{"product_id":"apollo-pintle-injector-tee","title":"Apollo Pintle Injector Tee","description":"\u003cp\u003e\u003cstrong\u003eDesign\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTo land on the Moon, the Lunar Module's descent engine had to throttle smoothly from full power down to a gentle hover. TRW solved it with a variable-area pintle injector. Oxidizer (nitrogen tetroxide) flowed down the centre and out past a fixed pintle as a ring of individual sprays. Fuel (Aerozine 50) left the faceplate as a thin cylindrical sheet, and the oxidizer sprays broke it up and mixed with it. A movable sleeve, linked to the flow control valves, changed the size of both openings at the same time, so the mixture stayed right at every thrust setting.\u003c\/p\u003e\n\u003cp\u003eThe engine throttled between 10% and 60% of its 10,500 lbf maximum, or ran at full thrust; the range between 65% and 92.5% was avoided to protect the nozzle. On Apollo 13 the same engine pushed the crippled spacecraft back towards Earth. The pintle injector design later went into SpaceX's Merlin engines.\u003c\/p\u003e\n\u003cp\u003eThis design shows the engine in half-section, with Detail A drawing out the injector: the fixed pintle, the movable sleeve and the two propellant paths.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eItem\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA premium tee built for both comfort and longevity. Designed with reinforced shoulder tape to keep seams stable, a ribbed knit collar that holds its shape, and a seamless construction that minimizes fabric waste while giving a refined finish. The smooth, durable cotton base is ideal for high-quality prints and feels great against the skin. Ethically sourced materials ensure every piece meets our standard for responsible production.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eCare instructions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e- Non-chlorine: bleach as needed\u003cbr\u003e- Do not iron\u003cbr\u003e- Do not dryclean\u003cbr\u003e- Machine wash: cold (max 30C or 90F)\u003cbr\u003e- Tumble dry: low heat\u003c\/p\u003e","brand":"Printify","offers":[{"title":"Black \/ S","offer_id":47891013435590,"sku":"27981069784404259639","price":39.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ M","offer_id":47891013599430,"sku":"15015509284325123490","price":39.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ L","offer_id":47891013763270,"sku":"24145134572571074349","price":39.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ XL","offer_id":47891013927110,"sku":"27906263958144359215","price":39.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ 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