A Mid-70’s engine question.

A TD runs just as good on a tank as it does on pressure. The problem is knowing how to setup the tank correctly. You also can't run a large heavier pitched prop using pressure. Running a bladder doesn't like a load. What Tom did was turn the engine into a tractor vs a Ferrari. Tom has done some mods to larger engines such as the FP .40 making claims that it runs better than true manufactured stunt engines. I've witnessed them run and I thought they were under powered and ran terribly. Articles written today are no different than years back. Editors will take anything and write about it due to a lack of material to write about. Just because it's in the magazines doesn't mean it worked. Believe what you've experienced. I should also add, the best stunt engines are the most under powered engines. This is what makes the LA engines a good stunt engine. He detuned the engine and overloaded the engine with too much prop. That was the thinking back then. Kinda of like a lugging Super Tiger .60 run. It really doesn't work all that well with smaller engines and it's better to run less pitch and more rpm's to keep it flying at the correct speed then it is to lug it.

I picked up a ready to fly plane at a swap meet that had a TD with a single bypass cylinder. Kind of an oldtimer parasol plane. The older owner said it was too much with the twin bypass. I suppose it would be more suited to a reedy or Medallian as mentioned before. Glad I didn't pay too much because I really don't like using the single bypass cylinders even on the reedies.