Rubber

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smartkid222
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Rubber

Post by smartkid222 » August 26th, 2010, 10:12 am

Creating new topic
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Re: Rubber

Post by obstinate » August 26th, 2010, 10:19 pm

sorry...kind of new to this event.
how many times can we expect to wind the rubber?

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Re: Rubber

Post by smartkid222 » August 27th, 2010, 7:10 am

If you are familiar with Wright Stuff, think of a similar amount to that. You are gonna use a winder to wind so total winds can be over 1000, depending on what size rubber you use.
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Re: Rubber

Post by illusionist » August 29th, 2010, 1:53 pm

I'm using a 1.5 gram loop of 3/32 rubber, and its not enough power to provide lift for my helicopter. Once I use two of those rubber motors, then I have enough lift. Could it be that my helicopter is overweight (It ways in the range of 5 - 6.5 grams without rubber motors)? Any suggestions?
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Re: Rubber

Post by smartkid222 » August 29th, 2010, 2:14 pm

Thats part of it but you might need thicker rubber if your helicopter was normal weight anyway.
If by using two, you mean that you are using a total of 3 grams, try using a double strand (4 strands total) of rubber that total 1.5grams if you don't have anything thicker.
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Re: Rubber

Post by illusionist » August 29th, 2010, 6:19 pm

That is correct, for right now, I am using a total of 3 grams, which is probably going to be against the rules anyway. Double strand? Do you mean taking one loop and twisting it four times so that it is 4 strands thick? Or, taking two loops, and doubling each of them?
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Re: Rubber

Post by illusionist » August 29th, 2010, 6:27 pm

About the larger thickness, what would be ideal? 1/8, 3/16, or 1/4 ?
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Re: Rubber

Post by jander14indoor » August 30th, 2010, 4:38 am

Weight is CRITICAL. Excess weight is bad. Any recommendation for rubber size for a 4 gm copter will just be completely WRONG for heavier copter and KILL flight time.

I'm pretty sure you will be limited to 1.5 gm rubber, don't fly with more! If your copter is heavier, just user thicker 1.5 gm motors or increase the strands of thinner motors. Or better yet, make a lighter copter.

You CAN use uneven numbers of strands, though its a little tricky. Tie a loop in both ends of the band. Hook one end over the prop hook, loop strand around tail hook, around prop hook again and the other end loop then goes over the tail hook giving you three strands as an example.

So, if you want to fly well, FIRST learn to build to weight. Then play with rubber size and rotor pitch.

Jeff Anderson
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Re: Rubber

Post by illusionist » August 30th, 2010, 7:46 am

Ok, I don't know exactly how much my helicopter weighs yet, I'm guessing that it is around 5-6 based on a comparison with my 7 gram Wright Stuff plane. I'll find out the actual weight once school starts.
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Re: Rubber

Post by illusionist » August 30th, 2010, 10:04 am

jander14indoor wrote:Weight is CRITICAL. Excess weight is bad. Any recommendation for rubber size for a 4 gm copter will just be completely WRONG for heavier copter and KILL flight time.

I'm pretty sure you will be limited to 1.5 gm rubber, don't fly with more! If your copter is heavier, just user thicker 1.5 gm motors or increase the strands of thinner motors. Or better yet, make a lighter copter.

You CAN use uneven numbers of strands, though its a little tricky. Tie a loop in both ends of the band. Hook one end over the prop hook, loop strand around tail hook, around prop hook again and the other end loop then goes over the tail hook giving you three strands as an example.

So, if you want to fly well, FIRST learn to build to weight. Then play with rubber size and rotor pitch.

Jeff Anderson
Livonia, MI
Thanks so much Jeff, I took off a lot of weight from the bottom of my free spinning rotor, and voila! I got 28 seconds in my small foyer!
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Rule 7d. "Event Supervisors are allowed to break any competitors' devices" -bearasauras

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