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N201MKTurbo

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N201MKTurbo last won the day on March 15

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    N201MK
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    M20J

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  1. Considering that PLEXUS is just coconut flavoured gasoline. That usually isn't recommended for plexiglass either. plexus-safety-data-sheet.pdf
  2. It is an antibacterial that is limited to 15PPM in commercial products. It's hard to imagine there is enough to hurt the plastic. It doesn't seem to hurt the plastic bottle it comes in.
  3. The football shape thing is just a conspiracy to sell more spark plugs. If you can still gap them and the side electrodes are not so thin that they could cause preignition, why replace them?
  4. I've been using spray car wax for the last 20 years. My windows still look great.
  5. https://www.marinemercantile.com/product/plexus/ These guys say they have 101 cans for $19
  6. I have the LASAR one piece belly. I would have to look it up, but it is quite a bit heavier than the aluminum panels.
  7. https://apps.dtic.mil/sti/tr/pdf/ADA566989.pdf This is from 2010 and discusses the challenges of removing polyurethane and polysulfide. The document I referenced before specifically referenced EF-5992 which are polyurethane. It says to reapply the EF-5992, which leads me to believe it was already there. If you search for any info on how to strip EFC-100 it mostly sends you back to Mooneyspace. Also, why didn’t the Mooney factory switch to EFC-100? It’s been available for quite a while.
  8. That’s half the battle. You also need to collect the PolyGone, filter the chunks and pump it at high enough pressure to spray it. And the stripper is gel like, so it wasn’t really made to spray. When they used this method on my plane, it stripped a significant amount of paint from the bottom of my wings and my landing gear. They said that was normal and they wouldn’t fix the paint. The current paradigm is to put the stripper on with a brush, let it work overnight then use a pressure washer on the sealant. This seems to be what the airlines and military do.
  9. So, with all the modern technology, they haven’t come up with a better solution. The polysulfide works well and is repairable. The airlines still use tons of the stuff. The more modern polyurethane sealer, has the Navy in a pickle. They have a bunch of planes that they cannot service because they cannot strip this stuff off the airframes. It reminds of a talk at the Aviation Maintenance Seminar about 5 years ago about fuel tank bladders. They said in WWII they designed bladders and they saved many lives. They were made from cotton reinforced rubber. In the 70, they thought they would improve the bladders by using the more modern polyurethane. After about 10 years in service, the fittings started falling off. Nowadays almost all bladders are made of the more reliable cotton reinforced rubber. FWIW, polysulfide is widely used these days. It is used to seal expansion joints in concrete and to seal windows in buildings. In most cases it is considered the superior sealant
  10. So, I’ve been one of those for the last 30 years. It has given me a great appreciation for an elegant design. We rarely redesign things that work well. There is enough work designing new things.
  11. I have a book from 1939 titled Aircraft Maintenance. Most of the charts and tables in 43-13.1B are from this book. It’s like it used this book as the foundation for it.
  12. You will never be satisfied with what you have.
  13. https://phys.org/news/2023-12-insights-metabolism-plastic-eating-bacteria.html#:~:text=Halopseudomonas bacteria live in the,for so-called polyester polyurethanes.
  14. It always amazes me that we cannot accept that the best solution has already been discovered. A lot of people must think the people in the past were just stupid. Sure, we have made great strides in electronics, but when it comes to chemistry, I think most of the great discoveries were made a century ago.
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