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Old Jul 21, 2015, 09:00 AM
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Basic design plans

Can someone look at these "plans" and tell me if they think it's a worthy cause and/or what you would change or modify? Each square represents one inch.

Thanks,
Ed
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Old Jul 21, 2015, 09:46 AM
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You're clearly after a "conventional" layout.
There's nothing egregiously wrong with the dimensions you've got.
Build it with reasonable wing loading and get the CG right and it will fly reasonably well.
There are, of course, many other options for overall layout (delta, canard, pusher, twin boom, tandem wings, etc.).
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Old Jul 21, 2015, 01:04 PM
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Definitely looking to go the more traditional route. This will be the first one I design and build on my own. I got to learn to crawl before I walk.

In the plans there are 2 fuselage side shots. Lower one is one inch smaller in height. Think it'll make much difference either way?
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Old Jul 21, 2015, 01:05 PM
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Also I'll be using an 8 inch wing chord and 2 inch control surfaces
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Old Jul 21, 2015, 01:10 PM
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And still deciding on whether to try a low wing design with a slight dihedral. I have an old "spar" in the shape of the dihedral from an old parkzone p-51.
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Old Jul 21, 2015, 01:28 PM
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There's nothing simpler than a simple delta (both build and flight characteristics). I and others talk about it in other posts (do a search).
The conventional layout is made up of many more components in comparison,
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Old Jul 21, 2015, 04:20 PM
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Quote:
Originally Posted by eolson View Post
Can someone look at these "plans" and tell me if they think it's a worthy cause and/or what you would change or modify? Each square represents one inch.
Thanks,
Ed
That slim one looks OK, but I would move the wing back a bit to make it easier to get the CG correct without adding ballast.
I hope the wing section shown is just schematic. I'd be using a symmetrical section rigged at zero degrees and with with no dihedral.
Build it light, rigid and straight and true and it will fly fine.
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Old Jul 21, 2015, 05:08 PM
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Quote:
Originally Posted by Whiskers View Post
That slim one looks OK, but I would move the wing back a bit to make it easier to get the CG correct without adding ballast.
I hope the wing section shown is just schematic. I'd be using a symmetrical section rigged at zero degrees and with with no dihedral.


Build it light, rigid and straight and true and it will fly fine.
Advice on wing placement noted...thank you.

The numbers on the plans represent actual measurements. One square = One inch.
Are you talking about the way the airfoil is shaped? Then yes, only schematic. I will be using Ed's EA Armin Wing instead.

I just got home from work and as excited as I am about building this thing, I'd rather take my time on this one. I have found I can get just as much enjoyment/pleasure from flying a well-built foamie than I can with a scaled out brand name planker! WOOT! So please keep the comments and suggestions coming and invite others to join in...I need all the help I can get!

Funds are limited while making way for the newest addition to the family coming in September...so foamies it is.....for now.

-Ed
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Old Jul 21, 2015, 05:09 PM
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Also, I can provide the Excel file the original plan was made in, since .xls isn't an accepted file type for attachments or uploading on RCG.

-Ed
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Old Jul 21, 2015, 05:12 PM
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And I used this page as a guide to draw up the plans through roughly based measurements.
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Old Jul 21, 2015, 05:21 PM
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Letís eschew obfuscation.
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I suggest about twice as much vertical tail & rudder area. On most planes the vertical tail is about the same size as half of the horizontal tail, or a bit more.

Also you'll get more rudder effectiveness (and better streamlining) if your fuselage tapers to the rudder thickness by the time it gets to the rudder. (Or maybe your square fuselage is just an artifact of your drawing method.)

Good luck, and welcome to the foamy design club,
Scott
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Old Jul 21, 2015, 05:58 PM
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Thanks for the welcome and the suggestions!
I am basing the build on Ed's square fuselage. My current plan is to make diagonal cuts along the corners and the bringing the cut ends together to form a more narrow rear fuse. I am all for more streamlining and efficiency, so I will try and work that in to the build as best I can.

When you say "size" what do you mean exactly? The area?

I am for other ideas for build techniques that still only call for foam board, hot glue, epoxy, and a couple handfuls of scrap balsa/ply....my current materials available.
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Old Jul 21, 2015, 06:06 PM
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Here's the plan with the wing moved back. Enough?

Also, I don't necessarily think that I want to just hot glue the wing and stab on the top of the square fuse and call it a day.
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Old Jul 21, 2015, 07:00 PM
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Quote:
Originally Posted by eolson View Post
Here's the plan with the wing moved back. Enough?
Yup, that's good now.
I usually make my planes with a longish battery bay so the pack can be moved fore or aft to tune the CG placement or accommodate different size batteries.
I also do trial balances during construction to keep an eye on the final CG.
When in doubt go for the nose-heavy option. A small amount of ballast will fix 'nose-heavy' but a lot more is needed to fix 'tail-heavy.'
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Old Jul 21, 2015, 07:33 PM
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Nice, thanks!

So I just covered enough board with tape to make a 36 square fuse. I mentioned earlier about making diagonal cuts AFTER the fuse was made, but I could go ahead and cut the board now BEFORE assembling.

Thoughts?

-Ed
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