Piper Supercub cruise speed

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?

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.

Thanks for that tiger

It doesn't appear to work, but I will try further reduction. Maybe also increase rpm limit?

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.

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

You could be right, but as making the three changes worked as needed I will stay with those.