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ENH: New nosecone types added. #339

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merged 1 commit into from
Mar 16, 2023
Merged

ENH: New nosecone types added. #339

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16 changes: 14 additions & 2 deletions rocketpy/AeroSurfaces.py
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Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,8 @@ def __init__(
length : float
Nose cone length. Has units of length and must be given in meters.
kind : string
Nose cone kind. Can be "conical", "ogive" or "lvhaack".
Nose cone kind. Can be "conical", "ogive", "elliptical", "tangent",
"von karman", "parabolic" or "lvhaack".
baseRadius : float, optional
Nose cone base radius. Has units of length and must be given in meters.
If not given, the ratio between baseRadius and rocketRadius will be
Expand Down Expand Up @@ -162,8 +163,19 @@ def kind(self, value):
self.k = 0.466
elif value == "lvhaack":
self.k = 0.563
elif value == "tangent":
rho = (self.baseRadius**2 + self.length**2) / (2 * self.baseRadius)
volume = np.pi * (
self.length * rho**2
- (self.length**3) / 3
- (rho - self.baseRadius) * rho**2 * np.arcsin(self.length / rho)
)
area = np.pi * self.baseRadius**2
self.k = 1 - volume / (area * self.length)
elif value == "elliptical":
self.k = 1 / 3
else:
self.k = 0.5
self.k = 0.5 # Parabolic and Von Karman
self.evaluateCenterOfPressure()

def evaluateGeometricalParameters(self):
Expand Down