Prop for OS 46 AX

Prop for OS 46 AX
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Prop for OS 46 AX - 6/29/2007 5:14:49 AM

mesaflyer

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From: Calimesa, CA, USA
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I posted this message at the end of another thread, but did not get any response, so I thought I would try it again. I have a prop question. I have an OS 46 AX engine on my H-9 Pulse XT. The engine manual recommends a 11 x 6 for break-in. After that, the manual says I can run a 10.5 x 6, 11 x 6-8, or 12 x 6-7. I don't need to have the fastest plane, but curious if anybody out there has any experinece trying different props and what seemed to work the best for this plane or engine.
Thanks

Post #: 1

RE: Prop for OS 46 AX - 6/29/2007 5:24:59 AM

Major Pain

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From: Camden, TN, USA
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mesaflyer: My buddy has a Pulse XT with OS 46 and has good luck with 10x6. I've flew it and it has plenty of power and get up and go. Kinda depends on the kind of flying you do but good alround prop.---------Revver Bro#164

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RE: Prop for OS 46 AX - 6/29/2007 5:38:33 AM

ServoShack

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From: Oviedo, FL, USA
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I was asking about the engine and someone said a MAS Master Air Screw 11x7. Well they said it's good for beginners (me)

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Post #: 3

RE: Prop for OS 46 AX - 6/29/2007 11:18:33 AM

j.duncker

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11x7 will be running below the peak power point. It will be quieter though.

11x5 or 10.5 x 6 seems to be the sweet spot for this engine.

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RE: Prop for OS 46 AX - 6/29/2007 1:35:01 PM

hungryandbroke

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From: blacksburg, SC, USA
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I have the OS 46 AX on my sig something extra and I run a 11-6 prop on it.

I beleive the smaller size props will make it faster once it's in the air and the larger size props will give you less speed but better pulling power.

On take offs smaller props = longer runway to get it airborne.

Larger props = shorter runway to lift off.

I beleive the more rpm's you get out of an engine = more wear on your engine.

Experiment with different props and then you will know.

If I had the pulse I'd run a 11-6 on it with the os 46 ax.

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RE: Prop for OS 46 AX - 6/29/2007 1:56:15 PM

da Rock

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11x5 has been ok on all those engines at our field. A number of fliers have had better luck with 11x6s.

10x6 used to be the accepted standard for 35s. All the guys who've run them at our field on the 46AX have changed to larger props . Well, one guy still is running a 10x6 but he loves speed and screaming engines. I've tried to talk him into trying a 10x7 or 10x8 but he hasn't so far.

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Post #: 6

RE: Prop for OS 46 AX - 6/29/2007 2:35:56 PM

CGRetired

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From: Galloway, NJ, USA
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You can find a range of props for that engine. It all depends on what performance you want. Smaller pitch props (the second number in the prop size) will usually cause more RPM. So, you will have to watch that so you do not exceed the max RPM for your engine. It is not unusual to get 12,000 RPM out of that engine when it is running correctly and correctly prop'ed.

Think of the pitch as changing gears in your car transmission. Lower gears relate to lower pitch numbers. You get more power, faster acceleration, higher RPM, but less speed. Higher pitched props will give you less power, slower acceleration, lower RPM, but higher speed. But, at limits. You cannot, for instance put a 15-10 prop on a 46 sized engine. It will run, but you will never get the thing off the ground.

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RE: Prop for OS 46 AX - 6/29/2007 8:53:23 PM

fadi81

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I used to run my OS 46AX at 13600rpm with the 10x6... I killed the engine after a while

Note that in the catalog they specify a theoretical range up to 17000rpm with a power peak at 16000rpm (never happens in real life)

I bought another one, installed the 11x5 and 11x6 and event went up to the 11x7 then 11x8; and finally tried the 12x4 on 3D planes

They all run differently, but I feel you get the best out of this engine with the 11x5, 11x6 and 12x4. It depends on what you need.

After all, the manufacturer, for breakin, I think, should be recommending the ideal prop in its manuals

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RE: Prop for OS 46 AX - 6/29/2007 10:06:52 PM

jaka

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Hi!
What's an ideal prop??

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RE: Prop for OS 46 AX - 6/29/2007 11:00:11 PM

hungryandbroke

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From: blacksburg, SC, USA
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The one that won't bite your fingers!

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RE: Prop for OS 46 AX - 6/29/2007 11:07:47 PM

KIreson

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Using a 10 X 7 prop with the AX46 is the answer for performance. It puts the engine in the power range for max power without over reving.

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Post #: 11

RE: Prop for OS 46 AX - 6/30/2007 2:06:34 AM

fadi81

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Yeah I know you are right, the ideal prop depends on what you want to achieve

but in the contest of our conversation, I meant the prop that puts the engine in its comfort zone and achieve good power output in relation to its fuel input and/or weight...

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RE: Prop for OS 46 AX - 6/30/2007 2:59:38 AM

Enterprise7

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From: Baton Rouge, LA, USA
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what the rc world needs is a nitro size variable pitch prop. I have the rimfire v-pitch on my flatout but haven't flown it yet.

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Post #: 13

RE: Prop for OS 46 AX - 6/30/2007 5:33:37 AM

JPGale

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From: Sunnyvale, CA, USA
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quote:

ORIGINAL: fadi81

I used to run my OS 46AX at 13600rpm with the 10x6... I killed the engine after a while
Note that in the catalog they specify a theoretical range up to 17000rpm with a power peak at 16000rpm (never happens in real life)

I bought another one, installed the 11x5 and 11x6 and event went up to the 11x7 then 11x8; and finally tried the 12x4 on 3D planes
They all run differently, but I feel you get the best out of this engine with the 11x5, 11x6 and 12x4. It depends on what you need.

After all, the manufacturer, for breakin, I think, should be recommending the ideal prop in its manuals

I use the 46AX on my race T34's and I run 9.5x6 APC at upto 17200, 9.5x7 Bolly at 15000 and 10x5 APC at 16500, the fast one is the bolly, the engines in these planes have been know to last for 2 or 3 years, or 1 year and then make a great sport engine. We run them at the limit, but I know one of the guys put a 46AX on a skyraider mk2, to make sure he did not rip that plane open he used a 12x4N, he says it is real slow but great pulling power, for a beginner that would be the best way to go big low pitch prop. Also get some good after run oil, I use http://myrcsupply.net/index.php?main_page=product_info&cPath=100_113&products_id=42204&zenid=8eef40ab407bc8ae93ed377e446ebc17 and it is great it will look after the engine well if you take the higher RPM option.

Also in another post this engine on a small prop my plane will take off across the runway at my field with is about 65ft.

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Post #: 14

RE: Prop for OS 46 AX - 7/1/2007 6:14:30 PM

DocWill