KAVAN FS-91AR Four-Stroke Engine – Smooth, Powerful Performance for Scale RC Aircraft
Available at Aerobertics
The KAVAN FS-91AR is a high-performance four-stroke engine, perfect for sporty, aerobatic, and especially scale model aircraft. Known for its reliable operation, easy running-in, and simple fine-tuning, this engine is ideal for enthusiasts who love the classic deep “puffing” sound of a four-stroke. With proper care and maintenance, the FS-91AR provides long-lasting, dependable performance for years of flying enjoyment.
Key Features and Performance
- Classic Ringed Glow Plug Design: Durable and efficient for scale and sport models
- Twin-Needle RC Carburetor with Choke: Smooth operation and precise tuning
- Muffler Included: Optimized for quieter operation
- Crankshaft Thread: UNF 5/16-24 propeller nut/bolt, with included safety propeller lock nut
- Displacement: 14.95 ccm
- Operating RPM: 2,000–11,000
- Motor Power (10,500 RPM): 1.3 kW
- Weight: 640 g
Recommended Propellers and Fuel
Propellers:
- Running-in: 13×8"
- Sport & Aerobatic: 12×10", 12×11"
- Scale: 15×6", 16×6"
Fuel Tank Volume: 350–400 ml
Fuel:
- Recommended for running-in: KAVAN 4T Air 5% nitro
- After break-in: KAVAN 4T Air 10–15% nitro
- Castor-based fuels should contain at least 18% castor oil (or castor/synthetic blend) and 5–15% nitromethane. Using a small nitromethane content ensures high reliability and easier carburetor adjustments under varying environmental conditions.
Recommended Glow Plugs:
- KAVAN GP-1
- O.S. MAX Type F
- KAVAN Premium No.4T
Why Aerobertics Recommends the FS-91AR
At Aerobertics, we trust KAVAN four-stroke engines for their smooth performance, authentic sound, and long-term reliability. The FS-91AR is perfect for scale enthusiasts who want realistic, controllable, and enjoyable flying experiences. From aerobatic maneuvers to detailed scale flight, this engine delivers confidence, consistency, and the unmistakable charm of a classic four-stroke.
