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ragflyer
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Rragflyer replied to the thread rear spar bending load.It is in Bruhn for sure. The example though is a metal covered single braced main spar and the rear spar is unbraced and reacts the...
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Rragflyer replied to the thread rear spar bending load.Billski as usual has described the trade offs very well. 1. the wing has to react three forces: Lift (vertical), Drag (horizontal, can...
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RSimplified biplane...............................................Just one wing, and only half as many struts ! :) :) :)
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Rragflyer replied to the thread CHALLENGED? New Ultralight Design.Stability is evaluated two ways- with the stick fixed (i.e pilot holding stick fixed in one position) and stick free (i.e pilot letting...
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Rragflyer replied to the thread CHALLENGED? New Ultralight Design.12M is way to high more like a regional jet.... the Reynolds number = 777*speed(MPH)*chord(inch) where (chord position) is the pivot for...
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Rragflyer replied to the thread CHALLENGED? New Ultralight Design.To be stable the CG has to be ahead of the aerodynamic centre (AC) not the COP. So what is the difference? The COP is the point at...
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Rragflyer replied to the thread CHALLENGED? New Ultralight Design.As you can see below a rough estimate for the aft CG (stick free) is 28%. This assumes the elevator area is 50% of total tail area (I...
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Rragflyer replied to the thread CHALLENGED? New Ultralight Design.As mentioned in point 3 in myths on stability the airfoil has nothing to do with stability or aft CG limit. Your layout may well be...
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RSonja was recommended to build engine cowling first to get some experience. And this is what I was trying to do before war in Ukraine...
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Rragflyer replied to the thread T-88 Epoxy Failure.Light sanding is not a bad idea for the reasons Billski says. But you much make sure to clean the saw dust. In general though the wood...
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Rragflyer replied to the thread CHALLENGED? New Ultralight Design.Maybe it is an artifact of the drawing but if not I would make sure there is no gap between the right and left wing surface. With a gap...
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Rragflyer posted the thread Some Common Myths on Airplane Pitch Stability in Aircraft Design / Aerodynamics / New Technology.A few recent threads relating to tails and stability brought to the forefront many common misunderstandings of what actually makes an...
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Rragflyer replied to the thread T-88 Epoxy Failure.Not sure what caused the failure. I would be surprised if T88 is that sensitive to mix ratio. I have seen a lot of folks successfully...
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Rragflyer replied to the thread Question about Weights, Balance and Forces.I afraid this is not correct. It appears you are using the distance between the NP and CG as the moment arm for the tail load. At...
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Rragflyer replied to the thread Simplified biplane?.This is true for biplanes only if they are wire braced. Strut braced biplanes will be heavier than pretty much any configuration. Long...
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