Return-Path: Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.2b4) with ESMTP id 123467 for flyrotary@lancaironline.net; Fri, 04 Jun 2004 07:39:13 -0400 Received: from [192.168.1.103] ([68.219.38.107]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040604113842.ICHX6802.imf19aec.mail.bellsouth.net@[192.168.1.103]> for ; Fri, 4 Jun 2004 07:38:42 -0400 Message-ID: <40C05F43.5030503@bellsouth.net> Date: Fri, 04 Jun 2004 07:38:43 -0400 From: Mike Robert User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040514 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Turbo boost limits in the EC2 References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit John Slade wrote: >>Cutting fuel till the MAP comes down is the only workable solution I can >>see. >> >> >Yes, I tend to agree. Tracy - are you listening? Does this make sense to >you? >Anyone else care to comment? I'd really like to get something built into the >EC2....soon. >Regards, >John > > > > >>> >>> Again, - I'm speaking auto use - you have to be very careful using fuel cut in a boosted rotary, all it takes is a couple of hard knocks instigated by a transient lean condition to break apex seals. There's plenty of fuel coating the inside of the manifold, etc., to do this even if you shut the injectors completely off. It's a very short phenemenon but it is there. Another thing - hard fuel cuts are scary in a car, I would imagine the soiled underwear factor is quite a bit higher while flying when you hit cut. I use hard fuel cut as a rev limiter in my NA and it STILL gets my attention. That said, I believe Tracy's ECU manages spark as well as fuel. Random spark cut and/or massive retard may be the way to cut your boost in those temporary situations. -Mike