Michael Salven as chief designer, developed new v2 gear diffs for the Natrix, being a slightly different front and rear one, with new case, gears and sealing system, which make it really easy to assemble and maintain. The 748 EVO has the new lower big bore shocks included, as well as new larger pullies and a new side belt.
Another feature is the light 2-speed gearbox the XLi ( eXtra Low Inertia) with small adaptor, bell and shoes.
Extra WC options added:
- 803240 CVD-set Pro (2) ( to use in the rear)
- 804273 Chassis weight 25gr 747
- 804296 Body support rear (2)
- 804360 Throttle lever alu
- 804363 Steering block lever carbon 748 (2)
Serpent 748-WC; details
Symmetrical chassis plate for even flex and torsion, in 7075 T6 aluminum, anodized and laser engraved. Chamfered edges for more ground clearance when cornering and countersunk holes. Central slots to mount weight, which can slide into the right position and then secured.
The 2mm carbon fiber radio plate has multiple functions. It holds the fuel tank in place which is mounted on 3 alu posts in rubber. On the right hand side the receiver mounts to a nicely shaped carbon fiber plate that connects to the radio tray, squeezed in right between belt and tank. The radio plate sits again lower on the car , for lower center of gravity.
Central Flex system
The rear section of the radio plate incorporates a nice flex-control system. It consists of 2 machined aluminum parts. The lower one connects to the radio plate supports an the upper one with screws to the upper alu plate and radio plate. You can either run the 748 rigid with flex . The optional ball-bearings and screws are sold separate. Testing has shown that flex in the center rear of the car has the most effect and reacts most predictable as well.
748 servo holder
A new composite servo holder is designed to have both servo closer to the center line of the car and as low as possible. The 2 lay-down servo’s are seated very close together and mount in a very efficient and easy way. The holder mounts to the radio-tray.
The throttle / brake linkage is same style as used on the 977 1/8 car. A pivot-lever system with an ingenious ball-cup system to the guide the wire and have almost friction free action.
748 receiver box
The new composite receiver box is small but holds and protects the most common modern receivers easily. The antenna mounts to the top. The box is securely fastened to the radio plate with a nylon bracket . The box has been moved as much to the inside as possible. On the radio plate a small holder is fitted to accept the plugs of the battery, to act as on/off “switch”.
Carbon fiber battery-holder positioned between the tank and pipe, for the best weight balance. The battery is easy to strap down with tape to the bracket. Spacers can be used to mount the battery higher or lower depending on the battery you plan to use.
748 fuel tank
Lower and longer durable 75ccm nylon fuel tank with transparent material to easy see fuel-content. Large spring-loaded quick-fill cap with seal with large tank opening for fast and easy refills. The bronze sintered filter will keep fuel clean and make sure tank will empty till last drop if needed. Fuel tank sits very low in the car for low center of gravity. Fuel tank is mounted with clips on 3 alu posts with rubber buffers.
Low big bore shocks
Coated threaded shock bodies in high quality aluminum. Super smooth x-ring / machined bushing package, to guide and seal the spring-steel piston rods. Precision machined pistons included in 3 types. Threaded pre-load shock nuts in alu with o-ring inside. Light but strong nylon spring-cups. Selected, matched and paired shock absorber springs with color coding.
Front bumper and body mount
Front bumper with aerodynamic effects and excellent protection. Some parts of the lower bumper can be cut open to create more steering. Medium or small foam bumper pad scan still be fitted as optional. The upper carbon fiber body plate mounts to the front bumper with alu post and secures the front body posts
Shock tower front
Super low 3.0mm carbon fiber shock towers with 3 positions for upper shock mounting. In the center you can mount the 3rd body post as needed.
A compact and superlight structure of top-quality aluminum parts consist of top-brackets, L and R equal bearing brackets, lower suspension bracket front. The open style design allows for very fast parts exchange as needed, like belt, diff or anti-roll bar.
Strong long double A-arm suspension with aluminum pivot balls, which pivot in light nylon cups. Hard type composite arms. The arms pivot on the inside on spring steel pins. The pivot-inserts are used to change roll center. Small grub screws mount in the upper bracket to control down stop. Easy to access and change ride height, front width, toe-in, caster and camber.
Very strong composite steering blocks with 2 Ackermann positions, L and R use the same . The steering blocks feature inserts, which allow to change the kingpin inclination to a leading or trailing position. The steering blocks also allow use of the optional carbon fiber aero disks to be mounted for less flex and a more direct steering feel.
Wheel axles / cvd
The spring-steel wheel axles are seated in high speed bearings. The light and durable spring-steel cvd’s bring all the power to the front wheels. Wheels are mounted to orange anodized high grade aluminum hex-adaptors using flanged wheel nuts.
Anti-roll bar front
The balanced wire type anti-roll bar in the front is really easy to access and change for other type or thickness as needed. The anti-roll bar is linked to the lower a-arms with a unique pivot ball/cup system, which provides direct and smooth operation and is easy to set and adjust.
