I to am saddened to hear of Harry's passing. When I worked for World Engines in the 70's I would see Harry around the shop and we flew contest together. I learned so much about  engines from Harry. I remember when he went to work for Emerson making the Glo Bee plugs. He asked me to try one and guaranteed me at least 200 more RPM. I put one in my OS .60 and sure enough 200 more RPM. I used them forever after that (still have some...he would give me handfuls all the time!) He also gave me the Fire Plug starter battery that you could vary the voltage to the plug (still have it). His RoGo fuel was way ahead of it's time with the use of synthetic oil. I never had an engine failure with his fuel.  Like Tony said he was an excellent pattern coach and told it like it was. I respected his opinion. I always enjoyed hearing his WW II airplane stories. Our thoughts and prayers are with his family. God speed my friend.
Mark