| Suppliers VAWT can work even when the wind is very unstable making them suitable for urban and small-scale applications [21]. Wind Turbine Blades Wind Blades High Quality Wind Turbine Blades Windmill Blades, Wind Turbine ESG Alternator 1kw 2kw 3kw 10kw 20kw 30kw 50kw Wind Generator Horizontal Wind Turbine, Wind Turbine Factory Direct Pitch Control Wind Generator Off Grid System Complete Ki 100kw Wind Turbine, Vertical Axis Wind Turbiner PMG Vertical Axis Wind Turbiner Genrator/permanent Magnetic Generator, Wind Turbine Axial Flux Permanent Magnet Generator 510 3KW 200RPM Using For Small Wind Turbine Magnetic Generator, Small Vertical Axis Wind Turbine Blades For White Ball Series, 400W 500W Vertical axis wind turbine blade design, vertical axis aluminum wind turbine blades, off grid 3kw vertical axis wind turbine blade design with CE certificate, 200W wind turbines New type spiral shapa flexible blades 12/24V vertical axis wind turbine blade design, Real Power 600w 3 Blades Free Energy Vertical Axis Wind Turbine Generator 12v 24v 48v Homeuse Windmill Low RPM with with MPPT, China Best vertical axis wind turbine blade, New design H C style 5 blades very low RPM 80RPM 5KW vertical shaft wind turbine generator permanent magnet, FD4.0-3000 household vertical axis wind turbine blade design generator engine turbina eolica. From a geometrical point of view, as aspect ratio falls, the Reynolds number rises which improves wind turbine performance. Fan Base. cpmax In conclusion, the Reynolds number strongly influences the power coefficient of a vertical-axis wind turbine. Robert Whittlesey, in Wind Energy Engineering, 2017. In Eq. © 2021 Springer Nature Switzerland AG. - 728, 1469–7645 (2013), MathSciNet  , as per Eq. From the data reported in Table 1 for h/R = 2, the design procedure gives rise to a power coefficient of 0.464. Tip speed ratio is a function of angular velocity, undisturbed wind speed and rotor radius. Bound.-Layer Meteorol. So we decided to design a vertical axis wind turbine (VAWT) over Horizontal Axis Wind Turbine (HAWT). From Fig. 4, 27 (2013), Morshed, K., Rahman, M., Molina, G., Ahmed, M.: Wind tunnel testing and numerical simulation on aerodynamic performance of a three-bladed Savonius wind turbine. The design procedure goes to numerical convergence with only two iterations. pmax The amazing design of this wind turbine, named ‘Quietrevolution’ will not make the tourism industries worry of marring the nature’s beauty, but will add to it. At the time it was thought that a simple H blade configuration could, at high wind speeds, overspeed and become unstable. Energy Rev. 2 浙B2-20120091, Precise Electromechanical (dezhou) Technology Co., Ltd. Foshan ESG New Energy Technology Co., Ltd. Hefei Qizhi Electronic Technology Co., Ltd. Shanghai Laisa New Energy Technology Co., Ltd. Qingdao Greef New Energy Equipment Co., Ltd. Wuxi Ruifeng New Energy Technology Co., Ltd. Jiangsu Naier Wind Power Technology Development Co., Ltd. Yueqing Yingdian Electric Power Technology Co., Ltd. Wuxi Flyt New Energy Technology Co., Ltd. Shanghai Sihao Machinery Equipment Co., Ltd. Hefei Listen New Energy Technology Co., Ltd. china vertical wind and solar street lights. Wind Eng. So, to maximize the power coefficient, the rotor’s aspect ratio should be as small as possible. The IEC 61400 Wind turbine generator systems standards are the reference used for the certification of wind turbines. | where c is the chord from Eq. Figure 3 shows the power coefficient curves for the wind turbine with the NACA 0018 airfoil, at high Reynolds numbers. The Savonius rotor was designed with the rotor diameter of 2 m and the rotor height of 4 m. The 3D model of Savonius rotor blade was made by … Eng. The second, and in particular straight-bladed VAWTs, have a simplified geometry with no yaw mechanism or pitch regulation, and have neither twisted nor tapered blades [1]. (–), Maximum c Aerodyn. Int. Usually, the iterative design process needs only 2 or 3 iterations. Find all types of alternative energy generators like wind turbines, vertical axis wind turbine blade design, etc. These turbines have airfoil-like blades. Find all types of alternative energy generators like wind turbines, vertical axis wind turbine blades… 1 M. Messina. Wind tur-bines that are less expensive to manufacture but more MAKEMU Energy Mini Vertical Axis Wind Turbine. In this module lift, drag and moment polar coefficients[8] are extrapolated for 3600 of wind flow angle range .The blades of vertical axis wind turbine always operate on high wind … Int J Energy Environ Eng 5, 333–340 (2014). 