Sender: "Marvin Kaye" <marv@lancaironline.net>
To: lml@lancaironline.net
Date: Mon, 04 Oct 2004 13:26:36 -0400
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From: "David Lowry" <dave@edt.com>
References: <list-451964@logan.com>
Subject: Re: [LML] Ada cooling
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All,
 I will give a brief summary of the cooling seminar:
 1) "The Devil is in the details."
 2) Basically you need to get cooling air to every cooling fin on your 
 cylinders. 
 a) The Lancair baffling leaves the bottom fins uncovered on the
 front of the two front cylinders and the back of the back two. 
 b) These cooling ducts should be completely boxed (like the 
 Lancair baffles for the inter cylinder baffles.
 c) The hole cut behind the alternator will do better with 
 an awning to divert more air.
 3) Exhaust components in the turbo get hot. The cylinders
 above those components will get hot from this radiated heat.
 Stainless steel shields can be used to protect this. George et al
 used parts from a turbo Cessna twin.
 4) The intercoolers in the back steal air from the cylinders in the
 back. George built an airdam between the intercooler and the
 cylinder that goes all the way up to and seals to the top cowl.
 This increases the pressure on the back cylinder.
 5) Don't get anal about every little hole and crack such
 that maintenance is difficult or impossible. For example,
 cut way back on the RTV.
 6) The Cirrus SR22 addresses all these issues but 2c.

 Other info:
 Prism:
 1) George has quit predicting when it will be done. They
 will make available as experimental before the certified
 version but want the exp and cert versions to be the same.
 2) The current version will not fit a top draft TCM. They
 will have a version that will.
 3) It looks much simpler than a TCM FADEC.
 4) It will use special (expensive) top plugs with pressure
 sensors in them.
 5) Millennium will make cylinders with pressure sensor
 holes so regular plugs can be used.
 6) Cost will be competitive with TCM FADEC.
 
 Plenum:
 George does not think they add much and the maintenance
 and inspection issues. If you do make a plenum make it
 as large as possible. 

 Other projects:
 They have a lot of projects going on including building 
 and shipping of existing products, saving the bonanza world, etc.

 "The devil is in the details"

 Thanks to George, Walter and all for great information.

 I have some pictures. If others don't show up I will post in a day or so.
 

 David Lowry