"Let us know of the results of your investigations, Orma, I'd be interested to know whether yours is unique or whether there are others out there marketed under some name."
Earlier today I made a simple measurement with string around the prop hub and around the diameter of the #4 bearing, and they were approximately the same. Tomorrow I will use the real tool. As to other engines, I would guess that there were others. Attrition has probably removed a lot of them from service. Because there are no real accurate records as to how many or which engines were installed, it would be anyone's guess. Also there were a few different engine makers of the day. Another point is that the use of the type 4 was never in the main stream. You will note that I have not mentioned the name, and that is because I have no proof that this person actually assembled this engine, only the hear say of others. Orma L. Robbins Southfield MI 19 Years flying KR-2 N110LR http://www.aviation-mechanics.com
