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