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os 46 ax ?rpm

Old 10-19-2007, 06:47 AM
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scserdarcan
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Default os 46 ax ?rpm

i have os 46 ax and it is new. it is make 10500 rpm with 11*6 prop. is it normal? i think this makes more.
Old 10-19-2007, 07:25 AM
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Default RE: os 46 ax ?rpm

That's way low unless you're breaking in the engine blubbery rich. You should probably see around 13,000-14,000 with a 10x6.
Old 10-19-2007, 07:31 AM
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Default RE: os 46 ax ?rpm

sorry i wrote wrong prop. size i use 11*6
Old 10-19-2007, 09:16 AM
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Default RE: os 46 ax ?rpm

Scserdarcan,


I would expect 12-12.5K on an 11x6 APC, depending on the fuel (% nitro) you are using.

Did you do the break-in as described [link=http://www.rcuniverse.com/forum/Tapered%2DBore_Engine_Break%2Din_%2D_Upgraded/m_1850473/tm.htm]here[/link], or did someone 'coerce' you to do it much richer?
Old 10-19-2007, 09:19 AM
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scserdarcan
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Default RE: os 46 ax ?rpm

11*6 apc propeller - %5 nitro tornado fuel and not rich, most performed tune. but it is 10.500 rpm
Old 10-19-2007, 09:29 AM
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DarZeelon
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Default RE: os 46 ax ?rpm

Scserdarcan,


I believe your engine is under-performing.

It is only putting out ~0.64 HP. It should put out a little over 1 HP.


I have not seen an OS.46AX in good condition that did not...
Old 10-19-2007, 09:59 AM
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wcmorrison
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Default RE: os 46 ax ?rpm

Is the engine new? The engines do need a break in (or as the British say a "run-in"). The engine will produce more power and RPM after the four or five tanks of fuel have been run through it. And as others have said, it probably needs to be "leaned" out a little bit more.

Do remember your engine will turn faster in the air than in a static position. The increas can be as much as a thousand RPM.

I would stay with the 11 X 6 prop. A 10 X 6 prop will make the engine run faster but you would not be obtaining the optimum performance for the power band of the engine. As Dar says your engine is under performing at the moment. More noise does not necessarily translate into more performance or power.

Cheers,

Chip
Old 10-19-2007, 12:23 PM
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BillS
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Default RE: os 46 ax ?rpm

Although the engine is a different brand here are the numbers on:

Mag Pro .45
15% fuel
11 x 6 MA old style 11,500 - 5 pounds 7 oz to 8 oz thrust
11 x 6 APC 11,600 - 5 pounds 10 oz thrust

10 x 7 MA Simitar 13,000 - 4 pounds 11 oz thrust
10 x 7 MA old style 11,800 - 4 pounds 5 oz thrust
10 x 7 APC 12,300/400 - 4 pounds 11 oz thrust

Bill
Old 10-19-2007, 01:11 PM
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Default RE: os 46 ax ?rpm

Serdar Bey,I recommend you to remove the baffle in the muffler to have more power.
Old 10-20-2007, 09:08 AM
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Default RE: os 46 ax ?rpm

I've got a new one also. I got a .51 supertiger at the same time. The I have messed with the low and high needle valve and it is runing at it's best now. Don't know the rpm but it will barly pull my extra .46 size plane. The engine is the smoothest running engine I have owned. I'm running a 11x6 prop also, i've tried a 10x8 but that sucked.
Old 11-12-2007, 09:55 AM
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kiwi4
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Default RE: os 46 ax ?rpm

sounds like the prop is too large that engine is rated at 1.65 hp try a smaller prop.Dan
Old 11-12-2007, 12:34 PM
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Default RE: os 46 ax ?rpm


ORIGINAL: scserdarcan

i have os 46 ax and it is new. it is make 10500 rpm with 11*6 prop. is it normal? i think this makes more.

Whats your altitude over their?

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