Grumman G-21 Goose

G-21C

Conversion by McKinnon Enterprises, re-engined with four 340 hp (254 kW) [Vous devez être inscrit et connecté pour voir ce lien] air-cooled, geared, and supercharged [Vous devez être inscrit et connecté pour voir ce lien] engines and fitted with retractable wing-tip floats, a fiberglass “radar” nose, a one-piece “wrap-around” windshield, and “picture” (enlarged) cabin windows.

Gross weight increased to 12,499 lb (5,669 kh) as result of internal structural reinforcements.

Two converted as piston-powered models G-21C (serial nos. 1201 and 1202) in 1958-1959.

Two other airframes subsequently converted in 1968, but with two 550 shp (579 eshp, 432 kW) [Vous devez être inscrit et connecté pour voir ce lien]A-20 [Vous devez être inscrit et connecté pour voir ce lien] per STC SA1320WE as G-21C “Hybrids” (serial nos. 1203 and 1204.)

The two G-21C “Hybrids” were actually identical to the later 10,500 lb model G-21E, but they were never certified as such.


G-21D

One G-21C further converted by McKinnon with extended bow section marked by two extra windows on each side and accommodating another four passengers (serial no. changed from 1201 to 1251 in conjunction with re-certification as model G-21D in June 1960.)
In 1966, it was re-engined with two 550 shp (579 eshp, 432 kW) [Vous devez être inscrit et connecté pour voir ce lien]A-20 [Vous devez être inscrit et connecté pour voir ce lien] and fitted with revised Alvarez-Calderon electric flaps in accordance with STC SA1320WE, retaining the G-21D designation but subsequently identified as a McKinnon “Turboprop Goose.”

G-21E

Fully-certified new model based on simplified turbine conversion of McKinnon model G-21C, with 550 shp PT6A-20 engines (680 shp PT6A-27 engines optional) and more fuel, but without all of the structural reinforcements of the 12,499 lb model G-21C. 10,500 lb (4,763 kg) gross weight. One converted (serial no. 1211.)


G-21F

Conversion by Fish & Wildlife Service in Alaska (using McKinnon engineering data) with 715 shp (533 kW) [Vous devez être inscrit et connecté pour voir ce lien]-2UA-203D turboprops.

One converted but the FWS model “G-21F” was never approved by the FAA and the one example that was built was inexplicably re-certified as a supposedly modified McKinnon G-21G in spite of the fact that it was not built by McKinnon nor ever conformed to the model G-21G type design.

G-21G

Final McKinnon conversion also fully certified as a new model with 680 shp (507 kW) PT6A-27 engines, 586 US gal. of fuel, and 12,500 lb gross weight.

Two converted (serial nos. 1205 and 1226.)

XJ3F-1

Prototype eight seat utility amphibian for US Navy. One built 1938

JRF-1

Production version of XJ3F-1. Five built for US Navy.