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Just did a forward slip last night coming in to land. Why do you ask, and which question does it answer?

I noticed that, too. The TAS here is from my ADAHRS and Air Data Computer, so the latter.

I just flew another test flight and took it up to 12,600' DA. Previously, at 12,600 DA I was flying: 120 KTAS 105 KIAS 5400 RPM 3.8 GPH Now at 12,600 DA I’m flying: 110 KTAS 91 KIAS 5430 RPM 3.7 GPH Fire-walling it doesn’t accomplish much: 112 KTAS 92 KIAS 5550 RPM 4.8 GPH I confirmed I...

Ball/trim was out exactly the same when I was flying faster, so if the nosewheel is responsible for that and was cocking over in flight before, that wouldn't explain it.

I don’t quite follow what you’re saying. How did an inop electric elevator trim result in you having decreased climb performance AND your airspeed indicating 10-20 knots slower than actual? Maybe it’s just late but would you mind clarifying? Thank you.

Ed, if they are one and the same how do I have pictures showing my panel flying in the same slip at the previous 120+ KTAS?

@Klaus M , I'm with you 100%. I do not like Tecnam. I think they are an awful company and make a great many mistakes on the products they build (and after sales support is nonexistent). It's a top down problem with their awful leadership and the family who owns and operates it. But it is the...

Looks about the same across the board. Attached is a comparison. There are some from before when I was flying faster where my nose is pitched up a couple degrees more in cruise.

Yes, have manually calculated. I was matter-of-factly flying faster before than I am now and it's not an indication error.

Mike, I get it and I appreciate it. I assure you that the flying in a skid issue will be addressed and thank you for repeating it. I'm just trying to focus on solving the airspeed issue for now.

Good suggestion, thank you. I will time it to the same DA as before, as I recorded after the new prop was dialed in (attached).

It's a Dynon SV-GPS-2020 antenna mounted below the windshield just aft of the cowling. It's exactly the same antenna in exactly the same spot. It just was weak so Dynon replaced it under warranty. I actually wondered a few months ago if the need for so much rudder trim was because the engine...

I agree. And the most obvious explanation is usually the correct one.

Engine mounts were inspected back in February and even had new rubber isolators installed then. I was. Nav logs calculated with 120 KTAS cruise had me arriving exactly when I was expected to. Now I always arrive late.

And that's what's funny. The airplane should be slightly faster than before given the OAT is colder now, and there's slightly less weight up front. POH says I should be flying 1-2% faster TAS with the colder temps.

Something definitely changed. That's the mystery I'm seeking help with. But the prop and rigging of the plane aren't the problem because I was flying perfectly fine at 120+ KTAS with the prop and rigging the way that it is.

Yes and yes. I agree with you and it's something I will address after this airspeed problem is resolved and I'm flying the 120+ KTAS I was flying before.

I sure am.

I can officially confirm we can rule that out. :yes:

It did, but not by much. The new prop is about 11 pounds lighter than the old prop. But we just added 5 pounds back to the engine bay with a larger battery. So I'm about 6 pounds lighter in front. But that didn't effect this airspeed problem because I was flying 120+ KTAS after the new prop and...