Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

OS 46 AX

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Old 11-23-2009, 08:22 PM
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Default OS 46 AX

Are there any speed secrets for a 46 Ax that I could use and keep it stock looking?

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Old 11-23-2009, 08:24 PM
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Default RE: OS 46 AX

I run mine with a magnum 52 carb...seems to wind it up a little more
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Old 11-23-2009, 11:10 PM
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Default RE: OS 46 AX

Remove the head shim, run 15% fuel, a 10x7 apc prop and you can hit 120 with a clean airframe.

The motor is pretty good box stock, haven't tried to do much with it.
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Old 11-24-2009, 05:03 PM
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Default RE: OS 46 AX

Daven,

With what muffler are you using? Are you keeping the baffle inside the stock muffler?

Ihave messed with shims.....they run best stock.
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Old 01-18-2010, 09:47 PM
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Default RE: OS 46 AX

Thank's for all the info guy's, it will give me a good starting point.
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Old 01-18-2010, 10:27 PM
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Default RE: OS 46 AX


ORIGINAL: fomocokid

Are there any speed secrets for a 46 Ax that I could use and keep it stock looking?

Why worry if it looks stock or not?
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Old 01-19-2010, 12:23 AM
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Default RE: OS 46 AX


ORIGINAL: combatpigg


ORIGINAL: fomocokid

Are there any speed secrets for a 46 Ax that I could use and keep it stock looking?

Why worry if it looks stock or not?
Hmmmmm, I vas vunderink the same thing. Could it be zat zis is for a stock class? ???
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Old 01-19-2010, 12:27 AM
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Default RE: OS 46 AX

They would "rip him a new one" if he asked the same question at the pylon forum......[:-]

Anyone with any self respect would never cheat at racing, just ask Richard Petty.
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Old 01-19-2010, 06:52 AM
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Default RE: OS 46 AX

We do remove the baffle. Run a cold plug, K&B 1L, K&B HP, or McCoy #9.
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Old 01-19-2010, 08:30 AM
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Default RE: OS 46 AX


ORIGINAL: combatpigg
Anyone with any self respect would never cheat at racing, just ask Richard Petty.
Maybe it's just to fool his buddies and amaze fellow club members.

Hey CP, I know who Richard Petty is but is there a story behind that? I don't follow racing but dig it when I do watch.

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Old 01-19-2010, 10:51 AM
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Default RE: OS 46 AX

never cheat, just bend the hell out of the rules creatively[>:][:-][8D]
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Old 01-19-2010, 11:08 AM
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Default RE: OS 46 AX


ORIGINAL: combatpigg

They would ''rip him a new one'' if he asked the same question at the pylon forum......[:-]

Anyone with any self respect would never cheat at racing, just ask Richard Petty.
Forget my question CP - I googled "Richard Petty cheating" and found the scoop.

My old boss used to race this and that and told us about all kinds of stuff that went on, including cheats just like on video games - tap the brake or push some other button to the rhythm of La Bamba or some such thing, and the ECU would switch fuel maps while in the starting grid. And back again later.

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Old 01-19-2010, 11:09 AM
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Default RE: OS 46 AX

MJD, when I was a kid, ABC Wide World of Sports reported that a race he won had not really been won until a few cars got torn down and looked at. The way I remember the story, his big engine needed a restrictor plate between the carb and the manifold. At the inspection they do prior to qualifying or racing, the plate would look OK.......15/16" holes [or something like that].

The inner 1/8" of the holes was built up with a low temp material that melted away and gave a performance boost. Any way, there have been a lot of cheaters. Sometimes it is hard for the judges to pick a winner. About 10-15 years ago a team was disqualified and heavily fined for using after market studs instead of genuine factory studs to hold down a carburetor.

They have a ton of rules, so you almost need a lawyer to compete there, I'll bet.
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Old 01-19-2010, 11:45 AM
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Default RE: OS 46 AX

Tear down before and after - does that leave any time for racing..?

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Old 01-19-2010, 03:00 PM
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Default RE: OS 46 AX

They tear down at the nats also.

Finish in the top five and your plane will be impounded as you come in from your last heat. You tear the motor down in front of inspectors (including Dub Jett) as every piece is measured, checked, and given the once over for modifications.

You are not awarded a finish place until after a successfull tear down. Even if you know your motor is box stock, the temperature seems to rise about 10degrees under the tent as your pulling it apart.
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Old 01-19-2010, 03:02 PM
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Default RE: OS 46 AX

I can imagine. Luckily tearing down a single cylinder two stroke ain't all that bad, though I could do without the need on a daily basis.

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Old 01-19-2010, 04:32 PM
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Default RE: OS 46 AX

Not bad at all, and after about 15 flights I like to tear them down anyway.
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Old 01-19-2010, 05:13 PM
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Default RE: OS 46 AX

The old rulebook I'm looking through says [for Q40] that the engines shall be unmodified.......but they say elsewhere that the venturis can be modified and that other manufacturer's parts can be substituted. Reading it this way, a long stroke kit could be substituted.
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Old 01-19-2010, 07:35 PM
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Default RE: OS 46 AX

The venturi can be modified in Q40, but not to exceed a no-go gauge of 9mm, in Q500 you are not allowed to modify.

Molded plastic has a little tolerance, and I guess they allow you to get right up to the limit while allowing the manufacturer a chance to make them plastic without fear of being to big.

Theres a few things that can be substituted (like bearings and shims), but without a new case, you couldn't fit a LS piston / sleeve into a SS case. Henry has been converting these at a cost by removing some material under the crank and some sort of ring up top to extend the case for the longer stroke.

Still some gray areas in there, but for the most part, pretty solid.
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Old 01-19-2010, 08:43 PM
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Default RE: OS 46 AX

and buttered cranks....hehe
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Old 01-20-2010, 08:16 AM
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Default RE: OS 46 AX


ORIGINAL: lfinney

and buttered cranks....hehe

You beat me to the punch on that one...
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Old 02-09-2010, 01:19 PM
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Default RE: OS 46 AX

Where can I get different thickness sized head shims for the 46Ax?
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Old 02-09-2010, 01:33 PM
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Default RE: OS 46 AX


ORIGINAL: combatpigg

They would ''rip him a new one'' if he asked the same question at the pylon forum......[:-]

Anyone with any self respect would never cheat at racing, just ask Richard Petty.
combatpigg, Thats why I'm in this forum, and I don't really care what they think in other forum's. I would never think of bending the rules nor would my competitors I just read them differently.... :-)
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