ULTIMATE LOAD TEST
We carry out an ultimate load test to check the strength of the Eclipson Model Y´wing
Our theoretical stress analysis has already indicated that the strength of the wing would be greater than ±8G, but the result of this test was better than we expected.
We discovered early on that there is one critical point from the stress point of view in a 3D printed airplane - the joins between parts.
After a extensive research and testing we have decided to use a "male - female" system to join the parts.
Thanks to this join system, the strength is increased and in addition it is easier to assemble the parts.
As you can see in this test a crack starts at the middle of the lower wing area. At this point, the tension of the material is at maximum reaching a limit of around 40 MPa for PLA. Thanks to our optimized design in this area there are no joins.
Aerobatic with Model Y
According to the Federal Aviation regulations an aerobatic aircraft should at least cope with stress levels of -3 G and +6G. Therefore you will be able to perform aerobatics with this plane without an issue.
There are many situations where an airplane would be exposed to high load factors. The most extreme situations occur during aerobatic manoeuvres, but you don’t need to pull aerobatics to increase the load factor of your airplane. A common situation such as a turn will increase the load factor.
How? - Load factor is the relationship between lift and weight.
During level flight, the lift is equal to the weight, the load factor at this time will be 1G, but when you begin to turn without losing altitude the lift will be greater than the weight, and this extra lift is the force that will allow you to turn, but of course this increases the load factor.