A2A Comanche 250 is on its way! (Released! July 2023)

This did the trick, thanks!

Have a question about wear rate, I have it set to norm, I’ve got an auction aircraft and done maybe 4 hours of flying myself, I inspect the engine before every flight and so far the engine is all in the green, I’m curious does anyone know how often things start to wear down and need replacing with normal wear rate set?

Is it random or can I expect certain things to wear down after so many flight hours?

Guys a short question: why is it recommened to always use full throttle on takeoff? If the runway is long enough and the conditions allow it (colder, headwind), why not use less throttle? I’d assume it saves on engine wear and fuel and it’s still able to get in the air. However I am no real pilot so I’m not sure, hence the question.

You want as much thrust and/or power you can get on takeoff. The object is to get off the ground and use excess thrust to achieve the best angle of climb speed (Vx) to clear any obstacles or the best rate of climb speed (Vy) to achieve cruise altitude in the shortest amount of time possible. Any setting less than that robs you of those excesses that give you the performance needed to get up to a safe altitude as shortly or as quickly as possible. By using less than full power, you’re also cutting your safety margin - not only obstacle clearance but in the event of a loss of power, you’re that much closer to the ground, to stall speed, etc. Get up to that safe altitude!

The only time you use less than full power is if the aircraft specifies that can be done and/or it’s written into an ops manual that calls for it in certain situations. This is known as a derate and and it’s good for saving a bit of wear on turbine engines (that can exceed their max rated power) when you already have the necessary performance, and is also often used in combination with noise abatement and/or environmental and weight conditions that don’t require full hog. You can also always cancel the derate in a pinch on those aircraft. However, you generally don’t use a derate in a piston and/or a single-engine aircraft because you want to get up and away from all the stuff on the ground in case that engine fails, while you’re still in a low-energy, high-drag state (in this regard, normally-aspirated pistons generally don’t have a bunch of performance in reserve - you’re already pushing the limits).

That said, some aircraft do call for a reduction in power (managed through MP and RPM for constant-speed props) during climb, but this is done after reaching a safe altitude, speed, and configuration.

Here’s the nice thing about the sim: try it. Do a static takeoff where you run up to full throttle and see how many RPM you get before you release the brakes. Fly out at Vx and/or Vy and note the rate of climb. Then do it again using 2-300 less RPM (or 2-3” less MP on a constant-speed prop) and note the new rate of climb for each V speed. Note that this is often one of the things that pilots run into in certain atmospheric conditions - specifically high density altitude. And with a normally-aspirated engine, not leaning the mixture properly can lead to a loss of power that can put you in a real bind in already-inhospitable terrain and poor climb performance (especially when heavy). This has killed a lot of pilots.

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I would add that full throttle means you are more likely to pick up on engine issues, especially in a familiar aircraft. If you have a problem or something like forgot to lean at a high altitude airport it will be much more obvious at full throttle where you know how much power to expect.

I actually aborted a take-off some years ago as full throttle power just felt “wrong” and it turned out the mags had somehow been switched back past both after runup. On partial throttle I may not have noticed.

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FYI (or for other peoples “I” at least)… I found the regular Timer in Elgato default widgets does the trick for me. Tap to start, audible timer (can pick from 4 sounds), Tap to restart. I set to 1200 seconds (20 mins) and it’s perfect!

image

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Does the Comanche have its own clock/timer? I can’t remember.

The clock is basic and is just right of the yoke on the panel.

I think there is a timer mode in the ADF, at least one of the switches has a “Timer” position - never used it though.

That’s really important. I have a friend that’s an old pilot. He told me once that he’d been doing a ferry flight on a single that had just undergone engine maintenance, on the runway it didn’t sound right, so he took it back to the mechanic who gave it a look over and said it was fine. So he went to take off again but still it didn’t sound right so he refused to fly it. The mechanic took it apart and found there had been an error made with reassembly before, sorry I can’t remember what, but it’s almost certain that the engine would have failed on climbout. You just cannot be too careful with flying.

“The three most useless things during an emergency are the runway behind you, the altitude above you, and the fuel left in the fuel truck.”

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The ADF unit has a timer counting up or down, and an alarm.

There is a clock and stop watch on the yoke.

Scratch that, I was thinking of the Arrow yokes.

I do not recall a stopwatch on the yoke.

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Are you thinking of the Piper Arrows?

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Yes, you are right. Mixed up my Pipers. :grin: I don’t really use the stopwatch.

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But Breitling would have you believe that you’re not a real pilot unless you have a super accurate chronometer on your wrist? I just wear a regular watch, but I’m only a poseur.

:grin:

Yeah … it’s good to be knowledgable. It’s good to be able to read maps and how to do dead reckoning and VOR/NDB navigation. I can do all that … but at the end of the day all modern aircraft have GPS. There is no need for a stopwatch when you know how much fuel you carry and the GPS gives you the estimated time of arrival, including wind deviation.

Alarm? how does it work? I’m reviewing the A2A manual I don’t find anything about it. Maybe in the manual of the real 841 ADF receiver?

No, they absolutely do not all have a GPS,

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Let me rephrase it: every sensibly equipped modern aircraft that does cross country flights has a GPS. On board or portable. :wink:

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It’s in the 841 manual linked in A2A document. Switch ADF to Elapsed Timer mode, hold the SET button, adjust the timer. It will sound an alarm when it reaches zero.

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Question on AP following flight plan, Ive read the manual lightly for using AP. I tested a short flight and switched AP mode to HI mode tracking and my aircraft followed the flight path.

When it gets to the next waypoint though I go off course by some margin, from reading the manual if I understand correctly, is this where I should take over and use heading mode to get myself back on track and then revert to HI tracking mode again?