kv question

[Eric Lewis]

for an electric helicopter..would you want a higher kv for higher rpm's or a lower kv for more torque?
this would be for hard 3d

[Jake]

As long as you can keep the headspeed above a certain threshold, say 2000-3000 depending on the disc loading, go for torque.

Example:

Hornet setup #1 (I tried the recommended Blade CP setup):
4100 kv * 11.1 V * 14 tooth pinion / 180 tooth main = 3539 rpm

#2 (the recommended Hornet setup)
2208 kv * 11.1 V * 25 tooth pinion / 180 tooth main = 3404 rpm

The second setup is far less boggy and feels noticeably more powerful. The first setup required a flat hover to respool the head after every flip.

[Eric Lewis]

thanks jake...just thinkin about skorpianizing the 250

[Jake]

Is that the same motor scorpion makes for the Gaui? I had thought about it too.

Does the 250 have the same head bog we were seing on my gaui?

[Jake]

also check out the TonicX, the Gaui Scorpions kind of sucked I guess, but these were the bombnation. bottom of the page:
http://www.helidirect.com/index.php?cPath=30_321_397

And, I might be wrong about headspeed on the 250's. You might want to go with the most you can get; I think headspeed and weight instead of torque might be more of an issue for 3d flight with a micro. Don't know.

I just remember everyone oogling over insane videos of the higher kv TonicX. Check out Bert Krammerer and do whatever he does.
http://www.bertrc.com/

edit:
http://www.bertrc.com/archives/95

[Eric Lewis]

the 250 definately does not have as much head bog as the gaui did...i am very amazed on how well the 250 flew actually

i am going to try new batteries, carbon blades, and a 15t pinion to see what kind of a little machine i can make it

[Strobe]

Awesome pic from the freak !