HKS 700E

{{Short description|Japanese aircraft engine}}  {{infobox aero engine | name=HKS 700E | image=HKS 700E Flightstar.jpg | caption=HKS 700E mounted on a [[Flightstar II]] |engine_type=Twin cylinder [[four-stroke]] [[aircraft engine]] |manufacturer=[[HKS (company)|HKS]] |national_origin=[[Japan]] |first_run= |major_applications= |produced= |number_built= |developed_from= |variants_with_their_own_articles= }}

The '''HKS 700E''' is a twin-cylinder, [[horizontally opposed]], [[four stroke]], [[carburetor|carburetted]] aircraft engine, designed for use on [[ultralight aircraft]], [[powered parachute]]s and [[ultralight trike]]s. The engine is manufactured by [[HKS (company)|HKS]], a [[Japan]]ese company noted for its automotive racing engines.<ref name="Cliche">Cliche, Andre: ''Ultralight Aircraft Shopper's Guide'' 8th Edition, page G-9 Cybair Limited Publishing, 2001. {{ISBN|0-9680628-1-4}}</ref><ref name="HKS">{{cite web |url = http://www.hks-power.co.jp/hks_aviation/english.htm |title = HKS Aviation |access-date = 2009-12-25 |last = [[HKS (company)|HKS]] |date = n.d. |url-status = dead|archive-url = https://web.archive.org/web/19991013002928/http://www.hks-power.co.jp/hks_aviation/english.htm |archive-date = 1999-10-13 }}</ref><ref name="HKS700E">{{cite web|url = https://www.hks-power.co.jp/hks_aviation/products/700e/spec.html |title = HKS 700E Specifications |access-date = 27 February 2014|last = [[HKS (company)|HKS]] |year = 2011}}</ref>

==Development== The HKS 700E has [[dual ignition|dual]] [[capacitor discharge ignition]], dual [[carburetor]]s and electric start. The engine is mainly [[air cooling|air-cooled]], but with [[oil cooling|oil-cooled]] cylinder heads. The [[Overhead valve|OHV pushrod]] engine has four valves per cylinder, and nickel-ceramic coated cylinder bores. Lubrication is [[dry sump]], with a [[trochoid pump]].<ref name="Cliche" /><ref name="HKS700E" />

The reduction drive is a choice of two integral gearboxes: the A-type gearbox has a 2.58:1 ratio and can accommodate propellers of up to 4,000 kg/cm2 inertial load; the B-type gearbox has a 3.47:1 ratio and can accommodate propellers of up to 6,000 kg/cm2.<ref name="Cliche" /><ref name="HKS700E" />

The 700E burns {{convert|9|L|USgal|1|abbr=on}} per hour in cruise flight at 4,750 rpm. The recommended [[time between overhaul]]s is 1000 hours, although this is expected to be increased as experience is gained.<ref name="HKS700E" />

{{multiple image | total_width = 200 | align = right | caption_align = center | image1 = HKS 700 on a Rans S-12 01.jpg | caption1 = | image2 = HKS 700 on a Rans S-12 02.jpg | caption2 = | footer_background = | footer_align = center | footer = HKS 700E on a [[Rans S-12 Airaile]] }}

Producing {{convert|60|hp|kW|0|abbr=on}} at 6,200 rpm for three minutes for take-off and {{convert|56|hp|kW|0|abbr=on}} at 5,800 rpm continuously, the 700E was designed as a fuel efficient four stroke alternative to the high fuel consumption two stroke engines, such as the [[Rotax 582]].<ref name="Cliche" /><ref name="HKS700E" />

Coupe (facelift)HKS 700E engines from serial number 101105 and above meet ASTM standard 2339-05, which governs the design and manufacture of reciprocating engines for light-sport aircraft. Compliance with the ASTM standard means the aircraft is applicable for use on special or experimental light-sport aircraft (S-LSA or E-LSA).<ref>[https://hksengines.com/technical-info HKS Engines] Compliance Statement July, 2006</ref>

The company's owner's manual disclaimer states:

{{blockquote|WARNING! This is a non-certified aircraft engine, the possibility of engine failure exists at all times. Do not operate this engine over densely populated areas. Do not operate this engine over terrain where a safe, power off landing cannot be performed. The operating and maintenance instructions supplied with this engine must be followed at all times. Flying any aircraft involves the risk of injury or death, building and maintaining your own aircraft requires great personal responsibility.<ref name="HKS700E" /> }}

