Battery, alternator, recoil system – ultimately there is something spinning to create electricity to drive an electrically-dependent fuel injection system.  Personally, with a high-wing aircraft, I’d like to see a purely mechanical fuel injection system fed with gravity fuel flow – do away with the redundant (electric) fuel pumps, 4 (electric) injectors.  What we have is great as long as it all has a supply of electricity; having said that I would not be without a battery in the present environment.

Jeff

 

From: Charlie England <flyrotary@lancaironline.net> Subject: Batteryless fuel injection?? Date: Mon, 3 Apr 2017 08:10:26 -0500 To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Just saw this on a 'small 4stroke engine' (aviation) group:   quote: Hi, the info from B&S for the EFI system is a bit sketchy at the moment. It is an open-loop system from Kokusan and completely different to the Delphi EFI on the 810 and the big block engines:   Vanguard has also developed a horizontal shaft small-block (627 cc) engine, with an initial application in fire and rescue equipment. Offered in a 23 gross hp rating, the engine incorporates an open-loop EFI system developed by Japan’s Kokusan Denki Co. Ltd. and has the ability to be operated with either an electric starting system using a battery or a recoil starting system. “This one is a bit unique,” Leech said. “It’s completely different than the Delphi system we use on the other engines in that it can work with a battery or without. Kokusan developed a technology that Delphi did not have.” Batteryless EFI itself is not new, as it has been a staple on small two- and four-stroke engines used on such things as off-road motorcycles and snowmobiles. The Kokusan system uses energy generated by the pull of the recoil starter to power the engine control unit (ECU), fuel pump and injectors — in that order — to start the engine. The Vanguard small-block engine with recoil start has been specified by a global manufacturer of fire equipment for a portable generator set used in fire and rescue applications   I bet that will create quite some interest in the flying  apparatus circles. If the EFI is using a MAP sensor or mass flow meter, the EFI would be fully altitude-compensating to 3,000+ meters (10,000'). Unfortunately, I haven't been able to source a parts manual yet to check what components are used in the EFI system. :unquote   These are V-twins. Might be interesting to see if there's a way to alter the 90* timing to the rotary's 180 & deliver enough fuel for a rotary using this system & larger injectors...   Google search for the FI mfgr: https://www.google.com/search?q=Kokusan&oq=Kokusan&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8#q=Kokusan+fuel+injection&*   Charlie

 

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