757jonp

My Feedback: (48)

Been using a 55AX on a 8lb Northstar,and it flies that tank with authority! A little pricey, but it's a powerhouse. Easy to tune, holds it's tune. I highly recommend it for any 40 size plane.

jimmyjames213

My Feedback: (2)

the ax55 is not a racing engine, it is more of a torque engine. the mangum 52 is more of a racing engine and loves to rev, the ax55 seems to be happiest around 13000 rpm although it will still turn props in the 12000 range decently when its broken in
imo the ax55 is one of the best os 2 stroke engines, the ax46 is decent but most of the cheaper engines transition better, are just as if not more reliable and give more power than the ax46 aka gms, magnum tt, st, ect.
the ax55 seems to be in a class of its own, the magnum .52 will keep up with it if its in a sports model turning high rpm's but it doesnt fair as well in the lower rpm range and wont turn as big of a prop without complaining. the magnum doesnt idle as well as the ax but it does transition a little better

it really depends on what plane you are trying to fly and what you want to pay, also how much time you have. the magnum will keep up with the ax turning 11x6 ish size props in a sports model, that being said you will be fighting the magnum for the first gallon, but once you have it set you never have to touch it. the ax55, if you break it in on a sports model with a 10x7 prop for the first gallon then switch to the 11x6 or 11x7 size props, the engine will give you little complaining, unless you want to fly right in that midrange lag, which in sports models is irrelevelent, but in 3d models its a real PITA.
that being said you can buy two magnum 52's for the price of one ax55 so it just depends if you have the time to breakin the magnum, or is half a day of tuning and flying the magnum worth 70 bucks to you. its your choice
i have both engines, i cant say which i prefer, the magnum is a great engine as is the ax. if i had 150 bucks and had to pick right now i dont know what i would go with, im usually a "go with the other brand besides os" guy as many will state, but both engine are so close.

btw the gms is out of stock at advantagehobby as well
that is my favorite .46 size engine of the 5 or so different brands i either own or work with including os (ax46 and .46la) magnum, tower, ect
i wont go off on how great my gms is thats for another day

DamonR

My first glow trainer had an OS LA40. It was probably a good first engine, but as I learned to fly, I purchased the OS AX55. Needless to say, the change was dramatic. Now an over controlled elevator that would pitch the model into a stall is a sustained vertical climb. Maybe it's a waste on a trainer, but it is a great model to fly in the winter on skis.

JethroTull

My Feedback: (1)

The 55ax is an awesome motor and coupled with a TH .46 muffler it will turn an APC 13x4 at 13,000rpm on 15% with instant throttle response.

DamonR

This video has lots different airplanes including the OS AX55 powered trainer.

[youtube]http://www.youtube.com/watch?v=MhRztV6W_xs[/youtube]

tony0707

HI THE NEW evolution 60 nx is a bored out 40 cases/b a powerhouse in a 40 size plane -it was designed to be just thatit is a very light design- a new release so not much current info is available yet-but the evolution line of engines is very impresive as a rule -and all ABC 's are true crome liners -not nickle plating

ChuckW

With the exception of a couple, every Evolution I have seen has been very problematic. I'd be much more likely to buy some of the inexpensive engines like JBA, Magnum/ASP, GMS, Tower, etc. before an Evolution. Just my opinion of course. If they are working for someone then I can't argue with that.

Tony Iannucelli

My Feedback: (193)

I am on my second AX55. Call me crazy, but I used a 14 x 4 Zinger on a UCan 46 and it would pull out of a hover consistently on YS20-20 and had terrific overall performance. It never died in the air. Never. I used it for about 150 flights. The transmitter read 30+ hours, some of which was for programming the transmitter. It gradually lost power because of a worn piston, sleeve, and bearings, and Hobby Services rebuilt it for me for $85. Meanwhile, while I was waiting for the return repair, I bought another one new and put it on the same plane. This time I went with a 13 X 4, and it flies great with still good verticals. I actually think the 14 x 4 was asking a lot, but the engine would spin-start with three fingers almost every time when it was warm. Great idle, smooth power. I might just go back to the 14 X 4. There's an APC hanging around here somewhere. Rock on OS.

jimmyjames213

My Feedback: (2)

thats surprizing it should last much much longer than 30 hours.

the 14x4 is way to much prop, the 13x4 is about the limit and even that is pushing it

freakingfast

My Feedback: (3)

You will love the 55AX

I've used APC 12.25x3.75, 13x4 and 12X5 for 3D, and much preferred the APC 12X5 with stock baffle/muffler and 15% nitro fuel.

