MikeOH Posted March 25, 2024 Report Posted March 25, 2024 4 hours ago, N201MKTurbo said: You will never be satisfied with what you have. Thankfully, neither are scientists/inventors/entrepreneurs who advance the state-of-the-art in all fields. Quote
N201MKTurbo Posted March 25, 2024 Report Posted March 25, 2024 47 minutes ago, MikeOH said: Thankfully, neither are scientists/inventors/entrepreneurs who advance the state-of-the-art in all fields. 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. Quote
MikeOH Posted March 25, 2024 Report Posted March 25, 2024 1 minute ago, N201MKTurbo said: 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. Hmm, so our polysulfide sealant is an 'elegant design and 'works well'...WOW! All the previous threads over the years regarding the stuff sure seem to indicate otherwise. Glad to hear no work needs to be done designing a 'new thing' to replace it Quote
N201MKTurbo Posted March 25, 2024 Report Posted March 25, 2024 Just now, MikeOH said: Hmm, so our polysulfide sealant is an 'elegant design and 'works well'...WOW! All the previous threads over the years regarding the stuff sure seem to indicate otherwise. Glad to hear no work needs to be done designing a 'new thing' to replace it 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 Quote
MikeOH Posted March 25, 2024 Report Posted March 25, 2024 10 minutes ago, N201MKTurbo said: 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. Do you have a reference for this? Your previous cite for the NAVAIR E6B bid doesn't seem to be related to polyurethane: "Interested parties in seeking NAVAIR approval of the medium pressure stripping process shall provide procedures and process specification, instructions and pre/post inspection checklist for the removal of polysulfide or polythioether integral fuel tank sealants for review" Quote
N201MKTurbo Posted March 25, 2024 Report Posted March 25, 2024 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. 1 Quote
Pinecone Posted March 25, 2024 Report Posted March 25, 2024 On 3/23/2024 at 3:41 PM, LANCECASPER said: Plus he is implying that polysulfide is being used to seal the tanks, when in reality it's what Weep No More and Wet-Wingologists use to remove sealant. https://www.rpm-technology.com/wp-content/uploads/2016/12/PolyGone-310-AG-Inst-v2.pdf Other than all of that misinformation, i agree that prep being paramount is true on this and any other tedious job. You need re-read that link you posted. The product is PolyGone and used to REMOVE ploy sulfide sealant. Polysulfide IS the sealant used. 1 Quote
LANCECASPER Posted March 25, 2024 Report Posted March 25, 2024 10 minutes ago, Pinecone said: You need re-read that link you posted. The product is PolyGone and used to REMOVE ploy sulfide sealant. Polysulfide IS the sealant used. Read through the posts. I already acknowledged that Quote
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