I'm getting ready to purchase my second plane and need a .60 - .75 2-stroke engine. I would like to go with a .75, but OS and Thunder Tiger, the only engines that have been recommended to me so far, don't have any in the .70 range. I was wondering if I could get some suggestions of other manufactures I could use (or shouldn't use). I found a Tower Hobbies .75 BB ABC for $99.99; is this a reliable brand?

If it helps, I'm getting the Sig 4 Star 60.

AdmiralHam,

I flew mine on an OS .61FX had plenty of power, but I wasn't trying to 3D it. Most of the time I flew at half throttle as it was my first low wing. I would rather have the O.S. than the Tower.

If you want a .75 how about an Irving .72. Quantum has them for $152.99.

John

There's been some pretty good magazine reviews written about Tower's engines, but I've never owned one. You can't go wrong with an OS .61FX on that 4*60.

The tower is a good engine. I have one and it is very reliable. If you are going with the Fx, you should get the .91. It is in the same case as the .61 and it is way more powerful. The .61 fx is the weak fx, even less powerful than the .65 la. You might want to try the magnum xls .91, almost identical to the O.S. It is around $150.

I'm trying to make the choice based off my limited experience; my trainer was designed to fly with a .40 - .46 engine. I have a .46 and a guy at the field, who has the same trainer, has a .40 and there's a huge performane difference between our two planes. The Sig 4 Star 60 will be my second plane, which according to Sig runs with a .60 - .75 engine. Following what little I have seen, I think I want an engine in the upper range. Is that reasonable or am I over-thinking . . . again?

Would the OS .91 be an acceptable engine for this plane? With so little experience, I have a tendency to follow the manf. recommendations a little too literaly so I didn't even consider going to a larger engine.

AdmiralHam,

If this is going to be your 2nd plane do yourself a favor. Buy the O.S. as it is bullet proof. You'll have more than enough vertical and the full throttle performance will be all you can handle. At least it was for me. The .61 in the 4 Star 60 is a good choice.

John

Stick with the .61FX in lieu of the .91FX. True, the .91 is the same physical size and weight of the .61, but it will burn more fuel and tends to overheat from a lean setting quite easily. I have an OS .61FX on a 1/4 scale Spacewalker that weighs 8 1/2 lbs. and I don't see where it's a weak engine at all.

Okay, then it's the OS .61 FX for my Sig 4 Star 60. Thanks for the info!