Quick Question 450 SE

[Charliedontsurf]

Hey gang,
Just re building my old trusty 450SE, from a few years ago, just refresh my memory...What headspeed does the 450 like for basic sport flying, circuits, etc.? Got a 11 tooth pinion in it with stock motor..And if the tail wags a bit with higher headspeed, I want to turn UP the gain on a 401 gyro to stabilize it, right?
Thanks for any help/ideas...

Dr Franz in NJ

[roknHS]

With the 11T pinion........at 0 degrees of pitch using 325mm blades the RPM should be around 2800.
At 8 degrees of pitch the RPM is around 2240.

These are book values at 100% RPM

I'll let somebody else deal with the Gyro question

[Charliedontsurf]

Thanks, was just looking for a % on the throttle curve...Been used to flying my Trex500 with 80-85% throttle in Idle 1 , and just looking to see what % I should use with the 450...Maybe I'll change the pinion to get a faster headspeed with lower % curve so that I can program it like the 500... Just trying to simplify the setups to avoid confusion...
Thanks again...

Dr Franz in NJ

[Andy01]

It depends a bit on what motor you are running, but assuming a 3500kV and 3s;

3500 x 11.1 x 0.9 x 11T / 150T = 2564rpm at 100%.

Obviously because I have used 11.1V, it would be towards the end of a flight, so if running a 100% throttle curve it would start off a bit higher.

I would think that just flying circuits, you could run from 2500rpm (I use this for scale type flying), and up to 2700rpm for light sport flying.

I would suggest a 12T pinion.

I never really liked my GY401, but if it is just sloppy, then you could try a higher gain - up the gain until it just starts to wag, and then drop a couple of points. To get rid of a wag, you would generally drop the gain a little.

Of course, it could just be a loose tail due to low headspeed if you are running, say, 85% throttle curve with an 11T pinion.

Colin

[Charliedontsurf]

Thanks for the ideas and info Andy