[Yamaha Signus Griffas] If you lose the lightness and good handling, you cannot claim "Signus"

Signus X is the two -kind scooter in Yamaha, which began to be released in 2003. Although it has been widely supported as a city commuter with excellent convenience, "Cygnus Glifus", which has been renewed recently, debuted. This time, stomach was able to hear various episodes from the development members. stomachnterviews introduced in the front and rear part of seeing related images. stomachn the first part, we will ask about the background of the engine from air cooling to water cooling, and the body and frame developed to install it. [stomachnterview Participating members] Mitsuru Mochizuki: Project Leader CV Development Department SC Design G Yuki Yanagihara Yuki Yanagihara: Category Project Leader GB Commuter Group Yuki Katsuyama: Engine Design PC 1PT Design SC-PT Design G Masashi Fujiwara: Engine experiment PC 1PT Experiment Department SC-PT Experiment G, which has accumulated improvements, "Glyphus" ---: Cygnus X, the predecessor model, has gained popularity as a standard model of the 125cc class. The first appearance was in 2003, so it was a very long model. Mochizuki: F in 2007.stomach.In addition to adopting (fuel injection) to enhance environmental performance, we have accumulated improvements according to needs and times, such as the addition of tachometer (2011) and the disk of the rear brake (2015). Although it can be roughly divided into five generations, the concept has been polished while protecting the concept. ----: Signus X had a catch phrase called "Toughness Comfort Commuter". What was this? Mochizuki: The purpose was to enhance all elements required as a city commuter, such as driving, economy, and convenience. When compared to a rival model, it exceeds the ranks by all items. The model that has focused on raising such thorough performance is Cygnus X. -----: This time, the end of the car name has been changed from "X" to "Griffas" (= large birds of prey such as Condor). Please tell me the intentions and aims there. Mochizuki: In addition to the main components such as engine and frame, the exterior design has been renewed. In other words, we decided to change the car name so that everything was newly newly felt. ----: Does that mean that it is a city commuter? Mochizuki: No, the addition of the driving, economy, and convenience I mentioned earlier is the same even if it becomes Griffas. We believe that the development has been promoted from the final model of X to improve the performance, and the concept of the concept has been made significantly without changing. ----:I see. When did the development start? Mochizuki: About 5 years ago. The biggest reason is compatibility with environmental performance. As you know, regulations surrounding motorcycles are increasing year by year, led by exhaust gas regulations. Among them, X was consistently adopted an air -cooled engine, and there was sufficient competitiveness, but the limit will soon come. Assuming that, the development project has started from a simulation assuming water cooling. The difference between water cooling and the difference between NMAX ----: Speaking of a 125cc class scooter equipped with a water-cooled engine, "NMAX" is available. Is it the same type of Griffas engine? Mochizuki: Basically the same unit, it is optimized according to Griffas. ----: What exactly is it? Fujiwara: It is a part mainly related to the transmission mechanism. While NMAX has a major market in Europe, Griffas is Taiwan and Japan. Because the speed range and road environment used are different, the shifting characteristics are changed. Review the deceleration ratio and realize a light acceleration by making it low gear. Since there are many situations where stop and go are more useful than Europe, settings are made that emphasizes the smallness of starting acceleration. ----: Water cooling becomes powerful (x: 9).8ps / Griffas: 12ps), focusing on response at low speeds than NMAX.Are you worried about fuel economy for users who value economics?Katsuyama: The water -cooled engine we call "Blue Core" is much better than air -cooled engine, and the friction is reduced, while friction is reduced.They are also reflected in fuel economy, and as a result, they grow about 20 % compared to X.Fujiwara: In comparison with NMAX, WMTC mode values are slightly lower (2).4km/liter difference), 60km/h fixed fuel efficiency is 0.Almost equivalent to the difference between 1km/liter.NMAX numbers are functioning the idling stop system, so I don't think it's a disadvantage under the same conditions.----: That's true.Comparing the catalog specifications, the fuel economy of X is 37.While it was 3km/liter (WMTC mode value), Griffas 44.The difference between 5km/liter is obvious.The fuel tank capacity is slightly reduced (x: 6).5 liters / Griffas: 6.It is a calculation that extends nearly 30km when considering the cruising range. Yanagihara: If you look at the engine alone, the benefits of water cooling are great, but there are some parts that are not straightforward, which is the larger engine. If you lose the lightness and the goodness of handling, you cannot claim the "Signus". I think that is. Is it possible to tell me how big or heavy? Katsuyama: The width of the engine is about 100mm, and the weight is about 4 kg. (Including supplements) ----: It is a size that can be expressed as completely large. It is also convinced that the frame has been renewed. The release says "adoption of left and right asymmetrical main pipes". Is this a device to hold the engine? Yanagihara: That's right. There is a radiator on the right side of the engine body and an air cleaner box on the left side, so if you try to mount it on the same design frame, the wheelbase and body width will expand. Then, the lightness and goodness of handling of the conventional model will be lost, and there is no necessity to claim the signus. As a result, I struggled to maintain a compact body. One of them is that the main pipe has become asymmetric left and right, which is the result of exploring the position where the engine can be secured while packing the engine forward. ----: The increase in the weight of the engine means that the rigidity of the frame that supports it has to increase. What are the measures around that? Yanagihara: This time, we use a lot of high -tension steel plates to ensure rigidity. In addition, the number of parts points is reduced by excluding the reinforcement components that have been reinforced by reviewing the space efficiency and consolidating the complement brackets. As a result, 0.We were able to achieve 4kg lighter weight and 25 % rigidity.Despite the increased 4kg weight between the engine and its assistants alone, the Glifus is kept to a 6kg plus (X: 119kg / Griffas: 125kg) in the entire vehicle.However, isn't it affected by the light handling, which is the original character?Also, what kind of safety and convenience are evolving?In the second part, we will explore that area.

Response Takahiro Itami