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This is a topic discussed a lot and is very well know.
When I saw this occurrence I thought it was very unique and had to share. Some back story, this is was from a flight on my Blackhawk 38.
This is my guess to what happened, it was about 70*f outside. The rocket had 3-4 coats of clear coat, since the rocket lawndarted I could not recover any flight data. But Open Rocket and RasAero predicted 569 ft/s or roughly 380 miles per hour.
So I can imagine as the rocket's velocity increased and reached its maximum, the outside coat on the rocket because soft and pliable.
Then when the rocket lawndarted into the ground, the dirt stuck to the outside of the rocket, according to where the coat became soft. Then nosecone was attached to the upper section with a 2-56 Nylon sheer pin.
As you can see in the picture below the sheer pin there is a void, where the dirt did not stick to the rocket. Demonstrating non-laminar flow, from the sheer pin head.
I stumbled upon this, while cleaning the parts from the rocket. I noticed the upper section had a lot of dirt attached to it, so I stuck it into my bathtub and filled it up with water. After removing the parts I noticed the dirt was not coming off, i even tried a section with a brush. So the dirt actually adhered to the rocket from the clear coat.
I blogged about this, but I figured I would show TRF just to see what everyone has to say.
Any comments? Discussion?
When I saw this occurrence I thought it was very unique and had to share. Some back story, this is was from a flight on my Blackhawk 38.
This is my guess to what happened, it was about 70*f outside. The rocket had 3-4 coats of clear coat, since the rocket lawndarted I could not recover any flight data. But Open Rocket and RasAero predicted 569 ft/s or roughly 380 miles per hour.
So I can imagine as the rocket's velocity increased and reached its maximum, the outside coat on the rocket because soft and pliable.
Then when the rocket lawndarted into the ground, the dirt stuck to the outside of the rocket, according to where the coat became soft. Then nosecone was attached to the upper section with a 2-56 Nylon sheer pin.
As you can see in the picture below the sheer pin there is a void, where the dirt did not stick to the rocket. Demonstrating non-laminar flow, from the sheer pin head.
I stumbled upon this, while cleaning the parts from the rocket. I noticed the upper section had a lot of dirt attached to it, so I stuck it into my bathtub and filled it up with water. After removing the parts I noticed the dirt was not coming off, i even tried a section with a brush. So the dirt actually adhered to the rocket from the clear coat.
I blogged about this, but I figured I would show TRF just to see what everyone has to say.
Any comments? Discussion?