1/5 Scale Horten IIIe (motorized) - RC Groups
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Jun 15, 2011, 12:31 PM
Designing something...

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.

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Jun 15, 2011, 03:24 PM
Suspended Account
Nice cad work. I like how you put the motor in there. What CAD are you using?
Jun 15, 2011, 04:23 PM
Designing something...
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.

Jun 15, 2011, 08:15 PM
High Lift Coefficient
Sailhigh's Avatar
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?

Jun 15, 2011, 08:32 PM
Suspended Account
Oh no, I just meant it was cool how it was hidden away.
Jun 15, 2011, 08:34 PM
Designing something...
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.

Jun 15, 2011, 09:02 PM
Lbuff1's Avatar
Brian, neat stuff.
I look forward to following your progress.

Jun 16, 2011, 10:56 PM
less is more
Knoll53's Avatar
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.

Jun 17, 2011, 01:04 AM
Designing something...
@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.

Jun 17, 2011, 02:43 AM
Crazy Cessna Owner
Robbie d's Avatar
I could almost fly that thing myself.
Nice work there Brian
Jun 17, 2011, 01:25 PM
Registered User
yyz's Avatar
Very nice work, Brian.
Jun 20, 2011, 02:58 PM
Designing something...
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?

Jun 21, 2011, 01:18 AM
Crazy Cessna Owner
Robbie d's Avatar
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
Jun 21, 2011, 05:15 PM
Designing something...
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?
Jun 21, 2011, 07:26 PM
Retired CAD guy
birdofplay's Avatar
Here is the best I have ...

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

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