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The cord is the distance from the leading edge to the trailing edge. The leading edge is the front of the stabilizer and the trailling edge is the back. If that didnt make any sense i'll try to draw it.

<20cm
___________________________
|...................................|
|...................................| <6cm
|...................................|
|_________________________|

Ignore the dots. The straight unbroken lines are the leading and trailing edges. They are also known as spars. The | are the side ribs. those make up the cord. I hope that helped

Ok so if 20cm is the lenght of the horizontal stabilizer, and 1/16 is the height, and 6cm was the depth(or width) the 6cm depth would be my cord... right?

Also is there any rule saying you can only have one stabilizer? i'm planning on making a vertical stabilizer underneath my horizontal one, I know the plane can only have one wing. Also what is considered the motor of the plane?

I'm pretty sure that you can only have one stab although I'm not positive. It says it must be a monoplane/one winged plane. I would not do that just to play it safe with the rules.

Well then do you mean you can only have one wing, not even one stabilier?

as far i know you are only allowed one wing and one stabilizer. A second stabilizer would automaticly be considred a second wing and thus not allowed.

One wing, 40 cm max span, no chord limit, ONLY one horizontal stabilizer has been allowed in the past when the word monoplane was in the rules, 20 cm span by 6 cm chord. You can have ANY number of vertical surfaces you want, any size.

But, extra vertical surfaces over one or two in the rear is just extra drag. Too large of a vertical stab is extra drag, and can be a stability problem too. Maybe tip plates, but unless done right, these just add excess drag too.

If you are new to this event, don't overthink the design folks. This event is about test and evaluation primarily, design a very distant second. Get a basic plane AT MINIMUM WEIGHT flying quickly and practice lots. Learning to trim is FAR more important than design details. At least half the planes I see at contests in the "race to the floor" COULD fly if trimmed right. Until you can consistently hit 80 to 90% of the national times, you can't distinguish the effects of most design differences.

Jeff Anderson
Livonia, MI

bob3443 wrote:Ok so if 20cm is the lenght of the horizontal stabilizer, and 1/16 is the height, and 6cm was the depth(or width) the 6cm depth would be my cord... right?

Also is there any rule saying you can only have one stabilizer? i'm planning on making a vertical stabilizer underneath my horizontal one, I know the plane can only have one wing. Also what is considered the motor of the plane?

The motor is the rubber and any attachments which cannot be removed from it while it is tied (O-rings).

Pleiades wrote:Try this

Be careful when using this. Even though this is on the official scioly web site, the official rules overrules anything written on that sample scoresheet. Also the scoresheet may not have every detail (requirement/restrictions) on there, so make sure you get a copy of the official rules.

What are good rubber band sizes to use?

Depends on your design...usually 3/32" is a good starting point.