Corkscrew instead of Looping, whats the deal
11-01-2002, 03:40 PM
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Corkscrew instead of Looping, whats the deal
I just got my Modeltech Luckystick up and flying, but when I go to do a loop it does a corkscrew instead, but everything else checks out, it tracks straight with hands off in flying, banks great, and will spiral with no problem, its just my loops that are acting funny, what could it be and what should I do to correct it?
11-01-2002, 03:54 PM
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Corkscrew instead of Looping, whats the deal
Sounds like your aircraft is not balanced laterally (heavier on one side than the other). That will cause it to corkscrew in a loop.
11-01-2002, 04:11 PM
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Corkscrew instead of Looping, whats the deal
dont think it has anything to do with lateral balance, you have too much elevator throw, what its doing is snapping out on you. decrease the low rates and watch it loop
11-01-2002, 04:36 PM
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Corkscrew instead of Looping, whats the deal
Could be lateral balance.
Snapping out of a loop is much different than a corkscrew, doubt this is it.
Sounds more like the horizontal stabilizer (or main wing)is not properly aligned. This could be in several forms.
It may not be perpendicular to the rudder, it may not be parallel with the main wing (either up and down or front to back of plane).
Snapping out of a loop is much different than a corkscrew, doubt this is it.
Sounds more like the horizontal stabilizer (or main wing)is not properly aligned. This could be in several forms.
It may not be perpendicular to the rudder, it may not be parallel with the main wing (either up and down or front to back of plane).
11-01-2002, 04:53 PM
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Corkscrew instead of Looping, whats the deal
Sounds like lateral balance to me too. And it's easy to check.
First, eyeball everything on the plane to make sure everything lines up (stab level with wing, rudder 90degrees to stab and straight front to back, etc.).
Next, find some way to hold the plane by it's prop. You can have someone hold it, or put a loop of string around the prop shaft and suspend it from the ceiling, or even just set the spinner on a can of paint or something.
Next, lift the plane with one finger at the rear-most part of the fuse, and hold the plane level. Let go and see which way it tips, level it again, and let it go. Do this 3 or 4 times to see if it tips the same way each time. If it does, add some weight to the "light" wingtip and try it again.
Keep doing this until the plane either balances, or falls to either side equally. Then attach the weights permanently (I usually put a small hole in the wingtip, epoxy them in, then patch the covering over the hole).
The reason this is so important is that as the plane flies, it wants to tip to the heavy wing, so you trim the ailerons so it flies level (IE the aileron is pushing UP on the heavy wing). But when you go inverted, the aileron is now pushing DOWN on the heavy wing, (which is already wanting to tip down) and the plane will corkscrew.
First, eyeball everything on the plane to make sure everything lines up (stab level with wing, rudder 90degrees to stab and straight front to back, etc.).
Next, find some way to hold the plane by it's prop. You can have someone hold it, or put a loop of string around the prop shaft and suspend it from the ceiling, or even just set the spinner on a can of paint or something.
Next, lift the plane with one finger at the rear-most part of the fuse, and hold the plane level. Let go and see which way it tips, level it again, and let it go. Do this 3 or 4 times to see if it tips the same way each time. If it does, add some weight to the "light" wingtip and try it again.
Keep doing this until the plane either balances, or falls to either side equally. Then attach the weights permanently (I usually put a small hole in the wingtip, epoxy them in, then patch the covering over the hole).
The reason this is so important is that as the plane flies, it wants to tip to the heavy wing, so you trim the ailerons so it flies level (IE the aileron is pushing UP on the heavy wing). But when you go inverted, the aileron is now pushing DOWN on the heavy wing, (which is already wanting to tip down) and the plane will corkscrew.
11-09-2002, 03:53 AM
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Corkscrew instead of Looping, whats the deal
I think your CG is too far back and it is snapping out not corkscrewing. The lateral balance has some to do with this as well but i had experenced the same thing on a 120 Balsa Nova that I wanted to torque roll.I kept moving the cg back to the point where it wanted to snap out when I went to do a loop. You may have a little to much throw in the ele. Add some weight to the nose and see if it doesn"t straighten up.
Markus
my 2cents.
Markus
my 2cents.
11-09-2002, 06:49 PM
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Corkscrew instead of Looping, whats the deal
If the coupling between the two elevator half's is slightly limber (lets the elevators twist relative to each half when you move the side with the horn with some resistance on the other half) you will get a small aileron type action at full up. The side with the horn will have more effect than the other side does.
11-10-2002, 02:42 AM
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Corkscrew instead of Looping, whats the deal
In addition to what's already been mentioned, you might want to check your rudder trim. It can be off and the plane seem to fly fine, untill you try a loop. Just a thought...
