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MOOSE AIR LLC'S WEB SITE
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Date: 3-16-2006
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Number of Hours: 140.00
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Manual Reference: CHAP 9
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Brief Description: FUSELAGE EXT. 14"
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The fuselage extension is a two-part log entry. This part, credited to Bob, is basically the analysis of the extension from an aerodynamic, loads, and flight characteristics point of view. It's been the subject of some controversy from Daryl Murphy[see the website], but his viewpoint came from a misapprehension of what we are doing..If there is room in here, we will install the complete discussion. Otherwise, it will be the subject of a separate report.
http://www.murphyair.com/DarrylNotes.html
Yes, a very interesting note from Darryl. Of course he doesn't like the idea of anyone messing with his design, both as a matter of pride and more importantly, responsibility, since if anything happens to any of the aircraft no matter how they are modified, it will reflect on him.
But now to the specifics. First, weight and balance. MARK, I'm interested in how much you think the stretch adds to structural weight. You'd have a much better idea than I would. Of course he's assuming a 20 inch stretch back at the tail cone. That would be much more of a problem than what we did. If you can give me the weight, I have the moment arm, and I can calculate the effect on empty weight CG. I already calculated effective increase in tail moment arm as being 6.35%.
He mentions the tail wheel being 3 1/2 inches lower than the original design. Of course by my measurements in the shop, there isn't any measurable difference in the 9.5° fuselage angle, and the effect of wheel sizes and stinger angle will have a much greater effect. His comment on an aggressive rotation at takeoff needs to be taken into account. Since the tail wheel is 14 inches farther after, it might be a concern on an aggressive rotation. The only way to check this out is through flight test. My estimate is that the wing will stall at about the 15 to 17° pitch attitude. This gives five to seven degrees in deck angle between three point attitude and stall. However, no one is going to rotate to the stall on takeoff, and it's a dynamic situation, whe
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