what is it?
The Keystone NK or Keystone Pup was a two-seat biplane trainer built by Keystone Aircraft for the United States Navy.
How to recognise it: 1 engine · 11.3 m wingspan
base stats
Bars compare against all aircraft: 3,500 km/h, 20,000 km, 850 seats; size and number built on a log scale up to 640 t (An-225) and 45,000 built (Cessna 172).
fun facts
- First flew 98 years ago, in 1928.
- Wingspan of 11.3 m: about 3 cars parked nose to tail.
spec sheet
- first flight
- 1928
- introduced
- 1930
- number built
- 20
- role
- biplane trainer
- origin
- 🇺🇸 United States
- makers
- Keystone Aircraft
- engines
- 1× Wright R-790 Whirlwind
- crew
- 2
- length
- 8.1 m
- wingspan
- 11.3 m
- top speed
- 186 km/h
- range
- 603 km
Specs are for the version in the Wikipedia article's specification section. Blank means the sources don't say.
Sources: Wikidata Q6398485, Wikipedia: Keystone NK (CC BY-SA 4.0).Updated 2026-10-24.