I am a member of a newly founded rocketry team in my University. We are very excited to build our first rocket, however, we have no prior knowledge. Upon investigating different methods for Dual Deployment Systems, Theo W. Knacke in his book "Parachute Recovery System Design Manual" mentions a recovery system by means of a rocket with angled nozzles located at the nosecone.
We found this to be very interesting and I personally did not find a anyone tring to achieve this. I found that the DARE project at TU Delft considered this approach back in 2019, explaining that despite having many potential benefits, testing was too complicated. Our rocket will deploy a drogue and the main bag housing the main parachute alltogether (I believe this approach is called "In-Line" but please correct me if I am wrong). Thanks to previous posts I understood that the rule of thumb is to eject the drogue parachute to a length of about 5-6 times the body diameter in order for clean air to inflate the drogue.
I know that this method souds flashy and overly complicated for something that can be easily achieved by a simple pyrotechnic ejection. However, I understand that as rockets get bigger, pyrotechnic extraction is substituted by other approaches like aerodynamic extraction of a drogue parachute with a pilot chute, or even pistons or mortar style deployments. These either requiere the rocket to have a certainly speed to work or a heavy supporting structure to enable the deployments. If the objective is to minimize weight and for the deployment to occur as far and as close at apogee as possible, wouldn't this Rocket Extraction method be very practical?
I would love to know your opinion. Thank you!
We found this to be very interesting and I personally did not find a anyone tring to achieve this. I found that the DARE project at TU Delft considered this approach back in 2019, explaining that despite having many potential benefits, testing was too complicated. Our rocket will deploy a drogue and the main bag housing the main parachute alltogether (I believe this approach is called "In-Line" but please correct me if I am wrong). Thanks to previous posts I understood that the rule of thumb is to eject the drogue parachute to a length of about 5-6 times the body diameter in order for clean air to inflate the drogue.
I know that this method souds flashy and overly complicated for something that can be easily achieved by a simple pyrotechnic ejection. However, I understand that as rockets get bigger, pyrotechnic extraction is substituted by other approaches like aerodynamic extraction of a drogue parachute with a pilot chute, or even pistons or mortar style deployments. These either requiere the rocket to have a certainly speed to work or a heavy supporting structure to enable the deployments. If the objective is to minimize weight and for the deployment to occur as far and as close at apogee as possible, wouldn't this Rocket Extraction method be very practical?
I would love to know your opinion. Thank you!