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Old Mar 07, 2013, 09:22 PM
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Tilly DeHun's Avatar
United States, OR, Cottage Grove
Joined May 2012
7 Posts
Build Log
First Foamie - Spitfire from HJ Plans

OK, here it is, my first adventure into foamie construction. I have started with Hans-Joachim Walter Drawings done under pressure and then just "Winging" it. I have cut out everything from the thicknesses of Depron that he stated in his plans and now I am figuring out how to put it all together. The first step will be to construct the wing. I have scaled it down to a 43" wing span. (Plotted the PDF on a 22" x 53" drawing from a plotter with a roll. That scaled it wonderfully.

What I am trying to determine now is the airfoil needed and the the number and size needed for each half. I have also noticed that some have built this with larger than original aircraft scaled ailerons. I am not trying to build a perfect replica on this attempt. What is most important is that it flies well. I have been working with delta wings for a long time and am really looking forward to something without elevons!

A question I want to throw out there is; can I get away with a flat bottom wing for this size aircraft and still get good flight? My knowledge of airfoil design is minimal.
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Old Mar 17, 2013, 08:34 PM
Growing with the hobby
United States, CA, San Diego
Joined Mar 2013
22 Posts
Yes, a flat wing will work just fine. Do you want the plane to look more scale? or more on performance? for scale you might want to do a bit of research on the airfoil and how to do it. If you want a bit of performance and aerobatics you might want to go with a KFm airfoil.
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Old Mar 18, 2013, 09:19 AM
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Tilly DeHun's Avatar
United States, OR, Cottage Grove
Joined May 2012
7 Posts
Thank you Jaflyer. I have decided to go with a flat wing this time. I am going to make the wing detachable so I can build a new later. since I am new at this, a flat bottom wing was a little easier to construct. I will update the post soon with more pictures.
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Old Mar 18, 2013, 02:15 PM
Growing with the hobby
United States, CA, San Diego
Joined Mar 2013
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Can't wait to see the results.
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Old Mar 18, 2013, 03:32 PM
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Tilly DeHun's Avatar
United States, OR, Cottage Grove
Joined May 2012
7 Posts
OK here is an update of the progress. I decided to go with a flat bottom wing design. One of the primary reasons was was ease of construction. This being my first Depron foam aircraft I did not want to complicate the matter. I will also probably make the wing detachable so I can always build a new wing with a different airfoil. I think I need to learn a little CAD so I can make my own drawings and cutout templates. (So where are are the free/open source CAD apps?).

Attached are some latest pics with descriptive captions.
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Old Mar 18, 2013, 09:29 PM
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Canada
Joined Nov 2000
6,632 Posts
An airfoiled wing.. ie: two skins separated by a spar will give far superior performance results to a KFM effort.. Looks better too :-)
Learning adequate CAD skills is a multi months if not years adventure.
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Old Mar 29, 2013, 03:04 PM
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Tilly DeHun's Avatar
United States, OR, Cottage Grove
Joined May 2012
7 Posts
OK, Here is my progress report. I received my much anticipated package from Tower Hobbies consisting of my new motor, speed control, battery, prop, spinner and a couple of servos. (I love getting new toy parts in the mail!). The wing is progressing with a few little glitches. I made the mistake of cutting the bottom and top of the wing the same size out of 3 mm Depron. Since a wing has a greater surface area on the top I am going to need to re-cut the pieces. It will be better now anyway to piece them together because of the irregular shape. I will post when I get there.
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Old Apr 03, 2013, 11:37 PM
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Tilly DeHun's Avatar
United States, OR, Cottage Grove
Joined May 2012
7 Posts
Progress Report

Progress is slow because of the custom nature of this plane and my inexperience with working with Depron. I ordered the landing gear and some horns, control rods, pass-throughs and a tail drag. I also ordered a battery charger/balancer to keep my batteries in good shape. I just bought two new LiPo's and I want them to last given the cost. Check out the picture captions for the update.

Any input or suggestions are warmly welcome!
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Old Yesterday, 11:45 PM
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Tilly DeHun's Avatar
United States, OR, Cottage Grove
Joined May 2012
7 Posts
Picking back up

Greetings,

Sorry for the long delay. I have been battling some medical issues that made working on RC a low priority. The sun has started shining again here in Oregon and it has inspired me to work on the Spitfire again. I just ordered some new parts and made some new design decisions. I will be posting pictures as soon as things start looking different.

Tilly
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