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OS 46 AX readings?

Old 06-26-2006, 11:33 AM
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Kostas1
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Default OS 46 AX readings?

Hi.
I am going to buy an OS 46 AX and i want to know about it's performance!
Thank you all.
Kostas
Old 06-29-2006, 06:53 AM
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oceansfiftyseven
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Default RE: OS 46 AX readings?

I get 12,300 on mine with an MAS 11x6 and a Bisson pitts muffler. Rich
Old 06-30-2006, 06:25 AM
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The Raven
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Default RE: OS 46 AX readings?

10% nitro, standard muffler

11x5 MAS does 14000rpm (too small, sounds great with the prop screaming though)
11x6 MAS does 12000rpm
11x7 MAS does high 11000's (can't recall exactly but it likes this prop)
Old 07-01-2006, 03:57 PM
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redgiki
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Default RE: OS 46 AX readings?

Be aware that all my readings are at 4,900 feet elevation. Your mileage will vary. Stock muffler. I back the needle off around 300 RPM from peak on the ground, but as the props vary in their "sweet spots", there's a variance of 100-300 RPM from that planned off-peak reading.

9x7 APC: 15,000 (15,500 with a Tower muffler with no baffle, but man, is it ever noisy!)
10x7 Top Flite PowerPoint: 13,000
10x8 APC: 12,100
11x6 Top Flite PowerPoint: 11,800

I fly a 7lb Great Planes Patriot 40 with this motor. The 11x6 works really well at keeping the vertical going fairly strong (not unlimited due to altitude), but the 10x7 hauls the plane around with authority, yet gives a nice pitch speed too for speed planes. The APCs are way quieter than the Top Flites, too.
Old 07-02-2006, 03:11 AM
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Kostas1
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Default RE: OS 46 AX readings?

Nice to hear these numbers!
Old 07-08-2006, 05:53 PM
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les40
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Default RE: OS 46 AX readings?

APC 11X6, 15% nitro, 3000 ft., 100 deg. F produced a peak rpm of 12,300.
Old 08-01-2006, 07:54 AM
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skrez
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Default RE: OS 46 AX readings?

hi guys,
Stock AX muffler with baffle removed, 10% 11-6 MAS 13,200. WOW
Frank
Old 08-01-2006, 11:23 AM
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warbirdjunkie
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Default RE: OS 46 AX readings?

Using APC 9.5 X 6 15% nitro toping out at 17300 richen to 16550 to pilon race. Some people are doing better then this, I know because they can pass me on the straight away, not sure which prop they are using
Old 08-01-2006, 04:40 PM
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Build-n-flyer-RCU
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Default RE: OS 46 AX readings?

How 'bout a pair on my Twin-Air at 14,000 RPM with 11x5 APC's and Ultrathrust mufflers, 15% Omega. Sounds awesome. I'm going to try 10.5x6's next.
Old 09-07-2006, 02:17 PM
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daven
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Default RE: OS 46 AX readings?

APC 10x7

Peaks out 14,300 - 14,500

Runs great at about 500 rpm off peak.
Old 06-27-2010, 03:56 PM
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_Tommy D
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Default RE: OS 46 AX readings?


ORIGINAL: daven

APC 10x7

Peaks out 14,300 - 14,500

Runs great at about 500 rpm off peak.
Interesting

Here at sea level on 10% <20% Castor> I'm getting 13,400 on a 10x7 APC.

Oh, it has a Macs "do nothing" black muffler vs the stock powerbox.

Sounds like I'm down on power.
Old 06-27-2010, 11:58 PM
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airraptor
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Default RE: OS 46 AX readings?

why does everyone still run master airscrew props lol. a 10x6 MAS is not the same pitch as a APC 10x6. compare your self put the two props hub to hub and look at the AOA of each prop.

IF you have a 10x6 MAS its closer to a 10x4.

on APC 9x8 i get 17,400 on jett muffler
Old 06-28-2010, 10:28 AM
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Default RE: OS 46 AX readings?

Going to try a Macs pipe and headder on mine. Had to order the XL one to fit the Kougar.

Will have more news later in the week.
Old 07-02-2010, 05:36 PM
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Default RE: OS 46 AX readings?

Added Macs EX-Long (2592) Header to replace the standard one on the #1943 Pre tuned system. <removed better then 1">

Same setup on fuel and prop that yielded 13,400 static <10% and 10x7 APC>

Now makes 14,500. Good throttle response, nice idle.
Old 07-31-2010, 03:29 PM
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Default RE: OS 46 AX readings?

