Sailplanes by Hoekstra

[Maveric]

Hi all,

Jan L. Hoekstra built in the 1950´s the sailplane H.3 (attached drawing). I search for the H.1 from 1934 and the H.2 (maybe a project). Can you help?

Maveric

 

[hesham]

My dear Maveric,


this Netherland designer had been created the H.1,it was a two seat sailplane,after that
appeared the H.2,which was a small aircraft,but no more details,and here is anther 3- view
to H.3.

 

[Jos Heyman]

The Hoekstra H-1 two seater appears in the Dutch civil register as PH-24. It had a first fight on 22 July 1934 and was destroyed by gales in 1934 or 1935.
(Source: Dekker, H., Complete Civil Aircraft register, The Netherlands, Air Britain, 1987). This book has a photo of PH-24, which I will scan later today.
There is no reference to the H-2 and H-3 - so does anybody have more information - in particular a time frame

 

[Jos Heyman]

Here is the photo of the Hoekstra H-1. from the Herman Dekker book I mentioned earlier.

 

[Maveric]

Great Jos, many thanks. Do you have the dimensions...?

 

[Jos Heyman]

Sorry, Dekker's book does not give dimensions.
I have referred this to the Netherlands aviation forum at nederlandseluchtvaart.nl, so we will have to see what turns up there. Will keep you informed.

 

[Maveric]

Many thanks Jos :-*

 

[Jos Heyman]

I had a reply from Herman Dekker himself. He does not know about a H-2 so he concludes it was never built.
He confirms that the H-3 was a design of a single seat glider with a v-tail. Never built.

 

[Maveric]

Thanks again...

 

[hesham]

Hi,


has anyone hear about Hoekstra T-20 glider ?.


http://en.wikipedia.org/wiki/Hoekstra_T-20

 

[Jos Heyman]

I am away from my books until mid July so I cannot respond to this - but a T-20 does ring some (very) vague bells..

 

[hesham]

I am away from my books until mid July so I cannot respond to this - but a T-20 does ring some (very) vague bells..

Thank you my dear Jos,


and I hope to get its ID.

 

[Maveric]

I believe you mean the Akerboom-Schmidt T-20...

see: http://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=2529

 

[Apophenia]

I had a reply from Herman Dekker himself. He does not know about a H-2 so he concludes it was never built.
He confirms that the H-3 was a design of a single seat glider with a v-tail. Never built.

On that 'missing' H-2 designation, Herman Dekker does say that JK Hoekstra designed a 'standard training aircraft' while an instructor at the Nationale Luchtvaartschool in 1940. According to Dekker, this Hoekstra designed resembled the unbuilt Fokker P-1 Partner -- so, presumably, another low-winged twin-boomed monoplane with a single pusher engine in the rear of the central pod. http://www.hdekker.info/registermap/kandidaten.htm

Then there is that 1936 Fokker Spin replica (c/n 5365) which Jan Hoekstra designed and built with Emil Meinecke and Wim van Neyenhoff.* Is possible that this Spin III replica was assigned a Hoekstra designation?

* WWI German ace, Emil Meinecke was a Fokker test pilot (but had been hired as a mechanic). WM van Neyenhoff was the President of ACvZ (Amsterdamse Club voor Zweefvliegen or Amsterdam Gliding Club)

 

[hesham]

I believe you mean the Akerboom-Schmidt T-20...

see: http://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeur-fiche_0int.php?code=2529

No my dear Maveric,


the Wikipedia mentioned it as anther design;


http://en.wikipedia.org/wiki/List_of_gliders

Netherlands miscellaneous constructors

• Nijs & Van Driel T.10

• Akerboom & Schmidt T-10 - J. Akerboom & J. Schmidt

• Akerboom & Schmidt T-10 III - J. Akerboom & J. Schmidt

• Akerboom & Schmidt T-20 - J. Akerboom & J. Schmidt

• Platz Zeilvliegtuig – Platz, Reinhold – Netherlands

• Snellen V-20 – Snellen, Roeland J. – NV Vliegtuigbouw Deventer

• Hoekstra T-20 - J.K. Hoekstra

 

[Arjen]

Maveric links to a site that says the Akerboom-Schmidt T-20 was built by J.K. Hoekstra.

Constructeur J. K. Hoekstra, Katwikk, Nethelands 1

Nombre total de constructions 1

Infos techniques Roue fixe et patin.

Histoire résumée Version biplace du T-10, avec sièges en tandem. Peut être employé comme monoplace sans qu'il faille prendre du lest, le second siège se trouvant à la position moyenne du centre de gravité.

'J.K. Hoekstra, Katwikk, Nethelands' would be Jan G. Hoekstra, Katwijk, Netherlands.

It is possible the Akerboom-Schmidt T-20 and Hoekstra T-20 were different aircraft, but is seems more likely they were one and the same aircraft.

Hoekstra's company Hollandair mostly did aircraft repair, modifying aircraft may have been a sideline.

Images from http://www.j2mcl-planeurs.net/dbj2mcl/planeurs-machines/planeurs-docs_0int.php?n=2529

 

[Maveric]

Thanks Arjen, that´s also my opinion... :

 

[hesham]

Thank you my dear Arjen.