- Jan 29, 2008
- Germantown, WI USA
Short answer-------------- YESSome tanks(the Sherman?) in WW2 used Continental 670 radials. Mr Bob(cropduster/IA/Stearman restorer/ag service) got an STC for converting those for a prop and used em on Stearman dusters for decades. He found a machine shop in Memphis that could do the critical work of machining/installing the hubs. There was a huge stack of crates in the hangar containing surplus 670s. I ran across a Grenada Air Service STC data plate that came off one of those motors at Air Repair in Cleveland MS. I tried to buy it..."nope, not for sale". It was obvious that conversation was over. It was the standard SS plate but with dark green background...military looking(Mr Bob was a B24 mech). I'd love to have that plate on my wall.
I'm gettin all nostalgic again Pops. Does that mean we're gettin old?
One day I flew in formation for a while with a Kite with a 3 Cyl Suzuki engine and that engine really performed. He bought it out of a junk yard and converted it himself. I was impressed. I was flying my SSSC.I'll tell what I think of the other side of auto conversion's. I made the mistake of thinking a engine was developed and all bug's where worked out so I bought the conversion manual and started wrenching away (CORVAIR) After crank issues, and a number of upgrades discovered by the authority to better the engine I had a motor that was not up to risk management standards. Later I came to learn that it's not so much the engine but the RPM needed for the prop. Many engines in the auto seen need a PRU to get the right RPM for the prop and I've had a supplier say that control of the RPM can be handled by the throttle and this does make since to me other then you can not get Max power without Max RPM of what ever engine your converting. Weight of auto engine's is a back draw and the supply of older core's is a on coming issue. Money for the engine is another area that hurt's builder's and GA owners, A person can go to a local junk yard and by a 3 cyl Suzuki engine for around $400.00. I to this day don't see wy a 400.00 engine end's up costing $8500.00 to be ready to bolt to your plane?