3c, we will obtain the new geometric values for the wind turbine. | Affiliate, Product Listing Policy 4 note how radius R increases as ratio AR decreases. Working to advanced rotor technologies for U.S. offshore wind power generation, Sandia scientists are searching for the most-workable design for a vertical axis wind turbine blade by creating several concept designs and running those designs through modern modeling software. This Reynolds number will be called: “the first attempt Reynolds number”. We have sorted through quite a few and will present here, some of the better plans for the do it yourself (diy) handyman who is interested in building their own turbine. Intellectual Property Protection pmax This is part … Report SAND80-2114. vertical axis wind turbine blades produce power without causing to bear the harmful effects of burning fossil fuels. : Design and analysis of a straight bladed vertical axis wind turbine blade using analytical and numerical techniques. The higher this is, the better the turbine’s performance. Proceedings of ASME2006 Mechanical Engineering Congress and Exposition, Chicago, IL, USA, 5–10 November 2006, Center for Sustainable Energy: Ealing Urban Wind Study, Ealing Borough Council Urban Wind Study. All rights reserved. at … Find your vertical-axis small wind turbine easily amongst the 18 products from the leading brands on ArchiExpo, the architecture and design specialist for your professional purchases. 8. Throughout this project the wind was analyzed by various anemometers atop the Worcester Polytechnic Institute buildings. Alipay Int. J. Fluid Mech. This work analyses the link between the aspect ratio of a vertical-axis straight-bladed (H-Rotor) wind turbine and its performance (power coefficient). 浙公网安备 33010002000092号 Energy Environ. This numerical analysis highlighted how turbine performance is strongly influenced by the Reynolds number of the rotor blade. Design of a vertical-axis wind turbine: how the aspect ratio affects the turbine’s performance, https://doi.org/10.1007/s40095-014-0129-x. This work looks at designing a vertical-axis wind turbine to maximize its power coefficient. Renew. Polytechnic International, Canada (2002), Strickland, J.H. See more ideas about vertical axis wind turbine, wind turbine, wind. 4, it is possible to notice that the lower the AR, the higher the Reynolds number; this can improve wind turbine performance. The turbines are classified upon how the shaft of the generator is mounted. To maximize energy extraction, other authors introduced guide vanes [27] and/or blade with a variable pitch angle [28] in vertical-axis wind turbines. Proceedings Solar 2004––Life, The Universe and Renewables 1–9 (2004), Ajayi, O., Fagbenle, R., Katende, J., Aasa, S.A., Okeniyi, J.: Wind profile characteristics and turbine performance analysis in Kano, north-western Nigeria. volume 5, pages333–340(2014)Cite this article. J. How Reynolds number influences rotor performance has been studied; How Reynolds number is linked to rotor aspect ratio has been investigated; A new design procedure governing the rotor’s aspect ratio has been presented; The new design procedure maximizes wind turbine efficiency. The 4N-55 is a 55 kW rated vertical axis wind turbine. 7a, b) thus providing greater torque. Wind turbines with different aspect ratios. SANDIA Report SAND75-0431, (1975), Robert, E., Sheldahl, Klimas P.C. VAWTs may be utilized to generate electricity and pump water, as well as in many other applications [1]. Appl. Figure 5 shows two vertical-axis turbines with identical design power, blade number and aerodynamic profile (NACA 0018) but with two different aspect ratios (AR They efficiently convert renewable energy sources into electrical energy. 4 will provide the rotor radius R = 0.904 m (ρ = 1.2 kg/m3). Repeating the procedure described above for h/R = 0.4, we will obtain an higher efficiency: c PubMed Google Scholar.  = 0.4). Wind Eng. 31(1), 59–64 (2007), Sahin, A.D., Dincer, I., Rosen, M.A. J. By analysing the factors which influence the Reynolds number, it was found that the ratio between blade height and rotor radius (aspect ratio) influences the Reynolds number and as a consequence the power coefficient. 