- I suppose someone smarter than I decided upon it, but I fail to see why the additional 10 hp requires a trim tab. I sure have not missed having one so far, and am reluctant to install one..
-- In [email protected], iflysmo...@... wrote: > > Hey Don: The way to determine what is required is to read the type > certificate/installation instructions. Item 110 of the type certificate > states: > 110. Engines > Continental C-85-12 or -12F > Engine limits for all operations: 2575 r.p.m. (85 hp.) > (Eligible with item 1(c), 3, 4, 6, 7, or 8 propeller only). > Eligible on model 415-CD; eligible on model 415-C provided the following > are accomplished: > (a) Modifications specified under item 106 for installation of C-75 engine. > (b) Wide elevator trim tab (1-3/8 in chord) installed per Erco dwg. > 415-22031 or narrow trim tab (3/4 in. chord) installed per > Erco dwg. 415-22027 (or item 401). > Note: Conversion of continental C-75 engine to C-85 must be > accomplished in accordance with Continental Service Bulletin M47-16, > dated 6-7-48 and the oil sump dip stick recalibrated to indicate full when > > So I think it is clear that the trim tab be installed. However, it > does not have to be the wide (1-3/8 in. chord) that is required when you > convert a C model to a D model. > Lynn Nelsen > > > In a message dated 8/28/2010 10:57:57 P.M. Eastern Daylight Time, > dongen...@... writes: > > > > > > > This is very confusing to me. I have a C75 upgraded to C85. My plane came > with the extra oil tank and carb baffles NOT INSTALLED. I have been under > the impression I was not correct until I installed them (although it has > been flown for years with them in a box in the hangar. Am I reading this that > > there is no requirement to add those baffles on my 415C model? I am also of > the belief that I must add a trim tab system to fully be in compliance with > the C85 conversion (again it has flown for years that way without the trim > tab, mine is an early model that came without a trim tab) > > --- In [email protected]_ (mailto:[email protected]) > , "Kevin" <kgassert@> wrote: > > > > For the 1320 STC the aircraft must be in compliant with A-718 so > therefore no additional cooling baffles needed. > > > > Kevin1 > > > > > > > > --- In [email protected]_ > (mailto:[email protected]) , William R. Bayne <ercoguru@> wrote: > > > > > > > > > The question (as I interpret it) seems an important one inasmuch as > > > the answer essentially addresses the "airworthiness" of a given > > > Ercoupe, with or without said baffles. Always remember I'm NOT a > > > mechanic...I do have considerable engineering and legal experience > > > reading and interpreting applicable specifications necessary to the > > > supervision and inspection of installations by others. > > > > > > As previously stated here, there are NO special cooling baffles > > > involved with a 415-C, or 415-CD with a 75 hp engine. > > > > > > If one upgrades the original C-75 to C-85 spec. for operation at the > > > 1400 lb. gross wt. of the 415-D under Type Certificate 787, then the > > > extra cooling baffles around the oil tank shown in the Ercoupe Parts > > > Manual, Fig. 17, Items 13, 14 & 15 are required (as explained in the > > > description of these items on p. 23). > > > > > > Since the 1320 lb. STC was approved using data from the 415-D Model > > > under TC 787, logic would seem to dictate that flight operations at > > > the higher weight would require the extra cooling baffles that are > > > required on the 415-D when a C-85 is fitted. > > > > > > I seem to recall someone knowledgeable having previously commented > > > that there was no actual flight testing associated with the review > > > and approval of said STC. It may be that the actual wording of the > > > STC paperwork does not specifically require the installation of these > > > baffles (I don't have a copy for reference, but would appreciate a > > > copy if anyone has the time and the inclination ;<). > > > > > > It is likely demonstrable that at 1320 lbs. with "standard day" > > > conditions the extra baffles are not necessary to meet applicable > > > cooling criteria, but that's a potential financial mine field in > > > today's regulatory climate probably best not entered. > > > > > > Hope this helps, > > > > > > WRB > > > > > > -- > > > > > > > > > On Aug 27, 2010, at 16:05, Ronin Sensei wrote: > > > > > > > > > > > > > > > > > > > > > > > Can anybody direct me to, or send me, a detailed diagram and > > > > instructions for installing the cooling baffles on a 1320 lb > > > > Coupe? (or a D model, since they are the same, I understand). > > > > This is driving my A&P crazy. > > > > Any help will be appreciated. > > > > Dave Winters > > > > > >
