Sonny,Charlie et all, This seems to be headed for a highly opinionated discussion based on what the writer believes, so here are my observations based on 650 hrs of aerocarb operation (which in no way is comparable to the hundreds of thousands of hours that certified demonstrate). A much more practical shut down procedure is to run at high idle, shut off the main fuel valve, when engine stalls from fuel starvation pull the mixture. This leaves little to no fuel in the immediate line to leak either before start or after shut down.The opposite for starting is to go through your start up procedure to the point of turning on main fuel valve, then mixture full rich and hit the key. In six years the only failure for this method has been cold weather start and the solution is for preheat or primer. Some one had mentioned about the mixture sensitivity-- Yes that is a fact but not a hardship. I have never found that there was a sudden drop from rich to lean. When the aero carb is adjusted properly (also not hard) the leaning from full rich is not linear. but it is fairly constant. It can be leaned down to the point of lean of peak and from there it may only be a quarter turn til the engine shuts off. I have been doing a bunch of testing with mixture the past three months and I can fly around consistently at about 135mph -about 2600 rpm and burn about 3.4 gph and the mixture gage with no lights on. The exhaust temps top at 1390. You can not keep adjusting mixture with out also adjusting throttle as the rpm increase as the mixture leans so there is a dance being done between the two to get where you want to operate. Del - I would trade mine away but not just for anything. Sonny -selling would be criminal is the attitude that keeps america overburdened with lawyers. Let the operator be responsible.ALL MY OPINIONS!Joe Horton,Coopersburg, PA ---------- Forwarded Message ---------- From: sonny furman <sailincou...@gmail.com> To: Skyraider <oldjag...@yahoo.com>, Corvair engines for homebuilt aircraft <corvaircr...@mylist.net> Cc: Subject: Re: CorvAircraft> Aerocarb leaks.. List-Post: krnet@list.krnet.org Date: Wed, 9 Nov 2011 07:34:25 -0500
Charlie: Yes, of course my tank is set up with a manual shutoff from the cockpit and the Aerocarb mixture lever is in fact a positive fuel shutoff when pulled to full lean/stop. However, from the time you open your tank, and then the mixture to rich (for start) the fuel simply pours out the throat and onto the ground in a fairly steady stream. I was instructed by the Sonex tech person (name withheld) to start and then quickly open the mixture, which does in fact work, but that seems insane, since just a few seconds delay will allow fuel to puddle under the engine. With no float system nor a positive internal shutoff, the fuel simply is gravity fed in and then depends on engine suction to draw upward. Personally, I think it's insane. The tech claims he has about 400 hrs on his plane with it and no problems. I do hope he has lots of insurance and his heirs a good lawyer. I always liked John Denver, but don't need to imitate him. The real kicker was that I offered to send it in for evaluation, yet they actually discouraged me from doing that, and instead sent me an email copy of the manual, which I already had. With more than 5000 hrs in C-130's and other types, do they think that I don't read? In all candor, I am pissed at the way they dismissed my concerns.. At this juncture, I would not even try to resell the thing, which would be criminal. ____________________________________________________________ 60-Year-Old Mom Looks 27 Mom Reveals Free Wrinkle Trick That Has Angered Doctors! http://thirdpartyoffers.juno.com/TGL3141/4ebaa6ce104be1629269st06duc
