that would be a 27p temepst worked to a 28p and THINNED! same kinda work we in the biz do! but we do it much cheaper!
cept i don't like thinning the entire blade like they do.
so does that mean the prop can't be worked to a 29p because it's a 27p originally.
can only safely change pitch 1 deg. mercury already makes a 29 tempest, but it has a different blade profile than the others. more similar to the 26 tempest.
yes, a 25,27 tempest are different profiles than the 26 and 29 tempest.