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  • #1

    gilberti / Harer STC main points?

    My airplane is apart, and I might be interested in doing the Harer upgrade, or at least the parts of it that I can do now.

    Before I go off and buy the STC, can anyone give me a rundown on just what is required for the STC? I know about the small plates welded to the strut fittings. The airplane has small micarta bushings in the forward spar roots and no bushings in the rear spars. I know about the longer engine mount and cowling.

    What I don't know is what else is done during this STC to the wings, fuselage etc.

    I am asking the question here because I don't want to bother Mr. Harer or waste his time until I know I am ready to buy the official STC. Since money's tight this week and I have other costly repairs to do, I would like to see what I'm in for before committing to the money.

    Thanks, Bill
    Taylorcraft : Making Better Aviators for 75 Years... and Counting

    Bill Berle
    TF#693
    http://www.ezflaphandle.com
    http://www.grantstar.net
    N26451 (1940 BL(C)-65) 1988-90
    N47DN (Auster Autocrat) 1992-93
    N96121 (1946 BC-12D-85) 1998-99
    N29544 (1940 BL(C)-85) 2005-08
    Tags: None
  • #2
    Re: gilberti / Harer STC main points?

    Howdy VB,

    You will have to weld in a cross brace for the floor of the baggage compt. as well as the mounting tabs for the flooring. You will have to build the sides and rear of the baggage compt. I think that the installation of the "D" style windows is optional. You will have to install a grounding lug at the rear of the baggage compt. Then you will have to install a left wing tank, resize the fuel lines to 5/16 id and install a new vent system along with a mod to the fuel caps. Then, there is the electrical system. In addition to the .049 plates you will also have to modify the spar butt fittings, both front and rear.

    The whole thing is a real bear but, to me, it was worth it. If I had it to do over again, I wouldn't-I would find one already done. If you decide to go ahead and need any info don't hesitate to contact me. Be happy to help.
    Best Regards

    paul patterson
    Edmond, Ok
    N39203 Model 19 class of '45
    TF#509 EAA#720630
    Taylorcraft-The jewel of vintage airplanes

    Comment

    • #3
      Re: gilberti / Harer STC main points?

      Where does one get the 11/16" bushings for the front spars?
      -Greg

      Comment

      • #4
        Re: gilberti / Harer STC main points?

        Deleted 6/18/05
        Last edited by WLT; 06-18-2005, 04:44. Reason: ? info

        Comment

        • #5
          Re: gilberti / Harer STC main points?

          wag-aero pn 25704 price4.67 ea

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          • #6
            Re: gilberti / Harer STC main points?

            WLT, can you tell me more about the C-85-12 (with cover plates) on the short mount? I actually owned a T-crfat like that in 1998-99, and it was great. I have access to an engine like that right now.

            I would be very interested to see/hear about your approval for the non-electric 85 on the short mount. The combination of this engine, the wing mods for good measure, and the fuel lines might be just right. It would kieep the airplane in the Sport Pilot category, but make it stronger and able to perform better. I am absolutely certain that several folks would want to hear about this approval. I'll step right up and say that I would be extremely interested in a copy of the 337. Please tell us more about this project...

            Bill Berle
            Taylorcraft : Making Better Aviators for 75 Years... and Counting

            Bill Berle
            TF#693
            http://www.ezflaphandle.com
            http://www.grantstar.net
            N26451 (1940 BL(C)-65) 1988-90
            N47DN (Auster Autocrat) 1992-93
            N96121 (1946 BC-12D-85) 1998-99
            N29544 (1940 BL(C)-85) 2005-08

            Comment

            • #7
              Re: gilberti / Harer STC main points

              Deleted 6/18/05
              Last edited by WLT; 06-18-2005, 04:46.

              Comment

              • #8
                Re: gilberti / Harer STC main points?

                I have the extended baggage, C-85-8, and new bushings etc. to bring my BC-12D up to the standard of a BC-12D-85. 1280 gross land 1352 sea. My baggage compartment "walls" are made of canvass. I have the 2 wing tanks and no electrics. This plane is still eligable for sport pilot category and the increase in performance is VERY noticable. My plane weighs 812 empty giving a 468 lbs useful. What is the difference in the bushings etc. from the BC-12D-85 and the Model 19 upgrade. With all the other mods done it seems like I could easily get my gross increased to 1500. I'm going to get my seaplane rating this weekend and I plan to put my plane on floats. I doubt I'd see a performance increase by doing these mods since the engine upgrade is already done...but the increased useful would be nice for packing gear into camp. At 1500# gross and 812 empty weight I'd have a useful load of 688#! Is the non-electric, short mount C-85-8 eligable under the gilberti/Harer STC?

                Comment

                • #9
                  Re: gilberti / Harer STC main points?

                  Deleted 6/18/05
                  Last edited by WLT; 06-18-2005, 04:47.

                  Comment

                  • #10
                    Re: gilberti / Harer STC main points?

                    Check the wording of the STC! I believe in order to get the 1500 lb gross weight you have to use the long engine mount. With the short mount I believe you are limited to only 1280 lbs.
                    Richard Pearson
                    N43381
                    Fort Worth, Texas

                    Comment

                    • #11
                      Re: gilberti / Harer STC main points?

                      Richard is correct. It may help to think C of G...

                      the extended baggage compartment permits more weight further aft. So there must be something forward of the cg countering this rearward effect. Of course, it is the engine on a longer mount.

                      The Taylorcraft, like most aeroplanes, is verysucceptible to beyond-aft-cg situations. So if there is a short-mount Taylorcraft with extended baggage compartment, be careful.

                      So:
                      short mount = 1280 lb
                      long mount = 1500 lb
                      Very loosely, anyway.

                      It is not permissable to go to 1500lb with the short mount.

                      Of course, the structural considerations need to be allowed for too.

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