Flight Trimming

[chia]

I know, which is why I want to do it. I'll see if I can pull of a split motor stick tomorrow, and if I can't, I'll build one the way I described above.

[earlgray]

My helicopter is 4.3g and im using 1.8g of rubber. Yet it is still not flying. I am following a basic design of a rotor on top and bottom. The bottom one is fixed to the frame. my wings are 18.5cm x 3.5cm. Any help or should i explain more?

[lllazar]

Wait, are ur rotors 18.5cm on each side, or a total of 18.5cm? Im assuming they are indeed 37 cm total, but just making sure.

Also, are your rotors oriented correctly? Since the rotors spin in opposite directions, they must be built so that one provides lift when spun CCW and the other when spun CW. CW = clockwise.

[earlgray]

yes its 18.5 on each side. also they are oriented in the correct way. my heli has a total weight of 6.1g. We just did some testing today and we got it to fly but only for around 25sec. I know that is not good. I just want to get over one min, even if other helicopters will beat us by a lot. Another thing is we are using an actual rubber band, getting us only 150 winds. It is 36cm long (when cut to form a line). I read that people are getting in the 1000. Should we look into getting the helicopter rubber to replace it with our rubber band? Will it make a significant difference?

[sj]

Yes you should invest in some helicopter rubber. I believe you will significantly improve your time to possibly over a minute.

[illusionist]

Yes. This is some of the best rubber you can get for indoor duration events.
I think 1/8 would be a good starting point. Maybe 1/2 pound?

[Littleboy]

Also you could decrease the weight. 6.1 is too heavy compared to what it could/should be

[earlgray]

also... each wing is .3g for a total of 1.2g (in case you couldn't figure that out. Is that too heavy?

[lllazar]

Your rotors are only .6 grams each? How wide are they and what are they made of....it's surprising that your motor stick is so heavy.

[chia]

Also you could decrease the weight. 6.1 is too heavy compared to what it could/should be

earlgray meant 6.1 including rubber (though the actual helicopter weight of 4.3 could use some fixing).

also... each wing is .3g for a total of 1.2g (in case you couldn't figure that out. Is that too heavy?

Are you using a basswood motor stick or something? As long as you have the right dimensions, balsa wood is fine.

And I know it's been said, but: get yourself some competition rubber! illusionist provided the best link, though in my opinion 1/4 lb should suffice.