The 12.25x3.75 seemed too light and this engine only revs out so far and the 13X4 I think was a bit too much.

freakingfast

My Feedback: (3)

Not catching the rear bearing going south in time may have been the root cause of the power loss. Small bearing particles and nickle plated sleeves don't play well.

I've lost track of the gallons and run time on one of mine, but I know it's on it's third rear bearing(same front). When you feel a rear bearing getting gritty and/or noisy when you turn the prop back and forth don't wait too long to replace it. It's no big deal to do and most of the time I don't need to replace the front bearing.

Mugen Mbx5

What is a TH muffler and where do I get one? I hear the tower muffler is good also but its sold out until Jun or July I think. I haven't been into planes for a couple years so I'm trying to learn the good set ups again.

delman

TH is short for Tower Hobbies I believe.

RCKen

My Feedback: (9)

http://www3.towerhobbies.com/cgi-bin...?&I=LXJB16&P=7

ken

Mugen Mbx5

DUHHHHHHHHHHHHHH!!! I should have known. I'm on the email list when it gets back in stock, but thats a long way out.

thedeeman

I have a few 55s and they are great. With all of them I am using the tower muffler and they scream!! And they have all been 100% reliable. You can't go wrong with one (or more).

spaul813

My Feedback: (44)

I had one in a P-51 Mustang PTS. Plenty of power and would do about anything I wanted it to. I agree with one of the earlier posts about the mid to upper range. Top end doesn't appear to be what your looking for so you should be fine. Hands down, without question the best prop for this motor was the 12-6. Best combination of power and speed regardless of how I was flying it. Good luck!!

gunneredwards

My Feedback: (4)

I have a 55ax on my dazzler and it is great... unlimited verticle performance and I usually use about 75% throttle for everything. Easy to break in and tune. I recommend them to anyone that has a 60 size plane or smaller.
dan

gunneredwards

My Feedback: (4)

BTW, I am using an APC 12x8 prop.

rglgatortail

My Feedback: (7)

Everyone here is talking just about 3D stuff and a few on sport level but what about something along like running this engine on a pitts muffler and a GP P-51 Mustang behind it? I do have a magnum on a GP 40 Ultrasport and the plane is the fastest plane at my flying field so far but I wanna know what the 55ax will turn breathing thru a pits muffler either a bison or slimline so if there is anyone that has the 55ax on a pits muffler let me know what your numbers are doing. I have a picture of my mustang in my gallery if anyone wants to see.

ChuckW

Did one on a GP Revolver with a Slimline Pitts muffler. Outstanding with either an APC 12x7 or 11x8. Ran like a top and the plane was very fast. sounded cool too; really throaty at idle almost like a tiny gas engine or something.

gunneredwards

My Feedback: (4)

I have the bison pitts muffler on my os 46ax and did not notice more than a 3-400rpm drop. The power is great and I would not expect the 55 to loose too much either. the sound is so much better than that of the stock muffler and the looks are also an improvement. My 55 is turning 13600 rpm with the stock muffler and I am swinging a 12x8 on it-does not bog down and on a 6 oz tank in my dazzler I get about 14 minutes of actual flight time. I usually run 1/2 to 3/4 throttle. love the ax.
dan

freakingfast

My Feedback: (3)

There is something wrong here, that's a lot of prop at that rpm. Either the your tach is malfunctioning, you are mistaken about your prop size, its miss marked or it's inefficient.

OS lists recommended props as: 12x7, 12x8, 13x6, 13x7 however these are not for ultimate performance, but for noise reduction.

Try some APC 12.25x3.75, 13x4 and 12X5* for 3D or APC 11X6, 11x7 and Master Airscrew S-2 series 11X7* for sport. The difference is shocking.

(* preferred prop)

If your happy with it as it is now, don't change a thing.

gunneredwards

My Feedback: (4)

I'll check it again this weekend. The prop is a 12x8. I have'nt had it out in the snow yet, and I was also surprised it would pull those numbers. & yes, the first tach i had from tower was defective, but these numbers are off the new one with fresh batteries. I''ll double check though, those numbers could have been off my break in prop and I wrote it down wrong.
dan

MinnFlyer

My Feedback: (4)

I run a Graupner 12x7 on mine and it swings that big fat prop with authority!