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  • #31
    To accompany Scott's welcome reference to Stromberg operation in #22 here's a similar brief on Marvel carburetors.

    http://www.kellyaerospace.com/articl...essory_AMT.pdf

    Gary
    N36007 1941 BF12-65 STC'd as BC12D-4-85

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    • #32
      Hey Tim,

      How are you cruising at 120mph with that climb prop?

      Only asking because I would love to make mine go faster.

      My F-19 cruises at about 90mph (gps) at 2450RPM with the cruise prop.


      Also, finally installed the fuel valves. Much better. Thanks!

      Originally posted by astjp2 View Post

      Get the longest and flattest propeller you can get, I ran a 7443 with a o-200, I started with a a 7446, I gained a lot of climb and it can cruise 105 kias with the last prop I had. I am not sure what my current one will do as a swapped from a Sensenich to a McCauley. The marvel carb is also great because of having a mixture.

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      • #33
        RPM, I am running 2700-2750 and it was a sensenich, I have not tried the McCauley yet. The cruise prop would not turn RPM's, it dropped off at about 2600 with the 7446, the repitch made it a new airplane. The prewar airplanes are quite a bit faster for some reason which I believe is due to the angle of incidence, and mine has covered gear legs and a spinner which helps. Tim
        N29787
        '41 BC12-65

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        • #34
          Originally posted by astjp2 View Post
          RPM, I am running 2700-2750 and it was a sensenich, I have not tried the McCauley yet. The cruise prop would not turn RPM's, it dropped off at about 2600 with the 7446, the repitch made it a new airplane. The prewar airplanes are quite a bit faster for some reason which I believe is due to the angle of incidence, and mine has covered gear legs and a spinner which helps. Tim
          What is your fuel GPH like cruising around at 2750? Is it a stock O-200?

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          • #35
            6.5 gph or so
            N29787
            '41 BC12-65

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            • #36
              Originally posted by astjp2 View Post
              6.5 gph or so
              Okay. Any other downside to running around at redline all the time?

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              • #37
                Kerbs
                That is one nice looking T-craft, I did the same conversion but added the starter after a near miss propping on ski's.
                i think it makes a great plane even better.
                Are those 8.5x6 tires?
                Did you happen to note the oil temperature delta to ambient?

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                • #38
                  Originally posted by Taylorcrafty View Post

                  Okay. Any other downside to running around at redline all the time?
                  I never said I flew that way all the time, but the airplane is capable, I flew out of Delta Junction a lot for several years and never had any problems. I would fly to chicken; circle, central, tok , Palmer, fai, anc, Merril, all over and if the weather was good, it I would fly 10 hours on a Saturday because I enjoyed it. I did have a weird vibe at 2300 with the old prop so I either had to cruise at 2150 or 2450 because I did not have a spinner to do a dynamic balance at the time. I have yet to fly the new McCauley. I was able to get a new Sensenich if I want to go ack to that one. Tim
                  N29787
                  '41 BC12-65

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                  • #39
                    Originally posted by TC747paul View Post
                    Kerbs
                    That is one nice looking T-craft, I did the same conversion but added the starter after a near miss propping on ski's.
                    i think it makes a great plane even better.
                    Are those 8.5x6 tires?
                    Did you happen to note the oil temperature delta to ambient?
                    Thanks, I appreciate it. The C85 makes it so much more fun, and it was a lot of fun to begin with. Yes, they are the Dresser 22" 8.50s. I really like them and they have held up well so far.

                    I did not make not of the oil temp to ambient. I have noticed that the oil temp is coming up a little higher than the 65 which I like, my 65 barely ever warmed up in the winter.
                    Stu

                    '46 BC12D
                    Jefferson County (0S9)

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                    • #40
                      I am considering the same upgrade , but with a battery starter and no alternator.
                      what king of mags did you use and how was the fit. If you could send a picture that would be great. Where are you located at?

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                      • #41
                        Originally posted by Laz View Post
                        I am considering the same upgrade , but with a battery starter and no alternator.
                        what king of mags did you use and how was the fit. If you could send a picture that would be great. Where are you located at?
                        I went with Bendix mags. There are a number of pictures under the thread on carb ice continued that I posted recently or let me know if you want something else. I have a spreadsheet of everything that went on it along with the cost. PM me if you would like me to send it.
                        Stu

                        '46 BC12D
                        Jefferson County (0S9)

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                        • #42
                          Originally posted by Laz View Post
                          I am considering the same upgrade , but with a battery starter and no alternator.
                          what king of mags did you use and how was the fit. If you could send a picture that would be great. Where are you located at?
                          We have a Pitts S1S at my airfield that used to have battery starter, no alternator (or generator) for weight reduction.
                          It makes sense...you have the advantage of battery start, without the complexity & weight of alternators, voltage regulators etc.

                          Just one impulse mag, any brand, makes the whole process easier.

                          Plus, an S1S is easy to hand-swing if the battery gets cold, or flat.

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                          • #43
                            Dual impulse slicks.
                            N29787
                            '41 BC12-65

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                            • #44
                              What is the core charge in addition to the $982.80 for the Marvel/Tempest? Suppose they will give me a deal on two of them? I've got two Strombergs.............

                              Cheers,

                              Jon
                              "Captain Jon" Timlin
                              '46 BC12-D N94952 Traci T-Craft
                              '46 BC12-D N96301 Tami T-Craft (undergoing restoration)
                              '51 Model 19 N6629N Terri T-Craft (undergoing restoration)

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                              • #45
                                For what carb? They list the core on spruce from what i remember it is a foot note
                                N29787
                                '41 BC12-65

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