Thanks Ed, that explained it all very well, I appreciate that info.
--- In [email protected], "Ed Burkhead" <e...@...> wrote: > > > Don, > > Either way, you'll need to have an aerodynamic trim tab on the elevator > to get approval for the 1320 lb. gross weight STC. > > The STC requires that you change the **configuration** of the plane to > match that of the D or E and G models -- but -- without changing the > legal model of the aircraft. This can be achieved with either the > straight or "split" elevator. As the STC only changes the gross weight > up to 1320 lb., the plane stays legal for use by a Sport Pilot. > > If you keep the straight elevator, it must be limited to the 9° up > travel (the 415-C and 415-CD have 13° elevator up travel). This further > restriction of the elevator up travel increases your touchdown speed by > about 5-7 mph. (And, the aerodynamic trim tab is required.) Why the > FAA required the 9° up travel limit may take a chapter in Bill Bayne's > book when it eventually comes out (add together higher gross weight, > full power with C-85 engine, max up travel and possible misrigging by > the mechanic). But the gods of the FAA do so require. > > Note that I flew 800 hours with the 9° elevator up travel limit and felt > quite comfortable. This included a lot of operation at fields that most > people consider to be pretty short. > > If you change to the "split" elevator with the center section cut out, > the slipstream will mostly go through the cut out. This lets the plane > keep the same trim from idle to full power. Because the trim isn't > affected by power, the up travel is set to 20° to return the touchdown > speed to the 415-C and CD model's touchdown near 50 mph. > > The split elevator does NOT allow a higher gross weight in itself. It's > just an effective way to keep the low touchdown airspeed while meeting > the FAA's stability requirement at higher gross weight and full power. > > If that doesn't explain the situation adequately, let me know and I'll > try again. > > Ed > > > -----Original Message----- > > From: [email protected] > [mailto:[email protected]] On > > Behalf Of dongeneda2000 > > Sent: Tuesday, December 29, 2009 7:41 AM > > To: [email protected] > > Subject: [ercoupe-tech] 1320 lb STC > > > > I have an early 415C with the "rubberband on the yoke" type trim > adjustment, window > > style crank on the dash. > > To convert to 1320lb I must either put in the trim tab type trim > (which is expensive and > > troublesome to do and I don't want to do it), or change the elevator > to a "split type" > > from an E model. > > What is so special about the E model elevator that makes it carry more > weight? > > > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > > > > >
