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Old Jun 11, 2008, 11:01 AM
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martseger63's Avatar
Estonia
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OS MAX 46AX vs. 55AX ?

Is the AX55 worth the 40 extra bucks? (105$ vs 145$)
Will it power The World Models Groovy 50/Spot On 50 (Plane thread) nicely?
http://www.theworldmodels.com/para/p...?airplaneid=88
http://www.theworldmodels.com/para/p...airplaneid=175
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Old Jun 11, 2008, 02:53 PM
Sippin' on Kool Aid
Long Island NY, USA
Joined Dec 2005
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If the plane warrants the extra power, than by all means yes!! i think you'll be happier with the 55 on a 53 inch wingspan plane.

the 46 has awesome power in and of itself but the 55 just blows it out of the water. great great power on 13 and 14 inch props
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Old Jun 11, 2008, 03:19 PM
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Good to hear actually! You have both them? What prop you'd recommend for pattern flying?
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Old Jun 11, 2008, 04:50 PM
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Tokoroa
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As they say.. there's no replacement for displacement ;-)
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Old Jun 11, 2008, 05:00 PM
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Except going for electric that is.
I actually like both. I have owned two .15 SC (Magnum XL clone) engines.
Are the OS MAX-s easy to tune?
The reason i asked the 46 vs 55 is because the money difference is quite noticeable but the hp rating isn't. 1.65 vs 1.75. But probably the 55 has still more torque and overall power?
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Old Jun 11, 2008, 05:12 PM
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Edmonton, Canada
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55AX vs 61FX?

Anybody see advantages for the 55AX over the 61FX? Very similar hp and rpm rating but the 61FX weighs 5 oz more. The specs show similar prop range as well:

55AX
1.75 hp @ 17k RPM
14.3 oz weight
props 12 x 7-8, 13 x 6-7
fuel 5-20% nitro... 15% seems to be the default inferred from the documentation

61FX
1.90 hp @ 17k RPM
19.4 oz weight
props 12 x 6-8, 13 x 6-7
fuel 5-20% nitro
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Old Jun 11, 2008, 05:52 PM
Sippin' on Kool Aid
Long Island NY, USA
Joined Dec 2005
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Quote:
Originally Posted by martseger63
Good to hear actually! You have both them? What prop you'd recommend for pattern flying?

i own the 46 AX but a buddy of mine gave me a tango 40 with a 55AX for 2 months and the motor was brand new when i got it.

for the 46AX, for pattern flying i'd try some 11 inch props maybe starting at like 7 or 8 degrees pitch. i personally fly 3d and LOVE the APC 12.25x3.75 prop. awesome awesome thrust and just overall great power

for the 55AX i honestly cant say. i believe they suggest 13 and 14 inch props for it but if your looking for speed try 13 with a higher pitch. dont trust me on that as i'm not totally sure. Your LHS, or guys on here may know more than me
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Old Jun 11, 2008, 05:55 PM
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Ok, thanks. Probably going for the AX 55 then.
Anyone actually know something bad about that engine?
Still holding my eyes open for suggestions/other options.
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Old Jun 11, 2008, 07:16 PM
Sippin' on Kool Aid
Long Island NY, USA
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i honestly dont think there is anything wrong with that engine :-). great great engine, easy to tune, runs like its brand new every time
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Old Jun 11, 2008, 07:21 PM
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The Netherlands-Amsterdam
Joined Mar 2007
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Hi,

I own a 55AX and don't regret a moment for buying it!

I fell in love with the AX55 when I saw it the first time and stille enjoy this engine just like the first days.

I''ve been flying it now for over 7 months and 8 gallons of 10% Coolpower.

If you ask me: Go for the 55AX!
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Old Jun 11, 2008, 08:28 PM
The reviewer
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Tokoroa
Joined Mar 2004
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Quote:
Originally Posted by andrew_c80
Anybody see advantages for the 55AX over the 61FX? Very similar hp and rpm rating but the 61FX weighs 5 oz more. The specs show similar prop range as well:
That 5 oz is a *lot* of weight on the nose of a model.

Unless you're building a model that's designed for that extra 5 oz, it'll end up way too nose heavy with a 61 in it.

And you're right, the .61 isn't a powerhouse.

Remember, you can always add a little lead if you need to but there's no way you can actually lighten the 61.

Forget the .61, these have been pretty much superceded by the .90-.91 sized engines anyway, which offer lots more power at no extra weight.

Stick with the 55AX for a 40-50-sized plane. They're a good motor that makes excellent power and has a great throttle response.
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Old Jun 16, 2008, 07:00 PM
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Loveland, CO
Joined Jun 2008
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I fly a Kadet LT40 with 41" floats. The 46AX with 11x7 prop. has more than enough power to climb straight out of the water. Easy to start and no special tuning required. I fly at 5-7000 ft. above sea level.
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Old Jun 16, 2008, 09:19 PM
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Lafayette, IN
Joined Jun 2007
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My neighbor and I both have a H9 Pulse 40. His is powered by a .46FX and mine has a .55AX. These both perform nicely and both fly about the same speed. However, the .55AX will pull mine straight up until I can't see it. The .46 only goes straight up for a few seconds before it starts to run out of power. I might be able to re prop mine to get some more speed, but I have too much fun with it the way it is. I would definitely go with the .55! I doubt that i will ever get another .46!
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Old Jun 16, 2008, 10:33 PM
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USA, IL, Benton
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I've been flying both and I really like the 55 better. I had the 46ax on a Venus with 10x7, 11x5, 11x6 and it was just fine. I then changed out the 46 for the 55 and it did make quite a difference. Try the longer props if you want but in my personal experience I'll not use larger than a 12x5 or 12x6 on the 55. It does real well with either 12" on the Venus and another sport plane I fly it on. The 55 does well with a 11x6 also.
Fred
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Old Jun 18, 2008, 01:18 PM
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Thanks for all replies!
Gonna order the 55ax in coupla hours.
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