Gull wing — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/gull-wing/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Catalog version: 2026-10-20

Sizes: see table below
- A gull wing rises steeply from the root, then flattens outboard. On the PBM Mariner flying boat the gull wing 'kept the vulnerable engines out of the salt spray' and avoided the external bracing a parasol wing like the Catalina's needed (Smithsonian NASM).
- Wainfan notes changes at the wingtips matter more for lateral stability than changes near the root, and part-span dihedral needs slightly more outer-panel dihedral to match a constant-dihedral wing (Kitplanes).
- Used on: Martin PBM Mariner.
- The file is a reference example built by Xem Studio from the numbers above. Sizes the sources do not fix are illustrative; scale the example to your own vehicle.

parameter  value or range  source
PBM Mariner wing  gull wing on deep hull; engines above spray  Smithsonian NASM
Part-span dihedral rule  outer panels need slightly more dihedral  Kitplanes (Wainfan)
Reference build angles  illustrative (no published angle fetched)  illustrative

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Smithsonian National Air and Space Museum: Martin PBM-5A Mariner — web — Publisher's page; dimensions are facts — https://si.edu/object/martin-pbm-5a-mariner:nasm_A19730270000
- Kitplanes (B. Wainfan): Wind Tunnel: Roll's role in lateral stability (2008) — web — Publisher's page; dimensions are facts — https://www.kitplanes.com/wind-tunnel-135/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/gull-wing/index.json
API: https://xemstudio.com/api/geometry?object=gull-wing