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

Sonic

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Old 01-31-2005, 10:10 PM
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1fish
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Default Sonic

I was at the LHS today looking to buy a Viper, (as most of you know I am on a quest for cheap speed) when I saw a Sonic of only 80 dollars, (about 40 less than the Viper) is this plane any good or is it just a piece of junk, what type of speed should I expect with my 46LA, and what type of prop should I use (size and pitch please)
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Old 02-01-2005, 09:57 AM
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Default RE: Sonic

Both planes are OK, but if I would have to choose between the two, I would take the Viper because its an updated design and will be a little faster.

As for the speed with the 46LA, it should be in the 90-100 mph depending on props. Hope this helps!
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Old 02-01-2005, 10:56 AM
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Default RE: Sonic

Sonic is ok.

It came from the Model Tech China Clipper design, which was an ARF copy of a Scat Cat. The Scat Cat was the 'standard' of Q-500 aircraft for most of the 1980s.

For your sport speed needs, it will suit you well. Conventinal tail.. no mixing, easy to trim.

The Viper and Preditor are nice aircraft - a bit more modern airfoil selection - and of course V-tail configuration.

Put the LA46 up front, and I would suggest starting with a sport APC 9x7 prop. It will provide a good balance. See what sort of performance and RPM you find. See if you can get a hold of an APC 8.75x8W too. Try that after the plane is trimmed out well.

Bob
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Old 02-01-2005, 05:20 PM
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AirGar
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Default RE: Sonic

If you don't want to re-cover, stay away from the Sonic. The covering is CRAP. They do however, fly great with a standard sport 46. A couple pics of mine below (wasn't quite finished)



Going for the kind of rpm's a 9x7 would give the OS LA series motors, to me is asking for trouble. Bump your oil up, if you go this way.

Have you done or seen this Bob?

I started with a APC 9x7, and ended up switching to a 9x8 with the GMS 47....it's definately Mo' better now!

Gary
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Old 02-01-2005, 07:28 PM
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Default RE: Sonic

AirGar is right about the covering, the good news is the old covering comes off
easily, and the plane can be stripped in about 15 minutes.

Dave.
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Old 02-02-2005, 11:36 AM
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Default RE: Sonic

I recommended the 9x7 to keep the rpms down on the engine (rather than a 9x6). The LA46 is a good engine, but is by no means a serious powerhouse. Smaller carb, limited ports. If it revs too high, you will lose the bottom end of the rod or the pin. A 9x8 is a possible alternative. The 9x7 should keep it below 15K . If not, then move up to the 9x8 or 8.75x9W

I have not seen the Sonic in a while. The one I saw seemed to look ok covering wise. Not sure what was done to it. The airframe in general is just fine.

Covering was not an issue with the China Clipper- it was wood ARC
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Old 02-03-2005, 12:36 AM
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Default RE: Sonic

Bob27, guys, thanks for all your information I was wondering if later when I want to go faster and buy a better motor will the Sonic be up to it, or would it be better to just go ahead and build the Diamond Dust, or a ARF viper?/ Thanks again for all the help...
Matt
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