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Other › HBK2 general discussion thread
08-12-2007 06:13 AM  10 years agoPost 41
druski2007

rrNovice

Alvarado Tx.

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where did you get the cf boom i could not find one for it nowhere

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08-12-2007 02:37 PM  10 years agoPost 42
Gyronut

rrProfessor

Martinsville In.

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Hey Brewski.

Send this guy a PM he has them.

CX24ever

Regards

Rick

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08-12-2007 03:24 PM  10 years agoPost 43
rccarguy

rrVeteran

Boston MA

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where did you get the cf boom i could not find one for it nowhere
You can get them here...

http://www.rcmods.co.uk/ek1-0563a-c...om-i603310.html

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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08-12-2007 04:38 PM  10 years agoPost 44
Dubs

rrApprentice

Jackson NJ

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Flying the HBK2

Took mine out in the big open sky for the first time yesterday. Nice cool day but a somewhat stiff breeze going on. Not enough to stop me from flying but it was there. So I take it up with my first pack to get a feel of it other than in my back yard. Real nice huge figure 8's going on. I was getting some warp speeds down wind and it was powering through the up wind direction no problem. I was impressed with the Hdx300 3800kv with a 9 tooth. I had the wife tach my head speed at 3180, so she says. Flew 8 mins let it cool down a bit then got out my next pack and amped myself up for some loops. It is funny that I would do loops, rolls, death spirals, huge stall turns, and fly circuits all the time with my Hirobo GPH346 nitro 10 years ago, but with these smaller helis It takes me longer to decide to start doing stunts. It seems like circuts are harder for some reason and I think it's just the small size. So I pull up some nice stall turns and what a huge difference compared to the stall turns I would get with the Blade. I don't even think the blade can do a stall turn that even looks like it hangs for a second or so before you whip the tail around. Man, I just want to get on the Blade forum and tell people to give it up already once you learn to fly it get rid of it. It's like training gear on a heli, Once you can hover get rid of it. Ok, so here comes the first loop, I set up going into the wind and it goes up and over real nice. It's been a long time since I did a loop . like I said I flew years ago and got back into this about a year ago with a Blade. Did a few more loops and the last one got crazy. If you are not locked in and entering the loop it comes out the other end at bad angles, but I was able to get it corrected. After that I decided to save the last pack for later on before dark when the wind died down a bit. It's a sweet heli and it flys great. I used my $20.00 GWS RX, not even a hint of a glitch. I'll hold off on a 2.4gHz for a while.

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08-12-2007 05:11 PM  10 years agoPost 45
tryan02

rrProfessor

Canton, Missouri

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like to get a better read on that headspeed the pinion calculators only show 2450rpm with 3800rpm/v 9t 11.1v 98% efficiency. I checked it out before I bought that motor. Anyway sounds like you are pretty impressed with the FFF capabilities huh.

No Really I am the club President!!!

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08-12-2007 05:23 PM  10 years agoPost 46
Dubs

rrApprentice

Jackson NJ

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Yes, I do have to get a good read on the head speed. 3180 does seem like a lot!!!! My wife does not take time working the tach, she just gets pissed off.

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08-12-2007 05:42 PM  10 years agoPost 47
tryan02

rrProfessor

Canton, Missouri

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I feel for you why would a man marry a woman who isn't interested in checking headspeed on his heli. Women are only good for 2 things and I'm learning to cook quite well. PS dont tell my wife that or I'll never get to order any more heli parts.

No Really I am the club President!!!

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08-12-2007 05:53 PM  10 years agoPost 48
Dubs

rrApprentice

Jackson NJ

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Too funny

I'm not going to blame her yet on the head speed reading. I think my 9volt was almost dead. Now that I turn the tach back on it just makes a noise and doesn't spin. Hmmmm, think 9volt has to be up to par to get good tach reading, she is lucky this time.

