--- On Mon, 1/18/10, Ronald Hynes <[email protected]> wrote:
From: Ronald Hynes <[email protected]> Subject: RE: [ercoupe-tech] flying on primer? PRIMER PUMP LESSON To: "Ronin Sensei" <[email protected]> Cc: [email protected] Received: Monday, January 18, 2010, 10:07 AM Every aircraft that I have ever owned has had the primer line direct to Spider. I always use primer at start-up. Keep them free to operate always but watch for air leaks which could lean mixture . Egts and chts gauges very comforting to have. I check at pre-flight that the throttle push/pull cable to throttle arm AN3 bolt/castle nut/&SPLIT PIN are there and secure. I am a serious fanatic about CLEAN FUEL .[ with many years of testing fuel problems] Ron Hynes, Alberta , frozen Western Canada --- On Mon, 1/18/10, Ronin Sensei <[email protected]> wrote: From: Ronin Sensei <[email protected]> Subject: RE: [ercoupe-tech] flying on primer? PRIMER PUMP LESSON To: [email protected], [email protected] Received: Monday, January 18, 2010, 9:13 AM My frustrating primer pump lesson: I learned to fly 30 years ago, and have all the foundation commercial tickets. Flown all sort of planes, including jets. I my "pre-Coupe" experience, primers always shot fuel DIRECTLY INTO THE CYLINDERS (or, at least, into ONE cylinder). This was an important feature, because, that way, one could not get a carb fire from priming the engine. (Some folks just use the accelerator pump to prime the engine before starting, but that causes significant risk of fire by flooding the carb and dripping out.) When I bought my Coupe, it had the primer disconnected and crimped off. But, I wanted greater safety margin on start-up, so, at last annual, I had it re-installed. That was when I discovered that the Coupe primer does NOT bypass the carburator like every design I had ever seen previously. The Coupe primer shoots fuel into the carburator. This left me a bit non-plussed because it seemed to create a greater probably of fire on start-up. Furthermore, if there is a carb problem, it could keep me from running the engine on primer, alone. However, it DOES have the added benefit of more evenly feeding ALL the cylinders. So, I think the plane could still fly while I pump away on the primer. My guess is that the WII birds were all of the same design as my Coupe, in that respect, since they are of the same generation. Their primers probably pumped fuel into the carb. Dave Winters To: ercoupe-tech@ yahoogroups. com From: c.d.gu...@comcast. net Date: Sat, 16 Jan 2010 02:01:57 +0000 Subject: RE: [ercoupe-tech] flying on primer? Yes, this can be done. One of the pilots at our airport did this for 15-20 miles to get back to the airport. It turns out the floating cork fuel indicator was slowly disintigrating and clogging up a strainer/filter. This was not on an Ercoupe but another old plane with a similar fuel supply set-up. This is what you may call common knowledge at our small grass airstrip, where there is a lot of hangar flying during the weekends. We pass around a lot of flying knowledge just in the normal course of a day, visiting with other pilots and I'm sure this is well known with a lot of pilots. Darick ----- Original Message ----- From: jthomasterry@ lavernia. net To: "Jerry Eichenberger" <JEichenberger@ ehlawyers. com>, "Ed Burkhead" <e...@edburkhead. com>, "ety Ercoupe" <ercoupe-tech@ yahoogroups. com> Sent: Friday, January 15, 2010 4:31:29 PM GMT -05:00 US/Canada Eastern Subject: Re: SPAM-LOW: RE: [ercoupe-tech] flying on primer? Mine goes into the bottom of the spider, just above the carb. Tommy On Fri, 15 Jan 2010 16:41:51 -0500 "Jerry Eichenberger" <JEichenberger@ ehlawyers. com> wrote: >Ed - > >Forgive my ignorance, but does the normal primer plumbing >supply fuel to all >cylinders, or fewer than all? > >Jerry E. > -----Original Message----- > From: ercoupe-tech@ yahoogroups. com >[mailto:ercoupe-tech@ yahoogroups. com]On >Behalf Of Ed Burkhead > Sent: Friday, January 15, 2010 4:13 PM > To: 'ety Ercoupe' > Subject: SPAM-LOW: RE: [ercoupe-tech] flying on primer? > > > > > > Ed, would you please spell this out some (lots!) >more? I > > have never heard of flying on the primer before, and >would > > like to know how it's done. I thought the primer just >puts > > out a squirt of fuel... > > If the engine is windmilling or starving for fuel (carb >problems, fuel > line problems, clogged tank screen, clogged fuel >filter, whatever), you > need fuel to the engine. > > If it seems the engine might not be getting fuel >otherwise, you pull the > primer out and slowly push it in. I don't know how fast >you would push > it in for optimum (or acceptable) use. I just know that >if fuel > starvation is the problem, it's sometimes possible to >keep the engine > going, mostly, enough to fly level and get to a >tolerable emergency > landing spot. > > I remember a story about a WW2 fighter pilot who had >something in his > engine shot away. He flew from occupied Europe back to >England on the > primer, pumping it and pumping it. > > If there's fuel in the header tank and it can get from >the tank to the > primer intake, then the primer circuit bypasses the >rest of the fuel > system to the engine. > > Anyone who has personal experience with this, please >chime in and tell > us of your experience. > > Ed Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. Sign up now. Looking for the perfect gift? Give the gift of Flickr! __________________________________________________________________ Looking for the perfect gift? Give the gift of Flickr! http://www.flickr.com/gift/
