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Post by Glenn on Jun 5, 2021 21:23:05 GMT
Assuming you are comfortable with the Lycoming and Continental engines, it takes a bit of faith to relax with a Rorax buzzing along at 5 to 5500 RPM. But the engine is happiest at that 5 to 5400 range and is least stressed there. Your takeoff setting should be full power, every time, and hold it at full power until you reach a safe altitude or your intended cruse altitude. This usually comes out to a 70Kt airspeed with the 912is, accepting whatever rate of climb this gives you. The RPM should be about 5200 at that climb airspeed and the rate will vary depending on weight and density altitude. 4500 RPM is a bit low for long cruise periods. especially with 100LL. The engine will run happier near 5000 and clear the lead better. The 914 engine will require more throttle management on takeoff/climb; the 912 just wants you to floor it and manage your RPM/Airspeed with angle of climb. I agree with everything you said. Sounds like you've been to Rotax school.  |
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Post by TecBerry on Jun 6, 2021 15:30:10 GMT
I did 5 take off and landings yesterday and it went better. On my first take off, I let the nose come up like Flocker suggested, but it never would pick up enough speed to rotate. I put the nose wheel back down, stick to almost full forward until I reached 60 plus, pulled back and rotation was good and positive. On the other 4 takeoffs (2 touch and go) I kept the stick forward until 60+ and rotation was good. I leveled off until reaching 70 and started my climb. It was 80 degrees and density alt. was 4800', winds calm, tanks half full. It just seems like I'm using a lot of runway to get this 800 lb aircraft in the air, probably because I'm used to my motorglider (912, 80 hp) and my old 180hp 172 leaping off the ground in half the distance or less. I've asked the previous owner what the prop setting is and my mechanic and I will figure out what we need to set it. I've watched a couple videos on setting the prop pitch, but none were very detailed. I do know that I need a pitch pin. If anyone knows a good resource or video on setting the pitch, please share. Thanks for all the great advice from everyone.
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Post by LSA Flyer on Jun 6, 2021 19:07:33 GMT
60Kts is a good target for rotating with the 912. That should give you a positive rate of climb out of ground effect, without settling, then pitch for 70 Kts climb. I'd hold the stick neutral on the roll (assuming its a paved RW), not back, and check you are not accidentally resting pressure on the top of the rudders. Its easy to retard the rollout by unintentionally dragging the brakes to correct centerline drift. A quick stab of the brakes and then get off completely ASAP. The rudder will gain authority as you gain speed; keep your heels on the floor and use all the rudder/none of the brakes unless directional control requires another stab. You are correct; there is no "leap" as you are accustomed to, it's a progression.
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Post by Flocker on Jun 7, 2021 1:14:56 GMT
I did 5 take off and landings yesterday and it went better. On my first take off, I let the nose come up like Flocker suggested, but it never would pick up enough speed to rotate. I think our pitch is different. I want to say I'm at a 5. I'd have to check my logbook. |
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