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

Viper 500 ARF

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Old 05-10-2006, 02:18 PM
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ckoerner
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Default Viper 500 ARF

Think it would be possible to put a JET FIRE .50 on it? I just don't know how well the pipe would mount.
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Old 05-10-2006, 07:06 PM
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Default RE: Viper 500 ARF

Does this help?

BSE FIRE .50, square backplate mount, 1" rise header: I need about 9 to 10mm between the mount and the firewall for the header to clear the firewall. The pipe itself wouldn't pose a problem.
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Old 05-10-2006, 10:47 PM
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Default RE: Viper 500 ARF

Would it make sense to mount upright, and have the pipe on top of the fuse, between the V-tail?
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Old 05-11-2006, 05:41 AM
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Default RE: Viper 500 ARF

I was thinking the same thing. Would the pipe tuck over the top of the fuse, with a standoff on the pipe to hold it. It would just make it a pain to fit the wing

Tony.
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Old 05-11-2006, 08:18 AM
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Default RE: Viper 500 ARF

Thats a good point, the exhaust may be in the way of the wing bolt holes. How do they run inverted?
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Old 05-11-2006, 09:38 AM
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Default RE: Viper 500 ARF


ORIGINAL: ckoerner

Think it would be possible to put a JET FIRE .50 on it? I just don't know how well the pipe would mount.
You can do it, with a bit of tweeking. You are not racing, so mods to the fuselage are ok, and engine mounting is just generic.

Since the pipe somewhat heavy and is more aft, you can mount the engine forward a bit (longer mount rails or a spacer behind the mount) that will help you clear the header/firewall issue. You should be able to hit the CG set up like this. Backplate mount is probably not going to work without some customizing of the firewall.

Rudeboy's photos help a lot with visualizing this.

You may have to mount the engine a bit more than 90deg to the side- to get the pipe to clear the bottom of the wing. In that case, install some 1/2" triangle stock up inside the bottom of the fuel tank area behind the firewall, and you can sand-away some of the lower corner of the fuselage and firewall if needed to clear the header (no 1/4" radius to worry about). Worry not about tank placement after adding the wood inside and making the compartment smaller. If you use a bubble tank, you can install that where ever it fits

Do not run the engine upright if you can avoid it. Installation may be easier, but fuel draw uphill about 1.3" that way - bad idea. Inverted is ok, but sorta the same fuel height issue - just upside down (flooding on the ground) and we all know that nose-over is going to happen - nothing like cylinder fins full of dirt.

Somewhere in my files at home I have a photo of an old scat-cat that was built with a round backplate, and a FIRE .46 engine some years ago. The front end of the plane was customized to conform to the 2" round backplate. Looked kinda nice.
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Old 05-11-2006, 10:59 AM
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Default RE: Viper 500 ARF

Thanks for all the info. The local hobby shop has one sitting there saying buy me. Without buying a new engine, the only thing I have to put on it would be my JETT FIRE .50.
How do you think it would compare speed wise with my Diamond Dust?
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Old 05-11-2006, 06:40 PM
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Default RE: Viper 500 ARF


ORIGINAL: ckoerner
How do you think it would compare speed wise with my Diamond Dust?
My Dust was faster then my Q-500 with the same engine.
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Old 05-12-2006, 08:09 AM
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Default RE: Viper 500 ARF

ORIGINAL: Mike Connor


ORIGINAL: ckoerner
How do you think it would compare speed wise with my Diamond Dust?
My Dust was faster then my Q-500 with the same engine.

I want something faster then my dust. Is there anything out there that will be faster with the same engine? I love my Dust, but want something different.
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Old 05-12-2006, 10:23 AM
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Default RE: Viper 500 ARF

A quickie 500 with 5 inches cut off each wing tip and no landing gear will be faster with the same engine.
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Old 05-12-2006, 10:48 AM
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Default RE: Viper 500 ARF


ORIGINAL: ckoerner

ORIGINAL: Mike Connor


ORIGINAL: ckoerner
How do you think it would compare speed wise with my Diamond Dust?
My Dust was faster then my Q-500 with the same engine.

I want something faster then my dust. Is there anything out there that will be faster with the same engine? I love my Dust, but want something different.
If I recall your engine is what would be conisidered a FIRE-50LX.
Mounted on a Q-500, its going to perform just like a full-blown 428 racing .40 engine - maybe better.
So figure the 155-160 range is not out of the question. Maybe a bit more.

As noted, clip the wings a few inches and gain a few more mph. But Id not recommend going below a 45" span, just for wing loading and performance considerations.

Something you might want to consider..... look up the old threads from Angel-RC on here. Send him a PM and see if he might have a Rifel available set up with a rear-exhaust tunnel
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