Thanks, let’s try this one then:

Adrien

Found this curious Guritzer Van Nes A III that looks similar to your reverse sesquiplane but that is as far as I got before the trail went cold. (Not that it was ever hot!) There was mention of an A II as well.

Congratulations Moze, this was the Guritzer Van Nes A II, according to the excellent book Luftfahrzeugbau in Österreich by Reinhard Keimel.

There was also a similar A I. In #151, I said that the A I had a Siemens engine but this is because I read the book entry too fast. Actually both the A I and A II were first equipped with an Anzani, only the A I was later converted with a Siemens.

The A III you posted was later used to advertise Rinso products:
http://pfarre.aspern.at/Chronik/Geschichte/rinso.php

Your turn,
Adrien

Time for a hint. The aircraft is a true inverted sesquiplane, named after two persons. These two persons made three models, all of a similar design, a first one with a Siemens engine, this one with an Anzani and a third one with a Walter. The third one was used for advertising, notably for “Rinso” products.

The designer of these aircraft later made other models in association with someone else; the aircraft pictured below was made after one of those later designs.

Adrien

Ah. Sorry there was a misunderstanding.
I only claimed that it was a no-name Lachassagne “avionnette”:

This one was made by Lachassagne. I didn’t find a model name, other than “monoplan”, “avionnette” or “avionnette d’étude” (in an old postcard).

At least this is how it is called in Les Ailes 19/5/32:
http://gallica.bnf.fr/ark:/12148/bpt6k65601665/f6.image
and 26/5/32:
http://gallica.bnf.fr/ark:/12148/bpt6k6560167k/f1.image
http://gallica.bnf.fr/ark:/12148/bpt6k6560167k/f12.image
as well as on this postcard for sale at eBay:
http://www.ebay.fr/itm/alte-AK-Avionnette-d-Etude-Lachassagne-18-C-V-/310868871165?pt=Ansichtskarte_Zubeh%C3%B6r&hash=item48613a87fd

I also claimed that the exact same aircraft was called Lachassagne AL-3 at Aviafrance, but that this was probably a mistake:

At Aviafrance, a picture of the same aircraft is shown as the Lachassagne AL-3 with Darracq engine and dated 1923, but I guess there is a mistake:
http://www.aviafrance.com/lachassagne-al-3-aviation-france-10188.htm

But then you said that there was no mistake at Aviafrance, which confused me a bit more. Did you really have a look at the Aviafrance page? Now that you posted a picture of the true AL-3, the mistake is very obvious.

Because I sincerely thought that no better answer could be found than “avionnette Lachassagne”, I posted another. But maybe the aircraft you showed has another name than “avionnette”. In that case I wish good luck to other participants to find it.

Best regards,
Adrien

I don’t see any difference between the aircraft you posted and the picture of the AL.3 at Aviafrance. Is it that the difference is very subtle, or is there really an identification mistake ?
Adrien

Well done, up to you.
Adrien

It’s the Daspect 3. The clue on the background, at the left, is a Kellner-Béchereau light plane (probably E-5 or ED-5), shown at the same competition.
Adrien