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  1. Nabla1

    force of jet?

    ...pipe opening into the atmosphere. Let P_0 be the static pressure of the ambient air. Then the force on the fluid within the pipe will be: F = A*P_tank - B*P_0 the acceleration of the fluid is then: a = F/m Where m = pV is the mass of fluid in the pipe (p=density, V=volume of pipe) I...
  2. Nabla1

    DIY fibre glass for conical shapes

    Hi, I've watched a few videos and read some tutorials about how to make fibre glass parts and am thinking of buying a DIY fibreglass kit. However I'm unsure as to what you would do with a conical type mold in certain cases (the nose cone of a racing car for example). I could see there being a...
  3. Nabla1

    Fuel injection - pressure of fuel.

    PedroCG: Thanks for the link and the info, theres definately some useful stuiff in there. However, I'm looking to build a smaller axial flow type engine, similar to the jetcat turbines. j79guy: Thanks also for the info, I'll definitely consider propane as a fuel, as opposed to kerosene, and...
  4. Nabla1

    Fuel injection - pressure of fuel.

    Thanks to all for the wonderful replies, it's made things alot clearer for me. One possible scenario I thought about was that the injectors were used solely for atomization (Being either on or off, or constantly on), and didn't control the flow rate, so the only control for such a system must...
  5. Nabla1

    Fuel injection - pressure of fuel.

    Thanks, so we have something like: Tank -> Valve -> Pump -> Valve -> High pressure fuel line -> Fuel injector? I'm interested in fuel systems for jet engines, where rather than a pulsed injection, the injection is continuous, and in particular I want to know how the system works for...
  6. Nabla1

    Fuel injection - pressure of fuel.

    For fuel injection systems to work, the fuel must be under pressure, so that when the injection valve is released, fuel is pushed through it. How is the fuel from the tank kept under pressure?
  7. Nabla1

    Dowload tutorials: surfaces

    Thanks for all the links, I'm looking through a few tutorials now
  8. Nabla1

    Dowload tutorials: surfaces

    Hi, is there anywhere to download free solidworks interacive tutorials, like the ones pre-loaded into the program? I'm using Sw 2007, and have the pressure plate tuorial, but it seems thatn is the only one, so how/where can I download extra tutorials? In particular, I'm looking for one on...
  9. Nabla1

    intersecting sketch planes; relations.

    Thanks, CorBlimeyLimey, convert entities is really useful, however it still doesn't solve my problem. The only way I can make the surface is by doing an extrusion with the cross-section first, and then selecting the edges as the patch boundary. But the problem is I don't want the extrusion...
  10. Nabla1

    intersecting sketch planes; relations.

    Cheers, but I don't want to move into a new part, but instead select a group of entities from a sketch (namely those splines at the front), cut them from the current sketch, and paste them into a new sketch in the same original position, on the same part. I can cut and paste the entities, and...
  11. Nabla1

    intersecting sketch planes; relations.

    Ben, thanks for taking the time to do that, but I can't open the file because it's a future version, I'm using SW2007, so yours must be 08/09? Anyway, I made a new part, similar to that, but made those splines as a sketch of their own, and it gave me what I wanted, using a filled surface, so I...
  12. Nabla1

    intersecting sketch planes; relations.

    Thanks for the replies, here is a file I threw together, to explain my situation. So far I have only sketches, no surfaces or solid parts. You can see there are a few cross-sections down the length of the shape, where I've added sketch planes (but I've only sketched the first one). I've also...
  13. Nabla1

    intersecting sketch planes; relations.

    CorBlimeyLimey: I'd rather not post the file if that's ok, it's kind of a private project. (I realise this would make things easier though) Jspisich: I don't understand the method you are describing, please can you elaborate? When I select filled surface, and try to choose either of my...
  14. Nabla1

    intersecting sketch planes; relations.

    Well, I've created the relation now, but have a new problem... I can't create a filled surface with the three related curves. (Cross section is a closed curve).
  15. Nabla1

    intersecting sketch planes; relations.

    Thanks, the two "rectangles" are side plans of an object, and I'm now trying to build some cross-sections too, giving me a 3D wireframe for the object, that I can use to make filled surfaces later. I managed to get the pierce relation working, but when I tried a filled surface, it lets me...
  16. Nabla1

    intersecting sketch planes; relations.

    Hi, I have 3 intersecting sketch planes mutually perpendicular, and on two of them I have sketches already. On the third, I'm trying to make a new sketch (a cross section), which uses points from the other two sketches as a reference/relation. Consider two rectangles perpendicular to each...
  17. Nabla1

    Inputting surface/spline functions? (SW 2007)

    Sorry to keep asking questions, but I want to know, when I have created a surface, or a set of surfaces/boundaries, then how can I make it into a solid? (i.e. 'fill' it), for example something like this: http://img528.imageshack.us/img528/880/cosxcocyff2.jpg (image was quite big to post) Thanks
  18. Nabla1

    Inputting surface/spline functions? (SW 2007)

    Thanks again. So with PI all I'm missing is the parentheses then. Got the shortcuts running, thanks for that. "Instead of using A*%T, use A*(%T-.5). I mentioned earlier in the thread that this yields a range of -A/2 to +A/2." Ok, thats simple enough. Any remedy for evaluating across something...
  19. Nabla1

    Inputting surface/spline functions? (SW 2007)

    ...entering z= (6*3.14159265)*%T worked, so I guess it must be a problem with pi.
  20. Nabla1

    Inputting surface/spline functions? (SW 2007)

    ...to be evaluated on? e.g. If I wanted a function evaluated between -5 and 5? How can I get a shortcut button for the macro? I inputted: X=0 Y= (6*PI)*%T Z=cos(%X)*cos(%Y) ...to evaluate z=cos(x)cos(y) on the plane x=0, between 0 and 6PI (3 repeats), and it didn't work. I got the message...

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