Recent content by Owen

Cheers for the replies. EnumaElish, you are correct. I wrote this post from memory without referring to my notes. The 2pi is indeed a divisor! SW VandeCarr, that's exactly what I was after. Thanks for the nudge in the right direction!

Thanks for the reply! I believe it should be ^(-1/2) as I'm substituting sigma with B^-1 and I'm fairly sure that 1/det(B^-1) = det(B) (although I can't remember the proof for this!). So the fraction inside the integral gets flipped on the LHS, making ^(-1/2) correct. I'm pretty happy with...

Hey all, I have an engineering background with a pretty terrible grounding in statistics and just about all maths that I can't immediately visualize as some kind of dynamic system, so forgive me if this is an obvious question! I am working through a set of derivations for a conditional...

I'll have a look over the rules later and offer any help I can, I'm off to university tomorrow though so may not reply for a few days. did you say that changing props is not allowed? that's a shame, but provided the prop you are given has enough pull (anything above about 8" pitch) the use of...

If the type of engine is limited then surely so is the power output? for a constant power output i would think that when considering the relativley small range of speeds available (with a heavy payload and so low acceleration) a greater angle of attack with as large a wing area (within...

An extra source of power is required to start a jet engine, but once it is turning it can suck in air through the front, into the compressor and out through the turbine which keeps the engine running (even when stationary). If the turbine was effectively external, that is not in the accelerated...

I read it in about 3 days, then went off and looked at things in more detail. just started re-reading "Handling the big jets"

glad i could be of some assistance I have read the book and I'm slightly more convinced about pressure causing lift now (althought i still think this pressure gradient will deflect the air well above the wing). There are numerous references in the chapters on control and stability to D.P...

Hello chris, not seen you here before. My understanding is that the relationship between pressure and velocity assumes that the total energy in the flow is constant. in the case of a jet engine somewhere between the front and the back there is a lot of energy injected into the flow. i think...

I seem to remember it working quite well, basically if you run out of lift, increase the angle of attack to an absurd amount and nail the throttle. hangs quite nicely on the prop, with plenty of authority on rubber and elevator, another advantage of higher aspect ratio, roll control with rudder...

My experience with MATLAB is very limited but by the looks of it you have defined x as a row matrix, meaning that f will also be a row matrix and so will TI since your answer is a function of TI yo uare bound to end up with a row matrix. I haven't really looked at the maths involved, what method...

I agree with large wings but if wing span is limited then an ever decreasing aspect ratio with increasing area would be a bad thing (harder to control, in roll especially, as well as a drop in efficiency). I'd say that if your looking for high lift to carry plenty of weight then a bi plane is...

Gravity has always been thought of as an attractive force between two masses. Is there any reason for this view? just because the net result of gravity is that two masses attract each other, is this really all that is going on. About an hour ago an idea hit me, and thinking about it since then...

The principal of using jet exhaust over the wings is used on the C17 cargo aircraft. the engines are mounted under the wings. but when full flap is deployed there are slots in the leading edges of the flaps specifically designed to capture the engine exhaust and produce lift over the flaps. This...

If there is an aether would it be possible to detect? and if photons have mass, is that possible to detect? It seems to me as if it is very tricky to prove whether these things are true or not and science tend not to accept things that can't be proved even if they can't be disproved. so it seems...