Roger Wensley Posted March 2, 2017 Share Posted March 2, 2017 Anyone know which bits to twiddle in the cfg to increase the cruise speed of a Supercub to better match the actual cruise speed of a newly-made Cubcrafters Supercub? It is surely more than just increasing the horse power? Link to comment Share on other sites More sharing options...
tiger1962 Posted March 2, 2017 Share Posted March 2, 2017 If you have AirEd by William Roth, open the .air file and go to section 1101 Primary Aerodynamics. Scroll down to the drag section, the first item is: *Cdo Drag Coefficient - Zero Lift= Whatever number follows the equals symbol, reduce it by 5 for example and test the cruise speed again. You can reduce or increase further in single units until you have reached your desired cruise speed/throttle position/engine rpm. Tim Wright "The older I get, the better I was..." Xbox Series X, Asus Prime H510M-K, Intel Core i5-11400F 4.40GHz, 16Gb DDR4 3200, 2TB WD Black NVME SSD, 1TB Samsung SATA SSD NVidia RTX3060 Ti 8Gb, Logitech Flight Yoke System, CH Pro Pedals, Acer K272HL 27", Windows 11 Home x64 Link to comment Share on other sites More sharing options...
Roger Wensley Posted March 2, 2017 Author Share Posted March 2, 2017 Thanks for that tiger Link to comment Share on other sites More sharing options...
Roger Wensley Posted March 3, 2017 Author Share Posted March 3, 2017 It doesn't appear to work, but I will try further reduction. Maybe also increase rpm limit? Link to comment Share on other sites More sharing options...
Roger Wensley Posted March 3, 2017 Author Share Posted March 3, 2017 That seems to be the way to go, minor (10%) changes to parasite drag (down) and power scalar and thrust scalar (up) so that there aren't huge knock-on effects to other aspects. Link to comment Share on other sites More sharing options...
nadlzfw Posted March 3, 2017 Share Posted March 3, 2017 Actually I disagree... I have no fear of editing the aircraft.cfg, as long as prior values are backed up. I would consider, in this order: *verify that empty weight is about right. *try to reduce prop pitch angle (assumes a fixed pitch prop) to cruise at slightly more rpm. Or, reduce prop diameter to accomplish the same. *Increase value for cruise_lift_scalar=xxx *reduce parasite drag, as mentioned above. Nadlzfw Link to comment Share on other sites More sharing options...
Roger Wensley Posted March 3, 2017 Author Share Posted March 3, 2017 You could be right, but as making the three changes worked as needed I will stay with those. Link to comment Share on other sites More sharing options...
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