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Jurca MJ-100 Baby Spitfire

 

jurcamj1001


Jurca Plans will provide a full size MJ-100 Spitfire replica set of plans and power plant required is some V-12 of 1700 hp.
The MJ-100R version has 4130 tube fuselage covered with aluminium or composite skins.

 

jurcamj1002

 

Bob Deford, EAA 314241, of Prescott, Arizona, built a full-scale replica Spitfire Mk IX of wooden construction, powered by an Allison V-1710 engine turning a DC-3 propeller. He and a friend went to work on the plane in 1996 and spent eight years to finish it. N1940K was completed in 2003.
 
N1940K
 
French engineering studies yielded a welded steel tube fuselage structure that could support an Allison V-1710 engine capable of generating 1,400 hp on takeoff. The steel tube internal fuselage structure is covered with a non-load-bearing aluminum skin riveted in place. The wing spar is made of laminated Douglas fir planks hosting wooden ribs. The whole skeletal structure of the wing is sheathed in 3/16-inch aircraft plywood.
 
The unattached skins are soaked from both sides, and then placed flat in the sun just long enough to dry the surfaces while keeping the interior moist. The inside surface of the sheet next received a rolled-on coat of epoxy before being aligned on the wing and hit with a staple gun. The plywood drys, conforming to the airfoil shape of the wing. Fiberglass topped with epoxy finishs the job, giving the wing protection and smoothness.
 
 
 
The main landing gear uses T-6 Texan hydraulics and T-28 wheels and brakes support tires normally found on a business twin. The main gear struts are newly made. Instead of using oleos for shock absorption, Deford worked with a spring vendor to come up with heavy springs that cushion the load of landing without the complexity of oil shocks, giving the gear no maintenance. He said the result is a ground ride that "hops like a real Spitfire," based on his review of Spitfire ground handling films.
 
The Allison engine is from a P-39 Airacobra and Hamilton Standard propeller from a DC-3.
 
Jurc-Spit-01
 
The Allison uses a downdraft carburetor with a duct running from the traditional Spitfire chin scoop back to the firewall and up to the top of the cowled Allison.
 
His has an original-type stick that pivots at mid-stick for roll, and says it could not work otherwise because the Jurca cockpit is a bit more narrow than the original due to straight tubing in the cockpit area. The original cockpit bows outward a bit from the canopy opening so, if the entire stick pivoted for roll at the floor, he would have very little roll control throw availble.
 
Jurc-Spit-02
 
 

MJ-100 (100%)
Speed max: 355 mph.
Cruise: 300 mph.
Range: 500 sm.
Stall: 62 mph.
ROC: 3500 fpm.
Take-off dist: 1000 ft.
Landing dist: 2000 ft.
Service ceiling: 25,000 ft.
Engine: Allison V-12, 1100 hp.
HP range: 400-1200.
Fuel cap: 150 USG.
Weight empty: 3900 lbs.
Gross: 5060 lbs.
Length: 29.92 ft.
Wing span: 36 ft.
Wing area: 242 sq.ft.
Seats: 1.
Landing gear: retractable tail wheel.

 
Engine: Allison V-12, 1100 hp
Wing span: 10.97 m
Wing area: 22.26 sq.m
MAUW: 2295 kg
Empty weight: 1770 kg
Fuel capacity: 568 lt
Max speed: 571 kph
Cruise speed: 483 kph
Minimum speed: 100 kph
Climb rate: 17 m/s
Seats: 1
Plan price (1998): US$3750
 

 

Deford N1940K
 
Engine: Allison V-1710
Prop: 3-blade, ex-DC-3
 
Wingspan: 36 ft 10 in
 
Top speed: 300 mph
Fuel capacity: 100 USG
ROC: 3500 - 4000 fpm
Load factor: +9 g / -6 g
Endurance: 1 hr 30 min
 
 
 

 

 

 

 

 

 

 


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