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Universal Rocket Module
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<p>Universal Rocket Module (URM) is the name of the modular <a href="/facts/Liquid_rocket/TAonrVDn">liquid fuelled</a> first and second stage of the <a href="/facts/Angara_(rocket_family)/fwnzPNpF">Angara</a> <a href="/facts/Expendable_launch_system/CaW43W5z">expendable launch system</a>. The first stage and booster variant is referred to as URM-1, while the second stage is referred to as URM-2. The URM-2 is derived from the <a href="/facts/Soyuz-2_(rocket)/U3nHlUKx">Soyuz-2</a> Block I second stage. </p><p>URM-1 is a unitary structure 2.9 meters in diameter and 25 meters in length that includes an oxidizer tank, a fuel tank (both tanks being coupled by a spacer) and an <a href="/facts/RD-191/uEko9DN7">RD-191</a> engine burning <a href="/facts/RP-1/wDI7vNdu">RP-1</a> fuel with <a href="/facts/Liquid_oxygen/qnI0KDTb">liquid oxygen</a> producing a thrust of 1.92 <a href="/facts/Newton_(unit)/Ral9XgNl">MN</a>. URM-1 was first flown in 2014 on the <a href="/facts/Angara-1.2pp/YtXPdEvm">Angara 1.2PP</a> suborbital test flight. Angara can fly with either one URM-1 in the case of <a href="/facts/Angara_1.2/fwnzPNpF">Angara 1.2</a> and Angara 1.2PP, or one URM-1 as a sustainer core with four additional URM-1s as boosters for <a href="/facts/Angara_A5/fwnzPNpF">Angara A5</a>. </p><p>URM-2 is a modified Block I stage, 3.6 meters in diameter and 6.9 meters in length. It is powered by a single RD-0124A producing 294 kilonewtons, derived from Block I's <a href="/facts/RD-0124/ILX2UYV3">RD-0124</a>. URM-2 was first flight tested on Angara 1.2PP, but will fly in operation only on the <a href="/facts/Angara_A5/fwnzPNpF">Angara A5</a>. The operational <a href="/facts/Angara_1.2/fwnzPNpF">Angara 1.2</a> will also use a modified Block I powered by the RD-0124A as a second stage, though this stage will have a diameter of no more than 2.9 meters. </p><p>The <a href="/facts/Naro-1/36nknI96">Naro-1</a> <a href="/facts/Launch_vehicle/g1GCGFJB">launch vehicle</a> was based on the URM-1 with a reduced thrust <a href="/facts/RD-191/uEko9DN7">RD-191</a>, called RD-151, combined with a solid-fueled second stage built by <a href="/facts/South_Korea/pCobAaVw">Republic of Korea</a> <a href="/facts/Korea_Aerospace_Research_Institute/07560nHx">KARI</a>. </p>