Recent content by Aero Stud

There are no fundumental problems with VASIMR. The main problem is simply power. For example, just the 10 N thrust version with an Isp as low as 1,000 seconds would require over 50 KW, which is something above 11,000 square feet of solar panels. At this point, unless a nuclear reactor is used...

LOL are you studying engineering or psychology ? lol Those are the rules - what's the point of just telling you the answer, the shear centre is where the moment is zero so use that for every section and it's moment and you can find it. I studied this stuff a year ago, I think maybe a tiny bit...

You can also use light plastic or wood beams and nylon, like some moden airplanes or.. don't know the english word - the white soft stuff that food containers and water jars for single use are made of (calcar - if that means something in English lol ). You also need a skirt. About the egnine -...

And so far you have done... ? If you know how to solve one of these you know how to solve them all as I remember.

I didn't mean that, I meant I want to save weight as much as possible and what I found looks promisng. Thanks. :smile:

That's exactly what I want to avoid. I'm supposed to be an aerospace engineer dealing with stuff that's supposed to fly not an armoured tank engineer... :wink:

Thank you again Q_Goest. :) I looked at Grafoil, but it seems to mostly be used for O-rings. Anyway, many of these specifications are so specific that it's difficult to understand what exactly you're supposed to use these materials for, unless you have a pic. Anyway, I think I found...

Thanks again guys. :smile:

Hello people :smile: Again I need some help...:shy: I'm looking for a type of cloth that can be used to seal a gas at up to 700 degrees C (about 1200 F) and a pressure difference of up to 1 atmosphere. Just to explain a bit more, I want to seal gas between two sections of a jet engine...

Thanks guys ! :smile: I found something on GlobalSpec too but those were just statistics - much better too see exactly what you need. I managed to shorten then distance so the moment is now right in the range I need. Thanks again. :smile:

You're doing a Major degree and you're asking this ? Strange... http://en.wikipedia.org/wiki/Bending http://en.wikipedia.org/wiki/Shear_stress http://en.wikipedia.org/wiki/Beam_%28structure%29

Hi people, I am trying to find the smallest possible rotary actuators (I think the electrical ones are the smallest in the category though maybe there are also pietzoelectic rotary actuators with high torque for small angles) for the 1-10 Nm (8 - 86 inch-lbf) range. I don't need them to...

Yes, I think that book should have it, if you can find it in a library. If you just want the number, you could use Solid Works or Solid Edge that can do this automaticly.

I see what you mean. However I see a problem here, same as with most ideas of this type including mine - in that when you turn this sleeve the axial length has to vary radialy. So then something has to be done with the excess material and the axial crossection changes and all that unwanted...

ok.. you mean 3 axial actuators - along the main axis on the sides of the nozzle ? My idea is to save some material and leave anough to open a sleeve of equal diameter to the solid exit nozzle, up to 90 degrees or less, by turning a circular frame that the sleeve section is attached to and at...