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Old 07-12-2007, 09:57 AM   #1
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somthin extra

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Hi Guys,

I have a new somthin extra and I can't get it to Knife edge.
It weighs 5.1lbs has an os ax .46 on it. flys great but will not knife edge even with an inch added to the rudder when I built it.
any hints would be helpful
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Harry Ketterer MAAC# 68725
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Work is what you do for the love of it. My work is model-building. A job is what I do so I can afford to do my work. SPADS RULE
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Old 07-12-2007, 12:11 PM   #2
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Harry......You definitely shouldn't have trouble seeing it

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Old 07-12-2007, 03:03 PM   #3
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I'm gonna guess at just not enough side area to keep that thing up. But some other things to consider: First are you using a large enough prop to get lots of airflow over the surfaces, second is your rudder servo strong enough to hold that plane in KE, third is you linkage slop free so that your not sacrificing any amount of throw, and last is your plane nose heavy?? Nose heavy planes do not like to hold a KE, the more tail heavy the easier it will hold.

Just my thoughts....

Good Luck,

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Old 07-12-2007, 03:13 PM   #4
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In addition to whats been said (which is all good info), another useful trick is to pitch up slightly before you roll into knife edge.

Many airplanes have enough rudder to maintain knife edge, but not enough authority to lift the nose in knife edge. They seem to be happier if you put them into the nose high attitude before rolling to knife edge.
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Old 07-12-2007, 08:07 PM   #5
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blowback is a biotch.
you added one inch to the rudder by doing this you need a bigger servo. A standard servo on 4.8v will NOT hold. Going to 6v will be very helpful.
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