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

Rosie 45 vs 61

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Old 11-05-2009, 12:23 AM
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pikeman401
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Default Rosie 45 vs 61

I have an older Super Sportster 60 with a OS SF 61. Can I replace the old 61 with a Rossie 45 with a Ultra thrust muffler and get better performance?
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Old 11-05-2009, 05:51 AM
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Default RE: Rosie 45 vs 61

the SS has too thick of an airfoil to go very fast. the SF is a torque engine, a good match for this plane.
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Old 11-05-2009, 10:35 AM
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Default RE: Rosie 45 vs 61

or just put a ultra thrust muffler on the sf61.. good boost, easy perf gain
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Old 11-06-2009, 03:00 PM
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Default RE: Rosie 45 vs 61

So what would be a good airplane for the Rossi 45? My flying skills are at about 7 of 10. Looking for something fast and more pattern like. Not much into 3D/ Thanks.
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Old 11-06-2009, 03:12 PM
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Default RE: Rosie 45 vs 61

That's good, because the Super Sportster isn't suitable for that type of flying anyway. As a sport aerobatic/pattern ship it's a good one though! The bigger jugged and more tractable engine twirling an 11" or 12" prop is much more the type of thing for this aircraft. The Jett after market tuned mufflers are also good for a noticable boost in top end, same idea as the UltraThrust.

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Old 11-06-2009, 06:10 PM
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Default RE: Rosie 45 vs 61

Remember though that the ultra thrust mufflers must be propped accordingly. Which may not always be optimum for a sport aircraft. You need to get the RPM into the range that the pipe is tuned for. I would not bother with a quarter wave pipe on a Super Sportster.
Now if you want to go pretty fast, easy and cheap, pick up a Viper and put the rossi .45 on it.
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Old 11-06-2009, 11:28 PM
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Default RE: Rosie 45 vs 61

or a chinese .40 pattern arf, good looks and speed
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Old 11-09-2009, 11:34 PM
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Default RE: Rosie 45 vs 61

Thanks for the info. I am sort of new to the speed thing so may need a little more info. Would the Jett muffler be a better choice than the Ultra Thrust? I understand the principle of a tuned pipe (had one one a motorcycle when I was younger) but not familiar with a quarter wave pipe and where may I start to look for a Viper and/or a chinese 40 pattern arf. I'm thinking - a better muffler on the 60 and to start looking for a good plane for the 45. I also have a older Rossi 60 with an Ultra thrust muffler new in the box. Bought it for another project but changed my mind and went with a 4 stroke. I will deal with that one later. Thanks again for the info.
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