ORIGINAL: Mike Connor
This should be interesting. I predict the speed will stay the same or be slower with the 7" prop. I think the Dust with everything hanging out needs a larger diameter prop.
Hopefully, I will be able to find out this weekend. In theory, with less drag than the "fat factory thick" wing, I should be able to get away with less diameter. My last test with the "modifed" 7.2 X 9 prop, the GRRT would not stay on the pipe for more than 7 or 8 seconds. I will try shaving it down to a 7" and see if stays on the pipe.