PT20J

Curious what people like for a penetrating oil to loosen stuck nuts and such. I've had pretty good luck with Kroil. Another mechanic friend says there was a comparison in some magazine years ago and the winner was 1:1 mix of Dexron III ATF and Stoddard solvent. Apparently, it works even better if warmed. Skip

And, that's how these folks get elected.

The mechanic at the museum, puts parts in a small container of solvent and sets it on the bench grinder frame for a few minutes which provides enough vibration for a gentle cleaning action. Skip

According to POH, the opening is 20.5” high x 17” wide.

Every so often I see a study where something like 70% of drivers think their driving is above average. I wonder if it’s the same with pilots and flying? Skip

I think that only applies if the injector is horizontal which is not the case in the IO-360 unless you mount the engine vertically as in some helicopters. From SI 1275C In normally aspirated engines where the nozzles, P/N LW­18265 (see Figure 2), are installed horizontally, particular attention must be paid to the identification marks stamped on one of the hex flats on the nozzle body. This mark is located 180° from the air bleed hole and must appear in the lower side of the nozzle to assure that the air­bleed hole is on top in order to reduce fuel bleeding from this opening just after shutdown. To ensure nozzle is correctly torqued, tighten the nozzle to 60 in.­lbs. torque. Then continue to tighten until the letter or number stamped on the hex of the nozzle body points downward. Skip

And don’t mix up the restrictors between the nozzles and don’t poke anything in the holes. 15-812_b.pdf

T is really H shaped to hold the two panels together. Not sure where to get it. The U trim Mooney used is vinyl and is fairly stiff. The U trim that Jaeger sells is pliable silicone and you will need to RTV it to the plastic panels (Bruce supplied a tube of glue with my order). It comes in gray or beige the latter being closest in color to the original plastic panels. Skip

On the early 201s, the power originates from the Cluster Gauge CB and daisy chains to the oil temp, the left and the right fuel gauges. The "send" terminal of each gauge goes to the corresponding sending unit which electrically is a variable resistance to ground. If the power is cut, the oil temp reads 0. If the wire to the sending unit shorts to ground, it reads full scale; if it opens, the gauge reads 0. If the sending unit or gauge itself is bad, anything can happen. Skip

Have you checked out Trump's guidelines (it doesn't appear that some states have)? https://www.whitehouse.gov/openingamerica/ Skip

I read an article about this a couple of weeks ago. Initially it was a bit of panic buying, but then other factors set in. There are two distinct markets for TP: Commercial and consumer. Commercial is that stuff you find at work -- thin and coarse -- made from a lot of recycled paper fiber and packaged in bulk. Consumer grade is softer, all new material and packaged for end user sale. The plants that make one kind cannot easily switch to the other. It's a low margin/high volume product and the plants run near capacity 24/7 to maximize efficiency. Along comes the stay at home orders and what happens? Demand for commercial TP plummets while demand for consumer TP increases. Supply chains are more complex than we probably ever cared to think about. Flour is currently in short supply even though there is no shortage of wheat because people staying at home are baking a lot more than usual. Skip

There’s a lot of MS secret knowledge. Some of it is even true.., Trust Anthony to know where the good stuff is hidden.

No, just another mischaracterization of real data spread by the Twitterverse. https://www.buzzfeednews.com/article/briannasacks/coronavirus-death-toll-cdc-misinformation https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/cases-in-us.html Skip

I've fixed minor warps. A lot depends on how warped it is and if the material has stretched. The glare shields are ABS which is a thermoplastic and forms easily with heat. You need to go slowly because as you apply heat, the material goes from hard to very soft quickly. You might consider buying a piece of ABS sheet from a plastic supplier and practicing before you attack the glare shield. My '78 J glare shield fit perfectly as was very easy to install and remove. My '94 J with the center hump. doesn't fit nearly as well (I've never seen one where the center part is level), is hard to get in and out and tends to crack where the material is thin from vacuum forming all the bends. I bought one of Bruce Jaegar's "Easy out" covers for my '94 that is a metal plate to cover the seam around the center tube and makes it more like the earlier Js that had a metal plate and this makes it MUCH easier to get it in and out without damaging it. Skip

