03-12-2021, 09:03 AM
(03-07-2021, 04:32 PM)Grumpy Goat Wrote:(03-07-2021, 02:42 PM)OerTheHill Wrote: Over about 60 mph I get this weird sort of higher pitched hum, which immediately stops when I turn my Schuberth helmet more than 45 degrees to one side or another.
Maybe it is the helmet itself. The projected area of the helmet is different for the frontal projection vs the oblique projection, and at all points in between so I am not at all surprised that you get different sounds when rotating your head. I think that wind coming off the windscreen could be another contributory factor. I also have a naked bike with no to little windscreen and my helmet makes different sounds front to side.
The plot thickens! Using a CamRack which attaches to the windscreen, I mounted a GoPro and, for extra power, ran a wire from the camera, up behind the windscreen--over the brace, and to a PowerBank in my tankbag. Not only do I get 8 hours of video shooting but the noise went away! So, yes, I think the specific airflow off of the Wunderlich windscreen, hitting the helmet, was disrupted enough to stop the noise. Need to test more.
By the way, for a second thread, GoPros and camera mounts. The CamRack sold by Wunderlich is a beautifully crafted mount, but if one tries to use the HyperSmooth feature of the GoPro without part of the motorcycle being in frame for reference, really weird things happen to the video!