To All:
The new free RASAero II software has been released! It is available for
download from the RASAero web site at _www.rasaero.com_
(http://www.rasaero.com) , click on the RASAero II Software and RASAero II
Users Manual buttons
to access the web pages to download the software and the users manual.
The big new features are new and improved supersonic Center of Pressure
(CP) models, the ability to run multi-stage rockets, and the ability to import
RockSim files. There are many other improved models, including improved
boattail drag models, and other new features listed below.
For those who have run RASAero, running RASAero II is pretty intuitive.
One change is the location of the motor selection, weight, CG, and nozzle
exit diameter inputs; see pages 75-80 of the users manual.
As always the RASAero II authors, Chuck Rogers and David "Coop" Cooper, are
always looking for flight data to compare the RASAero II altitude
predictions against to further develop and improve the RASAero II aerodynamic
prediction and altitude prediction models.
Chuck Rogers
Rogers Aeroscience
RASAero II
Version 1.0.0.0 – Release Date September 12, 2015
New and improved models and capabilities compared to the RASAero software:
* New and improved supersonic Center of Pressure (CP) models. Rocket
supersonic CP typically moved forward approximately 1 caliber compared to
previous RASAero models. For supersonic stability should run RASAero II
software rather than RASAero software.
* New multi-stage capability for aerodynamic predictions and for
flight simulations. RASAero II software can run rockets with up to 3 stages.
* User-specified booster separation delay and upper stage ignition
delay for delayed staging, or coast before ignition of upper stage.
* Ability to import RockSim .rkt rocket files directly into RASAero
II.
* New and improved dynamic stability models.
* New and improved transonic CD models.
* New and improved supersonic boattail wave drag and base drag models
for increased altitude prediction accuracy for rockets with boattails.
* For very steep or very short boattails, new flight data-based
boattail wave drag and base drag models which eliminate unrealistically high
altitude predictions for very steep or very short boattails.
* Added power law, LV-Haack, parabolic and elliptical nose cones,
including subsonic, supersonic, and hypersonic CD, Cnalpha and CP models for
the new nose cones.
* Added the capability for 5, 6, 7 and 8 fins, to the existing 3 and
4 fins.
* Added improved viscous crossflow models to the Rogers Modified
Barrowman Method and the supersonic body CP methods for improved predictions
for the forward movement of the rocket CP with angle of attack.
* Added improved, increased accuracy launch shoe subsonic,
supersonic, and hypersonic CD models.
* Added new and improved square airfoil leading edge wave drag model.
* Made corrections to square airfoil and rounded airfoil friction
drag models for all turbulent flow.
* Rocket reference area changed from base area of the nose cone to
the maximum cross-sectional area of the rocket body.
* Updated the rasp.eng motor database file with new motor data for
TRA/NAR/CAR certified motors.
