giant fractal pecan pie

giant fractal pecan pie
for thanksgiving 2k4 we opted to construct a very large pie.

based on a prototype the previous year we were aware of a fundamental limitation of large pies, namely the crust to filling ratio. for traditional circular pies of radius R, the amount of filling scales as R2 while the crust only scales linearly so as the pie grows larger, the flaky crust is completely dominated by the creamy filling.

our solution was to construct a pie pan in the shape of a koch snowflake (whose perimter obeys completely different scaling laws), fill it with delicious pecan pie and bake in a custom backyard oven.
 
Remove these adsRemove these ads by Signing Up
 

Step 1Layout design

layout design
the layout was determined by two constraints:

1. the finished product had to fit in the transport vehicle. this gave an maximum outside diameter of around 50 inches, conveniently close to the 24x48 inch sheet metal available at the local hardware store. this set the initial side length L of the largest triangle.

2. we only had access to crust of a finite constant thickness so the smallest triangle had to contain some reasonable amount of filling. (L/3)niter > minimum acceptable edge length suggested that we go no deeper
than 4 iterations.

A template covering (1/12) of the entire perimiter made reasonably quick work of laying out the pie pan edge.
« Previous StepDownload PDFView All StepsNext Step »
41 comments
1-40 of 41next »
Nov 24, 2008. 11:35 AMcanida says:
This Instructable was featured on NPR's Here & Now on November 24, 2008!
Nov 30, 2011. 8:40 PMvarel-bundock says:
Best paragraph I've read in a while. Found my way through: http://felixsalmon.tumblr.com/post/13577123646/the-thing-they-dont-tell-you-about-fractals-is
Oct 22, 2011. 1:37 PMjusbeachy says:
That's just totally AWSOME !!!!
Thanks so much for sharing it all, the PIE PAN, the OVEN ,
& most of all THE PIE !!! Sincerely, Jus Beachy
Jul 6, 2006. 4:09 PMferrocene says:
Beautiful pie! Granted, you've achieved a pie with a more crustacous scaling law, but how do you serve it in human-sized pieces, assuring each diner a similar quantity of crust? The problem would be easy to fix in a purely mathematical sense, in the same way that a sphere can be dissected and reassembled into two spheres. The trick doesn't work for real representations of spheres, and sadly, probably wouldn't work for real pies, either. :( Maybe a Sierpinski gasket-shaped pie pan?
Apr 14, 2011. 7:49 PMmdougherty1 says:
Sierpinski gasket pie...

Maybe a Menger sponge cake (or Menger spongecake, w/e)

Of course it would soak up a lot of rum (infinite surface area) but would not be very filling (with zero volume)
Nov 24, 2010. 11:13 AMEnigmaMax says:
dear god... infinite pie...
Jul 2, 2010. 3:07 PMdarthpotato1 says:
i understand what you are trying to do with the whole "filling dominates crust" thing, but wouldnt the midlle be dominated? i guess you could solve this by making the center a bit thicker than the edges. Please reply, as i would like to know what you think about it. Thanks, -Darthpotato
Dec 20, 2009. 11:17 PMrxtrekker says:
i bow down to you.  totally incredible!!!!!!
Dec 20, 2009. 12:13 PMDaddydano says:
You guys are incredible. Awesome mind power combines with the love of good food. I am going to connect this up to my face book. You guys deserve others to see the true powers of Geeks in action (I meant this in a totally nice way). Have a great Christmas!
Nov 26, 2009. 12:08 PMMT-LB says:
a little hard to cut, maybe, but this is genius
Nov 22, 2009. 5:56 AMeucharist says:

Lol - how to instructify a pecan pie!

Nov 27, 2008. 10:43 AMtexabyte says:
if i were you for the oven I would take some fiberglass insulation and put that in the cinderblocks to help hold in heat
Nov 24, 2008. 7:05 PMravebot says:
yummy looks like a snowflake
Aug 30, 2008. 1:47 PMpuffyfluff says:
Awesome! This will be a great way to share my love of fractals.

