SERPENT: Viper 990E 4wd 1/8 EP
The Serpent Viper 990E is the successor of the successful 988E/989E. We have spent a lot of testing and research to improve the former electric powered 1-8 platforms. We put a lot of emphasis on the flex characteristic since that showed very promising results. On top of that we improved weight, weight distribution and ease of maintenance. A lot of the development went into the transmission. The goal was to have a bullet-proved, yet very free transmission
New key features
The ultra-narrow chassis is milled down to allow the lowest possible mounting of the batteries plate as well as improving the overall flex characteristics.
The central part of the chassis features 3 NACA ducts for the cooling of the speedo as well as the motor
The motor has been put as low as possible by machining the chassis underneath it. This improves the centre of gravity as well as the cooling from the bottom.
The rear of the chassis has a slot. This has become a very important feature of the Nitro 990. It has to do with adjustable flex.
It also carries 2 steel countersunk screws that act as a counterpart of the down-stop screws. This helps to keep the down-stop more accurate and consistent
The overall flex is controlled by the “backbone", a very popular feature of the 988E.
The front of the car can be adjusted to more flex by removing the 2 front screws or even the one on top of the servosaver.
The rear of the car is also adjustable regarding the flex. The regular rear end features the proven, one-piece rear plate
As an option it is also possible to use a softer rear end using a optional 2-piece rear plate
The receiver and the steering servo are mounted on a small “radio plate" which can be easily removed for easy access.
The aluminium servo mounts are eccentric and can be mounted in 2 ways to adjust them to the brand of servos.
The rear end is completely new. It features a new design to allow an re-active toe-change as well as avoid any binding at all!
By changing the position of the link the amount of toe-gain under compression can be adjusted. The position shown is the “neutral" position.
Since the upper link is replaced by a suspension arm, we also changed the upper pivot on the upright. It is now super easy to adjust the correct camber.
The height of the pivot ball is adjustable by changing the aluminium insert. There are 3 positions
The upright carries an aluminium insert where the ball bearings of the wheel axle sit. In that way we can achieve the perfect roundness even under load to achieve the least friction of the transmission possible.
In this way it is also really easy to remove the wheel axle/driveshaft for maintenance
The front steering-block features a similar construction.
The aluminium insert gives the same advantages as in the rear with improved drivetrain effectivity and improved ease of maintenance
But because this insert is eccentric, it is also possible to change the roll-centre as well las using a trailing or leading set-up.
Of course the steering-blocks are still left/right symmetrical and can be used with option1 as well as option2 levers.
The front upper suspension bracket now has an improved design takes provides a better placement to avoid camber or caster irregularities by using bushings.
The new transmission is super strong, yet very light and super easy to maintain.
The pulley of the mid-belt is sitting on a steel adapter that is secured by a steel pin.
The spurgear adapter is fixed with 2 of these pins. Changing the spurgear is super easy, just remove 3 screws
General features
7075 T6 Aluminium 5mm chassis plate
The 5mm aluminium chassis has perfect symmetrical shape for even flex and weight distribution. The ultra-narrow chassis is very light, while it still remains strong in critical places.
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