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Seversky P-35

The Seversky P-35 was the first all-metal monoplane Pursuit plane with a rotary engine and retractable landing gear operated by the USAAC.  Per reference [8] it took its first flight on 15 August 1935 and entered active service with the US armed forces in 1937.  In addition to the USAAC, 60 export versions of this type of aircraft were sold to Sweden, which were designated EP-106 by Seversky ot J-9 by the Swedish Air Force.  In the lead up to the United State's involvement in WWII the US government eventually banned the sales of additional aircraft overseas to most countries other than the UK, but eventually did transfer six air craft to Ecuador as well as transferring some ex-USAAC aircraft to the Phillipine Airforce as USAAC squadrons in that country transitioned to P-40 type aircraft.  A total of 196 aircraft of this type aircraft were built in addition to a navalized prototype called the NF-1 which competed against the F2A and early F4F designs for a US Navy contract.

The landing gear retracted straight back into faired housings that extended below the wing, and the aircraft also had a "plexiglass: razorback configuration aft the cockpit, as shown below, somewhat similar to the configuration on the Brewster F2A/239/339 design.

As shown in the images below distinguishing features of this aircraft including;
P-35
[Image Sources: US Government/Public Domain via Ref [8] - as annotated by this site]

P35_3-view_A
[Source: Ref [14a] - US Government/Public Domain]

In order to try and better develop weight estimating relationships an effort has been made to estimate the length of the fuselage aft of the firewall, and the length of the engine section forward of the firewall based off scaled drawings.  Together these two distances add to a term called the "structural length" and do not consider any portion of the engine or propeller shaft the extend foward of the fuselage/cowling, or any empennage that extends aft of the fuselage structure.  The drawing below shows the current best estimate of these dimensions obtained from available drawings of the airplane and will be updated with any real world data that becomes available.  For any aircraft with an inclined firewall, an attempt has been made to locate an approximate center of this location.

P35-Dims

The table below summarizes the current data collected on this type aircraft, identifying sources for the data

    P-35 Secondary SourcesNotes
Primary Source
2

No of Crew   1

Engine:  


   Qty   1

   Model   R-1830-9 5
   Displacement  (cu in) 1830 5
   Power  


     Military (HP)


     War Emergency (HP)


    Normal (HP) 850 5
    Take Off (HP) 950 5
   Eng Dims  


     Length (ft) 4.64 5
     Width/Dia (ft) 4 5
     Height (ft)


   Base Engine Wt (lb) 1292 5
Propeller  


   # Blades   3

   Dia (ft)


   Manufacturer  


   Type  


Wing  


   Span (ft) 36

   Root Thickness (%) 18.0%

  (in) 16.4

   Total Area  (sq ft) 220

     Wing (less Ailerons & Flaps) (sq ft)


     Ailerons (sq ft)


     Flaps (sq ft)


Tail Area (sq ft) 54.2 3
   V Tail Area (sq ft) 19.1 3
     Fin (sq ft)


     Rudder (sq ft)


   H Tail Area (sq ft) 35.1 3
     Stabilizer (sq ft)


     Elevator (sq ft)


Total Control Surf Area (sq ft)


Length  


   Overall (ft) 25.3

   Fuselage (ft) 23.2

   Body  (ft) 24.2

     Body Depth (ft)


    Body Width (ft)


Fuel Tank Volume (gal)


   Wing Tanks (gal)


    FuselageTanks (gal)


Oil Tank Volume (gal)


Water Injection Fluid Tank Volume (gal)


Wetted Area (sqf) (sq ft)


Pwr Ldng (lb/HP) 5.89

Wing Ldng (lb/sq ft) 25.45

Struct. Des. GW  (lb)


Ultimate Load Factor (G's)


Design Speed (mph)


Not to Exceed Speed (mph)


     

Total Struct Weight   2043

   Total Wing   785

     Wing    

     Ailerons    

     Flaps    

     Fuselage Carry-Through    

   Tail   125

     H Tail   86

       Stabilizer    

       Elevator    

     V Tail   39

       Fin    

       Rudder    

   Body + Eng Section + LG  


   Body + LG   1133

   Body   669

     Fuselage    

     Engine Section    

   Landing Gear   464

     Mn Landing Gr   399

     Tail/Nose Aux LG   65

   Tail Hook  


   Booms  


   Nacelles  


Total Propulsion Weight   1828

   Engine w/ Accessories   1384

   Engine(s) as Installed   1291

     Accessories   93

    Turbocharger(s)  


   Controls   25

   Propeller(s)   319

     2-Blade    

     3-Blade   319

     4-Blade    

   Starting System   43

   Water Injection System  


     Tanks    

     Piping Etc    

   Cooling System  


   Lube System   32

     Tanks    

     Piping Etc    

   Fuel System   25

     Tanks    

     Piping Etc    

Total Sys. & Eqpmt.   444

   Instruments   45

   Surface Controls    107

   Hydraulics  


   Electrical Equip   173

Electronics (Purple means incl in Furn/Gray in Useful Ld)    

   Arm Prov/Equipment & Armor  


    Furnishings   119

   Anti-Ice (If not in Furn)  


   Other /Misc  


     Hoisting Gear  


     Floatation Gear  


     Armor Plate    

   


Empty Wt   4315

Basic Mission Useful Load   1284

   Crew   200

   Equipment  


   Oil   92

   Fuel   660

   Fuel & Oil Trapped in Systems  


   Water Solution for Engine Injection  


   Bombs/Torp Etc  


   Radio (if Not Included in Empty Wt)  


   Nav Equipment  


   Oxygen System  


   Armament   189

     Guns & Ammo   189

       Guns   96

       Ammo   93

     Pyrotechnics    

     Camera    

     Other    

   Other Useful Load   143

Basic Mission GW   5599


Notes: This website has been developed with a number of low cost or free programs including Hot Metal Pro, KompoZer, MicroSoft Designer and Da Button Factory.com

Rev 3-22-26

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