I'm looking at building a trainer (my first) and wanted to put a .40 size engine in it. What are some good one?

Thanks

Personal preference, OS 46ax. You won't be sorry while flying the trainer and have a good motor when you step up to something more advanced.

G'day Mate,
I wholeheartedly support Moto-X's endorsment of the OS 46AX, ya can't go wrong, don't go for cheap, it will cost ya in frustration, in the long run.

for your 115.$$ the OS 46AX great engine for your $ and performance

now if money is a little tighter you could go with an evo .46nt, yes its not the most prefromance bassed engine but it is VERY easy to start and tune


http://www.horizonhobby.com/Products...rodID=EVOE0460

OS engine quality is decent I can't disagree with that, BUT they are overpriced in my opinion. A fourty size engine, even a ball bering engine, shouldn't cost over a hundred bucks. I would look into the Tower Hobbies engines. If you treat them right (as you have to do with any engine) they are as good as the OS engines. If you want real quality buy a Jett, but it'll cost you about $300 bucks.

Tower .46 ball bearing - 1.75 HP/ 16.9oz. $79.99
OS .46AX 1.65 HP/ 17.2oz. $109.99

I know which one I would buy.

Darren

I buy my OS 46ax's at

KC Hobby in Archdale N.C. for $95 plus $8 shipping
Ask for Matt

336-434-3482


Ronnie

Hi!
An OS.40 or .46 LA and a 11x5 or 11x6 APC prop is is a good choice if you fly at sea-level... OS 46 AX is not!

It might help to get specific: I fly a Goldberg Eagle 2 with the OS 46AX. Yes, this is more power than the plane needs to fly well. BUT: The extra power is a plus on takeoffs as there is more than you need to be SURE you get off the ground safely even when your takeoff roll is not as neat as you'd like. Also, once I reach the altitude I want I throttle back and do not fly at over about half throttle (I just soloed last week and am not ready to fly faster in most cases).
As I learned from 25 years of riding motorcycles: It's better to have "too much power" and generally not use it than "too little" and then suddenly need it.

The 46AX is a great motor and as other have noted, will allow you plenty of growth with the trainer as well as the ability to move it to another plane later

Personally i don't like O.S all that much. They just cost way to much for what you really get and the last best engine I've seen them produce is the FSR and since then i think there qualities dropped because they've made them selves a name. But anyways thats my opinion.

If you want a VERY versatile engine id suggest a TT46 Pro for beginning. I never thought of a Thunder tiger when i was beginning but now that I've owned the 46 pro it think its the best engine for doing anything after your trainer. Example i have the 46 tt Pro and it was just recently clocked pulling a Mach racer at 112 mph. It has excellent throttle work and just before being a speed engine it flew my uproar doing nearly every 3d maneuver i was capable of pulling off. A very simple and versatile engine.

But for pure power i still love supertigre's because my 51 ring will kick any O.S 46 ax butt out at my field and they are very cheap with great service and warranty. I sent mine in for, well unfortunately damage i did to it and they sent me back an entirely new engine. Plus they are serviced right at tower.

So what id suggest is either a Supertigre 51 ring or a Thunder Tiger 46 pro. The Super tigre 45 is very powerful too. It's actually got more power than the 51 because its not ringed. I have seen all these in trainers and all worked great. Ofcourse ive seen plenty of Os engines work great too.

1 warning about the tower 46. It is know to have a lot of problems. Tower is very good at switching you engines but its still time consuming waiting on a engine that will work just right for you. The tower 75 is probably the fastest strongest engine around though. Right behind some pylon engines and ofcourse Jett engines! But tower has some issues yet with their 46.IMHO

Have fun with the Hobby and welcome!

Darion

The only problems I've seen with the Tower .46 is ignorance and operator error. If you read and follow the instructions you won't have a problem. Had a new flier at our field that couldn't get his Tower .46. running. He couldn't unerstand why as " it ran on the test stand". Turns out he disassembled and cleaned the engine post break in and didn't reinstall the O ring at the carb/ case interface. Put an O ring on it and it ran like a champ. I also like the TT engines.

Darren

Its just what I've heard from others and the problems me and my dad had trying to run his up. We went exactly be the instruction manual and even called tower for help while running it. It was just a bad engine to start with. I've also heard the same problems from others. Some people have great luck with them. I just haven't yet i guess.

I ended up getting the os .46 ax thanks guys!

A great little engine, but be sure to reinforce your firewall and fiberglass the center section of your wing on a trainer if you ever decide to run the engine full throttle.

It's entirely possible to re-kit a trainer in mid-air with that engine.


Ronnie

The most user friendly 40 sized engines would have been the plain bearing OS LA 40 (or 46) or perhaps the Evolution engines.

I fly the Sig Kadet LT-40 which my son and I built from the kit. It is larger than the prototypical 40 sized trainers (900 sq in of wing area) so I went with a ball bearing Thunder Tiger 46 Pro. It is a durable, well running engine with ample power but a bit more finicky to properly set up a reliable idle.