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Old Jun 15, 2011, 12:31 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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1/5 Scale Horten IIIe (motorized)

I've been doing some CAD work on a 1/5 scale (4.1M) Horten IIIe for a while.

As of right now the plan is to laser cut all of the ribs, shear webs and center section bulkhead and the control surface skins out of a combination of lite and birch plywood. Most of the parts including the false (sub) leading edge are designed to interlock.

The main wing joiner is a 1 1/2" O.D. aluminium tube. The rear joiner is a going to be a 1/2" O.D. tube (I haven't decided the material yet).

More to come as I finialize the design. Of course any input is welcome.

Brian
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Old Jun 15, 2011, 03:24 PM
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United States, GA, Atlanta
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Nice cad work. I like how you put the motor in there. What CAD are you using?
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Old Jun 15, 2011, 04:23 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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Hey Tom,

I'm using Rhino v4.

About the motor...Are you asking how I did this in Rhino or how the motor will go in there on the real model?

In Rhino well that's a long story.

On the real model the canopy and a good portion of the top "cabin" will be removable. This will provide fairly easy access to the motor.

Brian
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Old Jun 15, 2011, 08:15 PM
Less Whinning, More Flying
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SF Bay Area, USA
Joined Feb 2003
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Very cool design and CAD work. Been doing CAD for years and am still no good at surfacing. How are you supporting the long prop shaft?

Sean
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Old Jun 15, 2011, 08:32 PM
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Oh no, I just meant it was cool how it was hidden away.
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Old Jun 15, 2011, 08:34 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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Hey Sean,

Rhino makes working with both surfaces and solids relatively easy with a bit of practice.

The prop shaft will be made from 5mm drill rod. It's going to be supported with an intermediate bearing. I've use a similar setup on a Horten XIV.

I have to admit that I don't have a lot of time on the Horten XIV setup but it seems to work fine. A slightly shorter version has been working fine on my Horten XVI.

Brian
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Old Jun 15, 2011, 09:02 PM
TEAM HORIZON
Lbuff1's Avatar
Killingworth CT
Joined Nov 2008
2,549 Posts
Brian, neat stuff.
I look forward to following your progress.


LEN
RCAerotowing.com
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Old Jun 16, 2011, 10:56 PM
less is more
Knoll53's Avatar
United States, CA, Marina
Joined Sep 2006
2,877 Posts
What a monster! It's going to be easy to see as you thermal off into the heavens.
Have you calculated the wing area?
The 1.5" joiner has tons of room to spare within the spar. That is one thick wing.
Do you plan on posting the aerodynamic data???
Looks like you have chosen a reflexed airfoil at the root at 15% thickness.
Should be a fun project.

Kent
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Old Jun 17, 2011, 01:04 AM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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@Kent - I'm hoping that it'll thermal well. I'll get you the wing area. I don't have the number with me at this moment. Yes, The airfoil is thick. It's a thickened S5010 @ the root if I'm remembering correctly...it been a little while since I've looked at the airfoil data.

Will I post the aerodynamic data? Maybe at some point. I will probably wait untill after the plane flies.

Brian
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Old Jun 17, 2011, 02:43 AM
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Australia, SA, Windsor Gardens
Joined May 2001
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I could almost fly that thing myself.
Nice work there Brian
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Old Jun 17, 2011, 01:25 PM
yyz
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Very nice work, Brian.
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Old Jun 20, 2011, 02:58 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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Thanks for the complements! It's definitely been a slow process.

As of late I've been strugling with the forward wheel and landing "pod" area on the bottom of the center section. I've done some rough drawings so far but I haven't been able to get any good pictures or drawing of the motorized version of the IIIe.

I've got this picture of the 1:2 scale version from the www.ig-horten.de web site:

This may be the best there is. Does anyone have anything better?

Thanks,
Brian
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Old Jun 21, 2011, 01:18 AM
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Australia, SA, Windsor Gardens
Joined May 2001
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I know of a video that has a 1/2 scale Ho III, that might have enough pausable views.
will look when I get home
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Old Jun 21, 2011, 05:15 PM
Designing something...
United States, CA, Cameron Park
Joined Jan 2004
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Okay, I think I found a better picture of the bottom of the plane. Now the question is did the IIIe have a retractable nose wheel?
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Old Jun 21, 2011, 07:26 PM
CNC Cutter
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United States, IN, Indianapolis
Joined Dec 2005
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Here is the best I have ...

Clearly there are differences between these versions
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Last edited by birdofplay; Jun 21, 2011 at 07:34 PM.
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