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I am trying to learn NDARC without any guidance and it has been very overwhelming. Is anybody familiar with the program?

What I have basically understood from what I have read is that one may define the aircraft components (wings, fuselage, number of rotors, etc) and assign parameters associated with the components such as geometry and loadings. Missions may also be assigned to analyze the performance of the aircraft. An executable file is ran and it returns an output file.

Anyone who is familiar with the program I have a few questions:

1. Is NDARC capable of sizing an aircraft? Or does it only analyze the aircraft performance?

2. Only inputs that wish to be changed from the default are defined in the AIRC file. What outputs does NDARC return? Is there an output dictionary or manual? It be good to know which inputs affect which outputs or just in general what outputs will be defined in the output file.

3. I would like to define a helicopter with a Gross Weight of 7,000 lbs and a rotor radius of 18 ft. I would like to know what the power required to hover is. I have changed the DGW input variable to 7,000lbs and the rotor radius to 18 ft using the helicopter example provided in NDARC's wiki site. Those are the only two input variables I changed. However, when I run the executable file, in the Flight State Missions 1-5 I keep getting a gross weight higher than what I defined (closer to 13,000 lbs, very far from the 7,000 lbs I defined). Why is this higher weight being returned? My power required from NDARC is about 1700 hp, which is also higher than what I expected from my hand calculations.

I have attached the ndarc files.

Thanks to anybody that can help me in understanding this software.


As a disclaimer I am not familiar with this program but if I were trying to learn it I might start with:

NASA/TP-2009-215402, ARC-E-DAA-TN762

Which are publicly available through the NTRS. Just something to read through if you haven't already.

Keep em' Flying
//Fight Corrosion!

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