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Old 01-21-2011, 08:31 AM   #1
copeab
 
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Join Date: Mar 2005
Location: near Houston
Default [WWII] Polikarpov R-5 recon bomber (USSR)

Okay, pretty sure this one hasn't appeared in a book yet ...
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Polikarpov R-5 light reconnaissance bomber
Copyright 2011 by Brandon Cope

The R-5 was a large, single-engine biplane developed in Russia during the late 1920's as a successor to the P-1. It entered service in 1931 and by the end of the decade some 7,000 of all versions had been built, with 4,900 of the basic R-5. Apart from it's roles in reconnaissance and as a light bomber, during WWII it also served as a trainer, liaison plane and, like the more famous U-2 (Po-2) a night harassment bomber. It saw limited action in the Spanish Civil War (about 30 planes were used by the Republicans), the Far East against Japan, Poland and the Winter War. Like many Soviet aircraft of the period, the wheels were often replaced with skis for operations on snow. Apart from the Soviet Union and Spain, the P-5 was flown by Iran, Mongolia and Turkey (while Finland captured several in the Winter War, they didn't operate them).

The most noteworthy use of the civilian version of the plane (the P-5) was in rescuing the marooned crew of the SS Chelyuskin in 1934, using G-61 containers.

The R-5 has a crew of two: pilot (who also fires the forward machine guns and drops the bombs) and observer (who fires the two rear machine guns). The R-5 uses 26.7 gallons of aviation fuel per hour.

Subassemblies: Medium Fighter chassis +3, Heavy Fighter Wings with* Biplane option +2, three fixed wheels +0
P&P: 533-kW aerial HP gasoline engine w/ 533-kW old prop with 210-gallon tank [Body]; 4000-kWs batteries
Occ: 2 XCS
Cargo: 6 Body

Armor
Body/Wings: 2/2

Weaponry
3xAircraft LMG/7.62mm ShKAS [Body:F,2xB] (500 each)

Equipment
Body: Medium range radio transmitter and receiver, autopilot, navigation instruments, bombsight. Wings: 440-lb hardpoint each

Statistics
Size: 34'x51'x10'
Payload: 1.39 tons
LWt: 3.33 tons
Volume: 200
Maint.: 57 hours
Price: $12,500

HT: 9
HP: 120 [body], 90 [each wing] , 12 [each wheel]

aSpeed: 144
aAccel: 4
aDecel: 20
aMR: 4.75
aSR: 2
Stall: 49 mph. -1 mph per loaded hardpoint.

Design Notes
Design aSpeed was 146 mph. Historical wing surface area was 540 sf. The body and wings use the Wooden Armor option. The cost, weight and HPs of the wings were divided by four to bring down the weight into historical range. reflect their light structure.

Design assumes a full bomb load of eight 110-lb bombs. With clean hardpoints, the following stats change: Lwt. 2.9 tons, payload 0.95 tons, aSpeed 152, aAccel 5, Stall 46, aMR 5.5, aDecel 22.

Variants
R-5's built before 1933 used a 507-kW engine (aSpeed 142) and were armed with a PV-1 in the nose and two DV in the rear gunner position. These were replaced with ShKAS's in the mid 1930's.

The R-5a (1933) was fitted with twin floats for use as a seaplane. About 110 were built.

The R-5Sh (1933) was a ground attack version, with eight more PV-1's added to the top of the lower wing in two groups of four (prototypes used two groups of two). Up to 220 lbs of bombs could be carried under the fuselage, for a total bomb load of 1,100 lbs. It used the 507-kW engine.

The R-5SSS (1935) improved aerodynamics, with about 100 built. A second ShKAS was added to the nose and The landing gear was fitted with streamlined spats. Along with other minor improvements, this increased speed to 167 mph. The civil P-5SSS had the same aerodynamic improvements.

The fifty R-5T had their landing gear redesigned to allow a single torpedo to be carried. The observer/gunner position was deleted.

The P-5 (1931) was the unarmed civil version, primarily used for transporting up to 880 lbs of cargo. Like the R-5, it often replaced the wheels with skids. For the rare passenger transports, the gunner's position was enlarged to take two passengers. Some had their lower wing strengthened to carry the G-61 container, which carried up to eight people laying prone. The Pa-5 was an uncommon variant equipped with twin floats. The P-5L (1933) enclosed the two passenger seats. The RP-5 (1936) expanded the enclosed passenger area to four seats and also enclosed the cockpit and was followed by the improved RP-5bis; over 200 were converted from existing P-5's. A bit over 1,000 of all versions of the P-5 were built.

There were several other variants, most built in very small numbers or as lone prototypes. The most interesting was the ARK-5, of which at least two were built for Arctic operations. Both crew positions were enclosed and heated and cargo was carried in two streamlined fairings blended into the sides of the fuselage and the lower wings.
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Brandon Cope

GURPS 3e stuff: http://copeab.tripod.com
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