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Old Jun 15, 2011, 12:31 PM
cpdude is offline
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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
TomGeorgia Top Spin is offline
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Nice cad work. I like how you put the motor in there. What CAD are you using?
Old Jun 15, 2011, 04:23 PM
cpdude is offline
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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
Old Jun 15, 2011, 08:15 PM
Sailhigh is offline
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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
Old Jun 15, 2011, 08:32 PM
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Oh no, I just meant it was cool how it was hidden away.
Old Jun 15, 2011, 08:34 PM
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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
Old Jun 15, 2011, 09:02 PM
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Brian, neat stuff.
I look forward to following your progress.


LEN
RCAerotowing.com
Old Jun 16, 2011, 10:56 PM
Knoll53 is offline
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less is more
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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
Old Jun 17, 2011, 01:04 AM
cpdude is offline
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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
Old Jun 17, 2011, 02:43 AM
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I could almost fly that thing myself.
Nice work there Brian
Old Jun 17, 2011, 01:25 PM
yyz is offline
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Very nice work, Brian.
Old Jun 20, 2011, 02:58 PM
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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
Old Jun 21, 2011, 01:18 AM
Robbie d is offline
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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
Old Jun 21, 2011, 05:15 PM
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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?
Old Jun 21, 2011, 07:26 PM
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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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