Same plane but does not fly as well as the first one...

[spoiler]

I dumb thumbed my 27% H9 Extra 260 in on the Easter weekend. It was flying beautifully on the day and this was partly why I was quick to build another. I found a partially assembled version and re-installed the same motor Rx and servos. The specs are as follows: Moki 2.10 power, RS10 DS 35Mhz Rx, Hitec 645 MG servos on all surfaces bar the elevators which are 635HB's. First plane flew perfectly on this set up. I used the same radio programming and positioned the battery in the same place as the first extra.

The first flights today went well - almost no trim required for straight and level flight and second flight I moved the battery to my preferred position behind the rudder servo. Now, this is where it gets less than great - the first plane had zero, and I mean absloutely no coupling in knife edge - either way. This meant perfectly flat rudder only turns too. The new plane is the same canopy in with left wing down but has significant coupling to the gear with the right wing down. Its fairly easy to control but is not what I am used to and inexplicable as far as I am concerned. I have just done another lateral balance and added 5g of led to the left wing, but I doubt this is the reason.

The other trait that the first plane didnt have was a need for significant aileron diferential. the new one looks as if it does.

Has anyone experienced something like this when building another supposedly identical ARF? I know the planes don't always come out of the factory identical but I am surprised at the major difference in k/e performance between the two. The only thing I noticed during the build was that the stabiliser was ever so slightly out of alignment with the wing - so slight it was hard to see. Could this be a cause?

[Unbalanced]

Check the wing incidences. Cspaced had one of those a while back and one wing was a couple of degrees off. Come to think of it, another guy in our club also had one with one wing's incidence off a little bit. It's worth a check anyway...

[zoomer260]

	Quote: Originally Posted by Unbalanced
	Check the wing incidences. Cspaced had one of those a while back and one wing was a couple of degrees off. Come to think of it, another guy in our club also had one with one wing's incidence off a little bit. It's worth a check anyway...

Your avitar still gives me the creeps.