This engine will be for a Accel Hobby Katana

I've got the AX on my Kat and couldn't be happier.

I just but a Tower Hobbies $74.95 .46 engine in my sons trainer and I am amazed at how good this engine runs. It is a screamer, especially with it's semi tuned pipe it comes with. I was running the engine with a 10x6 prop for break in, and 11x6 for flight. It was way to much for this trainer, and I had it pukin rich. I think fter more break in and some proper tuning it wil easily pull a 12x6 or more.

We are going to run the trainer again with a 12.25x3.75 apc prop to try and slow it down a bit. Funny thing is that I'm positive it will have unlimited vertical with this prop combo.

So compare the weight of your Katana, and if it compares to the tower trainer in weight, I would say this engine would do nicely!

BK

PS. This engine idles better than any 2 stroke I have ever owned (And I have had a lot of .46's)

thanks for your replies , I think I will buy an OS as always.

I have never seen a bad Tower Engine, but if you want to keep the weight down, try the O.S. .46LA. It weighs less than 10 .oz[X(].


Woops

GMS 47....sweet engine, tons of power and if you want even more get a tower muffler for it...

Check out the cirkus...I have a vid of that exact setup under the user galleries. Thats with the stock muffler so the tower would have a bit better performance.

I also had some experience with my friends Tower 46. It seems like quiet powerfull and userfriendly.

But what I wonder is , is it worth spending 150usd to OS 50 SX. Is there so signicant power gain over the 46 ax. What makes this huge price gap between these two engines. ( ıt is like 108fsr and 160 fx ) Is there a gain in long term usage or what? I always wondered.

I thought for a while about going with the 50 SX over the 46 AX on my Kat. I'm glad I didn't spend the extra $$, because the AX is plenty for this plane. It's not a rocket pulling out of a hover, but vertical is out of site and plenty of power to pull out of a hover when trying to correct.

Also depends on what your altitude is. Here at 5000 ft. ASL we need the extra power of the 50.

That's a good point. I'm around 300ft ASL.

I just picked up the 46AX from a buddy brand new never been fired without the muffler for 65 buks, got a evolution 46 muffler off a friend that fit perfectly really worked out

That's similar to what I've got on my Kaos. I have a .46FX with the Evo TPS muffler. Be sure that the muffler doesn't come apart on you.


Woops

It is interesting to see that TT Pro 46 is ahead of the Os 46Ax

Using TT Pro -46 in my 3D spirit;with 20/22 fuel,pullouts from hover are incredible with APC 12.25x3.75
I also have used 46 FX before but can't seen much difference between two.
But there is a point,TT is ABN(nickel plated sleeve) and FX is ABC(Crome plated sleeve),so you should give a little more maintenance,like using a little more amount of lubricant (like Thunder Tiger told)in your fuel(minimum %17) to keep the engine healthy.
There is also one more point there,the TT was the lightest one between my choices.
MDS 48: 500 grs
MDS 58: 525 grs
Magnum 46: 490 grs
Magnum 52: 502 grs
TT Pro 46(Preferred): 461 grs

Rifat

The TT pro is and excellent motor, it rivals the AX in power and reliability, but i know the OS will have a longer life span

hey i just got that airplane and i will be powering mine with a magnum 46 xls with a tower pipe. those pipes are balistic!

"i know the OS will have a longer life span"

I have a TT 46 Pro that I flew over six years on a Morris the Knife. Over it's intire life it has been run on 30% heli fuel. While on the Morris it was run on a 10X5 APC and tached 15200 on the ground. The only thing that was done to it during that period was to replace the O-rings on the idle needle, when it quit in flight on two consecutive flights I knew something was wrong as it one of the best idling engines I've ever owed. Two years ago I removed it from the Morris and put it in a Lanier Mariner 40 seaplane. With a 10x7 on it the 46 Pro pulls the Mariner, which is a fairly large airplane, with authority, at least as well as a friends 40 size seaplane with an OS 46 on it. I've never has an OS last any better that that. Today I'm going to a nearby clubs float fly with my eight year old Pro 46 on my Mariner, I expect it will run just as well as it has the last eight years.

Wow thats awsome, iv never heard of any brand motor lasting that long.
Only reason i said the OS will out run is i had a buddy eat his TT pro alive in one summer while his AX was flown just as much and is still ticking hard.
Just my observation.

We have several Pro 46s in our club now, most were bought because mine ran so good. All the others also run very good and the youngest has at least two seasons on it. I can remember when OS was just a so so engine. They figured out what it took to make a very reliable engine and now they have a well deserved reputation. Others, such as TT, are now getting things figured out as well. BTW, the Pro 46 ran great again this last Sunday at the Float Fly, I put four flights on it and it never missed a beat. It has the same power it has had since day one, jerking the Mariner out of the water and doing aerobatics the whole flight. Amazing watching a seaplane flying continues circuits in KE with ease while I fight to make even one circuit with my Harrier 46. My friend with an 0S 46 powered Seamaster was also there, it quite on landing approach every flight except the last one. Being as he is a good friend, I had to rib him as he was getting in a wobbly john boat to rescue his plane.

Most likely the reason your friends OS quit is that it isn't set up right. I would be willing to bet that an OS will last a lot longer than a TT. The TT's are obviously cheaper made and if they could sell them for more, they would.

Thunder Tiger 46 Pro is a great engine, with a bit more power than the 46FX. The AX is supposed to have more power but is $30 more.....I have 3 TT and 2 FX I use the TT more often....

CeeGee, of course it wasn't set up right. After three flights, adjusting the idle a little after each flight, he had it idling just fine. The point was that it was idling great the last time he flew it, but it apparently it changed while it set on the shelf. My TT 46 Pro also set since the last time we went to his clubs float fly, but I didn't have to touch anything except to tweek the high needle two clicks as it was running a little rich on the first flight. I haven't touched the idle needle on the Pro 46 since it went into the Mariner two years ago. As for the TT being obviously cheaper, I have had a lot of OSs over the years, starting in the late 60s, and my Pro 46 has as good a finish as any OS I have owned, and with eight years of running on it now, has out lasted most of the ones I have owned. Given how it has preformed, I would have gladly payed as much for it as I would have for an OS. The way I look at it, the TT is priced the way engines in this preformance catagory should be priced, which makes the OS 46 overpriced.