Servo-saver / steering
The new lowered centrally mounted steel servo-saver post fits the spring-loaded balanced servo-saver system and steering. The inserts allow 2 ackermann settings. Due to the open design the linkages with L/R threading can be reached easily. The whole system allows for very precise steering and minimum bump steer.
Middle shaft holder
Machined 2 piece aluminum middle shaft holder, which securely holds the spring steel middle shaft, and doubles up as holder of the pipe-mount.
Very rigid but open rear end design with a composition of machined alu brackets, allowing for easy maintenance. The differential brackets, L and R equal, are toothed and seat the eccentric bearing holder, which allow for setting belt tension. It’s very quick and easy to mount a differential and or replace a belt. The machined aluminum lower suspension brackets have roll-center inserts with 3 positions to choose from. The rear bracket is the narrow V1 version.
The 2-speed gearbox shaft holders, double up as anti-roll mounts, and brake system basis. All top-quality machined parts with anodizing and laser-engraving.
the low mounted brake system with superlight disk allows for smooth and even braking, and the open system avoids overheating. The ball-raced excenter and lever gives a very smooth and direct brake-feeling.
Rear carbon shock tower and camber bracket
The low 3.0mm carbon shock tower has 3 upper mounting position for the shocks and it mounts the body-posts. The camber bracket offers 8 positions to choose from, 4 inner and 4 out holes. The shock tower is prepared to mount the extra body-protectors, which are optional.
The Hard lower rear composite arms together with the updated uprights create a wider set-up sweet-spot with more grip and more steering. The upper camber rods connect to the carbon camber bracket with 8 mounting positions for roll-center and the camber rod is easy to access and has L/R threading for fast changes. The aluminum pivot ball system allows for fast changes in width and toe-in. On the lower inside the wishbone pivots on spring steel pins, which seat with roll-center inserts in the anodized alu suspension brackets.
Lower rear wishbones
The hard composite lower wishbones feature a mounting position for the anti-roll bar linkage which moves the link position more outside. It’s also offers a mounting position for an optional carbon shock-mount bracket, to move the lower shock mount position further out, but for the default set-up it’s not needed. By placing the lower shock further out, you will get even more steering .
Uprights / wheel-axles
Durable medium type composite uprights, which seat the wheel-axles bearings. The upright offers the mounting position for the steel camber-rod with L/R threading. Roll center changes can be made on top of the upright with shims. The upright can be mounted with the optional carbon fiber aero disks for more rear grip and straight line stability.
Wheel axles and driveshaft
The durable spring steel wheel axles combined with spring steel driveshafts bring the power from the gear-diff to the wheels. Wheels are fitted on high grade anodized alu wheel hex adaptors and secured with flanged.
Anti-roll bar rear
The balanced wire type anti-roll bar in the rear is really easy to access from the top and change for other type or thickness as needed. The anti-roll bar is linked to the lower a-arms with a spring-steel rod.
Compact, durable and lighter gear differential. Precision molded steel gears, 2 small 14T and 2 large 28T ones. The very durable and light spring steel lightened diff-adaptors connect to the driveshafts. Front and rear gear differential share the same internal parts.
Spring steel, light and very durable CVD’s used in the front. Precision mounted hard steel pins
Spring steel, light and very durable dogbones used in the rear. Precision mounted hard steel pins
Precision molded super-true pullies, which feature holed sidewalls to let debris move out easier. Light and durable.
Low friction Kevlar reinforced belts with fine pitch. Long-lasting and smooth.
Ball raced belt-tensioner, machined from aluminum and can mount on top or below the radio plate.
Gear-box SL6 – Xli
The well proven SL6 gearbox has been redesigned and lighter. Smaller bell, adaptor and shoes reduce overall weight and rotating mass, so lower inertia. Durable and long-lasting gears. High quality bearings. Very grippy smaller spring-loaded-speed shoes, easy to set.
True Motion Centax clutch
Serpent invented the Centax clutch in the mid 90-ties, and all brands followed it. Small improvements are found to make the original system even better. The True Motion Centax has a flat flywheel, and the taper part on the pressure plate. This allows the flyweights to work even better. The hard anodized aluminum flywheel has 4 holes to have easy access to keep the flywheel in position when setting the pre-tension. The flyweights are made of top-quality teflon and feature an additional hole to use grub screws to make them heavier. The red friction clutch shoe is very grippy, and works excellent with the steel clutch housing. The hard anodized gears screw onto the threaded steel bell.
The light machined and anodized engine mounts perfectly seats the engine, well aligned with the gearbox. Small adjustment can be made to move the engine closer to the gearbox.
Manual / set-up sheet
The 748 comes with a full color assembly manual, with easy to follow assembly steps. The manual also includes exploded views section showing all part numbers, and a full parts-list, showing also all optional. The kit includes a default and blank set-up sheet. Editable sheets are in the Serpent website.
The 748 includes one sheet with Serpent generic logo’s and one with 748 logo’s. Decals are very thin material and come pre-cut.
The 748 comes in a strong, small carton box with nice graphics. The packing of the bags follows the steps in the manual.
Designed by World and European Champion Michael Salven