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Prop size + engine..

Old 06-02-2007, 05:17 AM
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skaap2k
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Default Prop size + engine..

Hi,

I was recommended to use a 13x6 prop with my OS 55AX engine, however, the hole in the prop is larger than what's on the engine, what do you do in this case?

Thanks in advantage!

RN
Old 06-02-2007, 06:34 AM
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alan0899
 
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Default RE: Prop size + engine..

G'day Mate,
I would turn up a bush, on my lathe & insert it in the prop, to reduce the hole size, or you could just buy another prop.
Old 06-02-2007, 08:05 AM
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Default RE: Prop size + engine..

I would just wrap a layer of tape around the drive shaft

I can hear the nasty comments already, but I've done it many times with no problemo
Old 06-02-2007, 08:51 AM
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Default RE: Prop size + engine..

I've done that. Why a 13/6? Thats kind of on the higher side here. What ya flying?
Old 06-02-2007, 10:33 AM
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Default RE: Prop size + engine..


ORIGINAL: MinnFlyer

I would just wrap a layer of tape around the drive shaft

I can hear the nasty comments already, but I've done it many times with no problemo
Minn's got it right.
Old 06-02-2007, 12:05 PM
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Big feet
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Default RE: Prop size + engine..


ORIGINAL: Trollmaster

Why a 13/6? Thats kind of on the higher side here.
I agreed with this at first, but then I thought, a 60 normally runs an 11x7, I surpose its not too far out for a 55, you could step the diameter down to 12 if the engine wont peek out.

Tape is a good idea, I have never had this problem. It's nice to get a solution before the problem for once.
Old 06-02-2007, 12:13 PM
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scratchonly
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Default RE: Prop size + engine..

You can likely find a size of brass tupe which will make a good shim.
Old 06-02-2007, 12:48 PM
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skaap2k
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Default RE: Prop size + engine..

I put the question here simply because I thought it was a fairly simple question, and I had never come across this problem before with my other models.

Making some sort of collar is out the question mostly - finding someone who has a lathe capable of making small bits like that is near to impossible in this country!!
I'm building (assembling) a TF Cessna 310 and looking around here and talking to others, a 12x7 or 13x6 2 blade props are ideal for this engine+model... feel free to correct me, but either of those 2 made sense!

Thanks again..
RN
Old 06-02-2007, 01:26 PM
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Big feet
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Default RE: Prop size + engine..

Yes, they sound OK, you are not looking for outright performance I expect with that model, more like a quiet engine. If that is the case try the 12x7 first, it is like using a slightly higher gear.
Old 06-03-2007, 12:28 AM
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Default RE: Prop size + engine..

APC recommend using fuel tubing as a bushing.
Old 06-05-2007, 10:47 AM
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scratchonly
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Default RE: Prop size + engine..

Where did you get this information? I checked their web site and found nothing.
Old 06-05-2007, 11:31 AM
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Default RE: Prop size + engine..

You could possibly take your engine to a hardware store and buy a length of brass, copper, or aluminum tubing that is a good fit on the shaft. Then ream the prop to fit the outer diameter of the tubing.

The following 13x6 props have a 1/4" (or smaller) hole, which can be reamed match the shaft:
APC 13x6 Sport Prop
Master Airscrew 13x6 S-2 G/F Nylon Gray Propeller
Master Airscrew 13x6 K Series G/F Nylon Propeller
A lot of the wood props are described as having a hole diameter of approximately 1/4" so there's a chance they are oversize.

I know there are lots of prop brands available. The ones I listed are what I have actually used. My engines all have 5/16" shafts So I have to ream all of my 12 and 13 inch props.

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