Dataplate Aircraft Records · AD Engine
IN PROGRESS EXPERIMENTAL · AMATEUR-BUILT PLANS-BUILT · COMPOSITE

Nat Puffer Cozy Mk IV

Plans set #2174 · Lycoming O-360 (pusher) · MT-Propeller 3-blade composite
Registration PENDING · reservation N4CZ (pending FAA)
Build totals
Hours on build1 842.0 / ~2 800.0 est
A&P credit hrs908.0 (supervised)
Entries312 · 84 signed
Photos2284
§ 01 — Phase plan

Progress at a glance

COZY MK IV PLANS, REV 18 · UPDATED 2024-08-03
100%
Shop & epoxy discipline
72.0 h
100%
Bulkheads (ch. 5-7)
184.0 h
100%
Fuselage sides
206.0 h
100%
Fuselage bottom
148.0 h
100%
Canard
194.0 h
100%
Main wings
312.0 h
100%
Winglets
88.0 h
100%
Control system
142.0 h
100%
Canopy & strakes
164.0 h
58%
Surface prep & micro
248.0 / ~420.0
0%
Paint
0.0 / ~140.0
20%
Engine install (pusher)
52.0 / ~180.0
16%
Avionics
32.0 / ~160.0
0%
First flight prep
0.0 / ~90.0

§ 02 — Build journal

Latest entries

2026-04-19 · SAT · 5.5 h logged

Second micro coat — canard upper surface to 120-grit

SURFACE PREP A&P CREDIT · 5.5h PHOTOS · 8
Mixed West System 105/205 with Q-Cell to peanut-butter consistency, troweled thin across the canard upper. Waited the full cure window, then block-sanded with 80 → 120-grit. Two pinholes showing near the inboard leading edge; marked for micro spot-fill tomorrow. Goodrich signed the epoxy mix ratio and the ambient temp/humidity log for this layup session.
CZ_0419_mix.jpg
105/205 + Q-Cell
CZ_0419_canard.jpg
troweled
CZ_0419_sanded.jpg
to 120
Supervising A&P signoff
R. Goodrich
Goodrich, Ruth · A&P/IA 3011482
sha256:f217 c0bb 9e08
anchored: OTS 2026-04-19
2026-04-13 · MON · 4.0 h logged

Block-sanded main wing lower — found two low spots

SURFACE PREP A&P CREDIT · 4.0h PHOTOS · 6
Ran 48" sanding bar on wing lower surface — 80-grit with contour-blocks. Bar picked up a ~0.060" low spot near station 144 and a second about a foot inboard. Marked, taped, will spot-micro next session. Rest of surface reading flat. Composite surface prep is where the sequence of passes matters more than any single session's output.
Supervising A&P signoff
M. Taufik
Taufik, Muhammad · A&P 2987441
sha256:81a3 24e6 c190
anchored: OTS 2026-04-13
2026-04-07 · TUE · 2.0 h logged · DRAFT

Mounted engine — dry fit on pusher mount

ENGINE INSTALL DRAFT — not yet signed

Test-fit the O-360 on the composite engine mount shelf; trial-torqued the four dynafocal bolts to snug (not final). Need to recheck cowling clearances once the final prop spinner template arrives. Draft — will sign after final torque and the 8130-3 review with Goodrich.