Builders,
Dan and Tracy Sheradin arrived at 9pm Friday, after a long drive from NC. They were here to have some fun, and put a great effort into the Stromberg Shootout. Below are a few pictures of a long Saturday of testing which ran from 7:30am until midnight, with only a few short breaks.
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Tracy does a ‘Vanna White’ style presentation of our test carb line up. We ran them all today. That is a lot of carb, airbox, fuel line and throttle linkage changes on a hot motor in a single day. We also paused to do compression tests and adjustments on my 3,000cc Corvair to insure we were running controlled tests.
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Above the engine running in front of my house with the first carb. The timing light is giving the RPM. Large round gauge is manifold pressure.
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Ceteris paribus is a term often used in economics. It means, “with other conditions remaining the same.” It’s important in scientific testing, where a good test only includes one variable, to measure the effect of that variable.
I applaud the effort to make sure that ceteris paribus is in effect. It makes sure that the results are as valid as possible.
Good stuff William. Thank you
Jeff
Hey ww give my dad a call at dgsupply when you find the best setup for strombergs. We get them occasionally and overhaul them with what we think should work and get no feedback. I know that stromberg guy knows his stuff but he is not afraid to lay blame to others even if he is wrong. That’s just our experience. But other than that he is what I would call a specialist.
Scott, thanks for the letter. I think you are right, engine specific first had testing is very educational compared to knowledge which is generally true about Strombergs. I appreciate that you and your Dad have always had a positive outlook on fine tuning our application.
Although I have a lot of time in Graces Taylorcraft with its Stromberg, I have not personally owned a Corvair powered plane with a Stromberg in more than 15 years, and all of our engine test runs have been with a MA-3. The testing was a very in-depth refresher on the carb. Dan and Tracy were a huge help. We actually changed carbs about 15 times, pulling them off to change small variables.
Bob was certain that the Jetting for the C-90-14F was going to work best, and I’m sure it does on a C-90, but out tests said otherwise, by a wide margin, it was an educated guess, but testing is the only measure which counts.
Please tell your Dad I’ll call him and give him a full rundown this week.
Thank you William for allowing us to come and assist with this process. As a wife and future passenger in an aircraft with a Stromberg carb, I am much more at ease knowing that it will run properly as expected. Thank you for caring about an aspect of an airplane in which you have no control regarding quality of workmanship. That is why we chose a Corvair as our engine of choice.