==Variants== ;700E :Initial version, normally aspirated and producing {{convert|60|hp|kW|0|abbr=on}} at 6200 rpm for three minutes for take-off and {{convert|56|hp|kW|0|abbr=on}} at 5800 rpm continuously.<ref name="Cliche" /><ref name="HKS700E" /> ;700T :[[Turbocharger|Turbocharged]] version with a {{convert|62.5|mm|in|1|abbr=on}} stroke and a compression ratio of 8.8:1, that produces {{convert|80|hp|kW|0|abbr=on}} at 5300 rpm for three minutes for take-off and {{convert|77|hp|kW|0|abbr=on}} at 4900 rpm continuously. The engine's dry weight is {{convert|57.5|kg|lb|0|abbr=on}} equipped with electrical system, electric starter, fuel injectors, gearbox, exhaust system and turbocharger. The initial time between overhauls is recommended as 500 hours, but this is expected to rise with operational experience.<ref name="HKS700TIntro">{{Cite web|url = https://www.hks-power.co.jp/hks_aviation/products/700t/index.html|title = HKS 700T four stroke turbo power|access-date = 3 January 2012|last = [[HKS (company)|HKS Aviation Co.]]|date = 2011}}</ref><ref name="HKS700TSpecs">{{Cite web|url = https://www.hks-power.co.jp/hks_aviation/products/700t/spec.html|title = HKS 700T Specifications|access-date = 3 January 2012|last = [[HKS (company)|HKS Aviation Co.]]|date = 2011}}</ref>

==Applications== {{columns-list|colwidth=22em| *[[Aeroalcool Quasar]] *[[Aeros del Sur Manta]] *[[Aéro Services Guépard Guépe]] *[[Air Creation Skypper]] *[[Air Creation Trek]] *[[Airsport Sonet]] *[[Antares MA-33]] *[[Aviation Products Star Trike]] *[[BAaer Guri]] *[[BB Microlight BB-two seater]] *[[Bede BD-6]] *[[Bede BD-17 Nugget]] *[[Birdman Chinook|ASAP Chinook Plus 2]] *[[Capella T-Raptor]] *[[CBB O2]] *[[CGS Hawk]] *[[Club ULM Rotor Ptenets-2]] *[[Cyclone AX2000]] *[[DTA Combo]] *[[Earthstar Thunder Gull]] *[[Excalibur Aircraft Excalibur]] *[[Fletcher Hercules]] *[[Flightstar|Flightstar II]] *[[Flying K Sky Raider]] *[[Flying Machines FM301]] *[[Harmening High Flyer]] *[[Garland Vampire GA-3]] *[[Green Sky Adventures Micro Mong]] *[[Hy-Tek Hurricane Hauler]] *[[Murphy JDM-8]] *[[Murphy Maverick]] *[[North Wing Sport X2]] *[[Phoenix Air Phoenix]] *[[Quad City Challenger]] *[[Quicksilver GT400]] *[[RagWing RW22 Tiger Moth]] *[[Rainbow Aerotrike]] *[[SlipStream Ultra Sport]] *[[Solo Wings Aquilla]] *[[Sport Flight Talon]] *[[Stellar Astra]] *[[Summit Steel Breeze]] *[[Sundog Two-Seater]] *[[TechProAviation Merlin 100]] *[[Titan Tornado]] }}

==Specifications (700E) ==  {{pistonspecs|   |ref=Cliche & HKS<ref name="Cliche" /><ref name="HKS700E" /> |type=Two cylinder, four-stroke aircraft engine |bore={{convert|85|mm|in|1|abbr=on}} |stroke={{convert|60|mm|in|1|abbr=on}} |displacement=680 cc (41.49 cu in) |length= |diameter= |width= |height= |weight={{convert|55|kg|lb|0|abbr=on}} equipped with electrical system, electric starter, carburetors, gearbox, exhaust system, oil tank and cooler |valvetrain=two intake and two exhaust valves per cylinder |supercharger= |turbocharger= |fuelsystem= |fueltype=[[Avgas#Automotive gasoline|unleaded auto fuel]] |oilsystem=dry sump with a [[trochoid pump]] |coolingsystem=free air cylinders, with oil-cooled cylinder heads |power={{convert|60|hp|kW|0|abbr=on}} at 6200 rpm for three minutes for take-off and {{convert|56|hp|kW|0|abbr=on}} at 5800 rpm continuous |specpower= |compression=11.3:1 |fuelcon= |specfuelcon= |oilcon= |power/weight=

|designer= |reduction_gear=A-type gearbox with 2.58:1 ratio, limit of 4,000kg/cm2 inertial load. The B-type gearbox with 3.47:1 ratio, limit of 6,000kg/cm2 inertial load

|general_other= |components_other= |performance_other= }}

==See also== {{aircontent  |see also= *[[Jabiru 2200]] *[[KFM 112M]] *[[Pegasus PAL 95]] *[[Rotax 912]] *[[ULPower UL260i]] |related= |similar aircraft= |lists= }}

==References== {{Reflist}}

==External links== {{commons category}} *{{Official website|http://www.hks-power.co.jp/hks_aviation/}} *[https://www.hksengines.com/ Distributor's website]

[[Category:2000s aircraft piston engines]]