We are now into our second generation binding adapter plate. If you are using an NNN binding that mounts to an adapter plate, the V2 plate can substantiallyl lower the center of gravity of the binding compared to existing adapter plates making the skis more stable. The V2 binding adapter addresses other roller-ski issues as well. It is the opinion of many skiers that the older, lower center of gravity NNN Xcelerator bindings, are better for roller skis than the much thicker higher center of gravity NNN Quick Lock bindings.
HISTORY OF THE BA400 BINDING ADAPTER
When we first began the development of the binding adapter we performed numerous tests on an existing two-piece binding adapter. We discovered that with the binding adapter mounted to the roller ski the shafts became much stiffer, and vibration dampening was decreased. Basic laws of physics told us this would happen, but the magnitude was greater than expected. The material used in this adapter is very stiff for a plastic and the fact that the part in the molded condition is convex makes it even stiffer when screwed to the top of the shaft. The stiffness of a beam is a cube function of thickness. That’s why plywood 1 inch thick is eight (8) times stiffer than plywood 0.5 inch thick. So increasing the thickness of a beam by a very small amount can dramatically alter the deflection characteristics of the beam. Because the XLQ hybrid shafts have a lower modulus than the aluminum shaft XLA, the binding adapter we tested had a greater negative effect on the ski characteristics of the XLQ than on the aluminum XLA skis. The thickness of the XLQ and XLA skis is 23mm. The thickness of the stiff binding adapter is 5.6mm. So when the two adapter units are securely fastened to the shaft, about 70% of the shaft length is now 28.6mm thick. 28.6mm3 = 23,393. The shaft thickness is 23mm and 23mm3 = 12,167 making the shaft with the adapter much stiffer.
It was obvious that for roller skis we needed a flexible but strong adapter plate. We decided to make the adapter plate 3.2mm thick using a high strength low modulus material, bonded to a 0.75mm thick foam core with low surface energy vibration dampening adhesive tape. The result is a very pliable unit that when bonded and screwed to the roller ski shaft does not alter the ski characteristics of the roller skis.
FEATURES OF THE NEW V2 BINDING ADAPTER PLATE
The pliable but strong V2 adapter for NNN Xcelerator bindings is the only adapter that does not alter the flex characteristics of roller skis. Roller ski shafts flex between the wheels, while snow skis have a stiff center and flex mainly by the softer tip and tail of the ski.
Unlike existing adapters, the V2 mono adapter accepts both the binding and the heel stabilizer in one unit. There are six mounting positions for the binding and three positions for the heel stabilizer. These multiple positions allow the binding to move 51mm (2 inches) to fit virtually all shoe sizes.
The V2 adapter has a 2mm lower center of gravity than existing adapter plates, the lowest possible with the present binding design. This is very important for roller skis because a lower center of gravity makes the skis more stable.
The V2 adapter is the lightest we know, weighing less than 55 grams including the mounting hardware.
According to some reports, road vibration has caused the NNN bindings locking mechanism to malfunction. To reduce vibration V2 adapters incorporate the 0.75mm adhesive dampening membrane between the ski and the adapter plate. In addition to the vibration dampener between the ski and the adapter, the V2 mounting kit includes high strength security plates. The NNN rear-binding stop is designed to prevent rearward motion and the front stop to prevent forward motion. The security plate can be mounted to the adapter in such a manner that if the rear binding stop should malfunction the security plate will secure the binding.
The adapter is fastened to the ski with eight custom designedl self-tapping mounting screws and with the strong double-sided vibration dampening tape. The special screws are better for roller ski shafts as they put less stress on the shaft material than conventional large self-tapping screws. The adhesive tape fastens the adapter uniformly to the ski across the full length of the adapter, providing a better and more secure interface between the adapter and the ski.
Jenex has also developed an inexpensive and easy to use drill jig for the binding adapter. The jig can also be used for the three front screws on conventional Salomon or screw mounted NNN bindings. The V2 mounting jig fits both the narrow XLQ and XLA shafts and the wider XL Aero shafts. For V2 roller skis the adapter holes will be properly centered without having to use calipers or any other measuring equipment. The jig can also be used on other roller ski brands, but for some non-V2 brands the jig location must be measured using an accurate caliper. The binding jig also includes alignment aides to ensure that the binding is accurately positioned on the ski.
Two NNN bindings shown in 1st positon. The Xcelerator binding shown in the top photo has a lower center of gravity and is more stable for roller skiing than the Quick Lock binding shown in the lower photo.
The two NNN bindings shown in the 6th position (51mm from 1st position making the V2 adapter plate suitable for almost any size boot.)
V2 roller skis can be ordered with or without the binding adapter mounted. To have the binding adapter mounted list the roller ski model number followed by BA in capital letters. For example if you are ordering an XLQ98M or an XLA910 and you want the NNN binding adapter plate mounted you would order XLQ98MBA or XLA910BA.
(Patents pending for the unique drill jig and the binding adapter.)