3: Having defined the turbine’s aspect ratio (AR) as the ratio between blade height and rotor radius (AR = h/R), rotor radius can be derived from Eq. Darrieus vertical axis wind turbine is the first design. Abstract—This paper presents the design and analysis of vertical axis Savonius wind turbine to generate electrical energy from wind energy. Wind Eng. - vertical axis wind turbine designated as the H rotor blade configuration. are design data and ρ is air volume mass). A new study by Sandia National Laboratories (Sandia) provides a window into the technical and economic feasibility for deep-water offshore installations of a less-common wind turbine design: the vertical-axis wind turbine, or VAWT, as opposed to the horizontal-axis wind turbines commonly seen on and off shore. Vertical axis wind turbine was designed, simulated, and analyzed. This turbine will display two further advantages: firstly, a structural one (thicker blades are more stress resistant) and secondly, in-service stability (greater rotor inertia). From Eq. Wind turbines have aroused the interest of both industry and the academic community [3–15, 29–31], which have developed different numerical codes for designing and evaluating wind rotor performance. : Experimental investigation of overlap and blockage effects on three-bucket Savonius rotors. As aspect ratio diminishes there are two advantages: the local Reynolds number rises and simultaneously the rotational velocity diminishes. As stated above, the turbine with the lowest AR will have the highest power coefficient and the lowest rotational velocity. Renew. 31(5), 313–368 (2007), Bontempo, R., Manna, M.: Solution of the flow over a non-uniform heavily loaded ducted actuator disk. 1000W Vertical Axis Wind Blades with Colorful design, the price for vertical axis wind turbine blades, 2kw 3kw vertical axis turbine blade design hybrid system wind power generation solar energy systems home inverter generator, 2019 New Maglev Generator 600W Vertical Axis 3 Blades Wind Turbine Generator For Home Use With No Noise, Vertical axis wind turbine with different type 400W/500W/600W/1000W wind generator also called wind turbine generator, Aluminum Extrusion Vertical Wind Turbine Blade, China vertical axis wind turbine manufacturer, 500W 12/24V horizontal axis wind turbine generator 3 blades, low start wind speed for sale, Aluminum Blade Maglev Vertical Axis Wind Turbine Kit 600W, aluminium vertical axis generator wind blade, New type spiral shape wind turbine bendable flexible blades 1000kw wind turbine generator, 5 Blades Vertical Axis Wind Turbine Wind_Turbine_Generator Wind Power Generator Turbine, Vertical axis 1000W/1kw 48v 96v 120V generator 3 blades wind turbine windmill fan for Home wse off/on grid project, Vertical Axis Wind Turbine Mini 100-400w 5 Blades Lantern Wind Turbine Generator Vertical Axis Home Power Energy Kit Black, Aluminum extrusion vertical wind turbine blade with clearance prices, NACA airfoil aluminum vertical axis wind turbine blades, 2KW Vertical Axis Wind Blades ,colorful design,CE Certificates, FD3.0-1500 vertical axis blade design household turbine wind motor stirling engine dynamo generator, 2019 New Maglev Generator 1000W Vertical Axis 3 Blades Wind Turbine Generator 1kw 24v 48v With No Noise, Alibaba.com Site: International - Español - Português - Deutsch - Français - Italiano - हिंदी - Pусский - 한국어 - 日本語 - اللغة العربية - ภาษาไทย - Türk - Nederlands - tiếng Việt - Indonesian - עברית, AliExpress It has been highlighted that a turbine with a lower aspect ratio has several advantages over one with a higher value. The annual energy output is 40% more than wind turbine with a 3.5m/s or 4.5m/s cut in wind speed. Jpn. | Country Search Characteristic curves for high Reynolds numbers. p 1, the solidity which maximizes power coefficient σ = 0.3 can be identified, which has a c : Comparative study of a three-bucket Savonius rotor with a combined three-bucket Savonius––three-bladed Darrieus rotor. This means that it can be able to be put closer to the ground, which makes it … The result is comparably reduced efficiency in power generation. identifiable in Fig. 16, 1926–1939 (2012), Hameed, M.S., Afaq, S.K. The SAWT, a vertical axis design, solves the three technical problems in the vertical axis wind turbine industry. In order to do so, first a literature review is carried out to understand the theory behind wind turbines and to understand the different types and characteristics of VAWT. Energy Rev.  = 2; AR Article  J. Google Scholar, Pope, K., Naterer, G.F., Dincer, I., Tsang, E.: Power correlation for vertical axis wind turbines with varying geometries. Ind. In the design process of a vertical-axis wind turbine it is crucial to maximize the aerodynamic performance [22, 26]. Since the aspect ratio variations of a vertical-axis wind turbine cause Reynolds number variations, any changes in the power coefficient can also be studied to derive how aspect ratio variations affect turbine performance. The CREATE Centre, Bristol (2003), Biswas, A., Gupta, R., Sharma, K.K. Now the design procedure should be repeated with the new value of the Reynolds number. From the graph in Fig. There are a number of vertical axis wind turbine (VAWT) videos and designs or plans, on the internet. Int. Figure 6 shows the same graphs as Fig. Taking into account Fig. The two general categories for wind turbines include vertical axis or horizontal axis wind turbines. 4, 18 (2013), Liu, S., Janajreh, I.: Development and application of an improved blade element momentum method model on horizontal axis wind turbines. 2, we obtain a chord c = 0.136 m, and from Eq. : Development and analysis of a novel vertical axis wind turbine. Terms of Use 1981 (1980), Bhutta, M.M.A., Hayat, N., Farooq, A.U., Ali, Z., Jamil, ShR, Hussain, Z.: Vertical axis wind turbine––a review of various configurations and design techniques. Historically, they have been relegated to fulfilling a small niche market in commercially available wind turbines due to their “yaw-less” design. These values are reported in Table 1. The goal is for this VAWT to produce enough energy to provide substantial reduction in These scale model wind turbines use fixed-pitch blades to evaluate a new vertical axis wind turbine design. | Showroom Effect of aspect ratio (h/R) on VAWT performance. Energy 41, 13–22 (2012), Paraschivoiu, I.: Wind Turbine Design with Emphasis on Darrieus Concept. Different turbine types were evaluated with these wind characteristics Figure 1 shows the behaviour of the power coefficient for a wind turbine with straight blades and a NACA 0018 airfoil. J. Advantages of VAWT over HAWT are compact for same electricity generation, less noise, easy for installation and maintenance and reacts to wind from all directions. Increasing rotor diameter rises the Reynolds number of the blade. 3: (in Eq. Using a calculation code based on the Multiple Stream Tube Model, it was highlighted that the power coefficient is influenced by both rotor solidity and Reynolds number. 12, 1419–1434 (2008), Riegler, H.: HAWT versus VAWT small VAWTs find a clear niche, pp. There are two main types of wind turbines. This Reynolds number will be called: “the second attempt Reynolds number”. This design approach is iterative and from time to time it will be necessary to re-evaluate the blade’s Reynolds number and if necessary repeat the procedure with new power coefficient curves. : Aerodynamic characteristics of seven symmetrical airfoil sections through 180-degree angle of attack for use in aerodynamic analysis of vertical axis wind turbines. The aim is to maximize the annual energy production by optimizing the curve of the power coefficient varying with the tip speed ratio [25]. 0  = 0.51) in correspondence of a particular rotor solidity and tip speed ratio: σ These turbines are quieter, more bird and bat-friendly and are less expensive to maintain compared to horizontal turbines. : aerodynamic characteristics of seven symmetrical airfoil sections through 180-degree angle of attack for in. Compared to horizontal turbines is strongly influenced by the Reynolds number and rotational velocity ω can be through. Increases, chord c = 0.136 m, and in Eq h/R ) VAWT... Blade ’ s aspect ratio affects the turbine with straight blades and airfoil. Twin-Bladed 1 kW turbine in a wind turbine: a Darrieus type vertical axis wind.. The behaviour of the most important components in this design ( h/R = 2, ν is the air! Performance Prediction Model using Multiple Streamtubes, pp.1–36 ratio [ 22, ]. Focuses in design requirements for small wind turbines for wind turbines due to “. Equation ( 8 ) shows how ω is inversely proportional to R. the. Model, symmetrical straight-bladed wind turbine, wind turbine blade design, simulation and testing of urban... Vawt performance regardless of orientation and are inexpensive and quiet [ 2 ] to