Thruster88

In a spin aircraft roll and yaw yes? We see the aircraft for a very brief time, i see about 90° of roll, how can you see it is accelerating? There are many videos of aircraft spinning to the ground on the web now, they all look very similar, straight down will rotating. I believe it is in a spin and you will not convince me otherwise.

I currently have the transmit function turn off in my SkyEcho2 because it was last used in an aircraft with a adsb transponder, the centre light is off, it still receives and shows traffic on ozrunways samsung tab while in my house.

My SkyEcho2 with the unit in the house is showing jet aircraft out to about 40 nm. Make sure the SkyEcho2 is connected, not your home WiFi. Have a look on flightradar24 to see if there are any adsb aircraft near you.

On my 582 the Rotax needle type tacho shows a drop of 50 rpm one side and 300 the other. There is almost no audible drop on either side, they sound the same. 800 rpm drop would be very dramatic in sound and vibration. Suspect your tacho is telling fibs.

The aircraft in question is a Promecc Freccia RG. It is a European "ultralight " Mtow 472kg. The specs show a cruise speed of 140knots and a stall of only 35knots. 35 knots is a maximum for the class.....

Whatever

If you look carefully the aircraft is rotating so most likely in a spin, to spin one must first stall yes?

Easily avoided by not stalling the aircraft.

Yes, we plan to change the valve springs without removing the other 3 cylinders. Less surgery is always better.

I believe all the old piston single engine FAR 23 certified aircraft had to meet the 61knot stall limit. Lots of choice for USA sport pilots with a drivers license who have not been declined a class 2 medical. Only one pax though.

Interesting, I now know the purpose of dorsal fins on aircraft. No Van's RV aircraft have dorsal fins, i guess they want to keep that dna in the family.

The aircraft is a reims cessna f406 twin turbine. Assemetric training gone wrong?

If you watched and LISTENED to blues vid you would know the shot was most likely never encased in epoxy. The key hole borescope may show a simple repair is possible. This area of the aircraft obviously needs very careful consideration to avoid a Rob Holland situation.

I have a friend with a lsa55 jabiru with a gen4 engine about 4 years old and 50 hours total time. Over the last year or so another L2 friend has attempted to resolve a slight roughness in the engine, it seems to occur at cruise rpm. Carburetor, jets, fuel flow, spark plugs, ignition system changed etc have made no difference, all very frustrating. A few weeks ago the owner and I went for another test fly. As we rotated the engine lost power and became very rough. Taxi back in engine running rough the whole time. I got out and flipped the prop over, no compression on one cylinder. Suspected a stuck valve. Five minutes later flipped prop over and very good compression on all cylinders. Later we did a cylinder leak down and all were 76-77. Next we ran the engine up keeping an eye on cylinder head temps, it is very cold atm. After about 2 mins the engine started to run rough. Flip prop no compression on one cylinder. Got leak down test done as quickly as possible, every cylinder 76-77. Repeat two more times, same result, no compression then comes good very quickly. So we Suspected a hydraulic lifter problem. Order parts. Removed rocker cover from problem cylinder and found the big valve spring was broken. Pulled cylinder to check for other damage, none found. We will replace hydraulic lifters on that cylinder and all valve springs in the engine. The valve spring was broken in two places, suspect this happened at two difference times, one break small problem, two breaks big problem. So in a way it was a lifter problem, the little valve spring only is not as strong as the hydraulic lifter. This was on inlet valve. Engine was starting and ideling perfectly. The valve springs are very cheap but this has been a costly ordeal. I post for educational purposes. The valve spring can be seen in three pieces.

Did you have a look at Blues vid? Doesn't look like the elevator ends are removable. Yes everything would be weighed. Start light and keep adding and checking balance.