| 词条 | Viper 640 |
| 释义 |
|name = Viper 640 |insignia = |insignia size = |insignia alt = |insignia caption = |line drawing = |line size = |line alt = |line caption = |image boat = File:Viper 640 sailboat 3008.jpg |image size = |image alt = |image caption = |designer = Brian Bennett |location = United States |year = 1996 |no built = 400 |design = |class = |brand = |builder = Viper Boats Rondar Raceboats |role = |boats = |crew = |trapeze = |draft = {{convert|4.49|ft|m|abbr=on}} daggerboard down |air draft = |displacement = {{convert|750|lb|kg|0|abbr=on}} |hulls = |hull type = Monohull |construction = Fiberglass |loa = {{convert|21.08|ft|m|abbr=on}} |loh = |lwl = {{convert|19.08|ft|m|abbr=on}} |beam = {{convert|8.17|ft|m|abbr=on}} |hull draft = |hull weight = |engine = Outboard motor |appendages = |keel type = bulb daggerboard keel |ballast = {{convert|262|lb|kg|0|abbr=on}} |rudder type = transom-mounted rudder |rigs = |rig type = Bermuda rig |I = {{convert|21.98|ft|m|abbr=on}} |J = {{convert|7.48|ft|m|abbr=on}} |P = {{convert|25.62|ft|m|abbr=on}} |E = {{convert|10.07|ft|m|abbr=on}} |mast length = |rig other = |sails = |sailplan = Fractional rigged sloop |sailarea main = {{convert|129.00|sqft|m2|abbr=on}} |sailarea headsail = {{convert|82.21|sqft|m2|abbr=on}} |lp = |sailarea spin = {{convert|425|sqft|m2|abbr=on}} |sailarea gen = |sails other = |sailarea upwind = |sailarea downwind = |sailarea total = {{convert|211.20|sqft|m2|abbr=on}} |rating = |d-pn = |rya-pn = |phrf = 99 (average) |status = |previous = |successor = }} The Viper 640 is an American trailerable sailboat, that was designed by Brian Bennett for racing and first built in 1996.[1][2] The Viper 640 is an accepted World Sailing class boat.[3] ProductionThe boat was originally built by Viper Boats in the United States and then in 2005 Rondar Raceboats of the United Kingdom was named the official class manufacturer. 400 examples had been completed by 2018.[1][4] DesignThe Viper 640 was designed to combine the planing performance of a dinghy with the stability of a keelboat. The result is a small recreational planing keelboat, built predominantly of fiberglass, with carbon fiber spars. It has a fractional sloop rig, a plumb stem, an open transom, a transom-hung rudder and a lifting fin daggerboard-style keel, with a weighted bulb, with {{convert|220|lb|kg|0|abbr=on}} of lead ballast. The keel is retained in the down position with two bolts while sailing. The design displaces {{convert|750|lb|kg|0|abbr=on}} and is equipped with an asymmetrical spinnaker of {{convert|425|sqft|m2|abbr=on}} for downwind sailing.[1][3] The boat has a draft of {{convert|4.49|ft|m|abbr=on}} with the daggerboard extended and {{convert|1.83|ft|m|abbr=on}} with it retracted, allowing ground transportation on a trailer.[1] The boat may be optionally fitted with a small outboard motor for docking and maneuvering.[1] The design has a PHRF racing average handicap of 99 with a high of 111 and low of 96. It has a hull speed of {{convert|5.85|kn|km/h|2|abbr=on}}.[5] See also
References1. ^1 2 3 4 {{cite web|url = http://sailboatdata.com/viewrecord.asp?class_id=4198|title = Viper 640 sailboat specifications and details|accessdate = 30 May 2018|last= Browning| first = Randy |work = sailboatdata.com|year = 2018}} 2. ^{{cite web|url =http://sailboatdata.com/view_designer.asp?designer_id=459|title = Brian Bennett |accessdate = 30 May 2018|last= Browning| first = Randy |work = sailboatdata.com|year = 2018}} 3. ^1 {{cite web|url = http://www.rondarboats.com/raceboats/viper/specification/index.html|title = Rondar Viper 640 - Specification - Now a World Sailing Class!|access-date = 30 May 2018|author=Rondar Raceboats |work = www.rondarboats.com|year=2018}} 4. ^{{cite web|url =http://sailboatdata.com/view_builder.asp?builder_id=250|title = Rondar Raceboats|accessdate = 30 May 2018|last= Browning| first = Randy |work = sailboatdata.com|year = 2018}} 5. ^{{cite web|url = http://www.sailingjoy.com/sailboat_specs/sailboat_specs/view/3786/viper-640|title = Sailboat Specifications for Viper 640 |accessdate = 30 May 2018|work = Sailing Joy|author= InterVisionSoft LLC|year = 2018}} External links{{Commons category}}
4 : Keelboats|1990s sailboat type designs|Sailing yachts|Trailer sailers |
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