Rans S-7 Enhancements       12/17/2007    
See below for description of how the S7 has evolved from the early "Short Tail"s through the certified version  volved from the early "Short Tail"s through the certified version and "long tail"    
  to the Current S model  
  Year of Intro: **    1985    1993    1996     1998    1999    2000     2001  S model  
Typical engine       582    912
Typical weight       600     650    670     725   725-750
Gross Weight      1200 1232
Fuselage length   short tail Long tail
Firewall size change     + 2" depth&width
CG range (*firewall datum*)  48 - 55"  ? --------------'      --------- 48 - 53?  ------- ----46 - 50 1/4 ------- 1/4 -----  Curious!
     The above ranges are somewhat imprecise due to arm length revisions. See C G discussion on main page
Landing gear   Cub style single tubeTubular steel     heavier Redesigned axle attach
Axles   5/8" 3/4" 1 1/2"/1 1/4 bolt on
brakes   Mechanical Hydraulic Hegar Hyd-Cleveland Grove/Matco
front toe brakes   No, beside yes  
Rear toe brakes   No   yes
Enlarged tail and fin   No yes
balanced elevators (A Must have) No yes Can also be retrofitted to late 94 and after
Balanced rudder   No yes
Trim tab size   small  full span  
Trim tab actuator   top of stick wheel lever left side     Electric  
Rear seat trim   no yes no
Flaired out doors   No   yes
Flap retraction   1 spring 2 spring Teleflex to handle/no spring
Flap positions   3 2
Aileron actuator   Teleflex Cable
Aileron Bell Crank   formed plate/ compression tube mount Machined/ beside comp tube
Leading edge sheet metal Epoxy bonded to spar Wrapped around LE and rivetted   in 2002 to 2005? Bonded after that
Elevator push/pull tube small larger massive (1 3/4"), 2 piece, + aft pivot
Door latch system   1 ctr + 1 frt 2 point 3 point all connected
Throttle, door handle material Welded tube machined aluminum
Cross tube aft frt seat  yes no
Lifting handles   rear fuselage ? In Stab
Tail spring attach   Two bolt 1 forward+2 in pillow block clamp
Fuel tanks   7.5 x 2 fiberglass 9 x2 plastic
Fuel Lines   Plastic + Ys aft of rear seat mostly metal lines
  some fwd routing /Y
Plastic cabin closure at baggage bulkhead yes    
Lift Strut cross section round Streamline
Rear lift strut size   small large  
Jury strut brace   no option?   Pre-welded
Rad placement   under pilot Further back if 582 under pilot in cowl & smaller!
Coolant lines thru firewall above muffler below muffler No coolant aft of firewall
Oil cooler size/place   Horiz above Left inlet larger
Muffler pipe design   slip joint 4 ball joint 8 ball joint + too short pipe Muffler under engine 4 ball joint
Muffler support   to motor mount above below Pipes only
Motor mount type   Bed (6 rubbers under engine) bed/ 6 rubbers   focalized 4 large rubbers 
  aft of engine like Lcoming
  Other S model enhancements: *Important for 100 hp
Larger Spinner
Down Sized Ailerons with Pressed Ribs
Larger Flaps with Pressed Ribs (Sealed against Fuselage)
Carb heat
Aluminum Fuel lines with aft and forward door post routing
Fuel Venting to outboard lower drain
Electric fuel pump
Roof lexan supported by middle rib
Fiberglass boot cowl
Fiberglass wing tips
**  Individual builders may have added updates to older kits.
 The following is off Rans site:
The S-7S was based on the S-7C (S-7 Certified) due to builders
requests. For FAA certification reasons the S-7C had to have an
electric fuel pump. This same system was used on the S-7S (kit
version of the certified) when it was placed in production. 
There are many differences on the S-7S when compared to earlier S-7
models. See above.
Maybe this is a better way to describe the evolution:
The certified version developed in 1998 included many structural and system changes in the wings, fuselage,   
engine mounting, control and fuel systems.   Many of the changes were encorporated into the current kits at   
the time (but not the deeper, wider firewall design, boot cowl, engine mount and other changes ahead of the firewall).
In 2000 the fuselage was lengthend by 22" aft of the battery station which demanded certain control system changes.
Also at this time the datum for  CG calculations was changed from the prop hub to the firewall and arm numbers were revised for pilot, 
  passenger and baggage.    
In 2002 Rans included the rest of those changes developed for the C version into the current kits and called it   
the S7S. These enhancements were the bigger firewall, fiberglass boot cowl and wing tips, focalized     
engine mount and the other engine and fuel system changes.    
and the deeper firewall translates  to a lower position for the pilot's feet.  
* Also important is the fact that the focalized mount moves the engine forward by about 2 1/2 inches    
**   Date of manufacture is part of serial number:   MMYYXXX
Clearly you have to know the year of the kit and details on any updates before you can get an understanding of what 
features are in the plane.