{"id":168357,"date":"2026-03-23T22:26:01","date_gmt":"2026-03-23T20:26:01","guid":{"rendered":"https:\/\/rc-est.eu\/pood\/uncategorized\/o-s-speed-r21-m5-marine-engine-m-works\/"},"modified":"2026-04-01T22:35:57","modified_gmt":"2026-04-01T19:35:57","slug":"o-s-speed-r21-m5-marine-engine-m-works","status":"publish","type":"product","link":"https:\/\/rc-est.eu\/en\/shop\/nitro-equipment\/nitro-equipment-engines\/water\/o-s-speed-r21-m5-marine-engine-m-works\/","title":{"rendered":"O.S.Speed R21-M5 Marine Engine M-Works"},"content":{"rendered":"<p>This is the new 2026-edition Minicars Works O.S.SPEED R21-M5 3.5cc long-stroke competition engine!<br \/><strong>Features:<\/strong><\/p>\n<ul>\n<li><strong>2026 Update: New M-Works Larger Volume Cooling Head with Stainless Nipples<\/strong><\/li>\n<li>Combustion chamber with smaller volume for low nitro &amp; updated piston for easier run-in<\/li>\n<li>DLC coated &amp; balanced &#8220;SG-type&#8221; crankshaft (4.5mm balance weights)<\/li>\n<li>9-port cylinder liner with 3-port exhaust<\/li>\n<li>Backplate with steel thrust plate for lower friction and increased durability<\/li>\n<li>No carb included &#8211; choose your own carburetor (15mm diameter neck)<\/li>\n<\/ul>\n<p><strong>Suitable for competition boats (experience level \u201dhigh\u201d):<\/strong><\/p>\n<ul>\n<li>Hydroplanes<\/li>\n<li>Offshore (with gear deduction)<\/li>\n<li>Endurance (with gear reduction)<\/li>\n<\/ul>\n<p><strong>Recommended fuel:<\/strong><\/p>\n<ul>\n<li>12% nitro fuel with 8% Klotz Benol oil + 4% Original Techniplate<\/li>\n<li><em>Don&#8217;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.<\/em><\/li>\n<\/ul>\n<p><strong>Performance R21-M5 vs R21-M6:<\/strong><\/p>\n<ul>\n<li>The M5 has normal high timing numbers in the crankshaft and piston liner &#8211; the R21-M6 has more timing everywhere (more peak power but narrower power-band).<\/li>\n<li>The M5 is the highest performance out-of-the box engine for hydroplanes with direct-drive (2025 iMBRA Hydro World Champion).<\/li>\n<li>In Endurance and Offshore, the R21-M5 is easier to set-up as it&#8217;s less peaky and has more torque vs the R21-M6.<\/li>\n<\/ul>\n<p><strong>Specs:<\/strong><\/p>\n<ul>\n<li>Displacement: 3.49cc<\/li>\n<li>Bore: 16.08mm<\/li>\n<li>Stroke: 17.2mm<\/li>\n<li>Crankshaft dia: 14mm<\/li>\n<li>Practical r.p.m. Range: 4.000\uff5e43.000<\/li>\n<li>Output: 2.76hp @ 35.000r.p.m.<\/li>\n<li>Weight: 265g<\/li>\n<\/ul>\n<p><strong>Included:<\/strong><\/p>\n<ul>\n<li>O.S.Speed M-Works R21-M5 Marine Engine<\/li>\n<li>RP6 Glowplug<\/li>\n<li>O.S.Speed flywheel cone<\/li>\n<li>O.S.Speed decal<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>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<\/p>\n","protected":false},"featured_media":172312,"template":"","meta":[],"product_brand":[],"product_cat":[874],"product_tag":[],"class_list":["post-168357","product","type-product","status-publish","has-post-thumbnail","product_cat-water","first","onbackorder","taxable","shipping-taxable","purchasable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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