M-works O.S.Speed R21-M5 Marinmotor M-Works
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Beskrivning
Art.nr: MW-R21M5
Product Info:
O.S.SPEED R21-M5 M-Works Marine Racing 3.5cc Engine
This is the new 2026-edition Minicars Works O.S.SPEED R21-M5 3.5cc long-stroke competition engine!
Features:
2026 Update: New M-Works Larger Volume Cooling Head with Stainless Nipples
Combustion chamber with smaller volume for low nitro & updated piston for easier run-in
DLC coated & balanced "SG-type" crankshaft (4.5mm balance weights)
9-port cylinder liner with 3-port exhaust
Backplate with steel thrust plate for lower friction and increased durability
No carb included - choose your own carburetor (15mm diameter neck)
Suitable for competition boats (experience level high):
Hydroplanes
Offshore (with gear deduction)
Endurance (with gear reduction)
Recommended fuel:
12% nitro fuel with 8% Klotz Benol oil + 4% Original Techniplate
Don't run the engine with less oil than the above recommended levels. You may add more recin/castor oil (Klotz Benol) in extreme conditions and heavy loads.
Performance R21-M5 vs R21-M6:
The M5 has normal high timing numbers in the crankshaft and piston liner - the R21-M6 has more timing everywhere (more peak power but narrower power-band).
The M5 is the highest performance out-of-the box engine for hydroplanes with direct-drive (2025 iMBRA Hydro World Champion).
In Endurance and Offshore, the R21-M5 is easier to set-up as it's less peaky and have more torque vs the R21-M6.
Specs:
Displacement: 3.49cc
Bore: 16.08mm
Stroke: 17.2mm
Crankshaft dia: 14mm
Practical r.p.m. Range: 4.000～43.000
Output: 2.76hp @ 35.000r.p.m.
Weight: 256g
Included:
O.S.Speed M-Works R21-M5 Marine Engine
RP6 Glowplug
O.S.Speed flywheel cone
O.S.Speed decal
O.S.SPEED R21-M5 M-Works Marine Racing 3.5cc Engine
This is the new 2026-edition Minicars Works O.S.SPEED R21-M5 3.5cc long-stroke competition engine!
Features:
2026 Update: New M-Works Larger Volume Cooling Head with Stainless Nipples
Combustion chamber with smaller volume for low nitro & updated piston for easier run-in
DLC coated & balanced "SG-type" crankshaft (4.5mm balance weights)
9-port cylinder liner with 3-port exhaust
Backplate with steel thrust plate for lower friction and increased durability
No carb included - choose your own carburetor (15mm diameter neck)
Suitable for competition boats (experience level high):
Hydroplanes
Offshore (with gear deduction)
Endurance (with gear reduction)
Recommended fuel:
12% nitro fuel with 8% Klotz Benol oil + 4% Original Techniplate
Don't run the engine with less oil than the above recommended levels. You may add more recin/castor oil (Klotz Benol) in extreme conditions and heavy loads.
Performance R21-M5 vs R21-M6:
The M5 has normal high timing numbers in the crankshaft and piston liner - the R21-M6 has more timing everywhere (more peak power but narrower power-band).
The M5 is the highest performance out-of-the box engine for hydroplanes with direct-drive (2025 iMBRA Hydro World Champion).
In Endurance and Offshore, the R21-M5 is easier to set-up as it's less peaky and have more torque vs the R21-M6.
Specs:
Displacement: 3.49cc
Bore: 16.08mm
Stroke: 17.2mm
Crankshaft dia: 14mm
Practical r.p.m. Range: 4.000～43.000
Output: 2.76hp @ 35.000r.p.m.
Weight: 256g
Included:
O.S.Speed M-Works R21-M5 Marine Engine
RP6 Glowplug
O.S.Speed flywheel cone
O.S.Speed decal