RunRyder RC
 6  Topic Subscribe
WATCH
 1 page 2068 views POST REPLY
ProModeler Scorpion Power
03-08-2006 02:34 PM  11 years agoPost 1
Heli_J

Senior Heliman

Kannapolis, NC - USA

My Posts: All  Forum  Topic

havent seen this yet, what headspeed are we running...I have the hacker 30-10L, (2) 2100 EVO20's, 17t pinion...

90% calculated is 1677 and i "heard" that the QJ8 didnt need the 2400+ insane headspeed...

am i right or wrong that this heli uses lower heaqdspeed?

what about you cat's that do 3D junk, recon yalls is higher?

---> Blade CP, T-Rex, MX-400, QJ-8, QJ-16 No Gass, only Electric!

PM  EMAIL  GALLERY  Attn:RR
03-08-2006 04:21 PM  11 years agoPost 2
TYREE

Veteran

Sonoma county

My Posts: All  Forum  Topic

Hey Heli-J,

I don't know about the low end but have seen more advanced folks running the head speeds up to 2200 or so. I think I've seen where the top end with the new models of the QJ-8 should'nt go over 2400.

Tyree

PM  EMAIL  Attn:RR
03-08-2006 04:32 PM  11 years agoPost 3
AnnihilaT

Key Veteran

The Netherlands

My Posts: All  Forum  Topic

I run 2450 RPM on mine with the 25T slowdown counter gear for the tail. This is no problem. I fly 3D.





A day without sunshine is like, well, night.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
03-08-2006 05:16 PM  11 years agoPost 4
flytech

Veteran

Sunland, CA

My Posts: All  Forum  Topic

the reason why is because we have witnessed main shaft failure at 2500-2600rpm. the previous distributor ran this experiment while searching for motors and found that the main shaft is too soft to support extreme speeds.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
03-08-2006 05:20 PM  11 years agoPost 5
zero_IQ

Senior Heliman

greece

My Posts: All  Forum  Topic

I run 2200RPM head speed.
I have modified my QJ-8 with rotorworkz carbon frame and bigger landing gear. It is very agile when you command it and very stable at hover. I can hover my QJ-8 at 12-15m/s gusty winds, you don't need more head speed than that if you are not into heavy 3D.
Together with my QJ-8 kit I purchased a range of pinions from 15T to 21T and tried different head speed settings from 1700RPM up to 2600RPM and found that it flies very well in low head speed if there is not a lot of wind. It is very stable from 2000RPM hs and up. At 2600RPM it is a rocket.
I run the hyperion Z3019-10 1070KV motor and polyquest XP 4s 3300mAh packs.
All up weight with the modification of the landing gear, the canopy and full size tail servo is 1550gr.
Flight time is 14 minutes of sport flying. I get 16 minutes of flight time if I reduce the hs to 1700RPM, which is not a big difference, so I decided to run 2200RPM that makes this heli a joy to fly.

zero_IQ

PM  EMAIL  GALLERY  Attn:RR
03-08-2006 05:27 PM  11 years agoPost 6
txkawboi

Senior Heliman

Katy, TX USA

My Posts: All  Forum  Topic

Hover

Will this heli hover at 1700 HS? If so, I'd like to run mine that way once it's airborn for learning purposes.

Ken

It's better to have flown and crashed than to never to have flown at all.

PM  EMAIL  Attn:RR
03-08-2006 06:08 PM  11 years agoPost 7
Heli_J

Senior Heliman

Kannapolis, NC - USA

My Posts: All  Forum  Topic

mine hovers at the lowers speed...and when i "goose it up" it goes up...but wait till you hear them blades spin...they SOUND REAL!

I see the point of higher head speed in wind...makes good sense to me cause the higher speed "cuts" better"...well thats the way i think...

once i get flying, ill go up in speed ...see who else chimes in though and thanks all so far!


PS: zeroiq, your posts/answers help me more than you could imagin...keep it up!

