Thanks to Andy2No for inspiration I've added an extra wing to my PZ sukhoi. This has pretty much doubled the wing area, I hope the tail surfaces are big enough.
I used 2mm depron for the wing and 3mm for the struts all held together with por. I deliberately moved the centre of lift forward to try and address the CG problem but now I've got to guess where to put the CG.
The weight has gone up to 35.7 gr giving a wing loading of 2.1 oz/sq ft which is in line with my other indoor models
Haven't flown it yet as its blowing a gale outside and the next indoor session isnt till Wednesday
So Thanks Andy I'll let you know how it flies
Remember to mostly stear with the ruddder, and level up with the ailerons. Rudder and ailerons together going into a turn, then a bit of opposite ailerons to level up works okay. I let someone else try it once and he flew it straight into a wall, banked over but not turning, because he was used to steering just with ailerons.
Finding the CG is just a question of trial and error. Having a smooth floor to take off from makes it a lot easier - you can start nose heavy and see how much "up" is needed to get it to take off. it shouldn't be much. If it's a lot just land straight away and move the battery further back.
I fllew mine at the Manchester Velodrome yesterday. It's the first time I've been there. I saw a white UM SU-26 with a longer battery slot than mine. I didn't realise they'd changed it. The battery slot on mine goes about half way from the leading edge to the trailng edge. His was the full length of the chord, and apparently it came like that.
My upper wing is a slightly different shape, and my preference for where to have the CG might be different too, but with a standard 138mAh Parkzone lipo, the back end of the battery was probably about level with the trailing edge - on some extra velcro stuck onto the fuselage, with the black plastic bit overlapping the back end of the slot. On the newer one, with the full length slot, it would be almost all the way to the back, I think. I've put it back in the big pile of boxes now, so I'm going on memory. I've had it further back and it was still just about manageable. It can go further forward but it seems to need to fly faster if it's nose heavy.
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