flyrotary@lancaironline.net Mailing List Archive

Depends on throttle setting and mixture. I see anywhere from 1450 to 1750. Tracy Sent from my iPad On Jul 9, 2012, at 1:05 PM, "Bill Bradburry" <bbradburry@bellsouth.net> wrote: > Egts on my Renesis would be low at 1600. They consistently run in the 17s. > > Bill B > > -----Original Message----- > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On > Behalf Of Ernest Christley > Sent: Monday, July 09, 2012 2:57 PM > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: First lift off with single rotor > > Tracy wrote: >> My guess is that it is not excess pressure that is the problem. (we all > wish we had more MP available : ). >> One possibility is turbulence around the mouth of the carb, had that > happen on hod rods in my younger days. I turned the air scoop on carb > around backwards and problem went away. You running an air cleaner or > other intake plumbing that helps smooth the airflow at the entry of carb? >> Better yet, go EFI which isn't sensitive this problem! >> > > I could see this causing a blockage to airflow and the resulting mixture > going rich, but unless Richard is starting LOP, > how does that jive with the EGTs running up to 1600? > >> Tracy >> >> Sent from my iPad >> >> On Jul 9, 2012, at 10:36 AM, "Richard Sohn" <res12@fairpoint.net> wrote: >> >>> >>> -----Original Message----- From: Ernest Christley >>> Sent: Monday, July 09, 2012 11:12 AM >>> To: Rotary motors in aircraft >>> Subject: [FlyRotary] Re: First lift off with single rotor >>> >>> Richard Sohn wrote: >>>> Cleared the ground for a brief period today. As far as the airplane is >>>> concerned, everything is good. CG seems to be right on the spot. Much >>>> better as it was 12 years ago at the first flight with the SOOB. >>>> Here is the reason why it was not a flight. A few days ago when I >>>> started high speed taxi, as soon as it picked up air speed, the engine >>>> started to sputter and almost cut out totally. This was at the same RPM >>>> as at a run up, where it does not do that. With a wiggly tail dragger as >>>> the Avid is, there was no way reading enough instrument for making a >>>> preliminary analysis. I recorded the instrument panel with a GoPro at >>>> 2sec intervals. >>>> Looking at the first pictures, the answer came up right away, increasing >>>> pressure under the cowl where the intake for the engine is located. Like >>>> the EGT shot up over 1600 just before the sputtering started. Since my >>>> radiator air is going to the outside of the cowling, there was no impact >>>> on cooling. Btw cooling is really good. At an OAT of 95F, oil and water >>>> stayed at around 170F no matter what I did. >>>> >>>> For todays runs, I taped the inlet around the prop hub shut. Sure >>>> enough, the sputtering occurred at higher airspeed, and was not as >>>> total, however, EGT was still going to around 1600. >>>> >>>> The conclusion is, I have to open the cowling exits a lot. >>> I don't get it. The pressure under the cowl sounds like it would be a > good thing, because it sounds like it is enough >>> to cause the engine to lean out. If the cooling isn't a problem, why > wouldn't you just enrichen the mixture to >>> accommodate the extra air and accept the increase in power? >>> >>> Ernest, >>> >>> I am not using electronic fuel injection. My fuel system operates pretty > much like a carb with mixture control. In addition, I would not want to have > to adjust the mixture when changing the air speed. >>> Your comment certainly reflects one advantage of EFI. >>> >>> >>> Richard Sohn >>> N2071U >>> >>> http://www.fairpoint.net/~res12/home.html >>> >>> -- >>> Homepage: http://www.flyrotary.com/ >>> Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html >>> >>> -- >>> Homepage: http://www.flyrotary.com/ >>> Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html >> > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html