Hatz Biplane Association

That is a very nice looking plane. I have just completed a Kelly D with a Rotec R3600 engine and have some questions on the engine. I posted the below message on the Biplane Forum and it was recommended that I contact you. Any comments would be appreciated. Thanks, Stan


Have just obtained my airworthiness certificate on my Kelly D that has a Rotec R3600 installed. My questions relate to the oil that is being used by those of you that have this engine. I initially installed Mobil 1 15w50 fully synthetic but just changed to Castrol 4T 20w50 motorcycle oil -- which is a natural oil. Only had a little over 4 hours taxi time on the engine and made the change because of what I read from Rotec that the PSRU gears needed the additive which is in the motorcycle oil. Saw my oil pressure go from 60psi with the Mobil 1 to 30psi with the Castrol. My only explanation is that the Castrol was foaming. Only have ran the engine 30 minutes with the Castrol. What are you guys using in the engine and what kind of oil pressures are you seeing? Any comments would be appreciated.
Thanks, Stan

Let me be the first to say "Wow that's beautiful" There seems to be much artistic talent in your family, be very proud.

Ed

Hi Hatz friends,

I am also getting older, have passed my 63th birthday and my dear daughter painted our "Vintage Hatz" in flight for me!
I would like to share this beautiful painting with the gang!

Best regards
Hans, Switzerland

Hi Al,

thank you very much for the hint! First we check with MT Propellers what they might offer us, because we ordered something different! They might propose the same - will see.

Kind regrads
Hans

P.S. another 2 pics taken in the evening sun with nice surrounding

Hello Hans and Sam,
I had the same overpitched condition on the prop I bought for one of my planes and the maker of the prop was able to carve out some of the pitch. He cannot add pitch, but often there is ample material to flatten the angle. You do lose a little in the width of the blade, but that favors the direction you need. Just a thought.
Congratulations again,
Al

Yes, we are very happy with our Rotec radial. It runs very well! However, the prop is overpitched, will have to have a new one. Last weekend we compared the airspeed indicator with the one on the GPS: we found, that the true airspeed is more than indicated! More later, when results are ready to publish.

Hans & Sam, H.C.#78, Switzerland

Congrats, she's a beauty. Great pics and video. Thanks for sharing. Herb.

Great flight. Beautiful plane. Well done.

Are you happy with the Rotex? Love the sound

Michael
N9648B

Hi Hatzers,

Enjoy this regular sight video of our first flight!

https://www.youtube.com/watch?v=f0_Ki2e78MA


Hans & Sam, H.C. #78, Switzerland

A first flight video is on the net!

https://www.youtube.com/watch?v=QRp-wuuGvao

Hans & Sam, H.C.#78, Switzerland