{"product_id":"estes-rockets-f15-4-engines-29-mm-2pk","title":"Estes Rockets - F15-4 Engines (29 mm) (2pk)","description":"\u003cp\u003eThe Estes F15-4 engine delivers high-thrust power and long burn times, making it a reliable choice for mid-power rockets. With a 4-second delay, it’s optimized for heavier, single-stage rockets needing a smooth boost-to-deploy transition.\u003c\/p\u003e\n\u003cp\u003eBuilt for performance, the F15-4’s extended 3.45-second thrust duration provides impressive altitude gains, while the 29 mm casing ensures compatibility with a wide range of larger rockets. It’s an ideal choice for modelers ready to step up from D and E engines.\u003c\/p\u003e\n\u003cdl\u003e\n\u003cdt\u003eIncludes:\u003c\/dt\u003e\n\u003cdd\u003e- 2 F15-4 Engines\u003c\/dd\u003e\n\u003cdd\u003e- 2 Starters\u003c\/dd\u003e\n\u003cdd\u003e- 4 Starter Plugs\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003cdiv data-core-is=\"block\" class=\"ecom-block ecom-core core__block elmspace ecom-iag81uutdh\"\u003e\n\u003cdiv data-stopdrag=\"true\" class=\"ecom__element element__heading ecom-element ecom-html\"\u003e\n\u003ch2 class=\"ecom__heading ecom-db\"\u003eOverview\u003c\/h2\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv data-core-is=\"block\" class=\"ecom-block ecom-core core__block elmspace ecom-bpdbfpj6h6 short-description\"\u003e\n\u003cdiv class=\"ecom-element ecom-product-single ecom-product-single__description\"\u003e\n\u003cdiv class=\"ecom-product-single__description-wrapper\"\u003e\n\u003cdiv data-show-type=\"full\" class=\"ecom-product-single__description-container\"\u003e\n\u003cdiv class=\"ecom-product-single__description--paragraph\"\u003e\n\u003cdiv class=\"ecom-html-des\"\u003e\n\u003cp\u003eTake your flights to the next level with the Estes F15-4 engine—a powerful mid-power engine designed for model rocket enthusiasts seeking longer thrust duration and higher lift capabilities. With 49.61 N-sec of total impulse and a max thrust of 25.26 Newtons, this engine is built to launch heavier rockets to stunning altitudes with confidence and control.\u003c\/p\u003e\n\u003cp\u003eThe F15-4 offers more than just raw power—it’s engineered for dependable, sustained flight. The 4-second delay provides a balanced coast period after burnout, ideal for deploying parachutes or other recovery systems at peak altitude. Its long 3.45-second thrust duration gives your rocket a smooth, graceful ascent, minimizing stress on airframes while maximizing trajectory efficiency.\u003c\/p\u003e\n\u003cp\u003eThis engine is a popular choice for larger rockets in the Estes Pro Series II line and other compatible 29 mm models. Its consistent performance makes it an excellent pick for hobbyists looking to upgrade from E-class engines while staying within the ease of single-use, black powder propulsion. Whether you're launching for sport, altitude records, or payload testing, the F15-4 delivers dependable performance every time.\u003c\/p\u003e\n\u003cp\u003eWith its powerful thrust profile, long burn, and mid-delay deployment, the Estes F15-4 is perfect for high-performance rockets weighing up to 21 ounces. Expand your launch capabilities and experience the next level of model rocketry excitement with this hard-working engine.\u003c\/p\u003e\n\u003cp\u003eCompatible Rockets\u003cbr\u003ePro Series II Doorknob\u003cbr\u003ePro Series II Der Big Red Max\u003cbr\u003ePro Series II Nike Smoke\u003cbr\u003ePro Series II Optima\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv data-core-is=\"block\" class=\"ecom-block ecom-core core__block elmspace ecom-jarn3n4g13 hide-on-mobile\"\u003e\n\u003cdiv data-stopdrag=\"true\" class=\"ecom__element element__heading ecom-element ecom-html\"\u003e\n\u003cp class=\"ecom__heading ecom-db\"\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eTotal Impulse\u003c\/strong\u003e\u003cbr\u003e49.61 N-sec\u003cbr\u003e\u003cstrong\u003eTime Delay\u003c\/strong\u003e\u003cbr\u003e4 Seconds\u003cbr\u003e\u003cstrong\u003eMax Lift Weight\u003c\/strong\u003e\u003cbr\u003e21.0 oz (595 g)\u003cbr\u003e\u003cstrong\u003eMax Thrust\u003c\/strong\u003e\u003cbr\u003e25.26 Newtons (5.7 lbs)\u003cbr\u003e\u003cstrong\u003eThrust Duration\u003c\/strong\u003e\u003cbr\u003e3.45 Seconds\u003cbr\u003e\u003cstrong\u003eLength\u003c\/strong\u003e\u003cbr\u003e4.5 in. (11.4 cm)\u003cbr\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003cbr\u003e29 mm\u003cbr\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003cbr\u003e3.59 oz. (101.8 g)\u003cbr\u003e\u003cstrong\u003ePropellant Weight\u003c\/strong\u003e\u003cbr\u003e2.12 oz (60.0 g)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eATTENTION:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eEstes Industries, LLC and Echo Six LLC requires all purchasers and users of Estes® Model Rocket Engines to adhere strictly to all applicable local, state, and federal laws, regulations, and safety standards. The user assumes all responsibility for the safe and lawful use of Estes® products. Estes Industries, LLC and Echo Six LLC expressly disclaims any and all liability for personal injury, property damage, or other loss resulting from the misuse, improper handling, or unauthorized application of its model rocket engines.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eThese engines cannot be sent to post office boxes. Please be sure to provide a PHYSICAL ADDRESS when purchasing E and F sized engines.\u003c\/p\u003e\n\u003cp\u003eE and F sized engines cannot be shipped to Alaska, Hawaii, Puerto Rico or Guam.\u003c\/p\u003e","brand":"Echo Six Hobbies","offers":[{"title":"Default Title","offer_id":54331951382841,"sku":"EST10031","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0064\/5686\/8948\/files\/F15-4-Engines-Package.webp?v=1786805357","url":"https:\/\/fandomcomicshop.com\/products\/estes-rockets-f15-4-engines-29-mm-2pk","provider":"Fandom Comic Shop","version":"1.0","type":"link"}