Horten microlight: project overview

Inspired by their beauty, a couple of years ago, I decided to design and build an own horten microlight aircraft, named “Schneewittchen” (“Snow White”).

With this blog, I would like to keep you up to date on the project.

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Schneewittchen – a horten microlight airplane

Schneewittchen is designed to fulfill the requierements of LTF-L (PDF), a class of very light airplanes with up to 120 kg empty weight. The requierements are quiet stringent, including not only the extremely low empty weight, but also a very low stall speed below 55 km/h (corresponds to 30 kn or 34 MPH). With the all-wing concept, Schneewittchen suits very well this class. To keep the weight as low as possible, I decided to use an electric drive (for example a Geiger HPD 10), as accumulators do not count to the empty weight.

Three-side-view

schneewittchen2

(PDF)

Data and specifications

Span:12.5 m
Surface:16.6 m²
Aspect ratio:9.4
Average chord:1.5 m
Sweepback:28°
Max. take-off weight:240 kg
Est. empty weight:95 – 103 kg
Best glide:25 at 83 km/h
Lowest sink rate:0,75 m/s at 64 km/h
Material:mixture between carbon composite and wood

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Making a motor carrier

Propulsion of Schneewittchen will be based on an electric motor and a foldable propeller. She’ll be an kind of motorglider and an electric solution is by far the best choice: easy and reliable on/off cycle, low noise emission, smooth running, clean, and light—as long as the batteries do not count to the empty weight. Ideal …

Continue reading Making a motor carrier

Videos of flight testing the 1:4 prototype

Maiden flight

Second flight

Onboard

Flying together with a milan

14 thoughts on “Horten microlight: project overview

    1. Yes, that’s the idea. Some small powered gliders with a monowheel manage to take-off without help, for example LS9 and Apis Bee. They have an approximate bank angle of 8 to 10°. The Snowwhite will have something around 7°. I have been told that rolling to the runway is no problem with 70mm inliner wheels installed at the wingtips, as long as the tailskid has enough load.

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  1. you can also check by using a truck like the one used in south France to introduce the Swift handling to students : it checks pitch stability and shows how sensitive is roll as well. Could be a trick to use before taking off on your own or being towed on short distances even before this …This “truck” was used at Gap Tallard and the company called Bartair – same trucks were used for certification of hang-glider and load testing also

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  2. if this testing truck solution interest you i can search here in France where is this equipement and how could you use it- Very “flying wing friendly” people i guess tey would be helpfull …if ever you are interested

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    1. Hi Thé, that sounds like a great idea! It’s a little bit too soon to look for such a truck. We still have lots to do before we maiden Schneewittchen in any way. However, knowing that there is such a possibility is very good.

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  3. Jaime schorr

    Wonderful plane…flies with minimum control surfaces and saves weight…great!
    Did you think to share blueprints for homebuilders or just for enjoy building this beautiful bird?

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    1. Dear Jaime,

      thank you for your interest. We’re still developing the airplane and as long as the prototype has not flown, we’ll not share blueprints or offer parts to other homebuilders. There is still lots to desgin, develop and build before it can fly. Having finalized flight testing and maybe modifying a couple of things, we’ll think about how it can be shared with other builders.

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