I am looking for a really good performing 40 to 50 size engine, or even a 60 size if the weight is low enough. I have no experience with this size so I have no idea which engine is "BEST".

I have thought about getting the OS 50 SX what are your thoughts?

Jeff

Jeff,

Depending on what kind of money you want to spend and how much power you need, there's no engine's out there that can come even close to a Jett engine. Check out his .46, .50, and .60L (same case as a .40) with Dub at http://www.jettengineering.com/ and you'll find out why. Also, you can read some of Dub's personal comments on each engine to learn more what's best for your application. Hope this help.

Sam

You can't go wrong with an O.S. despite some of the negative comments you'll see about their cylinders. Also, Thunder Tiger, Supertiger, etc. are pretty much all good engines. It depends on what you're going to use it for, how much you want to spend, and PERSONAL preference.

Unforunately there's no such thing as a light 60. Closest thing to one would be the MDS 58 and that weighs a good 4 oz more than 46s from other manufacturers.

IMHO, the 50SX ain't worth it. Put a Tower 46 pipe on a 46FX and you're looking at the same power. Plus it's ringed which means that it'll take longer to break in. Not worth the extra $50...

Within this size/weight range, you're probably best off with a Jett, but if you can't afford it, there are plenty of very good alternatives. Check out the Webra 50, Irvine 53, or MVVS 49. The displacement advantage of these European engines means that all the above will outrun a plain jane Asian 46...

Bad advice from someone with little or no experience with the engines mentioned is a dangerous thing.

I have one of the new OS50SX engines and a friend also has one. They are the best running engines in this size that I have ever seen.

We broke them in with one tank of fuel and have been flying them ever since. They have way more power than the OS46FX engines and are not hard to break in.

I think they are well worth the extra $50.00.

I would go for the OS50SX you wont be sorry!!!!!!!!!

How well will Jett and NELSON engines perform for an aerobatic plane? Aren't these engines more for racing?

Jeff

Jeff,

A Nelson won't do the job for aerobatic because they don't make them, but there are Jett engines that are tuned for low rpm high torgue that can swing big prop. However, a .40-.50 engine for aerobatic plane may not be the right choice for your application. Probably best to use a YS .63 for that size range. Although a Jett .50 will out perform a YS .63 any given day of the week, but it's not the right choice because it will fly your plane too fast, which defeating the purpose for aerobatic flying.

Yes. A Nelson engine were strickly made for racing application, but not all Jett engines are. Dub Jett does make racing engine, but majority of his engine are for sport use and are sold to Sport Flyers. Most people think because he makes racing engine that all of his engines are for racing only, NOT true! However, there are many benefits to buy a Sport Jett engine because it derived from proven records from racing into sport. Like the automotive world from the race track to the street.

Here's an example for those that believe a 2 stroke are only for speed and can only swing itty bitty prop. Well, better think again...
A 2 stroke Jett .120 can swing a 16x8 prop around 9000 rpm and 15x8 around 11000 rpm and will idle at 1200 for the norm. Now, that's impressive! Now, would that one person think a 1.5hp 4 stroke fly better than a 3hp 2 stroke? Hmmm... think not!

Sorry to go of track, but my recommendation was based on your post for POWER, and if power was your main concern then by all mean the Jett engine fits it like a glove. There was never anything mention for aerobatic application.

Sam

All except for the K&B .61 engine that weighs 17 oz.
and honks pretty good. They are great in any .40-46
size plane, especially with an O.S., or a Magnum
carb. Been runnin' 'em for over 30 years, and got a
new one ( hoarded ) going in an Aresti.

This one is in a .40 size Ultra Stick ( love 'em ).
Magnum .46 carb....there is no better running "sport
engine" set-up than this .( trust me ).

Dave.

....flown almost every Sunday for 30 years....my
second R/C engine. Got it new from a guy, but
the carb was missing. Bought a new O.S. 7B carb
and stuck on it....3 crankcases, and 5 rebuilds
later....it still runs like a top. Put a Magnum carb
on it, cause the old 7B went on a O.S. .60FSR
restoration. I just used up my last NOS rod in
the K&B, and my last good used liner and piston.

This may be the last go-round for the ol' gal....
but this one, and an O.S. .60 FSR that I completely
wore out in the same plane....are the best two
engines that I have had the pleasure to "frazzle".

Dave.

Irvine 53
Regards,
Patrick