how do you model a huey nose?

[apollo]

HI, I am trying to model a huey fugelage but the nose is so hard to do. The revolve may not work because the nose is flat on the bottom and round on top. I sketch the profile section and save it as .sec so I can do the blend but it still comes out strange. here is what I did but not even close. I don't have the dimensions and just eyeball by my understanding.

 

[design-engine]

Try a toupe method or a ...

 

[design-engine]

Sorry I got pulled away for dinner and never came back to complete the above answer.

The toupee method for modeling a nose cone is much like the hair piece.First model a four part boundary then project a cut off the piece for the final completion of the nose cone.

this pic a little different than the 1970 helicopter you
are interested in. This image is from a surfacing workshop
I administered to older industrial designers trying to get
back in their career.
Edited by: design-engine

 

[apollo]

design-engine,


The toupee method is definitely a new method for me to learn. I have never heard ofnor done this but I'll try. thanks.

 

[dougr]

The toupee method ???


You sure like to make up your own words and terms, is this an ego thing ? Does this get you higher rates ?


This is cheap...

 

[mgnt8]

This is cheap...

Not really. I took the class and it works.It's a technique that you won't find anywhere else, so it was worth it. Before that I was like apollo, struggling to patch revolves and tri-patches together hoping to come up with something that didn't look too lame. Sign up and see for yourself.

 

[apollo]

Here is another method I used. I drew the cross section shape of the nose and revolve. It looks better than my first version...

 

[mechanical01]

I give a search to method and comes out to be.
<H3 id=siteSub>From Wikipedia, the free encyclopedia</H3>
<DIV id=contentSub>(Redirected from Toupee)</DIV>
<DIV id=jump-to-nav>Jump to: navigation, search</DIV>


A toup

 

[Jacoolo]

I suppose appollo You can achieve what You need simply by creating desired surf within Boundary Blend

beware to not get into 3 sided BB!

there is a lot of posts related to ti, so it should be usefull for You to read them down

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=34 565&KW[/url]

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=34 094&KW[/url]

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=33 776&KW[/url]

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=33 790&KW[/url]

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=36 097&KW[/url]

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=36 130&KW[/url]

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=36 055&KW[/url]

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=35 749&KW[/url]

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=37 051&KW[/url]

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=37 385&KW[/url]

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=37 502&KW[/url]

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=37 530&KW[/url]

and the longest one

[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=33 379&KW[/url]

 

[Driehaus]

Bart,
can you please explain your toupee method in a few sentences?
Kind regards
Uwe

 

[design-engine]

I feel like a cheap bald egotistical arse.

Yes... I do barrow terms to describe modeling techniques....our sport is relatively new as I teach modeling technique.No one else does... everyone else teaches the modeling tool. With me the technique is first and the tool is secondary.In this I found those attention deficit folks (or that's often how they are miss diagnosed because nothing is engaging enough) called engineers tend to be engaged at a high level and not only retain what they learn .. they actually use it.

As far as explaining the toupee method ... Doug: we are all balding at some age. (just joking you... if you are truly balding you might get more angry) A funny name to a tool keeps folks awake in the class.

Once I get access to FTP after my class today, ill upload pictures to explain. Maybe Doug or others on this board can help me come up with a cute 'one word' explanation to describe the modeling technique of creating four part boundary... projecting a part circle or ellipsoid onto that boundary and trimming it back to leave the bald spot where the toupee would go.A four part boundary that looks sorta like a revolve. Or in partial cases a four part boundary trimmed back to look like a three part boundary... only the when you apply a mesh surface too the geometry the UV lines don't look like the divergent three part boundary.


I found a hot spot on my drive to teach a class in Denver....

this image is 1/4 of what I call the toupee method. This image is not an exact example however the example is close.

Developing the nose cone would be a different task if the structure behind the nose cone is already in tooling. That would be a different technique that I have another name for but Ill spare you that.

Edited by: design-engine

 

[design-engine]

In my class today the first day of the ISDX portion of a four day surfacing workshop I asked the students to model a motorcycle helmet and use the toupee methodology.

