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!/2 A APC props for pylon

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!/2 A APC props for pylon

Old 03-08-2010, 10:00 PM
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britcardoc
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Default !/2 A APC props for pylon

Our club is going to do a series of 1/2 A pylon racing. We all have TD 049 and 051's. What is the right APC prop? Thanks.
Old 03-08-2010, 10:17 PM
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combatpigg
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Default RE: !/2 A APC props for pylon

Are you going to use AMA rule book planes? The "rule book plane" with a TD moves pretty good with a 5x3. If you are going to allow smaller, thinner and lighter planes, then the 4.2x4 might work. APC makes other props in this range.

The nice thing about the Cox rubber 5x3 is that it's basically a life time prop. A decent TD should turn it 22,000 to 24,000 on 30-40% nitro. If you limit the nitro to 15%, you'll more than double the plug life..

Our local club's record is held by a Cox rubber 5x3, which seems pretty amazing.


Old 03-08-2010, 11:28 PM
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Default RE: !/2 A APC props for pylon

There are other 1/2 A Props available besides the APC's. Larry Driskill at kittingittogether.com and George Cleveland at http://pages.prodigy.net/gcleveland_grsmodels/
carry CF insert 1/2 A props in a number of different diameters and pitches.
Old 03-09-2010, 12:08 PM
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jeffie8696
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Default RE: !/2 A APC props for pylon

Sig has Kavan nylon props but the smallest is a 6X4. However you can get it in either nylon or glass filled.
Old 03-09-2010, 03:47 PM
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Default RE: !/2 A APC props for pylon

I like the APC 5x3 and the Cox 5x3, the standard prop without the safety tips. A little harder to find these days. I've seen a couple of the ones with the safety tips throw blades. A nice DNU was torn up pretty bad in flight when that happened. The rubber ducky Cox prop seems much safer than the sharp, stiff APC unit but they both run well. The Cox prop bolts right up and the APC unit will need to be adapted to fit the shaft. No biggie, just something to consider. Wish my club would do an event like that but I'm the only member who flies 1/2A.
Old 03-09-2010, 08:08 PM
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Default RE: !/2 A APC props for pylon


ORIGINAL: jeffie8696

Sig has Kavan nylon props but the smallest is a 6X4. However you can get it in either nylon or glass filled.
Too much prop for these engines IMHO, esp for pylon racing. A 6x4 lugs Cox .049s down pretty good. Yeah some guys run them for this and that, but they really hold the engines back, and any time I ran a 6x4 on an .049 the results were never an improvement over a 6-3 or smaller.

MJD

Old 03-09-2010, 08:26 PM
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Default RE: !/2 A APC props for pylon

I usually run 6x3
Old 03-09-2010, 10:16 PM
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Default RE: !/2 A APC props for pylon

I never had complaints from my .049's on 6-3 props, and those are the biggest prop I'll use. A 6-4 has 33% more pitch - it's a big step from 3" pitch - and I never thought much of the results.

Mind you Vic, you're not going to win many pylon races on a 6-3.

MJD
Old 03-10-2010, 09:20 PM
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Default RE: !/2 A APC props for pylon

Most races are won in the thumb not on the motor.
Old 03-10-2010, 09:56 PM
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Default RE: !/2 A APC props for pylon

I agree, but I'd still at least use a 5-3 then leave the rest to my thumbs, all 10 of them.

MJD
Old 03-10-2010, 11:14 PM
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Default RE: !/2 A APC props for pylon

All these things are true. BUT 30,000 rpms with average thumbs wins out over 24,000 rpms with another set of average thumbs every time. My problem is the one to beat has really good thumbs and 32,000 rpms.
Old 03-10-2010, 11:19 PM
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Default RE: !/2 A APC props for pylon

You'll get lapped around here if you aren't running about 90 seconds on the 300 foot, 2 pole course. Local rules for engines and planes come into play, our planes are AMA rule book with stock TDs or AMEs.

The only leeway you get around here is prop choice.

The prop that APC specifically calls 1/2A pylon is a 4.5x4....but you have to be a good pilot to keep the plane locked in the groove or else this much prop load doesn't re-accelerate well.

