{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:FEEE4UNLVRQJX5XWGCBTGJZJZ6","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"4c81d62ad7ae3e6378dc0241b2a985d85ef74cf451b45ec73498e7d83d4c4594","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-03-28T15:51:41Z","title_canon_sha256":"f09a73dc55873033a389b770e757c00a792c4d8c9b426d34ca72c7c1fb453568"},"schema_version":"1.0","source":{"id":"1803.10695","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.10695","created_at":"2026-05-18T00:08:42Z"},{"alias_kind":"arxiv_version","alias_value":"1803.10695v2","created_at":"2026-05-18T00:08:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.10695","created_at":"2026-05-18T00:08:42Z"},{"alias_kind":"pith_short_12","alias_value":"FEEE4UNLVRQJ","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"FEEE4UNLVRQJX5XW","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"FEEE4UNL","created_at":"2026-05-18T12:32:22Z"}],"graph_snapshots":[{"event_id":"sha256:f65ed1186b9e9330f2632f9f2485ef3e729403db179e78f41f36041ee8d3f702","target":"graph","created_at":"2026-05-18T00:08:42Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Empirical data reveals a broad variety of hull shapes among the different ship categories. We present a minimal theoretical approach to address the problem of ship hull optimisation. We show that optimal hull aspect ratios result -- at given load and propulsive power -- from a subtle balance between wave drag, pressure drag and skin friction. Slender hulls are more favourable in terms of wave drag and pressure drag, while bulky hulls have a smaller wetted surface for a given immersed volume, by that reducing skin friction. We confront our theoretical results to real data and discuss discrepanc","authors_text":"Christophe Clanet, Jean-Philippe Boucher, Michael Benzaquen, Romain Labb\\'e","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-03-28T15:51:41Z","title":"Thin or bulky: optimal aspect ratios for ship hulls"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.10695","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:8f97304b0ee681e80efd4abfd1be7dfbef33e569391f457c4f368bd6204acdc8","target":"record","created_at":"2026-05-18T00:08:42Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"4c81d62ad7ae3e6378dc0241b2a985d85ef74cf451b45ec73498e7d83d4c4594","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2018-03-28T15:51:41Z","title_canon_sha256":"f09a73dc55873033a389b770e757c00a792c4d8c9b426d34ca72c7c1fb453568"},"schema_version":"1.0","source":{"id":"1803.10695","kind":"arxiv","version":2}},"canonical_sha256":"29084e51abac609bf6f63083332729cfb1452aae6d33a829e897ef8eade4fd61","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"29084e51abac609bf6f63083332729cfb1452aae6d33a829e897ef8eade4fd61","first_computed_at":"2026-05-18T00:08:42.790629Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:08:42.790629Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4palaAN2ZGAvxUhMSI67jtimuue7b7Fmxz3qSfoA7Db/oF/1ocPduJJd8b1WZVKtimWGVtv5gnxBqwPe8LVWAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:08:42.791324Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.10695","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8f97304b0ee681e80efd4abfd1be7dfbef33e569391f457c4f368bd6204acdc8","sha256:f65ed1186b9e9330f2632f9f2485ef3e729403db179e78f41f36041ee8d3f702"],"state_sha256":"45dfdcd10f23a4553a231275c200c3acf576c98446655289bf00990f5217a1fd"}