 3.7-ft; blade rpm 2500;

  • airfoil NACA 0015.

B J Schramm flying Javelin helicopter

Javelin Helicopter General Specifications

  • Empty weight 500-lbs;

  • gross 880-lbs;

  • fuel capacity 12-gals.

  • Disc loading 2.3-lb/sq ft;

  • power loading 8.8-lbs/hp;

  • engine 100-hp Continental 0-200 (prototype is fitted with a 100-hp Outboard Marine “Mercury”).

Javelin Helicopter Performance

  • Max speed 85-mph;

  • endurance 2.25-hrs;

  • hover ceiling 5,000-ft in ground effect, out of ground effect 3,500-ft;

  • rate of climb 1200-ft/min;

  • auto-rotation rate of descent 1250-ft/min;

  • service ceiling 11,500-ft.

build your own javelin one man helicopter

Nuts-and-Bolts Dept: (A) Mercury outboard powerplant (B) Swashplate (C) Chain and sprocket drive (D) V-belt and reduction (E) Tail rotor boom (F) Tail rotor drive (H) Radiator (J) Main rotor shaft (K) Walking beam (L) Straps holding blades (M) Collective control cable.

Summary
B.J. Schramm's Sleek Single Seat Javelin Helicopter
Article Name
B.J. Schramm's Sleek Single Seat Javelin Helicopter
Description
Back when homebuilt helicopters were in their prime and inventors were experimenting with all that was available. B.J. Schramm's Javelin helicopter was one of those amazing little machines that evolved into a massive homebuilt helicopter industry.

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