After an initial successful flight to prove the wings would stay on and the plane doesn't generally disintegrate in flight we've been able to fly the MkII again and are happy with the results.
We wanted to test two things:
Check out our video of the MkII in flight below...
It was our plan to test this in flight but unfortunately we weren't able to do this as in our last flight we snapped our motor shaft (which holds the propeller) from the plane which means we'll have to fix this before more flying (and add some landing gear!).
Fortunately, we did take some readings on the ground at approximately 50% throttle (which keeps the plane level). Peter at Peersonic has kindly provided us with a new microphone to test which discriminates against 8kHz and below. We tested the new and standard mics at the full fuselage extension with the mic facing perpendicular to the fuselage.
What do the results tell us?
We can compare these two recordings with audio from the previous plane model. In this image we have the images above on the left and right respectively and a recording from the previous plane in the centre. Clearly the new plane design reduces the amount of noise by putting more distance between the microphone and propeller.
Hopefully with this new setup we'll have more chance of spotting bat calls in our sonograms. Real world testing to follow!