By definition, your wife is right. Trust me on that. More than a C, less than a divorce Really, if your mission requires a turbo -- the 252 is a great machine. Skip

From the link in @Ibra post, the equivalent flat plate area for the P-51 is 3.80 ft2. From David Lednicer, for the Mooney it is 2.81 ft2. Remember that L/Dmax occurs where induced drag = parasite drag for any airplane. Yes, the P-51 flies faster. But at best glide speed, the two drag components are still equal. Skip

Can you back that up? I have a cookbook that my mother used during WWII that had a wartime supplement with various substitutions because food was rationed and not everything was available. During WWII fuel was rationed and I believe you had to have a special pass to travel on the airlines because fuel was scarce and many of the airline's airplanes and pilots had been pressed into service for military transport. Skip

Here are a few ideas and questions to ponder (none of which are aimed at any person on MS, they are just random musings). 1. There was a recent study by a MIT researcher and a Federal Reserve researcher that indicated that states that went back to normal activity too soon during the 1918 flu pandemic had poorer long-term economic results than states that kept restrictions longer. I don't know if this applies to the present situation or not, but it is interesting to contemplate. 2. There have been recent polls in Michigan, Pennsylvania and Florida by Fox News that all showed about the same results: 60+% supported keeping restrictions in place even if it prolonged the economic hardship and only about 25% supported the converse. 3. Even if the federal and state governments remove restrictions, will everyone go back to work? Some meat processing workers for instance are reported to have expressed concerns that conditions are unsafe. Maybe there will be the equivalent of a strike. Who knows? 4. During the "shut down", a lot of people have had to drastically alter their normal activities. Given that about 70% of the US economy depends on consumers buying stuff (a lot of which they may have recently discovered they don't really need) will "opening" result in a boom due to pent up demand, or will consumption be depressed for some time? 5. We have people that have spent their lifetimes becoming knowledgeable in their field. Why, are we so quick to discount them in favor of talk show hosts, Internet influencers and politicians that have no training in the subject at all? 6. Do we read and watch news outlets giving opposing points of view and try to make up our own minds, or do we just watch Rachel Maddow or Sean Hannity? 7. Isn't it interesting that the 2002 Nobel Prize for Economics was awarded not to an economist, but to a psychologist for his work showing how biases affect our judgement and decision making under uncertainty? Have we considered our biases lately? Skip

Actually, my attorney friends say that everyone that was an expert on constitutional law a few months ago has suddenly become an infectious disease expert.

I believe I answered your question in my original post.

I didn’t say it was a war; I said we should look at it like a war (actually that analogy came from the president, not me). All analogies break down if carried on to absurdity.

It's been a while since I read The 5th Discipline. If you liked that, there is another book you might find interesting: The Logic of Failure by Dietrich Dorner that delves into the kind of systematic errors we make attempting to manage complex systems. Cause-effect time delays and unforeseen, unintended consequences due to complexity mess us up. Skip

A few possibilities come to mind. 1. The P-51 has a wing loading of 43.4 lb/ft2 whereas the M20J has a wing loading of 16.5 lb/ft2. This means that the wing area for a Mustang is comparatively less than the wing area for a Mooney and wing area adds drag. 2. The general shape of the P-51 is relatively more aerodynamic because it is easier to form a smooth fuselage shape around a single occupant than around four. 3. Cooling drag is a significant drag contributor in piston powered airplanes. The Mustang uses a liquid cooled engine with a belly mounted radiator and inlet/outlet arrangement that takes advantage of the Meredith effect to reduce much of the cooling drag. Skip

The induced drag is a product of the generation of wingtip vortices. So, an infinite span wing would not have tips (they would be infinitely far away) so it would not have vortices and thus would not have induced drag. Obviously, an infinite span wing is an abstraction. The oft-mentioned statement that induced drag is a result of producing lift is true for a wing of finite span where vortices are unavoidable. Skip

Not peer reviewed yet https://www.medrxiv.org/content/10.1101/2020.04.14.20062463v1.full.pdf https://www.latimes.com/california/story/2020-04-20/coronavirus-serology-testing-la-county