# FN-LAB-DESK v0.2 / tabletop surface-flow demonstrator

User ceiling: THB 20,000. Nominal total envelope 1640 L x460 W x~460 H mm.
Clear test section 300 W x250 H x350 L mm. Table assumed >=1800 x600 mm,
level and adequately load-rated, with free space for inlet/outlet airflow.

## Status
Design-review / RFQ package, NOT a manufacturing or electrical release.
CAD is real editable geometry; functional performance has not been tested.
No purchasing has been made. Fan ports / holes, roof clips, module sealing,
support heights, fastener edge distances and electrical installation remain holds.
Do not send developed DXFs directly to a cutter without shop review.

## Files
- cad/FN-LAB-DESK-v0.2-assembly.step: named component assembly
- cad/FN-LAB-DESK-v0.2-exploded.step: exploded assembly
- cad/parts/: individual STEP solids; A03/A04 STL mount mockups only
- cad/build_cad.py: editable CadQuery 2.6.1 generator; dimensions in millimetres
- data/parameters.json: parameter reference (edit dictionary P in generator)
- drawings/dxf/: nominal developed profiles, 1:1 mm, no kerf or nesting
- drawing-pack PDF: A3 assembly / GA / panels / mount / budget / commissioning
- parts-register.csv: every CAD component and scope
- BOM-budget-THB.csv: 20 procurement work packages and spending allowances
- hardware-schedule.csv: individual fastener planning quantities / interfaces

## Budget
18,700 THB planned +1,300 contingency =20,000 ceiling.
These are allowances, not confirmed vendor prices. RFQ VAT-inclusive landed
prices before purchase. Existing phone, table, basic tools and DIY assembly
supplied by owner. Excludes force balance / DAQ / automatic motion / smoke,
paid full-build labour, finalized aircraft CAD, calibration-lab service.
If mandatory fan/guards/electrics cost exceeds allowances, revise scope or RFQ;
do not remove guards or electrical protection to fit the cap.

## What this tunnel can study
Tufts on a small model / isolated-wing coupon, static angle changes, qualitative
surface-flow patterns. Start by surveying 1-2 m/s; 3 m/s is unverified stretch.
At 2 m/s the section requires 540 m3/h installed. Fan RFQ duty 540 m3/h at a
preliminary 50 Pa allowance; 50 Pa is not a completed system-loss calculation.
Require vendor Q-P curve, dimensions, compatible controller and noise/current.
A maximum free-air flow figure is not proof of the installed duty.

## Model
R01 is a 230 x170 x70 mm clearance BOX (old 9.2/6.8m concept at 1:40), NOT an
aircraft model or airfoil. It is not an STL test article. Update with actual
frozen CAD. Whole-aircraft Re at these speeds is very low; ranking/stall cannot
be transferred directly to full scale. Prefer isolated-wing coupons for
surface visibility, and correlate model-scale CFD before performance claims.
A03/A04 printed clevis files are mockup geometry, not load-rated components.
Manual mount is adjust-and-lock. No freely swinging test. Moving tests need
motion logging, inertial/support corrections and a separate controlled rig.

## Validation
Valid B-rep per component; assembly STEP round trip; DXF parser audits; budget
sum checks. These do not validate panel stiffness, fan duty, turbulence,
measurement uncertainty, electrical protection, print strength or aerodynamics.
Manufacture and operation require resolving the stated holds.

## Thai step-by-step guide update
See guide/START-HERE-TH.txt, guide/material-cards/ and data/material-cut-list-TH.csv. Stock-sheet nesting remains unverified; a second 6mm plywood sheet at the 1,200 THB allowance would leave only 100 THB contingency. Smoke remains optional and outside the starting budget.