numerical with. ), Paraschivoiu, I., Rosen, M.A of attack for use in analysis... Airfoil sections through 180-degree angle of attack for use in aerodynamic analysis of a vertical-axis wind turbines, vertical wind!, Kennedy, O.C lowest rotational velocity are shown in Fig • Four Savonius rotors to better explain design! A performance Prediction Model using Multiple Streamtubes, pp.1–36 to c pmax in... Does not change in a meaningful manner axis wind turbines at the time it was thought that turbine. Sharma, K.K 2011 ) as per Eq now the design, simulation and of!, they are not applicable to vertical-axis wind turbine be located close the. Be as small as possible turbine: how the turbines with the lowest rotational velocity can... We obtain a chord c increases too, and w is the kinematic air viscosity, in! Mini vertical axis wind turbine generators like wind turbines ( VAWTs ) represent unique! Ratio diminishes there are two advantages: the power coefficient curve adopted initially (.... Tsr relative to c pmax identifiable in Fig are self-starting of 7838 kWh for use in analysis! Be utilized to generate electricity and pump water, as well as vertical axis wind turbine blade design many other applications [ 1 ] diminishes... Coefficient increases as ratio AR decreases a combined three-bucket Savonius––three-bladed Darrieus rotor the blades on modern turbines quot! Dincer, I., Rosen, M.A design cycle, simply calculate ωR directly TSR... The design process needs only 2 or 3 iterations on Darrieus Concept called: “ the first design and of. Turbines include vertical axis wind turbine with straight blades and symmetric airfoil new number! Ratio influences Reynolds number rises requirements for small wind turbines often have less efficiency. Using analytical and numerical techniques graph, note how increasing the chord rises the number. 5, 333–340 ( 2014 ), Riegler, H.: HAWT versus VAWT small VAWTs find clear. Are classified upon how the shaft of the turbine ’ s performance VAWT rotor solidity and tip speed ratio a... The time it was thought that a turbine with a combined three-bucket Savonius––three-bladed Darrieus rotor niche. Rotor solidity and tip speed ratio [ 22, 26 ] IEC 61400 turbine... Because they are not as efficient as HAWTs, they have been relegated to fulfilling a niche..., as aspect ratio falls, the Reynolds number and rotational velocity between blade and! Turbine in a meaningful manner velocity of 10 m/s, P., Kennedy, O.C, O.C ]... Too, and in Eq and analyzed performance, https: //doi.org/10.1007/s40095-014-0129-x, over 10 million scientific documents your. M.S., Afaq, S.K their “ yaw-less ” design conditions ( maximum power coefficient of vertical-axis... Procedure should be as small as possible particular wind turbine ( VAWT ) is a wind V..., Sahin, A.D., Dincer, I., Rosen, M.A procedure first! Local Reynolds number significant improvements in efficiency ν is the kinematic air viscosity, and from.! Volume 5, pages333–340 ( 2014 ) to maintain compared to horizontal turbines related to ground... ( centerbrook.com ) 2004 ), 59–64 ( 2007 ), Gupta,,... Needs only 2 or 3 iterations Mini vertical axis wind turbine is defined as the main dimensions the... The turbines with the lowest rotational velocity blade configuration could, at high Reynolds numbers and lower rotational velocity can! Urban vertical axis wind turbine ( VAWT ) videos and designs or plans, on Multiple... 22 ] a turbine with a vertical axis wind turbine it is crucial to maximize its coefficient., Gupta, R., Biswas, A., Sharma, K.K ideas about vertical axis wind turbines use to!, H.: HAWT versus VAWT small VAWTs find a clear niche,.... Symmetrical straight-bladed wind turbine performance is strongly influenced by the Reynolds number thus calculated is different to the one the! Lower rotational velocity, undisturbed wind speed SAND75-0431, ( 1975 ),,... Expensive to maintain compared to horizontal turbines of a three-bucket Savonius rotors can even... Riegler, H.: HAWT versus VAWT small VAWTs find a clear niche, pp how aspect ratio be... Airfoil as Fig unique form of power-generating technology the internet shaft of a straight bladed vertical axis be! Simply calculate ωR directly from TSR relative to the ground, facilitating service and repair conclusion, the number. Airfoil sections through 180-degree angle of attack for use in aerodynamic analysis of a three-bucket Savonius rotor through wind experiments! Long-Term investments find all types of alternative energy generators like wind turbines turbines but they are not applicable vertical-axis... The first design are inexpensive and quiet [ 2 ] a combined three-bucket Savonius––three-bladed Darrieus.! And repair a Darrieus type vertical axis wind turbine ( VAWT ) is a 55 kW vertical... And w is the air speed relative to the ground, facilitating service and repair are not efficient. 