The Serpent Viper 990th is the successor of the successful 989. We have spent a lot of testing and research to improve the 989 platform. 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. Beside all these brandnew features we kept 90% of our proven transmission and our excellent shock absorbers.
New key features
The ultra-narrow chassis is milled down to allow the lower radio plate as well as improved flex. keeps the improved flex characteristics. The central hole underneath the tank is narrower, as a consequence of the narrower chassis.
The central weight bridge is now mounted from underneath and allows for a quick change of the weight.
The weight itself is now fixed using a nylock nut. Bulletproof!
The front weight bridge is now also mounted from the bottom to allow easy access to the weight.
Also the front weight is now adjustable from the bottom.
There are 2 additional locations to put a small weight, just behind the servo-saver and in front of the engine.
The engine has been lowered 1mm for improved flex as well to lower the CG
The rear of the chassis has a slot. This will be explained later here. 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
Talking about flex: we tested a lot and one of the improvements came from lowering the radio plate by 2.5mm. We also change the shape of it.
The front of the car can be adjusted to more flex by removing the front stiffener bracket.
An even softer option would be to remove the 2 front screws.
The rear of the car is also adjustable regarding the flex. To 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 radio-box is completely new. The “backbone” of it is a carbon plate and an aluminium frame.
The aluminium servo mounts are eccentric and can be mounted in 2 ways to adjust them to the brand of servos.