Mr Bains you know I have been on a diet and haven't eaten "long chips" in ages!!!! ZU-OLY nearly there. Manfred hopes to finish all fettling by Wednesday 16th and Legair refitting engine 22nd (anniversary of original collection from George).Gary or Sean to do the test flight and the all systems go to bang in the circuits between Christmas and New Year If you ask Santa nicely maybe, just maybe, you can get extensions to those short stubby wings of yours??????
By adding fixed tabs to both ailerons (deflected upwards) it is possible to change the "feel" of the ailerons. Being an under cambered wing section there is a lot of upload on the ailerons in flight. The ailerons have a 2:1 differential throw meaning that the up going aileron has twice the mechanical advantage of the down going aileron and hence over powers it. This can result in a "dead" feel to the ailerons (it varies between aircraft depending on the exact bellcrank adjustment etc). On the Express the tabs definitely make the ailerons feel more normal (spring back to neutral) and reduces friction by lessening compressive load in pushrods and hence friction in the bushes. On the mglider one can also tweak the feel by using tabs. I recently added tabs to ZU-FDI. I started with tabs 1300 long and about 35mm wide. This gave a lot of "spring back" (centering effect). I progressively trimmed them until I was happy with the feel (about 25mm). We have a mould to make lightweight fibreglass tabs of a suitable angle and stiffness which you can either rivet on or bond on. Remember that mass must be kept to a minimum and the max residual momemt as per the manual must be adhered to.
Thanks Russell, I will install aluminium tabs tomorrow and bend them till the ailerons feel right, and then make a pair with fibreglass If I fail to get them right I will ask you to make me a pair. I think maybe my bellcrank needs adjustment too.