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

Mach Racer Flat Spin.... Oh Boy!

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Old 05-17-2009, 02:55 PM
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glowplugboy
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Default Mach Racer Flat Spin.... Oh Boy!

I suspect this has happened to others with the Mach Racer. I was doing a vertical climb with rolls and apparently fed in a bit too much up elevon, causing the Mach Racer to snap into an inverted flat spin. With no rudder, I could not recover. Fortuntately, it floated in, landing upside down in tall grass. Broke both rudders and nothing else. I believe I am going to take the fixed rudders off and make two functioning ones. Anyone else have experience with this?
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Old 05-17-2009, 05:27 PM
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Default RE: Mach Racer Flat Spin.... Oh Boy!

once with a Combat Gremlin,  it just had elevons and two ficxed fins
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Old 05-17-2009, 06:02 PM
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Default RE: Mach Racer Flat Spin.... Oh Boy!

It's pure magic when it happens, huh? If you can get the nose pointed down chop the power, it's possible to recover with no rudder. I've also done like you did and just let it land like a frisbee.
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Old 05-18-2009, 12:03 AM
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Default RE: Mach Racer Flat Spin.... Oh Boy!

Happened once already to my 2 week old with my Diamond dust.Ithought I was screwed but a very last second full power and full down elevons pointed the nose down and I was able to pull out. About 20feet to spare. I was sweating!!
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Old 05-18-2009, 06:42 PM
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Default RE: Mach Racer Flat Spin.... Oh Boy!

I had that happen with a Whiplash at about 400' so I thought I had plenty of time. Tried every corner, up, down, idle, part throttle and full, no joy.
I elected to kill the engine before splat down.  No harm done.
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Old 05-18-2009, 07:56 PM
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Default RE: Mach Racer Flat Spin.... Oh Boy!

A Whiplash in a flatspin is like a 6 pound flywheel, it should gain altitude.........
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Old 05-19-2009, 10:07 AM
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Default RE: Mach Racer Flat Spin.... Oh Boy!

I've stalled mine at over 100 mph with the elevator, but never had it flat spin on me. Maybe because I never backed off the throttle?
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Old 05-19-2009, 12:23 PM
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Default RE: Mach Racer Flat Spin.... Oh Boy!

The CG and flap throw comes into play. Speed seems to matter, too. I built a delta from RCM plans [Lil Toad] that would spin like a top with a .10, but would not do it with a .15. I think the CG was the difference.
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Old 05-20-2009, 09:01 PM
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Default RE: Mach Racer Flat Spin.... Oh Boy!


ORIGINAL: combatpigg

A Whiplash in a flatspin is like a 6 pound flywheel, it should gain altitude.........
Yup, compared to my Dust it was a pig. They were tuff thou, but it did'nt survive the full speed into the side of a cargo container. The darn thing leaped up to get it.

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Old 05-20-2009, 11:55 PM
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Default RE: Mach Racer Flat Spin.... Oh Boy!

I would have paid to see that. You probably came close to splitting an atom?
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