Scimitar F1
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Thank you @gingerbob and everyone else who contributed. A good result - it makes it easier for us to cover the full range of marks.
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Thank you for that Graham
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It is definitely the whole engine. The more I look at Gingerbob's photo the more accentuated it appears! I have heard that the RAF Museum holds the full set of Spitfire Drawings - could anyone confirm this? Will
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Thank you for that - very useful indeed and well noted. I have asked the designer for the angle of the thrust line on both and will pass that on when I get it.
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The difference is confined to the longitudinal axis/pitching plane and is matched with the line of the exhausts. I will have another look at the top cowling but looking at the render at a larger scale at first glance both are consistent with a change in the thrust line.
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To be fair I missed out a question mark as I meant to make a suggestion rather than stating fact. I don't dispute the influence of the whole wing on downwash but the late wing will have a different pattern to the early wing. Your point about the late mark wing being equally elliptical as the early wing is not correct. Can you help answer the question though?
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I wasn't making that point. Adding area at the tip makes the wing less elliptical. All I am interested in finding out is whether the differences on the scans are due to a change in the design or differences between two 80 year old airframes
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So it is less elliptical then. Happy to explain the difference between a tapering and elliptical wing.
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And a new wing with a less downwash in front of the tail - the wing shape is less eliptical so less area at the root in proportion. This is all speculation - would be good to see if there is any documentary evidence
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I think that it was intentional and I think would reduce nose down moment on the 24 - just what you would do if your new tailplanes were providing insufficient downforce and you could not increase incidence any further on them! The truth is out there. Will
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Here are the two scans. The gold is the XIV the grey the 24. We scanned the former at Pima and the latter at Duxford. Neither has been returned to flight though they will have been dismantled several times. It is too great to be a tolerance issue I think. Both match perfectly behind the firewall. If you did have to fix a trim issue between marks changing the thrust line is one of the easier options to fix it. You just need to change the length of the lower bracing bar on each engine bearer and then change the cowling panels. Does anyone have either the rigging instructions for the airframe, the parts catalogues for the XIV and 24 or the factory drawings of the bearers? Will
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Compared LiDAR scans of each and there is a distinct difference
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Has anyone else come across the thrust line of the Mk24 being a few degrees higher than a Mk XIV. I have thought that the fuselages were basically the same. Will
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Well if that means you end up with the Pilot T.11 you probably want to re-examine your approach and get more data. That or companies like DBMK that go the extra mile, LiDAR scan, get factory drawings, assemble a panel of subject matter experts to check the CAD model at several stages and 3-D print the CAD model to compare against photographs will nail subject after subject.- 275 replies
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