The most important thing is to practice and practice some more. Even just an hour or 2 per week really makes a difference.
Old 03-11-2010, 12:51 AM
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Default RE: !/2 A APC props for pylon

Stock? Stock? What's stock? I didn't know we were talking about cows, horses and pigs here. Basically our only rules are .061 cu. in. disp, $110.00 engine cost and 200 sq. in. wing area.
We're doing the 3 pole 300' X 80' 10 laps in about 1 min 10 seconds. I like the 4.2 X 2.5 Carbon Tow insert props on my AME's. Like I said in an earlier post I get around 30,000 rpms with that prop on 35% Sig fuel. I seem to run in the middle of the pack.
Old 03-11-2010, 01:22 AM
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Default RE: !/2 A APC props for pylon

Mike, you guys run your show more to my liking. I would like to see our local racing allow Cyclons, but the guys who make the rules here already have AMEs stockpiled into the next century. I'll burn up 3 or 4 AMEs before a Cyclon even gets loosened up a little.
Old 03-11-2010, 01:57 PM
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Default RE: !/2 A APC props for pylon

Can a nylon prop be safely trimmed to ?"s
Old 03-11-2010, 04:15 PM
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Default RE: !/2 A APC props for pylon

With the plastic props that have the Carbon Fiber Tow inside, I've done this many times. I even have a jig built to hold the prop against my disk sander at any length you adjust it to.
Old 03-11-2010, 06:46 PM
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Default RE: !/2 A APC props for pylon

Yes, I've never seen a prop that couldn't be cut down**. Stick whatever size drill bit [that the prop has] into a hunk of wood and C clamp it "X" amount of distance from a jig saw or bandsaw blade...now you're set to go. Chop away. It helps to have a fine tooth blade. You could also use a razor saw.

**APCs don't work well cut down too much unless you recontour the whole blade. MAS and COX props respond very well to blunt tip style cuts.
Old 03-11-2010, 07:05 PM
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Default RE: !/2 A APC props for pylon

What do you think of the APC 5.7x3 prop?
Old 03-11-2010, 07:17 PM
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Default RE: !/2 A APC props for pylon

I think APC is the smartest, most "in tune" company out there.... when it comes to making props.
They must fly what they sell.
Every prop they make has a real application, often based on what competitors want.
The 5.7x3, [I was told] was made for the Norvel .061s.
It's a great all around prop if you don't mind having to make a stupid little adapter for it.
It's always puzzled me why they don't furnish typical adapters for them, or at least make adapters available seperately.
Their website is a convoluted mess, too.....but like I said, when it comes to making props, they're hard to beat.
Old 03-12-2010, 10:12 AM
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Default RE: !/2 A APC props for pylon


ORIGINAL: airraptor

What do you think of the APC 5.7x3 prop?
Great prop for 1/2A sport aircraft. Lots of pull, I like 'em. Not a pylon prop unless you are competitive at 50-55 mph.

MJD
Old 03-12-2010, 12:58 PM
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Default RE: !/2 A APC props for pylon

If you can find them, the black Tornado 5-3 is a good one to try also. The tips of the props
are popsicle stick shaped, they are not quite as hard a material as the Cox grey 5-3.
They will flex a little, have worked great for me.
Old 03-12-2010, 03:23 PM
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Default RE: !/2 A APC props for pylon

just wondering i run that prop on my electric fun jet and at 32,000 it has alot of thrust. lol
Old 03-12-2010, 04:30 PM
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Default RE: !/2 A APC props for pylon

Yeah, at 32K I bet it would! Should be what, up in the mid 20 ounces or so?
Old 03-12-2010, 06:36 PM
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Default RE: !/2 A APC props for pylon

lol more than that. the FJ 31 ounces with battery. i can go to vert let it almost stop and then go to full throttle and accels better than any plane i have seen lol it would go 15-80 in about 3 seconds. the APC gas 6x4 was the best though. I am working on a new motor that will spin it close to 40,000 on a 5s pack any way got off track.
Old 03-13-2010, 07:21 PM
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Default RE: !/2 A APC props for pylon

This is what I know. I have flown with and against mikegordon10 for years he knows his stuff. If you want to hear it straight up and get the real facts he's the one to talk to.

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