Recent content by Graviman

Chusslove, Thank you for your advice, and apologies - I've been away getting a report ready... Yes, you have understood correctly. Rather than using Gausian elimination (with partial pivoting) i want to use matrix inversion. This works fine for say a 24x24 matrix but would likely struggle...

So you want to measure the characteristics of just the S809 or a partial rotor assy? I'll assume you mean assy for now. You'd be better off with the complete blade set, but could use an offset counterbalance for the centrifugal and aerodynamic forces. Trouble is what offset to use because you...

Easy, since blade is constant section, estimate the centre of mass position and treat the root forces/stresses as if the mass was concentrated at the mass centre - ie CF = Mass.Omega^2.Radius.

Kind aerospace folk, Preamble: I'm trying to write my own aerofoil vortex panel method, but have run into some difficulties. The method is designed to work in Excel, so is limited in matrix size for reliable inversion (for vortex / velocity matrix). This means that the traditional method...

OK, i think i have found what i am looking for on this site: http://www.av8n.com/how/htm/airfoils.html Consider the following line of reasoning: The airplane’s altimeter operates by measuring the pressure at the static port. The static port is oriented sideways to the airflow, at a...

Fred, i wouldn't take the pressure bubble explanation too seriously. When you transition from hover to forward flight the downwash can roll up to produce a partial vortex which is reingested (similar to vortex ring state). Basically you need to briefly raise the collective before forward inflow...

Fred, thanks for the reply. Yes, i am familiar with the use of altimeters - but, only from a pilot's perspective. I appreciate that my question appears as if from someone with no understanding. It is more that i thought this made intuitive sense to me, but now have my doubts. My confusion...

I am currently very confused about how an altimeter works. I understand that stagnation pressure is the pressure of bringing the flow to rest, and that static pressure is the pressure flowing with the fluid (air in this case). What i don't understand is that the static port is used for...

I feel humbled corresponding here. Your YouTube video is about the only leading edge physics on the internet that makes any sense! I tried to order your DVDs, but there seems to be something wrong with the PayPal setup. I have studied Maxwell, Relativity, and Quantum with the Open University...

If there was an equivalent of a Minkowski ST diagram for GR i would find visualisation much easier. As an example for (non rotating) black holes use the radial symmetry, and draw a cT / r diagram. It is very encouraging that one of the sharpest minds also believes in an economy of solutions...

George, thanks for your great wisdom and patience. It is starting to make sense to me now. I will check out amazon tonight. Mart

George, thanks for taking the time to put up this derivation. The whole thing does make much more sense to me now, and i can see how a hovering particle experiences its proper time relative to a distant observer. A falling observer agreeing on proper time from point where it fell makes sense...

I could have been clearer in what i meant here - see corrections. Please let me know if this is still wrong! I'll have a look at the books you recommend. It's been a while since i studied SR, as my daft mistakes show. I'd like to eventually gain a good understanding, but only really wish to...

Good answer Pervect. In order for my simple mind to comprehend what is happening, i have always visualised gen rel as a theory describing the rate of travel through cT of a point in space against a reference far from any matter. Time dilated near an object means it's rate goes up. The spatial...

Thanks George, i suspected it was an error in my understanding. Event horizon has been corrected to photon sphere, my memory is acting up again. So an observer trying to see if the light came out would have an infinately long wait... Mart