Note:
Gipsy Queen I
(1936) 205 hp (153 kW), military version of Gipsy Six II.
Splined crankshaft, but intended for fix-pitch airscrews fitted with an adapter.
No fittings for a VP airscrew fitted.
Very limited production.

Gipsy Queen II
(1936) 210 hp (160 kW), military version of the Gipsy Six Series II.
Strengthened crankcase.
Splined crankshaft for V/P airscrew.

Gipsy Queen III
(1940) 200 hp (150 kW), military version of Gipsy Six, strengthened crankcase, tapered crankshaft for fixed-pitch;-1,358 built.
Most of these engines were fitted with a very basic top-cover, as per the early Gipsy-Six, with no accessory drives at the rear of the top-cover whatsoever.

Gipsy Queen IV
(1941) Supercharged version, originally designated Gipsy Queen IIIS, designated Gipsy Queen 50 in June 1944.
Only a handful were made.
This engine was widely advertised at the time, however, it never entered production, as it was superseded by the completely re-engineered Queen 30.

 
Gipsy Queen 30;  All-new engine from this point. (
120 mm x 150 mm = 10.18 L)
(1946) 240 hp (180 kW), 1,762 built.

Gipsy Queen 30-2
(1946) 240 hp (180 kW).

Gipsy Queen 30-3
(1946) 240 hp (180 kW).

Gipsy Queen 30-4
(1946) 240 hp (180 kW).

Gipsy Queen 32
(1946) 250 hp (190 kW).

Gipsy Queen 33
As Gipsy Queen 30 for pusher installation.

Gipsy Queen 34
As Gipsy Queen 30.

Gipsy Queen 50
(1944) 295 hp (220 kW), Single-speed, single stage supercharger.
14 built.

Gipsy Queen 51
295 hp (220 kW), as Gipsy Queen 50.

Gipsy Queen 70-1
(1946) Renamed Gipsy Six S.G, 1,889 built.
Supercharged with reduction-drive.

Gipsy Queen 70-2
380 hp (280 kW)3.
 Supercharged with reduction-drive.

Gipsy Queen 70-3
380 hp (280 kW).
 Supercharged with reduction-drive.

Gipsy Queen 70-4
340 hp (250 kW).
 Supercharged with reduction-drive.

Gipsy Queen 71
(1950) 330 hp (250 kW).
 Supercharged with reduction-drive.

Gipsy Queen 136
UK Ministry of Defence designation of Gipsy Queen 30-2
Note:
Gipsy Queen I
(1936) 205 hp (153 kW), military version of Gipsy Six II. Splined crankshaft, but intended for fix-pitch airscrews fitted with an adapter. No fittings for a VP airscrew fitted. Very limited production.
Gipsy Queen II
(1936) 210 hp (160 kW), military version of the Gipsy Six Series II. Strengthened crankcase. Splined crankshaft for V/P airscrew.
Gipsy Queen III
(1940) 200 hp (150 kW), military version of Gipsy Six, strengthened crankcase, tapered crankshaft for fixed-pitch;-1,358 built. Most of these engines were fitted with a very basic top-cover, as per the early Gipsy-Six, with no accessory drives at the rear of the top-cover whatsoever.
Gipsy Queen IV
(1941) Supercharged version, originally designated Gipsy Queen IIIS, designated Gipsy Queen 50 in June 1944. Only a handful were made. This engine was widely advertised at the time, however, it never entered production, as it was superseded by the completely re-engineered Queen 30.
 
Gipsy Queen 30;  All-new engine from this point. (120 mm x 150 mm = 10.18 L)
(1946) 240 hp (180 kW), 1,762 built.
Gipsy Queen 30-2
(1946) 240 hp (180 kW).
Gipsy Queen 30-3
(1946) 240 hp (180 kW).
Gipsy Queen 30-4
(1946) 240 hp (180 kW).
Gipsy Queen 32
(1946) 250 hp (190 kW).
Gipsy Queen 33
As Gipsy Queen 30 for pusher installation.
Gipsy Queen 34
As Gipsy Queen 30.
Gipsy Queen 50
(1944) 295 hp (220 kW), Single-speed, single stage supercharger. 14 built.
Gipsy Queen 51
295 hp (220 kW), as Gipsy Queen 50.
Gipsy Queen 70-1
(1946) Renamed Gipsy Six S.G, 1,889 built. Supercharged with reduction-drive.
Gipsy Queen 70-2
380 hp (280 kW)3.  Supercharged with reduction-drive.
Gipsy Queen 70-3
380 hp (280 kW).  Supercharged with reduction-drive.
Gipsy Queen 70-4
340 hp (250 kW).  Supercharged with reduction-drive.
Gipsy Queen 71
(1950) 330 hp (250 kW).  Supercharged with reduction-drive.
Gipsy Queen 136
UK Ministry of Defence designation of Gipsy Queen 30-2
De Havilland Gipsy Queen