hi i forgot yesterday to mention in relation to electric power.....royobi and other manufacturers are making mowers and chain saws 36 v now and are using lithium ion batteries and chargers to suit...i dont think they have power controllers though.(the gnome engine on the focka try plane...red barron....had no speed controller/throttle....it was contrilled when taxing by an on off switch:)
i dont know much about this side of things.
props are generally 80% eficient.
weight devided by glide ratio is a rough calculation for thrust required for level flight.
a large slow diameter prop seems better for low power.
folding prop joints get hammered by single cylender motors.
thats about all i got on this subject.
russ.


On Thu, Dec 20, 2012 at 2:48 AM, Philip Lardner <This email address is being protected from spambots. You need JavaScript enabled to view it.> wrote:



I've uploaded four more pages detailing the root section of the centre wing section and the dihedral built into the wings:

Designing a 3-Part Wing - 10.jpg
Designing a 3-Part Wing - 11.jpg
Designing a 3-Part Wing - 12.jpg
Designing a 3-Part Wing - Detail of Root Area and Dihedral.jpg

I'll have a look at the rear spar and flaperons next...

Phil.

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From: This email address is being protected from spambots. You need JavaScript enabled to view it. [This email address is being protected from spambots. You need JavaScript enabled to view it.] On Behalf Of Philip Lardner
Sent: 17 December 2012 22:47

To: This email address is being protected from spambots. You need JavaScript enabled to view it.
Subject: RE: [Carbondragonbuildersandpilots] 3 Piece Wing


I've uploaded my initial workings for a 3-part wing to my folder in the CD yahoo group:

groups.yahoo.com/group/Carbondragonbuild...20a%203-Part%20Wing/

I still have to work on the rear spar details.

Constructive criticism welcome..!

Phil.

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From: Philip Lardner [This email address is being protected from spambots. You need JavaScript enabled to view it.]
Sent: 16 December 2012 21:00
To: 'This email address is being protected from spambots. You need JavaScript enabled to view it.'
Subject: RE: [Carbondragonbuildersandpilots] 3 Piece Wing


Hi ekolbs,

I've more or less completed a 3-part wing design / analysis for my own project. I've chosen to split my wing at Rib #5, giving me a 15' centre section and 14' outer sections (approx.) I still have to sort out how I'm going to secure the trailing edge of the wings, where the flaperons hinge, and how to split and connect the flaperons themselves. It's all still on a lot of sheets of paper, but I'll scan them in and post them up shortly. I'd be really interested to see what solutions you've arrived at independently - it might give me some ideas!

I'm interested that you're going to build in a second set of drag spars into your outer wings - are they strictly necessary - what are you reacting them against on the centre section of wing? I was planning on simply building in some means of connecting the rear of the ribs to transmit the compressive / tensile forces from the outer wings to the inner section. I will be using carbon rods in this 'rear-spar' along the wing.

There's an outfit Electravia who operate out of the Sisteron Aero Club, in France where I trained this year, who specialise in electric motors for light and ultra-light aviation. It might be worth looking at their website and talking to them - www.electravia.fr - the Alatus glider that they worked on is quite similar to the Carbon Dragon and may offer some ideas. I'm semi-considering doing something similar down the line (as a retro-fit) after I get my project finished. I like the idea of a pop-up motor behind the pilot, and am planning to build in a proper air-break system (upper and lower wing surfaces) in the main wings, just in-board of Rib #5, which should keep the air flow over the H-stab clean and free up the area behind the pilot's head for a motor assembly. All just ideas and sketches at the moment.

All the best,

Phil.

PS - what's your real name!?

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From: This email address is being protected from spambots. You need JavaScript enabled to view it. [This email address is being protected from spambots. You need JavaScript enabled to view it.] On Behalf Of ekolbs
Sent: 16 December 2012 13:44
To: This email address is being protected from spambots. You need JavaScript enabled to view it.
Subject: [Carbondragonbuildersandpilots] 3 Piece Wing



I cannot have a 22' wing so have been working on a 3 piece wing (paper) design. My design has a 12' center section. By the time you get out 6' from the centerline of the glider, the bending moment has dropped of significantly. The center section would be skinned to resist torsion and drag effects. The outboard wing sections would have the mid 40% section covered with fabric, similar to the original design, with a drag spar. My hope is to incorporate a very light engine (powered parachute type or large RC or two RC engines) strictly to get to altitude. The other advantage of this is that it allows my empty weight to go up to 254 lbs. Hope to generate some discussion with this.