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Rotec R3600 Powered Avro 504K
Status: 1st of its kind to fly with a Rotec R3600
Owner: Gerald Yagen
Builder: Pur Sang Aero Historic (Argentina)
First Flight: Feb. 2010

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Gerald Yagen's Avro 504K Project

Jerry is the owner of the Aviation Institute of Maintenance being FAA approved schools, operating in Georgia, Indiana, Missouri, Pennsylvania, Texas, Orlando and Virginia.

Each of the seven schools are currently constructing different WW1 replicas (see: However as none of the schools selected the AVRO 504, Jerry made it his own personal project. He commissioned Pur Sang Aero Historic (Argentina) to construct the first 504 which proved to be a great success; consequently, Jerry commissioned a second AVRO 504. The first aircraft is now operational in the USA.

Jerry is also the owner of a Military Aviation Museum located at Virginea Beach VA. The Avro LV-X373 is now located at this museum. For more information Link To:

Historical Summary on the AVRO 504K:

A two-seat training aircraft. The 504K had a universal mount to take different engines. Single-seat fighter conversion used for anti-zeppelin work. Several were assembled in Australia by Australian Aircraft & Engineering. 130 hp (100 kW) Clerget, 100 hp (75 kW) Gnome or 110 hp (80 kW) Le Rhône engines. Jerry elected to use Rotec's R3600 for his Avro 504's

Original Specs At a Glance:

General characteristics
Crew: 2
Maximum speed: 90 mph (145 km/h)
Length: 29 ft 5 in (8.97 m)
Cruise speed: 75 mph (126 km/h)
Wingspan: 36 ft (10.97 m)
Range: 250 mi (402 km)
Height: 10 ft 5 in (3.17 m)
Service ceiling: 16,000 ft (4,875 m)
Wing area: 330 ft² (30.7 m²)
Rate of climb: 700 ft/min (3.6 m/s)
Empty weight: 1,231 lb (558 kg)
Wing loading: 5.54 lb/ft² (18.2 kg/m²)
Max takeoff weight: 1,829 lb (830 kg)
Power/mass: 0.06 hp/lb (0.099 kW/kg)
Powerplant: 1× Le Rhône Rotary, 110 hp (82 kW)
Climb to 3,500 ft (1,065 m) in 5 min

Jerry's Avro 504 LV-X373 Specs At a Glance:

General characteristics Performance
Crew: 2 
Maximum speed: 100 mph (161 km/h) 
Length: 29 ft 5 in (8.97 m) 
Cruise Speed: 70 mph (112.6 km/h) 
Wingspan: 36 ft (10.97 m) 
Range:  to be advised
Height: 10 ft 5 in (3.17 m) 
Service ceiling: 12,000 ft (3.657 m) 
Wing area: 330 ft² (30.7 m²) 
Rate of climb: 500 ft/min (2.54 m/s) 
Empty weight: 1.357 lb (615 kg) 
Wing loading (MTOW): 5.56 lb/ft² (27.22 kg/m²) 
Max takeoff weight: 1.934 lb (878 kg) (Heavy pilot and passenger) 
Powerplant: 1 Rotec 3600 Radial Engine, 150 hp 

News on the second Avro being that its about to undergo flight testing.

Latest Updates are at the top.

Do you want to start at the beginning of the project? In which case Click to Go Down to the start...

as usual click to on the bordered thumb-nails to enlarge ..

Operational Checklist:


Mags -OFF
Master – ON
Oil Sump switch – ON till empty
Master – OFF
Oil quantity- check (#1)

Approx 25 gallons fuel. (2#)

Gascolator fuel drains – clear
Remove 3 thumb screw drains (#3)
Pull prop through 6 blades (4#)


Fuel and Oil Levers – ON
Choke Lever – Full Forward
3 shots of prime
Throttle – cracked ¼”
Fuel Pump – ON
Start Button - PUSH.
4 blades and turn mags on.
Choke – OFF after about 3 seconds Engine Idle for warm up
Fuel Pump – OFF (#5)


Oil Sump – ON for long taxi


Oil Sump – OFF
Full throttle - (3600rpm) 

3000-3200 RPM

70mph approach*

Mags, fuel, Oil – OFF
OIL Sump – ON (Off when empty)
Master Switch - OFF
Tail dolly for ground handling. (8#)


(1#) Forward cap on top of cowling. Remove scavenge hose then unscrew cap with attached dipstick. Oil sump must be scavenged before checking oil tank quantity. Aeroshell 15-50 is used in this engine.

(2#) Approx 25 gallons fuel. Fuel Stick gage inop. Confirm fuel by looking in the tank or top it off (best).

(3#) There are 3 cylinder intake drains on the lower cylinders. These thumbscrews must be removed prior to all flights when acft has sat for any length of time. (Approx 30 minutes or more). Engine is very susceptible to hydraulic lock.

(#4) Turn prop thru. Lock is solid, not compression resistance. If yes; Helps to gently turn prop backwards until all oil stops draining from exhaust stacks and prop can rotate freely.

(4#) Main fuel cutoff old type and a pull out ensures better seal. Mixture , “Benzine Auf”, full forward.  Lever is lose; bungee to hold.

(5#) Fuel pump is used for engine start and emergency only. If you take off and find you forgot to turn the electric pump off, Leave it in the ON position. Engine will quit if you turn it off.

(6#) Tail-dolly for ground handling.

Monday, 25 October 2010 Form Jerry:

At Museum
Fly By at Show
Magnificent Air to Air Pic
Being Photographed

... and even more flying this time with video and sound!

... lets do some more flying!

February 2010: Flight testing with touch 'n go ..

Completed aircraft at engine ground testing stage ...

During the lead time and arranging the delivery of the engine the Pur Sang Aero team work on the aircraft and prepare it for the arrival of the R3600.. Once the Rotec arrives the engine is quickly mounted and they move rapidly to flight...


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