---> Blade CP, T-Rex, MX-400, QJ-8, QJ-16 No Gass, only Electric!

PM  EMAIL  GALLERY  Attn:RR
03-08-2006 06:56 PM  11 years agoPost 8
AnnihilaT

Key Veteran

The Netherlands

My Posts: All  Forum  Topic

To clarify: I tach 2450 on the ground and once in the air it drops to about 2300 or so.





A day without sunshine is like, well, night.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
03-08-2006 09:24 PM  11 years agoPost 9
Gyro Gearloose

Heliman

Naranjito, PR.

My Posts: All  Forum  Topic

I had to register just to get my 2 centavo worth in here.
I am by no means an expert, but I do have some opinions based on a bit of experience.
Unless one is into hard-core "3-D" (or just wants to pretend they are)all this excessive head speed is a waste of amps to make noise! This machine flys very well at 1700-1750 rrpm. It is much more docile at those speeds and unbeliveably stable! Probably too stable for more experienced fliers. For my style, 1800-1850 seems to be the "sweet spot". Flying 4S-4000mah lipos and a 17 tooth pinion, I have two entirely different set ups of throttle and pitch curves on idle up #1 and #2. #1 is my "sweet-spot" set up, and #2 is the "hot" set up, about 2100rrpm, just to try different things. This enables me to switch back and forth to compare the differences. It's interesting, it will really jump and scoot around much more responsively, but for relaxed scale type flying I really enjoy the milder setup and reccomend it for the "non-pros".
BTW; I fly like an old f@rt basicly because I AM an old f@rt!

PM  EMAIL  Attn:RR
03-08-2006 09:37 PM  11 years agoPost 10
TYREE

Veteran

Sonoma county

My Posts: All  Forum  Topic

Hey Gyro Gearloose,

Thanks for the head speed info! I am sure it will help some of us who are just now building/flying this heli.

Can't quite decrypt this: I fly like an old f@rt basicly because I AMan old f@rt!...I think you're saying you're OLD!

It's all in the mind!


Tyree

PM  EMAIL  Attn:RR
03-08-2006 09:40 PM  11 years agoPost 11
AnnihilaT

Key Veteran

The Netherlands

My Posts: All  Forum  Topic

It really seems like there arent many people flying 3D with these things. I cant imagine even trying to flip mine at low altitude with only 1850 headspeed. This is a SMALL heli with a 890mm rotorhead. I dont recommend anyone try this if they plan on getting into 3D. This machine falls fast

However i do agree that 1800-1900 will fly this thing very well providing you arent flipping it around and providing it will hold that headspeed with no bogging or very little. Hovering and forward flight will be a joy at this headspeed but if its more than just a stable docile heli you want then you need to pump up that headspeed.





A day without sunshine is like, well, night.

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
03-09-2006 12:10 PM  11 years agoPost 12
Heli_J

Senior Heliman

Kannapolis, NC - USA

My Posts: All  Forum  Topic

gyro gearloos...thanks, i to like flying like an old fart...but im not yet...LOL...yes, the sound of the lower headspeed is neat too...

MFIS, it seams like if one wants slow/scale/beginner training then the 1700/1800 range is goos...for 3D 2200/2400 rpm....

this is GREAT info and will help us all learn and make the qj8 shine....has anyone notices...ZERO / NADA single complaint!

PS: Thanks harld (helicopterhobbies) for setting me up. He listened and asked where i was in the heli game and recomended the slower headspeed...

---> Blade CP, T-Rex, MX-400, QJ-8, QJ-16 No Gass, only Electric!

PM  EMAIL  GALLERY  Attn:RR
07-01-2006 10:48 PM  11 years agoPost 13
Rastaman

Heliman

La Suede

My Posts: All  Forum  Topic

Hi Zero!

I use the same motor as you and the same pack and I can't get this baby to perform anywhere close to my T-REX for example?! And still is the motor windings pretty hot, about 55-65 degees celsius.
It feels really like flying a bus, safe and so but not very agile...
Should I put on a bigger pinion? Should I go up to 5S or even 6S?

