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

Webra .40 for speed?

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Old 05-15-2007, 10:34 PM
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Duane-RCU
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Default Webra .40 for speed?

I bought one at a swap meet, want to use it for go-fast. What can I expect from this, and what prop/fuel to use? Thanks for any info.
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Old 05-16-2007, 01:54 PM
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Default RE: Webra .40 for speed?

The Webra .40 is a darn good engine. If it is in good shape...... it will be great for speed.

We use to race the W-40 and W-500-40 engines years ago.

Over time, we ran them with Jett or Ultra-thrust mufflers installed - the engine is pipe timed, and will respond great to the tuned muffler or a tuned pipe.

Bob
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Old 05-16-2007, 02:44 PM
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Default RE: Webra .40 for speed?

What kind of Webra .40 is it?

I have one of the blackheads, and although its a great running motor, I wouldn't say its a stump puller.
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Old 05-16-2007, 08:24 PM
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Default RE: Webra .40 for speed?

Are you going to use the stock muffler?
There's a guy in our club with one...I helped him get it going...
We used an APC 9X7 and Powermaster 15% and an O.S. #8 and it runs great [sm=thumbup.gif] with the stock muffler.
I didn't have my stuff with me that day, so no tach numbers, but if it's anything like my .50, and I think it is, it will run strong with an Ultra Thrust (or Jett ) muffler...might pull a 9X8 o.k. too, depending on what airplane you put it in?
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Old 05-17-2007, 08:17 AM
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Default RE: Webra .40 for speed?

It looks kind of like this one http://www.webra-austria.at/motor.ph...r=AERO&lang=EN
I'm going to throw it on the Viper, but wasn't going to waste my time if it can't out-run the ST .45 or a TT .40 Pro I use on it. I was going to use the stock muffler.
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Old 05-17-2007, 08:53 AM
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Default RE: Webra .40 for speed?

If its a speed .40, its a strong motor. Although, I think you would see limited improvement over the ST .45 or TT .40.
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Old 05-17-2007, 11:19 AM
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Default RE: Webra .40 for speed?

There's a guy on RCU named Jaka who races a Viper (I'm pretty sure it's a Viper ) with a Webra .40 Speed on it...
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Old 06-19-2007, 11:10 PM
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Default RE: Webra .40 for speed?

how does a speed .40 compare with an Irvine .40 mk II on stock mufflers ,say on a quickie with a 9x6?
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Old 06-20-2007, 10:13 PM
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Default RE: Webra .40 for speed?

I put mine on a Sonic 500 (ARF) I think I'll try a 9x7 prop on it, I really don't know anything about this engine. As soon as I get it finished, I'll see what the RPM's are between 9x6/9x7.
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