The K&B 61 is the exception to the heavy rule. As noted in an earlier post, its weight is on a par with most 40-46 engines, and it's considerably more powerful.

An excellent engine choice for any 40-46 plane you want to make faster/sportier.

One example is my Diablo 40. With the K&B ringed 61 installed it will take off vertically from my hand.

And it's almost impossible to hurt it.

Bill.

PS: As you can see, it makes a neat installation. wr.