Rob,

 

OK, here's more. 

 

Make sure that water passed through the blast tube cannot get into the regulator.  I left my regulator on the engine side of the firewall because, as you said, it would be a pain to move it.

 

Since you are probably using a Lycoming engine with a fuel distribution system that does not allow circulation of cool fuel and you will be operating in a hot climate exacerbated by global/solar warming in July, you should consider such cooling.  In the summer I have experienced engine pump cavitation whilst "lining up and waiting" for a long time, thus requiring the use of the boost pump to add enough pressure to keep the fuel in its liquid state.  Not fun if the boost pump is suffering from the same condition.  I hope your engine monitor has an idiot light for low fuel pressure - it will generally light up a few seconds before the engine stops.

 

You have checked that the battery (heavy object) mount is sufficient not to work harden from constant vibration and to keep it in place under heavy G-loads (+ and-)?  Some years ago the bracket for a permanent remote mount oil filter (heavy enough) was known to give it up after a few hundred hours. 

 

Electrics:  Well, have you considered all the important unswitched ones?  Electric turn coordinator, Air data computer, Engine Monitor, etc?

 

Scott

Scott -

 

You are right.  I forgot that the engine compartment of my tightly-cowled Lancair is probably hotter than my old Cessna.  So a cooling blast tube to the regulator area is a good idea.  I'll do that, as it would be a pain to move the regulator now (not impossible, just a pain).  Not so worried about the battery but maybe I should be.  The failure mode there is more benign (short battery life) so I may just take that as it comes.

 

I had been concerned about cooling of the Dukes pump and the gascolator, which are both on the hot side of the firewall.  I bought a cooling shroud from Lancair but it was designed for the Lancair 4 fuel pump, I think, as it didn't come close to fitting.  If anyone has a suggestion for a pre-made part I'd like to hear it.  I'm not very talented when it comes to sheet metal work.

 

Finally, I have recently seen cooling shrouds for the engine mounted mechanical fuel pump in the catalogs, but I haven't seen one on an airplane.  What do y'all think about those?  Do we need them?

 

As for electrics, I forgot to mention that my hydraulic pump has its own breaker.  When you pull the breaker it also cuts power to the Bosch relays.  And I have a separate breaker for the pitot heat.  Everything else goes through the Control Vision power distribution system.  So I think I've met your criteria of everything having either a switch or a breaker to turn it off, but nothing has both except for the pitot heat.

 

Thanks for the comments, guys!

 

- Rob Wolf