Well, im very new to the hobby, and im trying to pick up as much info here as possible before i even visit a field(which i plan on doing very soon). I actually dont even have my model yet, but while i wait for it on order, this is how im seeing how its done. My question is to do with the recommended engine size for the model. I have on order, for my first trainer, a SIG Kadet MKII. I was told it is an excellent plane for learning the basics of RC flight, and that its a good BIY starter for getting the hang of building from a kit. So, that said, the largest size of engine stated for that model is any between .25-.40. I want to know if it will work if i put something like a TT Pro.46 or an O.S.-46AX. Or is .40 the max. size for that plane?.

The Kadet will fly beautifully with any of your mentioned engines. I have found the LA.46 is about ideal but if you can afford it go with one of the ball bearing .46 sized engines, the OS.46AX if a great example. You will enjoy learning with the combo and be ready for the next plane also.

I agree, go with one of the two you mentioned. It won't be too much for the LT40 and you'll be glad you have the good engine when you're ready to move up

A good quallity .46 will work great. I would personally recommend the Thunder Tiger .46 Pro, or the O.S .46AX would be good to if you want to spend a little more. As a beginner you want an engine that is very dependable That way when you are ready to move up to a .40 size sport Aircraft you will have a good engine that will move up with you. The O.S .46 LA's are probally one of the most dependable, but are a little weak on Power when you decide to move up, but they would also work fine. Prop selection is also critical for that first Plane, and I would recommend an APC 11x5 Prop on any of those engines mentioned. The 10x6 is Fine also, but the 11X5 will slow the Plane down a bit for you, and give you a little extra Power to help get out of Trouble if you need to. The 11x5 will also help you get your airspeed down faster when comming in for those first landings. Good Luck on your new Plane. I have built the Sig Kadet MKII, and they are a very good kit for the first time builder. Just follow the instructions well, and you won't have much trouble at all.
Ray

I second the TT or OS 46... I do like the extra power, IMO with
throttle management it can only help you in those times when
extra power is needed:-) Plus it can move on to your next plane:-)

Go with a USER FRIENDLY BALL BEARING 46 engine.

The cost difference between a bushed bearing engine (OS LA series, Thunder Tiger GP series) and a ball bearing engine is not that great.

For user friendly engines I can highly recommend OS FX/AX, Thunder Tiger PRO and the Evolution engines. By user friendly, I mean that 99%+ of the engines will run great right out of the box. There are a lot of good engines out there, however, many of them require a "bit of fiddling with" to get to run properly. This "fiddiling" can be discouraging to a newcomer who would rather be flying than playing mechanic/tune up specialist.

I will second all 3 that Campy mentioned

Thank you all for the input. I will most likely try to get ahold of one of the two forementioned engines. I was just a little curious as to the sizing for RC airplane engines. Its kind of like a "caliber" size more than anything. I will be looking to all of you smarties/pros for knowledge as i go along here. Its such a great resource to have for all hobbyists alike. Peace---Nathaniel

By the way go to the hardware store and buy all the sandpaper and knife blades they have. Your gonna need them. The Mark 2 is a great airplane. But it is an old fashioned kit. Lots of whittling and sanding. If you like building you will love this kit. It's a great flier.

I would suggest the TT just because it would be a perfect match to the MK II. The others will work as well.

Mark Shuman

The size actually refers to the cubic displacement of the engine.

a "46" engine has a .46 (Point fortysix) cubic inch displacement.

Yeah...i knew that already, but i meant more in terms of the stated size. Eg: a 30caliber rifle could be a 30.06, .308, 30.30,....etc..that kind of deal. So a kit requiring a .40 engine, could use .40 or .46 etc...right..? Or am i completely off still?[] Oh well..as long as you guys say i can use a .46 in my MKII, i will. Theres so much to learn, so little brain space to learn it all. Hehe. Well, once again, thanks for all info. Peace---Nathaniel