90% of it will go to waste, though...
May 11, 2008. 11:20 AMPoppa Chubby says:
turkeytek, I have just discovered your genius for food. You get an A+ for this one. I'm wondering if another piece of durock under your oven rack would help diffuse the heat enough to avoid hot spots. Perhaps a couple of inches below the rack to ensure good airflow.
May 11, 2008. 5:01 PMPoppa Chubby says:
Or even some strategically placed cinder blocks. D'ya think a large piece of heavy steel or cast iron might do it? Something similar to say, a manhole cover? I might have to make a giant oven. Just because it can be done.
Nov 23, 2007. 9:11 AMPiMan314 says:
PiMan approves!
Jun 3, 2007. 6:09 PMSgt.Waffles says:
HAHAHAHAHA! You look like eric forman off of that 70's show:

http://www.that70sshow.com/images/gallery/s4/s4_eric.jpg
Jul 7, 2007. 6:21 PMmtgoldma says:
Wait, which one? I always think elf looks like Harrison Ford, but I'm partial. Maybe you were talking about tek. Or the pie? I don't think the pie looks like Eric Forman.

http://www.starwars.com/databank/character/hansolo/img/movie_bg.jpg
May 23, 2007. 9:09 PMkaren608 says:
dang! super pie, wall art.... so when are you opening the art studio cafe? cool!
May 26, 2006. 2:47 PMSugarTeen52 says:
Ewilhelm, you like the edge? (sorry for communicating through comments to ewilhelm, turkey tek!) Turkey Tek, looks delicious! How long did it take to do this again?
Mar 21, 2007. 9:51 AMVendigroth says:
was it worth it, for the pie?
May 7, 2007. 3:25 PMJames (pseudo-geek) says:
pecan pie is worth anything.
Oct 25, 2006. 7:02 AMSugarTeen52 says:
That's... pretty long!
Apr 23, 2007. 9:52 PMStepsoftheSun says:
One of my all-time favorites...
Mar 21, 2007. 9:50 AMVendigroth says:
how about a mobius-shaped pie next? i really like this, it's somewhere beyond cool
Jan 16, 2007. 11:52 PMBerkana says:
Wow, this is nerlicious! I salute your nerditude.

4 _
Dec 2, 2006. 1:01 PMall_thumbs says:
Finally a practical use of that fractal ho-ha.
Nov 30, 2006. 9:38 PMelfpower says:
It's not true that we didn't have a backup plan. Our backup plan was to make Thanksgiving Jello.
Apr 25, 2006. 10:26 AMewilhelm says:
Incredible! I assume you still have the pie pan somewhere in storage? Maybe once the glow of the Maker Faire has worn off, Instructables could sponsor a Bay Area Makers giant pie eating party? We could host it at Squid Labs, in Emeryville. I'll bet this design would also be useful at more conventional sizes. I know I always fight for the edge pieces of lasagna, brownies, and apple crisp.
Oct 30, 2006. 3:03 PMzachninme says:
It would seem, that for people who like corners, you should make pies of the same shape, but 3-6 inches in diameter. This way, each person gets their own pie, and crust!
Sep 24, 2006. 4:52 PMxrobevansx says:
is it safe to have that LP hose *in* the oven?
Aug 9, 2006. 8:26 AMmensmaximus says:
Ace. I'm thinking of a 50 ft. vertical container-pole vat for cooking in now. Food distribution in a $200/sq. ft world.
Aug 5, 2006. 12:23 AMDoom_Goat says:
Incredible, now try doing the mandelbrot set, that would be even more ove a challenge
Jul 1, 2006. 11:21 PMslyfox117 says:
Dude. sweet project. big food+math+building stuff=very fun
1-40 of 41next »

Pro

Get More Out of Instructables

Already have an Account?

close

All Steps Viewing
View all steps of an Instructable on the same page when you're a Pro Member.

Upgrade to Pro today!
60
Followers
6
Author:turkey tek
thanksgiving! ...and bringing technology to this traditional celebration of excess.