Does any one know the difference between the old P/A 40 pipe version and the new P/A 40 merlin beside size? Can the old pipe version be run with a header muffler instead of pipe?
HI Larry
The PA 40 is the same size case and mount diminsions as the 51,61.65.
They can all be interchanged, with each other. And ALL PA engines run very well on a pipe or muffler.
The new Merlin series PA ultra lite 40 is a much smaller size case and will go into many classic airplanes as well as modern stunt ships.
It is more the size of a 35 engine.
Weigh about the same as an Aero Tiger or Magnum 32 36 (8.)
The PA 40 Ultra lite has the same mounts as an older ST 35 40 46, but is longer on the nose. this allows you to make a very sleek cowl without using a prop shaft extention
Regards
Randy