Lou,

Yes, that's what I said.

Also, it's not running diesel on glow sized props that breaks things, necessarily. Just the higher compression ratio required to light off the fuel in a diesel engine, regardless of prop size is what can over stress some glow designed parts. Plus, the stronger punch when that kerosene lights off adds to the loads. Larger props have more mass and inertia for the combustion event to overcome. It all adds up.

The larger Norvels, .15 and up, have pretty massive cranks in comparison to some others. No way you'd break one of those cranks. BUT, those skinny, dogbone rods are prone to bending unless you're very careful. More care is needed, compared to when you run them on glow.

I did break the crank pin off of one of the .15s. But that happened to be on glow and it broke while it was running. Just a fluke, a bad part that got past the QC guys.

I just got one of the stronger, heavy duty, TD cranks from Stewart, from Downunder and I'm very much impressed. LOTS of counterweight with a drilled out pin and it looks more like a crank should. I've broken TD cranks on diesel running 8 x 4s. This one looks like it'll hold up just fine. It has a hair larger shaft diameter than the Brodak/CS and this will be ideal for turning one of those into a light and powerful diesel. The stock cranks kept breaking when run on diesel. No reflection on the engine per se as just like Cox, they were designed to run on glow.

So there. [X(]