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

DDust rolls out of tight loops?

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Old 04-20-2003, 12:43 AM
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rsieminski
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Default DDust rolls out of tight loops?

I'm afraid to go any further back, it's at about 11.5% of the MAC. Rolling out of a loop is usually a sign of a tail heavy plane, but this can't be tail heavy, Right? Will moving the CG back, somehow help a delta? Loops and turns are wide, but more throw, causes it to roll out. Deadstick, it runs out of elevator.
Whatcha think?
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Old 04-20-2003, 12:51 AM
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soarrich
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Default DDust rolls out of tight loops?

My Dust does the samething, rolls out on the second tight loop to the right. My has a OS .25v in it and is balanced as per the plans.
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Old 04-20-2003, 01:21 AM
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daven
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Default DDust rolls out of tight loops?

Make sure both Elevons are moving the EXACT same amount. More throw on one side would cause this.
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Old 04-20-2003, 01:23 AM
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Default DDust rolls out of tight loops?

Nah, it's balanced laterally and both elevons have matched servos, moving exactly the same distance and speed.
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Old 04-20-2003, 02:21 AM
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ChuckAuger
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Default DDust rolls out of tight loops?

I tend to think rolling out of loops is more of a nose heavy situation...you are too nose heavy, and putting in enough throw to get a tight loop is producing the stall.

If your CG was a bit farther aft, the amount of throw needed to loop would be less. Being too nose heavy will cause you to stall before you get a loop.

Try it, I know it sounds counter-intuitive, but it works.
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Old 04-20-2003, 12:40 PM
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Default DDust rolls out of tight loops?

I will slooooowly, move it back and see if it helps. Thanks. Is the aft CG going to make it more dificult to launch?
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Old 04-21-2003, 06:05 PM
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Default DDust rolls out of tight loops?

I agree with Chuck...it is nose heavy...

Also setting your plane up less nose heavy will generally help in hand launching situations, because the plane will not tend to drop the nose at low speeds...

Of course, like everything in life, don't overdo things.... I wouldn't want to be flying a small high speed delta on high throws with the CG too far AFT...
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