My first maiden flight for Hornet II

[Super-Hornet]

Hi all

Today (June 05, 2004, 10:30am) I did my first maiden flight for Hornet II!! Yeah. Well, just hovering at living room of 15cm to 30cm height...while on the phone with best friend.

The finishing flight ends up with rotor blades hitting and scratching one of the table leg and the rotor blades collapse and hit the Horizontal stabilator and the stabilator flew off (Luckily I only do a tiny CA when assemble it). Quick check and everything looks ok. Blades ok also. Looks like the Carbon Fiber blades is strong. It happen when I notice it going to kiss the table so I power down quick but not quick enough that it hit the table.

As for tail wagging, my gyro is exactly behind the main shaft (0 cm away) and the gain is 75%. Tail servo is GWS Naro. Initially the tail do hunting. I reduce the gain to 53% and everything looks good!!!

I'm using HA2015-4100 with 12Teeth Pinion. Going to try higher pinion soon.

Super-Hornet

[HZM]

don do it in yr house. The headspeed is a lot faster, every cyclic response is very sensitive. I maiden my hornet in my vacant flat. A multi stirey carpark w/o wind is best.


Mike

[Super-Hornet]

I do second flight with 15Teeth pinion again and so far so good. Going downstair to HDB void deck to try now.

Super-Hornet

[D.Yeo]

15 tooth ? which motor ? your himaxx?

what batterys?


i won't dare fly my hornet in my house man.

[ammo]

On the contrary, i used to fly my hornet cp 95% in my living room, landing on coffee table and on top of the TV, then fly to kitchen and disturb my mother while she's cooking dinner.
lot's of fun, but be careful.

[D.Yeo]

man that's bloody scary.


either that or you have a really big house.

[ammo]

It gets your blood going real fast and sure is scared as hell the first few times i flew that way. trying running a fan at speed 2 at ground level and u'll get some weather training.

and no i only live in norm 4 room flat.

[Super-Hornet]

Hi all

I'm using 15Teeth on Himax HA2015-4100. That is 4100KV.

Based on Mike given formula, I hover at 45% Throttle... That means:

3Cell LiPoly = 12.6V... Assume it is 12V.

Then 12V * 45% = 5.4V
Then 5.4V * 4100KV = 22140RPM.
Gear Ratio is 180:15 = 12:1
So, 22140RPM / 12 = 1845RPM

Super-Hornet

[BonJour Brat]

Congrats on getting ur h2 up too!
I only tested my h2 at home when they're on 2s.. Good thing i dint test them when i had the 3s etecs on.. if i did, i would probably have a hole in the ceiling now..
Scared the s*** out of me yesterday as mike and ray witnessed that even on a brushed motor, the h2 can rocket pretty fast on 3s lipos! Almost lost a pair of brand new blades.. phew..

[HZM]

Originally posted by Super-Hornet


Based on Mike given formula, I hover at 45% Throttle... That means:

3Cell LiPoly = 12.6V... Assume it is 12V.

Then 12V * 45% = 5.4V
Then 5.4V * 4100KV = 22140RPM.
Gear Ratio is 180:15 = 12:1
So, 22140RPM / 12 = 1845RPM

Super-Hornet

Hur? I dint know I provide any formula. In fact I did a search cos I need to est my headspeed..... so I will base on yr formula.

Btw, yr 3S nominal voltage seems very high.... I tot 3S nominal is 11.1V, max at 12.6 ? So I am giving a 16.7% voltage drop when loaded and give me 10.5V instead

As per aircraft world, my Hacker B20-26 is 3450kv, so I should be

(3450 X 10.5 x 14T ) / 180 = 2818RPM

I am runnning at 75% currently so it will be 0.75 * 2818 = ~2110rpm ..... seems a little high.....maybe will do it abt 71% to achieve 2000rpm...

Cheers


Mike

[Super-Hornet]

Hi Mike

Actual Li-Ion and Li-Poly, the single cell voltage at full charge is 4.2V. Therefore, 3Cells should be 12.6V.

Super-Hornet

[BonJour Brat]

hey any one know the kV of the stock mabuchi 6V 3W motor?

[HZM]

Wat I toking......must be too sleepy....... 12.6V is the voltage when fully charge


Hee hee

Mike

[Super-Hornet]

Hi BonJour Brat

The mabuchi website i think is down right now.

This is what I have previously.

RK-370SD-2870 -> Voltage Operating Range = 4.5 ~9.6V
No Load -> Speed = 16500rpm, 0.34A
Max Efficiency -> Speed 13790rpm, 1.73A, 5.97mN-m or 60.9g-cm, 8.61W

Super-Hornet

[D.Yeo]

hornet : the 6v motor's have a lower wind and higher kv than the one on the mabuchi website, checked that out

the one on the website is the $6.80 i wanted to order from kaichin.

hey jon you could run 3s on your esc with no problem?