hk 500gt headspeed

[beertema]

hello,

im busy here preparing a hk500gt that i could take over second hand.
now im looking into my throttle curves and the settings i should use.

with a calculator i come to a head speed of around 2350 rpm @ 4.2/cell and 2000@3.7/cell
the only guideline i could find is in the original trex 500 fly bar heli, and they are talking in the range of 2900rpm

data as far i can find on my heli,

1300kv motor
13 tooth pinion
162 tooth mean gear
using a 60A esc
6S 3000mah lipo

i won't be using it for any planned 3d action, only hoovering and field circuits for now.
so i won't go extreme on the pitch settings as well, -3 to + 7
so will the headspeed do at a 100% throttle curve?

i like to fly in idle up. i tried flying both in idle up and with a 0-100% throttle curve. with a small mcpx that i use to play with different settings in my remote. but i find the idle up the most pleasant to fly.

thanks in advance

erik

[feudallordcult]

Erik, methinks the 60a esc may not be sufficient. U can try Mr Mel's headspeed calculator for starters. My mind is a little screwed after a day's meeting. Perhaps experts could chime in to help?

[perfect1]

Base on the data you gave us, I did a calculation: 22.2v * 1300kv*13=375180. 375180/162 and you have 2316rpm assuming 100% efficiency. Multiply by 80 percent will be 1852rpm.
My trex 500 running at about 2600rpm.

[beertema]

Thanks for the answers

Been looking at other forums as well and found there that the scale heli fly with as head speed as low as 1700,
So I should be oke. I've seen the heli fly before. Only thing left is to try it out this weekend, if I'm not happy I'm going for a 1600kv motor

[Adrianli]

U no need to change motor lah. Just change the pinion to higher teeth to increase the RPM.


U can fly at 1800rpm but u must be experienced enough. Esp when it is windy. Control is a bit sluggish, recovery from error/mistake is slow.




I have two 500 heli, one 1900kv motor running on 4S and another 1400kv motor running on 6S. Both RPM :
Normal curve - 2300rpm.
Idle-up1 (Governor mode) - 2400rpm.
Idle-up2 (Governor mode) - 2500rpm.

[beertema]

so if i change to a 14 pinion that should do the magic,
some calc

full lipo
25.2*1300*14= 458640
458640/162=2831 rpm @ 100% effeciency
2494*0.80= 2264 rpm

lipo at 3.7v cell
22.2*1300*14= 404040
404040/162=2494 rpm @ 100% effeciency
2494*0.80= 1995 rpm

going to look around for it!


thanks guys