Hans U & Samuel D Gautschi Hatz Classic Project: rotecradial
Hans & Sam (Sam is the son of Hans) Write (2005):
Hans & Sam Have a Website: http://www.aeroplaneworks.ch
- Hatz Classic modified to look like a vintage Waco, by Hans & Sam Gautschi, Switzerland
- A life long dream came true when back in the Spring of 2004 my son told me about his strong desire to build an airplane with me. I was delighted as I've always wanted to build a real airplane instead of the many years spent building and flying small scale models.
My Son's suggestion changed thoughts on what I thought could and or would ever happen! After raising two children, a married guy should have family things to do in the evening rather than building airplanes. Luckily for me my wife Therese supports us in our joint project.My Son and I have always loved vintage airplanes, especially biplanes, so the choice to build a Hatz was not a difficult one to make. But that really came later as our first considerations centered around a replica Gipsy Moth (mostly for the looks and the ability to fold the wings). The limiting factor in selecting a Gipsy Moth was the lack of a reliable and serviceable in-line engine which made the project unfeasible; so it was that we settled on the Hatz biplane, which despite not offering folding wings, became our choice based on 3 reasons:
- Another home builder in Switzerland already was building a Hatz Classic and, being an aircraft engineer by profession he did all the stress calculations (requirement in this Switzerland!)
- The availability of the Rotec R-2800 radial engine and subsequently the R-3600. The Rotec Radial is a natural fit for the Hatz (or is it vice versa?)
- The Hatz CB-1 is a well proven design and the Classic is an extension of the CB-1 with some beefing up to accommodate a 160HP flat engine. The Classic in design is more pleasant aesthetically and matches the desirable look of the late 1930's Waco biplane in design. The basic Hatz Classic design provides a perfect base which can accommodate small cosmetic and design changes.
Initial discussions about the suitability of the Rotec 7-cylinder radial started a lively discussion about the feasibility of this engine as rated at 110 HP power the concern was it would be under powered for the craft; but the advent of the 9-cylinder R-3600 it solved this concern and we moved forward with our plans and in 2005 and we placed an order for a R-3600 for our "Classic" at Osh05.
Our forward planning and goals were to use the Hatz Classic plans as a base, but undertake the following modifications to achieve a vintage "Waco"- like look:
1. New elliptical tail-plane and modified fin design with ground adjustable incidence device. The fin is separated from the fuselage (can be removed). The area between stabilizer and fin is closed with an aluminum panel.
In the final analysis, we are trying to build a vintage looking 1930's biplane by using modern materials and methods to achieve our goal.
Our thanks go to American Mehlin Smith, who's custom vintage Hatz which greatly influenced our thinking on the project (see picture at left showing a red/cream Warner powered Hatz)Our efforts, as a father and son team, are towards living our dream, and achieving our dream! In the process we're having a great time!Stay tuned! - Hans & Sam Gautschi (H.C. #78, Switzerland)
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From: Samuel Gautschi
Sent: Wednesday, 25 June 2014 4:26 AM
To: Paul Chernikeeff
Subject: RE: First flight of Rotec R3600 powered "Vintage Hatz"
First flight photos of Rotec R3600 powered "Vintage Hatz"
Best regards Samuel
April 8, 2014 - Hans and Sam write:
From: Hans Ulrich Gautschi
Sent: Tuesday, 8 April 2014 1:56 PM
Cc: 'Samuel Gautschi'
Subject: "Vintage Hatz" taxing photos and video
Dear Paul and family,
We would like to let you know, that we have our Hatz finished and are awaiting sign off for first flight (which takes it’s time in this country!).
The aeroplane is on the airfield and your engine runs flawlessly although a bit oily in the beginning (so far everything sealed, no oil exciting except exhaust). We are very happy with it’s behaviour and sound….
Thank you so much for creating such an engine without it this project would have never been possible!!!
Please find enclosed some pictures and a link to a new taxiing video on youtube:
Kindest regards - Hans & Sam, Switzerland
Rotec R3600 Powered Hatz Classic undergoes ground testing with flight approval imminent
Jun 23, 2013 Plane nears 100% Completion with the start of ground testing;
These are the First Rotec (R3600) Engine Runs on this Hatz
7th March 2013 Hans writes: We hope to have authorisation to make the first flight this late summer!!! .
We will be able to take 'completion' pictures of of the Hatz/Waco when its ready to fly in the early summer (at the moment we are waiting on flying wires).
P.S. I would like to point out that my son Sam (31 years old) has done all of the sheet metal work as he is a master sheet metal craftsman. I on the other hand will take most of the credit for the on the design changes made to introduce a vintage WACO bipe influence.
< Photo oppposite Left to right : Hatz/Wako, Rotec Radial R3600 mounted with speed ring and prop, Hans then Sam. We have progressed beyond this stage to covering and painting (see above).
Hans & Sam, 4th of November 2010: Rotec R3600 mounted and a speed ring added. Work on the wimgs under way
From Hans & Sam, 23rd of April 2008: ... Great progress in a quality build ...
From Hans & Sam, 27th of March 2008: ... next a mounting frame for a Rotec R3600 and consideration for accessories such as oil tank, fuel tank, Rotec electric fuel pump, TBI, instrumentation (gauges) ... etc
From Hans & Sam, 23rd of November 2007: Fuse is nearing completion and thoughts are turning to mounting an engine
Fron Hans & Sam, 1st of March 2005: This fuselage is eagerly awaiting your beautiful 9 cyl. radial engine! How