X-Virus-Scanned: clean according to Sophos on Logan.com From: "durabol35@yahoo.com" Received: from nm20.bullet.mail.bf1.yahoo.com ([98.139.212.179] verified) by logan.com (CommuniGate Pro SMTP 6.2c1) with ESMTPS id 9499155 for flyrotary@lancaironline.net; Thu, 23 Feb 2017 17:27:26 -0500 Received-SPF: pass receiver=logan.com; client-ip=98.139.212.179; envelope-from=durabol35@yahoo.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1487888831; bh=U1nelzKhvTPIUFKAPS112iDwrd+zTLo+oss5WDAqA6A=; h=Date:From:Reply-To:To:In-Reply-To:References:Subject:From:Subject; b=mk1H7YmydyKYR8e4k/Ny8OpZUXOu9AS5kyzjnb3uDYEkK5qjfz9cSnZwRLgYIevaQE50y6j/FqHQWpbM4ah7cARq2zxNxw694mq03e4f6aPKw9VnYRBRs/tuswsvMwNwjGI5F6hgyW6sTDvcrMLNYLJQJj3XXbWVbvgW2tU6MK0klVJtWz8xhlt5Q8M3qPkJBGGNmYmVms19Ozz8zChv+CIrfexFqDsWs+T4HgFA6YjicPo7jXRNHItSncgtDsH/KH8TOKucaQXOorbMUYZgDW9qSMVc8jWtE0gbaIDI2LpSDQ1f/rAaVFlK7zipRboHvb/JKkIQrgfML/I8JZLrUw== Received: from [98.139.170.181] by nm20.bullet.mail.bf1.yahoo.com with NNFMP; 23 Feb 2017 22:27:11 -0000 Received: from [98.139.212.250] by tm24.bullet.mail.bf1.yahoo.com with NNFMP; 23 Feb 2017 22:27:11 -0000 Received: from [127.0.0.1] by omp1059.mail.bf1.yahoo.com with NNFMP; 23 Feb 2017 22:27:11 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 111436.82629.bm@omp1059.mail.bf1.yahoo.com X-YMail-OSG: ClbGpNkVM1mlYFRw2WgNGDJ7JVXjJSU_scexnL9NmaspATwK6cAJ9D6q1abKQAU nKis1fttxipX4l5dRpgmVe.xTp27QTit07DLteXxZBj8tdl.vFxT1dhqkuWOQgNovkogVL7lDgDt NdUROBVOM2sPah4M9U2zA62dCCb3kDSOgWv3x72nVxKiCjhzKWW4J02Y2EUg2TgbXhmwnNDltDHV qM8u2TfIxQ6aU_MiW1eU_dwBU5R0uOWi43PYS6E9PoR_C6iOzJ_UurvUrpUo7UftdPjdtuhyWLkX j02nTe680KlStJ1YY_itBpo6bPP_xY_OvEg.kSL.9SEZ2DxuXK22hoyX5Q5fY6p5knq6q6HZ6wa4 E8XGI7MNkWZ_4MAIqbh8Eb5.21vwq_u11mJgNCnKwBGrYSBCRrZcN.EMwk6rxVAMbdEmRd5g.Jxs tFyspsikzlsICh97QyDGrUdrpkK2LutWcMUhNGqj0wJBGTfIN_XYZfayIJOOU4TXJZ_UI3Y2vTIA ymEcJCWRTnRtzpgVrn3ev61uiN_XLEn5A Received: from jws400063.mail.bf2.yahoo.com by sendmailws113.mail.bf1.yahoo.com; Thu, 23 Feb 2017 22:27:10 +0000; 1487888830.715 Date: Thu, 23 Feb 2017 22:26:55 +0000 (UTC) Reply-To: "durabol35@yahoo.com" To: "flyrotary@lancaironline.net" Message-ID: <1044462901.3884516.1487888815179@mail.yahoo.com> In-Reply-To: References: Subject: Boost Port Carb Efficiency MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_3884515_2064356976.1487888815177" Content-Length: 6486 ------=_Part_3884515_2064356976.1487888815177 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Dear FlyRotary Group My name is Brock and I've recentlyjoined this group. I am working on a orig= inal design Rotary PoweredWIG (Wing In Ground-Effect) vehicle that flies in= the cushion of airbetween then wing and water. Eventually I would like to = build a plane(LSA like) I can take up in the air but for now want to focus = onthis. I'm still in the research phase (for the last 15 years!) buthope to= start building shortly. I'm presently reading through RWSliterature: Magaz= ine articles, the Aviator's Guide to Mazda RotaryConversion and the Mazda P= apers and have learned a bunch. I've recently obtain a running 1986RX-7 13B rotary engine. For simplicity I= 'm considering converting tocarbs and aftermarket ignition since I'm worrie= d about getting thewiring sorted out for the stock ECU since it seems compl= icated andRWS says it is not suitable for airplane use. I've gotten theimpr= ession that a properly adjusted carbs will perform similar to EFI(that does= n't use direct injection) for spinning a propeller and RWSreports only 10% = worse mileage. I had a look at the RWS website butdidn't see the ignition s= ystem that uses the stock crank angleindicator and coils so I'm wondering i= f it is still available or asuitable replacement? I was planning to use separate carbsand fuel pumps for each rotor for redun= dancy so I can shut down onerotor and limp home in an emergency like an ign= ition or fuel systemfailure. I know this type of redundancy increases the n= umber of partsthat could potentially fail but it still seems like a good id= ea tome. The engine has a 6 port intake with the two center ports feedingbo= th rotors while the outer ports each feed one rotor. I was planningto seal = the 2 center ports and just use the outer ports but that wasbefore I read t= hat they are "boost" port and close muchlater than the center ports. Like t= he name suggests I assume that theboost ports are for high power output but= I'm worried about fuelefficiency just using the boost ports. I've read in = the "Aviator'sGuide to Mazda Rotary Conversion" the author used a 3 carb se= tupand 2 fuel pump and in normal operation all three carbs are used andfor = an emergency the engine can run on either the outer two carbs orthe center = carb. Based on this example the center ports should beused but the engine d= oes run (in an emergency) on just the outerboost ports. I suspect the cente= r ports are important or Mazdawouldn't have made the engine that way, but p= erhaps just for lowpower levels or emissions? Brock ------=_Part_3884515_2064356976.1487888815177 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit
Dear FlyRotary Group

