Stephen McIntyre on Twitter: "42/ since there's no handy analytic formula for the integral, it's easy enough just to do the calculation in steps as I did above. Bottom line is that drop altitude is extremely (and implausibly) low for impact velocities used in published OPCW report."

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Stephen McIntyre‏ @ClimateAudit 14 May 2019

32/ Sub-Team observed that mortar explanation supported by "more than one crater of very similar appearance in concrete slabs on top of nearby buildings". An example of such "very similar" crater is shown in OPCW Report Figure A.6.3; balcony crater also shown to compare.pic.twitter.com/jaz1S89dIA

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Stephen McIntyre‏ @ClimateAudit 14 May 2019

33/ Sub-Team: also supporting mortar/rocket artillery attribution was "fragmentation pattern on upper walls" (while noting unusually elevated), concrete spalling and "black scorching" (also noting fire in corner of room)pic.twitter.com/2PnEhxloNa

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Stephen McIntyre‏ @ClimateAudit 14 May 2019

34/ despite Engineering Sub-Team finding that crater "more consistent" with mortar/artillery, OPCW report stated that FFM "analysed the damage" and found that "this hypothesis is unlikely" "given the absence of primary and secondary fragmentation characteristic of an explosion"pic.twitter.com/l6zF6mKkhd

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Stephen McIntyre‏ @ClimateAudit 14 May 2019

35/ so, on Feb 27, OPCW Engineering Sub-Team said "fragmentation pattern on upper walls" supported likely attribution of crater to mortar/artillery. On Mar 1, OPCW Report stated opposite: that attribution to mortar unlikely because of "absence of fragmentation". Who to believe?pic.twitter.com/3Znwj3IxuM

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Stephen McIntyre‏ @ClimateAudit 14 May 2019

36/ Engineering Sub-Team cited "black scorching" underside of crater as support for attribution to mortar/artillry, while also noting post-crater fire in room. Skeptics earlier cited fire as evidence that crater long preceded Apr 7. OPCW weakly said that fire to "detoxify".pic.twitter.com/wSz2wqOnrN

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Stephen McIntyre‏ @ClimateAudit 14 May 2019

37/ seems odd that White Helmets would set a fire in this upstairs room on April 8 when so many dead bodies being removed from house. On April 9 afternoon, Russians inspected.

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Stephen McIntyre‏ @ClimateAudit 16 May 2019

38/ here's a strange sentence in official OPCW Report. It said that cylinder, slowed by initial impact above balcony, had enough energy to "causing a hole" in roof, "but without sufficient energy to fall through it." Huh? It takes ZERO energy to fall through hole. @Brian_Whitpic.twitter.com/4b58INzmjs

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Stephen McIntyre‏ @ClimateAudit 17 May 2019

39/ I did a quick estimate on how drag (https://www.grc.nasa.gov/WWW/K-12/rocket/termvr.html … …) might impact drop height for 50 m/s velocity as (implausibly) assumed in OPCW Report. Little impact at these speeds. Implied drop altitude (concealed by OPCW) in OPCW model is 135-140 meters. This is ludicrous.pic.twitter.com/HWjaM794z2

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Stephen McIntyre‏ @ClimateAudit 17 May 2019

40/ info on drag equation and coefficients at two NASA webpages https://www.grc.nasa.gov/WWW/K-12/rocket/termvr.html … https://www.grc.nasa.gov/WWW/K-12/rocket/shaped.html … Using air density r=1.225 kg/m3; diameter 0.35 m; drag coefficient (shape) Cd= .295, g= 9.8 m s-2, differential equation for velocity v: v' = 9.8* t - 0.01738417 *v^2

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Stephen McIntyre‏ @ClimateAudit 17 May 2019

41/ using y and x, y' = 9.8*x - 0.01738417 *y^2, Wolfram's differential equation solver yields complicated formula with first Bessel functions https://www.wolframalpha.com/input/?i=y%E2%80%99%3D+9.8*x-+.25*+y%5E2 …pic.twitter.com/fZcvkKws8M

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Stephen McIntyre‏ @ClimateAudit 17 May 2019

42/ since there's no handy analytic formula for the integral, it's easy enough just to do the calculation in steps as I did above. Bottom line is that drop altitude is extremely (and implausibly) low for impact velocities used in published OPCW report.

8:50 AM - 17 May 2019