Plus Designs Inc.

Plus Designs Inc., a Phoenixville, Pennsylvania-based for-profit Subchapter S corporation, delivers advanced materials research and engineered propulsion technology development to Department of Defense agencies as a prime contractor exclusively under total small business set-asides. The firm operates entirely in the SBIR and STTR program space, competing in Phase I and Phase II efforts focused on high-temperature thermal management, ceramic components, and rotating detonation propulsion systems.

Plus Designs' customer concentration is heavily weighted toward defense R&D agencies. The Missile Defense Agency leads by both award count and dollars, holding five awards valued at $4.8 million combined, including a March 2026 definitive contract for engineered printed propulsion technology with geometry-based thermal management ($2.0 million, cost-plus-fixed-fee, completion March 2028) and an April 2023 SBIR/STTR Phase II effort for engineered printed propulsion technology research ($1.49 million, cost-plus-fixed-fee, completion February 2027). The Air Force Research Laboratory accounts for two awards totaling $2.5 million — an August 2023 Phase II contract for advanced non-eroding components for rotating detonation rocket engines ($1.25 million, cost-plus-fixed-fee, completion September 2026) and an August 2023 Phase II contract for high-temperature hybrid braided rope seals ($1.25 million, firm-fixed-price, completion June 2027). The Defense Advanced Research Projects Agency holds two awards ($1.4 million combined), with a June 2022 Phase II SBIR for segmented structural ceramics ($1.24 million, cost-plus-fixed-fee, completion August 2026). The NASA Shared Services Center and U.S. Special Operations Command round out the customer set with one award each.

Plus Designs holds no position on government-wide vehicles, BPAs, or agency IDIQs; all awards are direct task orders under SBIR/STTR authority. Award activity shows a sustained but modest cadence — one award in 2021, one in 2022, three in 2023, one in 2024, and one in 2026 — across an $9 million total potential value portfolio. Three awards (combined potential value $4.7 million) face ultimate completion within the next twenty-four months, representing near-term recompete exposure. The firm operates exclusively as a prime contractor with no visible subcontractor footprint across the source data. Capability delivery centers on materials engineering, thermal systems analysis, and prototype development for next-generation defense propulsion and structural applications, with work performed in Phoenixville, Pennsylvania.

Plus Designs, Inc. (PDI) provides design and analysis engineering consulting services with emphasis on advanced materials, including composite materials, refractory metals, and refractory ceramics, to support the high temperature materials community in the aerospace and defense industry. Over nineteen years of aerospace engineering experience with composite materials, refractory metals, and refractory ceramics research supporting the development of advanced design solutions for extreme environment applications. Relevant thermal-structural design and analysis experience with a variety of refractory non-metals/metals, oxides, carbides, borides, nitrides, alloys, superalloys, and composite materials including orthogonal weaves, polar weaves, braiding, involutes, filament winding, 2D layups, 4D layups, and needling. (Approved Militarily Critical Technical Data Agreement, DD Form 2345.)