Single-engine piston

N4FW

1975 Homebuilt WSP-1

Registered No accidents on file
Built
1975
Serial
1
Class
Single-engine piston
Engines
Lycoming O-235-C
Status
Current as of October 2026
Registered owner
Individual · sign in to see
Based
Hortonville, WI
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Registration record

N4FW on the FAA register

Type
1975 Homebuilt WSP-1
Serial
1
Engines
Lycoming O-235-C
Registered owner
Individual — the name of an individual registrant is shown to signed-in users. Sign in
Hortonville, WI
Certificate issued
2007-11-07
Airworthiness date
2008-09-22
Registration expires
2028-11-30
Airworthiness class
Experimental · amateur-built
Mode S (hex)
A4A881
Mode S (octal)
51124201
Seats (type)
2
Weight class
up to 12,499 lb
Status
Current as of October 2026
Registry history

Timeline

  • 2028-11-30
    Registration expires (renewal due).
  • 2008-09-22
    Airworthiness date on the current FAA record (experimental category (amateur-built)).
  • 2007-11-07
    Certificate of registration issued as N4FW.
  • 1975
    Manufactured (1975).
Overview

About N4FW

N4FW is a 1975 Homebuilt WSP-1, serial number 1. It is registered to an individual in Hortonville, Wisconsin. The current certificate of registration was issued on November 7, 2007 and expires on November 30, 2028.

The FAA aircraft reference file describes the type as a single-engine piston, one Lycoming O-235-C engine and 2 seats. Its airworthiness certificate is experimental category (amateur-built), dated September 22, 2008.

No NTSB accident or incident reports and no FAA preliminary notices are on file for N4FW.

Safety record

Accident & incident history

✓ No NTSB accident or incident reports and no FAA preliminary notices on file for N4FW.

Sources: NTSB aviation accident database and CAROL case system, FAA preliminary accident & incident notices. Search accident records

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Browse: Aircraft registered in Wisconsin· Registry by state· FAA registry stats

Data: FAA Aircraft Registry (October 2026), including deregistered aircraft; NTSB and FAA accident data; fyiAero listing history. Individual owners' names are shown to signed-in users and street addresses are never shown. Type figures are published specifications, not this aircraft's.