Ethix propellers are designed with the pilot Steele Davis and manufactured by HQProp, and their country of origin is China. For US programs subject to NDAA covered-country flow-down requirements — which reach individual components, propellers included — that typically rules foreign-made parts like these out. Whether a specific Ethix part is permitted on a specific program depends on your contract's flow-downs, so confirm with your compliance team.
Why country of origin is the deciding factor
NDAA covered-country and flow-down requirements ban federal agencies from purchasing or operating UAS — and their components — from covered foreign entities, and they extend to federal grants, contracts, and cooperative agreements. Prime contractors flow the same requirements down to their suppliers, and compliance is required at the component level, not just the system level. Our NDAA covered-country explainer covers the mechanics.
The result: for a program under these flow-downs, the question isn't whether a propeller performs well — it's where it and its materials come from, and whether you can document that.
The 5×4×3 class
The Ethix S5 is a 5×4×3, and 5.0×4.0×3 (ANV-P5040) is built to that size class in polycarbonate — same diameter, pitch and blade count, on a 5 mm bore. Drop-in means same diameter, pitch, blade count, and mount. Send the part number and platform and we'll confirm fitment at quote.
The rest of the Ethix range
The S3 and S4 (5-inch at 3.1 and 3.65 pitch), the 5.1-inch P-series and the 6-inch K2 bi-blade are sizes the catalog does not carry today; they are quoted as custom programs. Because Ethix parts are HQProp-made, the HQProp page covers the same sourcing question for the rest of that catalog.
If Ethix parts are on your BOM
- Inventory the sizes and part numbers you currently fly.
- Vet domestic replacements against the component-level compliance checklist — a US label alone is not a US supply chain.
- Send us the part numbers — we'll confirm fitment and come back with a quote.