I have Googled it, but have not found official info on that.
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3 Answers
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The type certificate of the Boeing 737 provides the following table for the MAX:
answered Dec 8, 2018 at 11:20
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Wikipedia gives 45,070 kg as the MAX 8's OEW and 20,882 kg as its maximum payload.
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$\begingroup$ Thanks for the answer. In fact, I'm looking for oficial information. I did some math and the 737 max 8 has greater OEW than 737-800 NG. That might not be an error, but I have to check. Regards, Evandro $\endgroup$ Commented Dec 7, 2018 at 11:13
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$\begingroup$ @Evandrojs it would make sense with bigger, heavier engines. $\endgroup$– foootCommented Dec 7, 2018 at 18:50
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$\begingroup$ For sure, @fooot. But even so, it is expected weight reduction on airframe with more composites. $\endgroup$ Commented Dec 8, 2018 at 9:53
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1$\begingroup$ @Evandrojs the MAX didn't add a lot of new composites, besides the engines the only major structural changes were the improved winglets and area around the APU. $\endgroup$– foootCommented Dec 8, 2018 at 23:45
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$\begingroup$ Thank you, @fooot. The weight increase looks more reasonable now. $\endgroup$ Commented Dec 9, 2018 at 11:01
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I have found on Jane's database 45.065kg for OEW. And MZFW is 65.950kg. Doing the math, one get 20.885kg. So, Wikipedia info is quite good.