I asked the engineers in the class to post their images they created. One engineer created a German WWII helmet and another created a storm trooper helmet all using that toupee methodology.I always tell participants to one of my classes (I cant speak for other design engine instructors) about mcadcentral.comLets hope they post their images that utilize this technique.
Edited by: design-engine

 

[Jacoolo]

there is one link left to be added to the list I created before

I searched my bookmarks a little bit and found this old post form jeff at mcadforums

scroll it down to dowload WF file

http://www.mcadforums.com/forums/viewtopic.php?t=2448

 

[dougr]

I feel like a cheap bald egotistical arse.

Yes... I do barrow terms to describe modeling techniques....our sport is relatively new as I teach modeling technique.No one else does... everyone else teaches the modeling tool. With me the technique is first and the tool is secondary.In this I found those attention deficit folks (or that's often how they are miss diagnosed because nothing is engaging enough) called engineers tend to be engaged at a high level and not only retain what they learn .. they actually use it.

As far as explaining the toupee method ... Doug: we are all balding at some age. (just joking you... if you are truly balding you might get more angry) A funny name to a tool keeps folks awake in the class.

Still got my own hair so no offense.


I agree with you, creating analogies like this are very useful in teaching by keeping people's attention and getting your point across in a clear, succinct manner.


Use of analogies has been a tried and true teaching method for centuries.


I would suggest maybe "prefacing" this stuff by saying this is a boundary blend method we like to call the toupee method (or words to that effect). That way your audience is prepped...

 

[jeff4136]

The pitfalls related to surfaces with singular or degenerate edges
have been with us as long as spline surface computations so they are
older (dating back to '50s & '60s) than most CAD users today. They,
and alternatives to their use, get a fair amount of air time on the
Rhino forum where I first learned of the concepts. The typical
alternative is called, quite appropriately, a trimmed surface.
I guess if I wanted to be more descriptive I'd call it a trimmed
capping surface. I like universally used and understandable technical
descriptions.


Conics have interesting properties that make them suitable for the
application. The attached doodle illustrates a relationship between
a planar trimmed 'paraboloid' (I think that qualifies) and elliptical
section. I tripped over it. Wonder how many other interesting goodies
those that have studied the shapes (aerospace and naval architects?)
could tell us about?
2008-08-29_020416_oloid-ish--wf2--.prt.zip

 

[Jacoolo]

I'd call it a trimmed capping surface.

I checked in google - there is nothing about that

Conics have interesting properties that make them suitable for the
application. The attached doodle illustrates a relationship between
a planar trimmed 'paraboloid' (I think that qualifies) and elliptical
section. I tripped over it. Wonder how many other interesting goodies
those that have studied the shapes (aerospace and naval architects?)
could tell us about?<a href="http://www.mcadcentral.com/proe/forum/uploads/jeff4136/2008-08-29_020416_oloid-ish--wf2--.prt.zip" target="_blank" target="_blank">
</a>

indeed, the trick with last VSS is very intresting, still confused how it is possible

Rho for last VSS sd8 = sqrt(2)-1 and Rho for front and rear VSS is 0.5, so how ...?

 

[design-engine]

in my proe surface ISDX class on Wednesday this week I had the participants model various helmets using ISDX. First I had them search Google images for a large side view of a helmet.We used the 'trimmed surface chrome dome' or more simply the toupee methodology.I like capping surface I was hoping a few of those users would upload their imagery.
Edited by: design-engine

 

[MississippiKid]

Bart --


Here are some screenshots of my StormTrooper's toupee.Not finished yet, but I'll get there (I might have bit a little more off than I can chew for my first stab at ISDX). Thanksagain forcoming in!


August

 

[[-Skint-]]

Welcome to MCAD MississippiKid

That storm trooper helmet looks awesome so far, make sure you PM me with the final modelwhen youve finished haha

I must get myself onto Design Engines course one day.... shame I dont have ISDX where I am here though unless I resort back to WF2.

 

[tobbo]

Looking good so far missisippikid .

keep us updated!!


//Tobias



Edited by: tobbo