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I have a Tecnam Astore low-wing with 912iS and I get about 350-400fpm in climb, and that's at a couple hundred pounds under MTOW. After the first 1,000' of course. Maybe the first 1-2,000 feet MSL I climb at 600fpm. But then it quickly drops and takes ages to get up high. Then I see something like this... the VL3, with the same engine, same weight, and it does 1300fpm? How? How's that possible? What in the world is wrong with my airplane then if I can only get 400fpm flying solo? No, I don't have a retractable gear, but that can't be the difference between 3x the climb rate with the same engine and same weight.

  • Re: 912iS only 350fpm climb rate?

    by » 8 months ago


    There can be many factors at play besides engine performance: What propeller do you have? Is it variable pitch? If not, is it tuned for climb or cruise?  Are you using best angle or best climb speeds? Under what conditions: hot, high, humid can really affect performance. Maybe is not the Rotax


  • Re: 912iS only 350fpm climb rate?

    by » 8 months ago


    Yes something does not seem right. I get over 1000 ft/min with my fixed gear Sting S4 and IS engine. I would go back to Tecnam and ask them....

     


  • Re: 912iS only 350fpm climb rate?

    by » 8 months ago


    HP is a formula.  torque X RPM / 5252 = HP...simple and that is all your engine can do.  If you do not have enough RPM you have low power.  The question here is what RPM are you getting in climb?  Assuming you have a factory set aircraft with the factory settings on the prop pitch it should give you the 1300 at sea level on a standard temperature and pressure day.  For every 1000 ft elevation the engine will lose about 1% power due to less air for every cubic foot of air it breathes.  Temperature plays a great deal into this, hot air is less dense, therefore it is like altitude and you need to factor in the altitude density of where you are flying.  If you happen to be in that heat dome in the south right now expect much lower performance until it cools down.  

    I can remember in Las Vegas Nevada, where it can get hot in the day, many people would just stay on the ground until it would cool off near or after sunset.  it made that much difference.  Just a thought.

     

    Cheers


  • Re: 912iS only 350fpm climb rate?

    by » 8 months ago


    Glenn Martin wrote:

    Yes something does not seem right. I get over 1000 ft/min with my fixed gear Sting S4 and IS engine. I would go back to Tecnam and ask them....

    Tecnam doesn't fix airplanes. They simply sell new airplanes. The day after you buy a Tecnam, any problems with it are exclusively your problems and they will only help if they have time in between delivering new airplanes -- and they never have time. Tecnam is the worst manufacturer I have ever witnessed.


  • Re: 912iS only 350fpm climb rate?

    by » 8 months ago


    Rotax Wizard wrote:

    HP is a formula.  torque X RPM / 5252 = HP...simple and that is all your engine can do.  If you do not have enough RPM you have low power.  The question here is what RPM are you getting in climb?  Assuming you have a factory set aircraft with the factory settings on the prop pitch it should give you the 1300 at sea level on a standard temperature and pressure day.  For every 1000 ft elevation the engine will lose about 1% power due to less air for every cubic foot of air it breathes.  Temperature plays a great deal into this, hot air is less dense, therefore it is like altitude and you need to factor in the altitude density of where you are flying.  If you happen to be in that heat dome in the south right now expect much lower performance until it cools down.  

    I can remember in Las Vegas Nevada, where it can get hot in the day, many people would just stay on the ground until it would cool off near or after sunset.  it made that much difference.  Just a thought.

    Cheers

    I have a 3 bladed sensenich prop. Fixed. It was pitched by Lockwood to achieve book numbers in cruise. The climb rate is really the most disappointing thing about my airplane at the moment. Even 150 lbs under MTOW, it's nearly a 30 minute climb up to 10,500'. It's hot out -- 85-90F on the ground -- when I fly. But you'd think it would do better than that. To think that other 912iS powered planes can get up to 10,500' in about 7 minutes -- 4x quicker than I can -- really makes me yearn for more climb performance.


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