I have three of them, all with APC 10x6 props. Two use a macs one piece muffler. Those two turn 14,500 on 10%, and run a really long time on 8 oz of fuel. One's in a Shrike, the other in a Mikulasko Arrow. Performance on both is astonishing. The third one is on a trainer and I haven't tached it. I have found through experience that the macs mufflers take about 500 rpm off the top end. The OS Ugly Box is pretty efficient, but I don't like it because of it weighs so much and makes balancing the airplanes more difficult.
Old 08-04-2010, 10:53 AM
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Default RE: OS 46 AX readings?

I'm getting right at 15,000 with an APC 10x7 or an APC 12x4 using a Macs header and pipe. There's more in it but it runs great and the transition is very smooth with no lean/rich hesitation.
Old 08-04-2010, 11:52 AM
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Default RE: OS 46 AX readings?

I'm using 10% fuel, and we're about 1200 feet above MSL. I also set for a 200-250 rpm "bump" on a pinch test. It sounds like they get up to at least 15 grand in the air, but no way to tell.
Old 11-23-2010, 09:25 AM
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TimBle
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Default RE: OS 46 AX readings?

anyone try a 12x6 on this engine? rpm with a #8 and 10% Omega?
Old 11-23-2010, 03:44 PM
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Default RE: OS 46 AX readings?


ORIGINAL: TimBle
anyone try a 12x6 on this engine?
WAY too big for this engine. An 11x6 is a bit big as well. I'm currently running an APC 11x5 with a header and pipe and it loves that prop.
Old 11-26-2010, 01:26 PM
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Default RE: OS 46 AX readings?

Hi!
Don't say that!
I was also thinking so, but a newbie came along a few years ago with his ASP .40 (Same as a Kyosho .40 GX) in a Kyosho "Calmato ,high winged trainer, and low and behold, he had a 12x6 APC on. I was very reluctant to help him fly his plane with that big prop, telling him that for .40 engines 11x6 props were a better choice.
But when I started the engine and saw with my own eyes that the engine could in fact turn that big prop with outhority I was convinced. He used 16% nitro and 15 % all synthetic oil.

That's why I today race succesfully with the same kind of engine in Q-500 pylon. My Kyosho GX.40prop turns a 10x6 RAM (which is the best prop together with the new Graupner 10x6 "Cam prop" with up swept tips)at 14600-14800 rpm using FAI fuel.
We use 10x6 props here in Sweden in Q-500 racing and FAI fuel.


Old 12-06-2010, 07:28 AM
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Default RE: OS 46 AX readings?


ORIGINAL: jaka

Hi!
Don't say that!
I was also thinking so, but a newbie came along a few years ago with his ASP .40 (Same as a Kyosho .40 GX) in a Kyosho ''Calmato ,high winged trainer, and low and behold, he had a 12x6 APC on. I was very reluctant to help him fly his plane with that big prop, telling him that for .40 engines 11x6 props were a better choice.
But when I started the engine and saw with my own eyes that the engine could in fact turn that big prop with outhority I was convinced. He used 16% nitro and 15 % all synthetic oil.

That's why I today race succesfully with the same kind of engine in Q-500 pylon. My Kyosho GX.40prop turns a 10x6 RAM (which is the best prop together with the new Graupner 10x6 ''Cam prop'' with up swept tips)at 14600-14800 rpm using FAI fuel.
We use 10x6 props here in Sweden in Q-500 racing and FAI fuel.
I'll stand by my original quote. A 10x6 is a good prop for a .40 or .46.
Old 12-07-2010, 11:54 AM
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Default RE: OS 46 AX readings?

HI
GO WITH AN OS 55AX- any plane you could put a 46AX in will take a 55AX so why not go for the added performance you will gain remember -performance is always a power to weight ratio i do think a 55 is a board out 46 so the engine weights are about the same and the power of the 55 is greater- in fact the power of all the AX series of engines is awesome- my 75 AX is turning a 14/6 apc @ 11,300 RPMS my 91 FX turns a 13/6 apc - a full one inch bigger prop- all AX series engines are putting out more power for there size than any other series of OS engines in the past and that is a real good thing
A 55 SIZE engine is as big as i would go in a 40 size airframe-or the wing loading starts to be an issue especially on landingwere you need to look you best always

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