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os max 46 ax prop size

Old 03-06-2010, 09:20 PM
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bbrown2828
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Default os max 46 ax prop size



ok i have about 10 to 12 flights on this motor.... have been running a 10 x 6 on it what size prop would yall use

Old 03-06-2010, 09:31 PM
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gunneredwards
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Default RE: os max 46 ax prop size

I am swinging a 12x8 on a cub and have tons of power. RPM is just at 10k.
dan
Old 03-06-2010, 10:19 PM
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bigtim
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Default RE: os max 46 ax prop size

11/6 works well 10/6 is a bit small for the AX
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Old 03-06-2010, 10:26 PM
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ChuckW
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Default RE: os max 46 ax prop size

I'ved used 11x5, 11x6, 11x7 and 12.25x3.75. They all seemed to work well. I'd buy a few props in various sizes and brands in the general range for the engine and try them. Decide which one you like best and go with it.
Old 03-06-2010, 10:52 PM
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Default RE: os max 46 ax prop size


ORIGINAL: ChuckW

I'ved used 11x5, 11x6, 11x7 and 12.25x3.75. They all seemed to work well. I'd buy a few props in various sizes and brands in the general range for the engine and try them. Decide which one you like best and go with it.
couldn't agree more with Chuck, wouldn't want to narrow your choices by my selections,

it really depends on application,the 11/5-7 props are more for sport applications, the larger lower pitch props give you pulling power like for 3D type flying.

the plane I have is a sport stunt plane and a 11/5-7 is best suited for me and the type of flying I do,depends on what plane your flying.
Old 03-06-2010, 11:13 PM
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jimmyjames213
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Default RE: os max 46 ax prop size

ORIGINAL: gunneredwards

I am swinging a 12x8 on a cub and have tons of power. RPM is just at 10k.
dan
12x8 is a 70 sized prop their is no way your ax is turning that with any authority, try a 12x4 and you will see a huge power increase (if you dont like it you can go back the the 12x8 but for 3 bucks try the 12x4 and expierence a new airplane), your engine will run a whole lot better as well.
i just swapped a 11x6 prop on a friends ax46 down to a 11x5 and the difference was amazing, the engine (on a gp escapade) went from having power to being a rocket. it was turning the 11x6 around 11500 and the 11x5 around 12500 on wildcat 10% nitro. it sounded and ran a lot better with the 11x5, it was one of those funky nextar props.
those numbers seem a little low to me but the engine is still somewhat new (gallon though it). on the same day (today) my magnum 46 was turning a mas 10x7 14000 on 0% nitro, im guessing it would turn the 11x5 around 13000. its still new with about half a gallon through it


what ive been noticing here and at my field is people sont understand that a engine has a powerband.
what that means is the engine makes the most amount of power in a certain rpm range.
to put this into everyday language, imagine you are in a compition where you have to move 500 pounds 30 yards in the least amount of time. the weight is divided into 5 lb bricks.
you could carry 2 bricks in each hand and run the entire time but you arnt carrying enough weight to do very much, equate this to useing a 9x6 prop on a ax46, its turning 15000+ rpm but its not enough to do anything. you could carry 75 lbs and walk the 30 yards, the most effficent way, like useing a 11x5 10x7 or 12x4 or 12.25x3.75 on a ax46, or you could try and carry 150 pounds and hardly move at all, still moving but way to slow to do anything. this is like throwing a 11x7+, 12x6+, 13x4+ on the ax46, it will still turn the prop but not very efficently.

ideally the rpm range on ball bearing 2 strokes (it depends on engine, porting, timeing, ect but for the most part) is 12500 to 14000 rpm (at WOT), if you are above or below that range your engine isnt making as much power as it could.
for bushing 2 strokes it seems to be from 10000 to 12500, ive only used os la, fp bushing engines so i cant say for the other brands
for 4 strokes its 9000 to 10500, the best being around 9600-10000

this depends on the engine size the bigger the engine the lower rpm's it will turn, but for the smaller glows (below 100) those tend to be the case
Old 03-07-2010, 12:45 AM
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Default RE: os max 46 ax prop size


ORIGINAL: bbrown2828



ok i have about 10 to 12 flights on this motor.... have been running a 10 x 6 on it what size prop would yall use



A little more info would help...like what type of airplane is the engine installed in?
A 10x6 is a little bit small, but not too much so. A 10x7 for speed...or a 12x4 or 12.25x3.75 for pulling power. An 11x6 for intermediate use.
Old 03-07-2010, 06:32 PM
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Default RE: os max 46 ax prop size


[/quote]



A little more info would help...like what type of airplane is the engine installed in?
A 10x6 is a little bit small, but not too much so. A 10x7 for speed...or a 12x4 or 12.25x3.75 for pulling power. An 11x6 for intermediate use.
[/quote]

agreed 100%

the guy running a 12x8 way too big.
Old 03-07-2010, 10:56 PM
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bbrown2828
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Default RE: os max 46 ax prop size

its on a league rc velox 58
Old 03-07-2010, 11:19 PM
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Default RE: os max 46 ax prop size

try a 12x4 apc youll be impressed

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