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gsjames  
#1 Posted : Thursday, June 26, 2014 4:58:48 PM(UTC)
gsjames

Rank: Junior Member

Joined: 4/7/2007(UTC)
Posts: 27
Location: TX

For literally YEARS now, I have been trying to make decent 'expanding radius' fillets (like those on the Supermarine Spitfire) on wing/fuselage junctions for both full-size and model airplanes. I have tried every trick that I can think of without success. So, I thought I'd throw it out to the general audience in hope that someone can show me how.

Attached is a file for a new Q-40 model race plane (AMA event #422). It is loosely based on the AR-6 "Endeavor" Formula One race plane at Reno, but the model is "cartoon scale" to meet the event requirements. It is the intent to use a 3D CNC mill to cut out the male plug from REN board and then pull molds off of that. The wing and horizontal tail plugs have already been cut but I need to finish the fuselage. The fuselage plug should have the wing saddle removed, and the fillets added.

Any thoughts or help would be appreciated.
gsjames attached the following image(s):
Tall Tail AR-6.jpg (25kb) downloaded 15 time(s).

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gsjames  
#2 Posted : Thursday, June 26, 2014 5:00:01 PM(UTC)
gsjames

Rank: Junior Member

Joined: 4/7/2007(UTC)
Posts: 27
Location: TX

The upload file function is failing. I will continue to try to upload it.
Tim Olson  
#3 Posted : Thursday, June 26, 2014 8:49:52 PM(UTC)
Tim Olson

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Joined: 2/2/2007(UTC)
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Hi Gary
Can you zip and upload?
Tim
Tim Olson
IMSI Design/Encore
kevjon  
#4 Posted : Friday, June 27, 2014 4:05:33 AM(UTC)
kevjon

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Joined: 9/30/2009(UTC)
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2 Rail Sweep ?This is the technique Marek Rys used a few years ago when he was using Rhino. Its a Hawker Hurricane who's fillet is much smaller than the Spitfire but the principle is the same.

Edited by moderator Thursday, August 28, 2014 5:21:00 PM(UTC)  | Reason: Not specified

kevjon attached the following image(s):
Hurricane_tut_6last.jpg (46kb) downloaded 12 time(s).
Hurricane_tut_10last.jpg (45kb) downloaded 10 time(s).
Hurricane_tut_11alast.jpg (67kb) downloaded 8 time(s).

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gsjames  
#5 Posted : Friday, June 27, 2014 1:52:13 PM(UTC)
gsjames

Rank: Junior Member

Joined: 4/7/2007(UTC)
Posts: 27
Location: TX

Originally Posted by: Tim Olson Go to Quoted Post
Hi Gary
Can you zip and upload?
Tim


Tim: I tried that too, and it still didn't work. Obviously I am doing something stupid. It's not a big file. I emailed it to your evo-soft address, perhaps you can figure out how to upload it.

On a personal note old friend, my wife and I are building a new house near Lake Weatherford, and it turns out that we are building just across the street from John Bruce and wife. What a small world to move, by chance, next to someone that we both worked with over 35 years ago...
gsjames  
#6 Posted : Friday, June 27, 2014 1:56:51 PM(UTC)
gsjames

Rank: Junior Member

Joined: 4/7/2007(UTC)
Posts: 27
Location: TX

Originally Posted by: kevjon Go to Quoted Post
2 Rail Sweep ?

This is the technique [URL="http://www.airart3d.com/"]Marek Rys[/URL] used a few years ago when he was using Rhino.
Its a Hawker Hurricane who's fillet is much smaller than the Spitfire but the principle is the same.


Thanks Kevjon: I've tried just about every variation of 2-rail sweep that I can think of but to no avail. Perhaps my technique is just wrong. I'll keep playing with it and try to upload it.
Tim Olson  
#7 Posted : Wednesday, July 2, 2014 12:49:15 PM(UTC)
Tim Olson

Rank: Senior Member

Joined: 2/2/2007(UTC)
Posts: 5,446
United States

Was thanked: 498 time(s) in 352 post(s)
Hi Gary
I was able to get a 0.2 (up to 0.5 in some areas) inch variable radius blend to work if I split off the trailing edge.

The convexity and end capping in that area is too complex for ACIS to blend. At the split, I assigned a variable radius value of 0.01.

Since the variable radius tool only works on solid objects, you will need to boolean the fuselage surface to the wing to get a solid object. Be sure to change direction of the surface to get the proper material direction.

I like your use of polyconics, makes a nice fuselage!

*>>the street from John Bruce and wife.
Be sure to say hi to John from me!

Tim
Tim Olson attached the following image(s):
trailingedge.jpg (21kb) downloaded 14 time(s).
leadingEdge.png (89kb) downloaded 18 time(s).

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Tim Olson
IMSI Design/Encore
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