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

DELTA ENGINE 46FX OR 50SX ??

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Old 07-19-2007, 07:13 AM
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gary3040
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Default DELTA ENGINE 46FX OR 50SX ??

COROPLAST DELTA 36" WING CURRENTLY USING FX46
IT DOES OK, BUT WILL A 50SX ADD MUCH TO THE SPEED
OH YEAH 10X6 PROP IS WHAT I HAVE ON THE FX
JUST GATA GO FASTER
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Old 07-19-2007, 08:36 AM
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Default RE: DELTA ENGINE 46FX OR 50SX ??

Both the 46FX and 50SX are real good engines.

You might see a slight gain going to the 50SX.

For either engine, installing a jett-stream tuned exhaust, or an ultra-thrust muffler is an easy and inexpensive way to turn a ok engine into a really good engine. Instant 1200-1500 rpm gain.

As for the 10x6 ------- good choice for general flying. Depends on how your delta launches.

I would suggest giving a 9x7 a try. Let the engine turn up a bit, and the lower frontal area will help you get a touch more speed.
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Old 07-19-2007, 10:16 AM
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Mike Connor
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Default RE: DELTA ENGINE 46FX OR 50SX ??

What Bob said. The tuned mufflers mentioned really do work. A 9x7 was my choice of props for a 46FX on a clean Delta.
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Old 07-19-2007, 09:31 PM
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Default RE: DELTA ENGINE 46FX OR 50SX ??

In my experience, I have had several 46FX's and 2 OS-50SX's- I get about 800-900 more RPM's from the SX when both are equipped with APC 9x8, 5%, and Tower mufflers

15.1K 46FX
16K 50SX

It is worth mentioning I think that the difference in speed was noticeable on several speedy aircraft (Patriot, Whip) as well as a LOT more torque on 3D models...The 50SX can actually spin a 13" prop. so it is a great all-around engine.
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Old 07-20-2007, 07:20 AM
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Default RE: DELTA ENGINE 46FX OR 50SX ??

Bob, I've got a NIB OS .46 FX I'm thinking about putting on a modified Viper, and I'll most likely use a Jett stream muffler. I've always had good experiences with the stock carb, but on the Jett website I saw a picture of a .46 FX with the red carb on it. Was that just a marketing thing, or is there any difference with that upgrade?
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Old 07-20-2007, 10:40 AM
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Default RE: DELTA ENGINE 46FX OR 50SX ??

You do not have to change the carb.

Dub did that to illustrate a point, and it made for a kewl photo It makes for a nice display piece at Toledo since it has the remote needle, carb and muffler all on the same engine.

The point there was, this is what you have to do to an OS .46 to make it almost run like a jett.

Nothing at all wrong with the OS carb... just bolt on the muffler and enjoy the ride.

Bob
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