That's pretty close but if we do the math on that.

1/64" on a 2.5" wide aileron is 0.35 degs. If you are measuring at the widest part of the aileron say its 3.5" long then 1/64th of an inch error is 0.25degs

Now this is of course if you are a full 1/64" off.

Sorry I'm a Quality Engineer by training and I look at these types of things in terms of how accurate I can get them.

I use a 7" pointer on the surface at this the same 1/64" error is 0.12degs. This is why I say I can get it down to about 1/10th of a degree.

Just a note for how much differential I'm using in my models. On the Smaragd I flew a really long time it was 0.5 degs difference when the ailerons were at full deflection of 10.5degs. So the up aileron went 10.5degs and the down aileron would travel 10.0 degs.

My Pinnacles are running 0.6degs of differential. My Supreme's ran 0.75 deg. And my Hydeaway was around 1 full degree of differential. Now this differential setting is really determined by lots of factors but in them is how far off the "center" line of the fuse the wing is. A lower wing model will need more differential than a more mid wing model. Not to say that a model that needs more differential is not a good model...It just means it rolls better or looks better rolling with some differential in it.


So the question becomes is 0.25 to 0.35degs of error good enough when you are talking about a total differential of 0.5 degs

I guess the answer will differ greatly depending on who is flying the model.

Check the differential at different speeds. I have noticed some funny stuff with top hinged surfaces. These need more down travel than up travel because of where the pivot point is. I have theory that these differences in travels become exagerated as speeds change. This shows up in my flying when doing the rolls at the tops of a double I or at the bottom. Sometimes the speed difference is not much but the model will not roll axially the same in each instance. I Perhaps as we drift off further away from equal travels on the ailerons this becomes more of an issue. Example if you have 5% differential it might not affect you much but go up to larger values like 15-20% it comes in spades.

I helped a guy a couple years ago in Atlanta with a 33% IMAC model. The instructions called for a full 2 degree more down aileron than up aileron. At this the model would roll pretty good. But if the speed was higher or was lower than when we did the test...the model's differential was off slightly. We did the 45 degree up test with the 1/2 rolls. Then did vertical rolls once it was close to fine tune it.

Then this guys wife made a mistake and drove over his wings while they sat in the wing bags behind the truck at the flying field. SO after the divorce and planning for the manslaughter

he built new wings out of foam and balsa. Same airfoils, same wing essentially.... and by the way they were lighter than the composite versions. The ailerons were the same..only difference was the ailerons were center hinged. The result was the model needed 1 deg less down than up of differential instead of the 2 degs more down from before and was less speed sensative with regards to differential. This was a swing of 3 degs....And the model rolled the same basically. Other than the speed sensative issue.

Just some food for thought as you improve the way your model performs.

Troy