Any advice is really appriciated!

/Stefan

"From Zero IQ:
I use polyquest 4s 3300Ah XP packs and 4s 3100Ah SP packs.
I do sport flying and I get 13-14 min flying time with 3300XP or 11-12min with 3100SP though I limit my flights to 10min.
The weight of 3300XP is 336gr, 3100SP is 271gr.
Motor is hyperion Z3019-10 with 16T pinion, headspeed at 2200RPM.
zero_IQ"

PM  EMAIL  Attn:RR
07-02-2006 08:33 AM  11 years agoPost 14
zero_IQ

Senior Heliman

greece

My Posts: All  Forum  Topic

Comparing to T-Rex the EP-8 is much more stable because it is heavier with a higher disk loading. If you are used to run your T-rex at 2800RPM head speed, to have the similar flight performance from EP-8 you need 470mm blades and 2400RPM head speed or higher. Quick Japan is selling a stretch kit to use 470mm blades with the EP-8.
The other thing to try is to save some weight. With my current setup my EP-8 weights 1470Gr with 4s 3100mAh or 1530Gr with 4s 3300mAh, I use 400mm wooden blades at 2200RPM hs for sport flying (fff with some loops & rolls). I can feel the need for higher head speed but I’m afraid to try with the wooden blades. I was running 2400RPM with 385mm SAB cf blades and I had similar vertical performance. At 2600 RPM with the SABs the heli really comes alive and reacts fast but flight times reduced to 6-7 minutes.
Motor temperatures at 55-65C are normal if you are in constant collective demand, I use the QJ alloy fan at the top of the motor and after 10min of sport flying the motor never exceeds 55C.
Some friend is running this motor with 4s and 21T, with this configuration he can do stationary flips, hurricanes, tic-tocs and stuff. I’m not up to that point yet. Also with 21T the ESC drives the motor at partial load, most of the time less than 60%, thus the ESC gets hot and some cooling holes at the canopy are needed to avoid thermal shutdown.

zero_IQ

PM  EMAIL  GALLERY  Attn:RR
07-02-2006 10:25 AM  11 years agoPost 15
Rastaman

Heliman

La Suede

My Posts: All  Forum  Topic

Excellent reply as usual Zero!
I will try a bigger pinion, my avarge ampdraw is just 22A, so I really can go further!

I'll let you know!

/Stefan

PM  EMAIL  Attn:RR
07-05-2006 12:52 PM  11 years agoPost 16
34ford

Senior Heliman

North Carolina

My Posts: All  Forum  Topic

Is anyone using a CC phoenix esc with your Hacker?
I have the A30-10L with the 45HV and I was wondering what throttle to use.

Low governor
High governor
Heli fixed endpoints.

I think I figured out why I cant get over 1800 rpms. I had the 45 setup for auto-calibrating
I installed the castle link last night so its all another learning curve.

_____
Dennis

Yuneec Typhoon Q500 4K

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
07-05-2006 02:05 PM  11 years agoPost 17
Stack

Veteran

Bethlehem, PA

My Posts: All  Forum  Topic

I'd suggest starting with Low Gov mode and taking it from there. If it doesn't perform well in low, switch to high! Just got my swift setup this weekend with the new CC software (1.51B) and it really is working like a charm.

It is important to read up on the CC website on what settings are needed for gov mode. I was never a fan of it until now... I felt like I was giving up a bit of control to the ESC. The spoolup now is nice and smooth (no jumping!).

Anyway.. my Tango motor wasn't happy in fixed endpoints so I was forced to go to gov mode. Glad I did!!!

More Info here:
http://www.castlecreations.com/down..._beta_info.html

PM  EMAIL  Attn:RR
WATCH
 1 page 2068 views POST REPLY
ProModeler Scorpion Power
 Print TOPIC  Make Suggestion 

 6  Topic Subscribe

Friday, August 18 - 4:02 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online