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    Rupert Gruen

    Ultravia Pelican PL
    Rotax 914
    Airmaster AP332
    Warp Drive 67R

    I built my Pelican PL with a Rotax 914 turbo engine. I wanted to get the most performance out of my aircraft, as I live in a mountainous region. The 914 turbo charged engine lends itself to a prop like the Airmaster, as the constant speed function permits one to fully utilize the full power of the engine through all phases of flight, and especially for take-off. 



    As I live very close to the Rotech Canada facility in Vernon BC, [distributors for Rotax engines in Canada and the USA] I have had been able to get a lot of useful insight and information regarding my engine and propeller combination from them. My prop was factory set for t/o, climb and cruise at 5700, 5500 and 5000 rpm respectively, as per Rotax recommendations. However, I now only use t/o and cruise settings for my everyday flying. The Rotax 914 max rpm is 5800, the engine redline. My Grand Rapids EIS RPM warning setting is set for 5700, so I rarely exceed the 5800 rpm limit, and if I do, it is for a few seconds only. I get 39,9 inches of boost[MAP] and 5700 rpm for t/o, and the Airmaster keeps it there, or within 50 to 80 rpm of that figure.



    After my initial climb out, usually for 3 to 4 minutes, or to a safe altitude, I set the Airmaster controller unit to climb mode, which settles the rpm in at 5450 to 5500at 35 inches. [max continuous operation boost.] When talking to a Rotax representative from Austria a while back, he said how much the 914 likes to operate at this rpm range, and how 5000 rpm is too slow, and tends to “lug” the engine along. So I took his advice, and have been using the higher rpm ever since.



    The neat thing is, the Airmaster keeps this rpm up there even at lower MAP settings, so I now cruise along at between 5400 and 5500 all the time, and get really good airspeed results to boot. I can typically maintain 5450 rpm at MAP settings at even 28 inches. The 914 - Airmaster combo permits me to get sea level performance up to 16000 ft. It is nice to have the turbo power in an emergency, and a prop like the Airmaster, which responds so well to a full power scenario when one needs it.



    Airmaster has been awesome with customer support, and the unit is a joy to work with, and easy to maintain and service. A really quality product. I have 145 hours on the prop now, and love it. I would be happy to chat with any owners who would like to talk props. 

    Thanks, Rupert Gruen.

    Products specifications
    Aircraft Pelican
    Engine Rotax 914
    Hub AP332
    Blade Make Warpdrive
    Products specifications
    Aircraft Pelican
    Engine Rotax 914
    Hub AP332
    Blade Make Warpdrive
    Product tags