Effects of size and speed on model airplane crashes

In summary, the conversation discusses the search for an equation that relates material failure and collision speed in order to understand the effects of size and speed on model airplane crashes. Several factors, such as specific strength, mass, and flexibility, are mentioned as potentially influencing the equation. The idea of using energy and structural flexibility to determine the "stopping distance" and resulting impact forces is also brought up. Additionally, the conversation suggests looking into plastic flow and buckling theory as potential avenues for finding the desired equation.
  • #1
wolfv
1
0
I am looking for an equation that correlates material failure and collision speed;
so that I can better understand the effects of size and speed on model airplane crashes.

Is there an equation that correlates an object's length and speed to material failure,
for one-dimensional elastic collision of into a rigid barrier,
given elastic modulus and specific strength?

This is a guess:
specific strength :: speed^2 * length​
but it's probably more complicated than that.

Thank you.
 
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  • #2
I'm aware of a general rule that says light models bounce but have never seen anyone do a rigorous analysis.

How about looking at the energy..

KE = 0.5mV2

That has to be absorbed by the structure flexing on impact.

Looks like two factors matter.. The mass and the flexibility.

Some modern indoor RC planes are very light and very flexible, their structure can be distorted considerably without breaking so the available "stopping distance" is quite large and the resulting deceleration and impact forces quite low. I'm thinking of planes similar to this that are made of thin carbon fibre rod.

http://www.hobbyexpress.com/images_products/528613_large.jpg
 
  • #3
For plastic flow in 1D, look up the paper by wilkins and guinan on the taylor impact test. My instinct is that you might need to look at bucking theory. Try the book structural impact by jones.
 

1. How does the size of a model airplane affect its likelihood of crashing?

The size of a model airplane can affect its likelihood of crashing in several ways. Generally, larger model airplanes are more stable and have better control, making them less likely to crash. However, larger models also tend to be heavier, which can increase the impact force of a crash and cause more damage. Additionally, larger models require more space to fly, increasing the risk of collisions with obstacles or other aircraft.

2. Does the speed of a model airplane impact its chances of crashing?

Yes, the speed of a model airplane can definitely affect its chances of crashing. Higher speeds can make it more difficult to control the aircraft, especially for inexperienced pilots. Additionally, high speeds can increase the impact force of a crash, causing more damage to the airplane and potentially leading to more severe crashes.

3. How does the weight of a model airplane play a role in crashes?

The weight of a model airplane is a crucial factor in determining its crash likelihood. Heavier models tend to be more stable and have better control, making them less likely to crash. However, as mentioned before, a heavier model also means a greater impact force in the event of a crash, potentially causing more damage.

4. Are there any specific design features that can reduce the effects of size and speed on model airplane crashes?

Yes, there are several design features that can help reduce the effects of size and speed on model airplane crashes. For example, models with larger wingspan tend to have better stability and control, while models with smaller wingspan are more agile and better suited for high-speed flights. Additionally, using lightweight materials and incorporating aerodynamic designs can help reduce the impact force of a crash.

5. Is there a way to predict the likelihood of a model airplane crashing based on its size and speed?

While there is no definitive way to predict the likelihood of a model airplane crashing based on its size and speed, understanding the relationship between these factors can help inform pilots and designers. Generally, larger and heavier models with higher speeds are more likely to experience severe crashes. However, proper training, maintenance, and adherence to safety measures can greatly reduce the risk of crashes regardless of size and speed.

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