This is not the folding, rather the feathering, very similar in appearance to the Maxprops. I have also the folding Martec, and have experienced the same issues you talk about. They are good performers, but I have always had a bit of vibration with them. I have owned 4 different boats all with Martec folding props in sizes from 14" to 18". My current is a 16"14P on my J/34c.
Jboat J/37c (new to me Jan 2011); J/22 #1003
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