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That's actually exactly what I said. A multi weight, say a 15W-50 has a base viscosity of 15 at 0C and a viscosity of 50 at 100C. Above 100C a multi weight 15W-50 does not lose viscosity as quickly as a straight 50 weight

Cam and tappet spalling is the result of subsurface cracks that develop as a result of extreme loading under pressure. Corrosion can lead to spalling but corrosion is not the principle cause — plastic deformation of the lifter and cam surfaces under pressure is the cause A key factor in...

I've read all of part 25. Nowhere is a linearity requirement for control forces specified. So, no, you've not. They feel the same. There is no artificial feel in the A320 control. There are a set of centering springs and dampers, that's it, and they behave identically irrespective of the...

Cite the relevant sections of Part 25, please. On the 737, control forces, particularly elevator control forces, are created by the elevator feel computer. Not the stabilizer trim. Also please cite the relevant sections of part 25 that require to make the forces linear. I'm also curious how...

Reference, please. The specific section of part 25 that goes to your statement would be fine. Reference, please. In particular that MCAS "[increases] the control forces." I thought it drove the stabilizer jackscrew through the electric trim motor. Yet not every plane with underwing...

Now you're putting words in my mouth. I explicitly said that pilots were not only unaware of what to do in the case of an MCAS failure (i.e. untrained), they were unaware that MCAS even existed. Not even Boeing's own test pilots knew that MCAS existed.

You've just described a 737 MAX with MCAS inoperative. Your objection reminds me of someone someone said either here or elsewhere. They took exception that I said that "[stability] was aviation canon since the days of the Wright brothers at Kitty Hawk." Their objection was that I should have...

Now we're debating whether or not a 737 MAX should require a three-person crew.

First, my understanding of the issue -- gleaned both from public reports as well as private correspondence is this: 1. The mass of the engines (the LEAP engines are about 1500 pounds heavier, per engine, than the CFM56s they replaced) coupled with their location forward of the longitudinal...

Unfortunately, I think that's a large reason why there are 300+ bodies at the bottom of the ocean and scattered across the desert.

Hi, Gregory Travis here. A friend forwarded a link to this discussion. First, Ron it's fantastic to see you here. I am looking at my copy of Kitplane Construction on my bookshelf right now :) Second, I'd be happy to discuss the points in my article here. I am not perfect, by a long shot...