|
|
Turbo Prop
About Truespace Archives
These pages are a copy of the official truespace forums prior to their removal somewhere around 2011.
They are retained here for archive purposes only.
Post by Steinie // Mar 12, 2007, 7:23am
|
Steinie
Total Posts: 3667
|
1) How do I make this shape using TS? This will end up being a blade in a turbo prop.
2) Are there any TS tutorials on making a plane propeller? (or Boat propeller) |
Post by Norm // Mar 12, 2007, 7:33am
|
Norm
Total Posts: 862
|
Part of answer would be the Macro Sweep tool, which allows you to sweep in degrees and also has a helix setting, which could be helpful in attaining such a shape. |
Post by Bobbins // Mar 12, 2007, 7:57am
|
Bobbins
Total Posts: 506
|
I did this prop with the sweep tool. Started with a cube, a little point editing, then selected two opposite faces of the cube and swept, adjusted the scaling and rotation of the swept face then kept sweeping. Once finished, added a layer or two of SDS and this is the result. Only problem was that I accidentially made it a pusher and not a tractor prop, but nobody seems to have noticed. |
Post by Chester Desmond // Mar 12, 2007, 8:19am
|
Chester Desmond
Total Posts: 323
|
I always thought to myself.. that plane is going to fly backwards. ;)
I really like the look of that wireframe image. Is that realtime in TS7? |
Post by Bobbins // Mar 12, 2007, 10:00am
|
Bobbins
Total Posts: 506
|
I really like the look of that wireframe image. Is that realtime in TS7?
No, tS6.x LightWorks rendering. Two images, one wireframe and one regular overlayed on each other. |
Post by ProfessorKhaos // Mar 13, 2007, 4:46am
|
ProfessorKhaos
Total Posts: 622
|
An interesting topic... and one that could be either quite simple or quite complex depending on the effort you want to put into it.
A prop is basically an airfoil. The root of the prop (near the hub) is generally angled more steeply than the tip and has a thicker profile. As you near the tip, the angle flattens and the height of the airfoil flatten markedly.
The real world reason for this has to do with the fact that the tip is moving faster than the root so the tip is able to obtain the same "lift" (forward direction) at a shallower angle with a thinner airfoil. This is important for engine loading and for efficiency.
Rounded over propeller tips are the most efficient design for the same reason that rounded over (technically elliptical) spitfire wings had the best wing performance, only being sacrificed later due to construction difficulties.
Most modern prop aircraft also have a mechanism to control pitch of the blades overall. This serves the same role as a transmission in an automobile but has the advantage of smooth continuous "shifting"
Boat propellers are likely similar though I think their design varies greatly with application. Many are designed to reduce "cavitation" effects which occurs when water is placed under enough suction to create a vaccuum that "boils" the water for a few seconds, resulting in bubbles. Think this occurs mostly at the propeller tips...
I'd think 3dpdk would be a great guy to talk to on the subject on both accounts, being an airplane fanatic and a professional ship captain.
Steine, I know you can model quite well so technique might follow from a physical example. Personally, I'd go to the local hobby store and buy a wooden R/C aircraft prop. These are surprisingly similar to their full size counterparts though with just 2 blades. Only real difference with variable pitch blades is that the root ultimately gets joined into a cylinder shape so that the blades can be rotated in pitch.
P.K. |
Post by Steinie // Mar 13, 2007, 7:11am
|
Steinie
Total Posts: 3667
|
Thanks for the replies everyone!
I use tS at different levels and most of my work has a Cartoon look. The questions I asked here are for that purpose. However I also want to learn how to model objects properly for educational purposes which I store away in my brain for future use. I don't recall any tutorial done on this and it would be quite useful for users developing their own modeling skills.
ProfessorKhaos, You are most kind in reference to MY modeling skills. Did you see the scene in the Monty Python movie "Life of Brian" where the two peasants are on their hands and knees in a meadow modeling cow manure?......:rolleyes: |
Post by jamesmc // Mar 13, 2007, 7:27am
|
jamesmc
Total Posts: 2566
|
I can make the whirring sound of a propeller with one hand cupped over...
er nevermind... :o |
Post by prodigy // Mar 13, 2007, 8:32am
|
prodigy
Total Posts: 3029
|
Hi Steinie, here is a simple video "tutorial" to show how you can make that shape.. as you can see is fast and easy to do... Sure, if you need to make a more detailed fan maybe you can spend more time on that.. :)
Hope that helps, and sorry for the video quality..:rolleyes:
Best Regards. |
Post by Steinie // Mar 13, 2007, 9:33am
|
Steinie
Total Posts: 3667
|
Thanks Prodigy! You made it look easy. I'll work on this when I get home.:) |
Post by ProfessorKhaos // Mar 17, 2007, 4:45am
|
ProfessorKhaos
Total Posts: 622
|
Just caught up on my thread reading. All I can say is wow Prodigy! No wonder you can get so much done in the speed model contests. :)
A nice quick tutorial too! |
|