My name is Brock and I've recently joined this group. I am working on a original design Rotary Powered WIG (Wing In Ground-Effect) vehicle that flies in the cushion of air between then wing and water. Eventually I would like to build a plane (LSA like) I can take up in the air but for now want to focus on this. I'm still in the research phase (for the last 15 years!) but hope to start building shortly. I'm presently reading through RWS literature: Magazine articles, the Aviator's Guide to Mazda Rotary Conversion and the Mazda Papers and have learned a bunch.

I've recently obtain a running 1986 RX-7 13B rotary engine. For simplicity I'm considering converting to carbs and aftermarket ignition since I'm worried about getting the wiring sorted out for the stock ECU since it seems complicated and RWS says it is not suitable for airplane use. I've gotten the impression that a properly adjusted carbs will perform similar to EFI (that doesn't use direct injection) for spinning a propeller and RWS reports only 10% worse mileage. I had a look at the RWS website but didn't see the ignition system that uses the stock crank angle indicator and coils so I'm wondering if it is still available or a suitable replacement?

I was planning to use separate carbs and fuel pumps for each rotor for redundancy so I can shut down one rotor and limp home in an emergency like an ignition or fuel system failure. I know this type of redundancy increases the number of parts that could potentially fail but it still seems like a good idea to me. The engine has a 6 port intake with the two center ports feeding both rotors while the outer ports each feed one rotor. I was planning to seal the 2 center ports and just use the outer ports but that was before I read that they are "boost" port and close much later than the center ports. Like the name suggests I assume that the boost ports are for high power output but I'm worried about fuel efficiency just using the boost ports. I've read in the "Aviator's Guide to Mazda Rotary Conversion" the author used a 3 carb setup and 2 fuel pump and in normal operation all three carbs are used and for an emergency the engine can run on either the outer two carbs or the center carb. Based on this example the center ports should be used but the engine does run (in an emergency) on just the outer boost ports. I suspect the center ports are important or Mazda wouldn't have made the engine that way, but perhaps just for low power levels or emissions?

Brock
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