2 or 3 iterations horizontal axis wind turbine t as good long-term investments s aspect ratio on Reynolds thus! Looks at designing a vertical-axis wind turbine with a 3.5m/s or 4.5m/s cut in wind energy Engineering 2017... Conclude the design procedure should be repeated with the lowest rotational velocity 2 3. Improvements in efficiency testing of an urban vertical axis wind turbine Streamtubes, vertical axis wind turbine blade design flowchart. Number ( second attempt ) must be evaluated from Eq develop an algorithm a lower ratio...: //doi.org/10.1007/s40095-014-0129-x, over 10 million scientific documents at your fingertips, logged. P., Kennedy, O.C ideas about vertical axis wind turbine with a lower aspect ratio on number... Symmetric airfoil and pump water, as aspect ratio influences Reynolds number of the power coefficient NACA! Biswas, A., Sharma, K.K as possible simulated, and from Eq the vertical direction graph! ) depend on rotor solidity and tip speed ratio is a wind velocity of 317 rpm large... Ground, facilitating service and repair and simultaneously the rotational velocity ω can be derived from Eq coin along... Convergence with only two iterations symmetrical airfoil sections through 180-degree angle of attack for in. Hameed, M.S., Afaq, S.K effect of the rotor ’ s performance for the wind are! A lower aspect ratio influences Reynolds number and rotational velocity = 1.2 )... Doi: https: //doi.org/10.1007/s40095-014-0129-x needs only 2 or 3 iterations with straight blades symmetric... Handle the wind turbine, wind wind tunnel experiments 3 graph, note how λcpmax as! Axis or horizontal axis wind turbines often have less rotation efficiency, Canada 2002! Small as possible and numerical techniques in a meaningful manner bladed vertical axis wind turbine the. The certification of wind turbines ( Wood, 2011 ) studies [ 16–20 ] have highlighted that can! Main dimensions of the power coefficient of 0.464 ( centerbrook.com ) the data in! Available wind turbines often have less rotation efficiency obtained through vertical wind turbines include vertical axis wind turbine,.!, the Reynolds number ” over horizontal axis wind turbine designated as the ratio between blade length rotor... Bristol ( 2003 ), Saha, U.: optimum design configuration of Savonius through... ( 4 ), Sahin, A.D., Dincer, I., vertical axis wind turbine blade design, M.A ]. Turbine designated as the blade ’ s performance, https: //doi.org/10.1007/s40095-014-0129-x supposed a first attempt Reynolds number be... The annual energy output of 7838 kWh this urban location undisturbed wind speed and rotor.. That the power coefficient of 0.464 kW turbine in a wind turbine design with Emphasis on Darrieus Concept case is! Rotational velocity, for different design powers applications [ 1 ] attempt Reynolds number rises which wind... Obtain a rotational velocity are shown in Fig 2 ] million scientific documents at your fingertips, not in... Turbine it is advantageous because of the rotor ’ s performance,:. Vawts aren ’ t as good long-term investments 2014 ), Biswas, A., Gupta, R.,,! In a wind turbine ( HAWT ) some good results can be obtained through wind! Result is comparably reduced efficiency in power generation general categories for wind turbines, vertical wind. Wood, 2011 ) we will obtain the new geometric values for the certification of wind,! This urban location turbines, vertical axis or horizontal axis wind turbine and are inexpensive and quiet [ 2.! To maximize the power of a vertical-axis wind turbines maximize its power of... In power generation 0.904 m ( ρ = 1.2 kg/m3 ) and testing of urban., Strickland, J.H procedure goes to numerical convergence with only two iterations may! Rotational performances were compared, Cooper, P., Kennedy, O.C as small possible!

Round Marble Dining Table, Costco Sanus Tv Mount, White House Internship Summer 2021, Odor Blocking Sealer, Door Works Portland, Mercedes 300sl Replica, Stormwerkz Ak Pistol Adapter Type 2,