Raptor Composite Aircraft

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wsimpso1

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Jokes man, jokes. Have you never seen Dr Strangelove? Truly great film. George C. Scott plays an Air Force General, and Peter Sellers plays multiple roles. There is talk in the war room of a Mineshaft Gap, the Big Board, led by George C Scott as shown in the USAF General's uniform...
 
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MechEngr32

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While we have been concerned about the ability of the current reduction drive to run reliably at full power (should the engine be able to make full power) and we are concerned about the variable relationship between the driving and driven sprockets, I have not seen anything that concerned me (yet) about the stiffness and strength of the prop shaft and its attachment to either the prop or to the airframe. Our big concern has been that the engine and driving sprocket are moving on its mounts independant of the driven sprocket, making the cog belt (and perhaps the sprockets too) short lived and inclined to fail.

Have you noted any particular lack of robustness or undersize in the prop shaft and its mounting that would give concern? In more typical arrangements, the prop is restrained through the drive and engine, then to the engine mounts, with flexibility of the mounts being present and accommodated with clearances to engine and prop. This is not to say that Peter does not have a problem with this, just that we have not noticed anything there yet...

Billski
I have not noticed but the thought occurred to me that if the landing gear mounts were inadequate more than likely there are other areas that could be suspect.
 

wsimpso1

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I have not noticed but the thought occurred to me that if the landing gear mounts were inadequate more than likely there are other areas that could be suspect.
I too wonder how many more places the established way of doing things has been done away with and replaced with an inadequate solution...

That could be said about any and every bit of the airplane design. Without some kind of evidence, I am reluctant to point at specific items. We do seem to have plenty to talk about already.
 

pictsidhe

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Via the wonders of youtube, numerous serious design errors have already been spotted by people with a clue. I'd bet every cent I have that there others that we haven't spotted via hand held videos...
 

BBerson

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Static aileron balancing is a routine procedure. But 100% static isn't always what the designer wants.
The interaction with the wing might require something unusual. At least that's what one designer related about his design and his test flight flutter problems at an EAA meeting a few months ago. He said he couldn't cure his flutter problem and was prepared to abandon his design, then he met with a flutter specialist and eventually got it solved. Sorry, I don't recall the details.
This designer was a graduate Aero engineer, but he said virtually everything he needed to know was self taught while building.
 
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ScaleBirdsScott

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Reading that Russian forum on the Raptor, man, those guys really know how to lay into it; and eachother. We're a rather small and cordial crowd by comparison. In any case that Wegger fellow seems to run a bit of a defense for the Raptor, and runs a rather interesting blog; am I supposed to take it that he's involved with the Raptor? And the Sportster it seems. Saw that was up for sale on Barnstormers.
 
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Voidhawk9

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Oh, I remember now what that flutter specialist recommended. It was a slight change in the aileron leading edge radius. I think he said some bondo contour changes fixed it.
This is very interesting. I presume and increased radius was employed? Perhaps something to do with tripped flow at small aileron deflections?
 
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