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08-12-2007 06:28 PM  10 years agoPost 49
tryan02

rrProfessor

Canton, Missouri

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little advice dont tell her it was the 9v youll never hear the end of it tell her to do it again she must of done something wrong the first time.

No Really I am the club President!!!

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08-13-2007 01:49 AM  10 years agoPost 50
rccarguy

rrVeteran

Boston MA

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I was impressed with the Hdx300 3800kv with a 9 tooth. I had the wife tach my head speed at 3180, so she says.
YIKES! I hope not, I'm using the same motor with a 10 tooth, that would mean my HBK 2 is going to self destruct any moment now from too much headspeed

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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08-13-2007 02:08 AM  10 years agoPost 51
Dubs

rrApprentice

Jackson NJ

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Head speed

I tached my headspeed again and it was about 2300. I put in a brand new 9v and numbers where adding up better. I benched the bird and set up the head speed over the throttle curve. Made 0 pitch rpm the same as full pitch/full throttle rpm. My HDX300 motor must be running at 85% efficiency to get that 2300 RPM reading ? Set up 100 89.5 100 on the throttle curv in idle up mode. +10 0 -10. I may need a stronger motor because i will bog a bit at +10/full 100% throttle. I then added a bit throttle mix to the rudder, elevator and aileron. It flys way different now, much smoother. These are just figures to figure out what pinion you will need to put you at your ballpark head speed.

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08-13-2007 02:18 AM  10 years agoPost 52
tryan02

rrProfessor

Canton, Missouri

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Feel free to pass this on to your friends. It is a free-ware. Just remember to visit http://www.helitown.com for free RC helicopter information.
Version 1.1

HeadSpeed Calculator
Enter The Number of the Teeth of Your Heli Main Gear: 150
Enter the Pinoin Teeth: 9
Enter Your Motor KV: 3800
Enter Your Battery Voltage: 11.1
Enter the Efficiency Rate (. 8 for 80% or .9 for 90%): 0.91
Estimate Head Speed is: 2303

Click here for explanation of each element of the formular on http://www.helitown.com

looks like motor is running better than you think I'm kinda impressed.

No Really I am the club President!!!

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08-13-2007 02:26 AM  10 years agoPost 53
Dubs

rrApprentice

Jackson NJ

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That is great info. I never counted the teeth on my main gear but the box said 140. hmmmmm (Motor Kv x Voltage x Percent Motor Efficiency x Pinion Gear Teeth) divided by the Main Gear Teeth=Target Head Speed.

(Target Head Speed x Main Gear Teeth) / (Motor Kv x Voltage x Percent Motor Efficiency) = Pinion Gear Teeth.

That is good stuff for building helis. I had some sick head speeds before I had those formulas down.

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08-13-2007 11:44 AM  10 years agoPost 54
tryan02

rrProfessor

Canton, Missouri

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sorry my bad 140 doesnt change a whole lot but efficiency did drop,

Feel free to pass this on to your friends. It is a free-ware. Just remember to visit http://www.helitown.com for free RC helicopter information.
Version 1.1

HeadSpeed Calculator
Enter The Number of the Teeth of Your Heli Main Gear: 140
Enter the Pinoin Teeth: 9
Enter Your Motor KV: 3800
Enter Your Battery Voltage: 11.1
Enter the Efficiency Rate (. 8 for 80% or .9 for 90%): 0.85
Estimate Head Speed is: 2305

Click here for explanation of each element of the formular on http://www.helitown.com

No Really I am the club President!!!

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08-13-2007 03:18 PM  10 years agoPost 55
Dubs

rrApprentice

Jackson NJ

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Ok, so with this subject in mind I was wondering what would be the best change for me to get a better punch out. I bog down the motor a bit with my set up now. 3800kv, 9 tooth, 2300 rpm, +10 on pitch. If I go to a 10 tooth I will have more rpm and would need less pitch to do the same thing. I think I will be around 2500rpm with a 10 tooth. Or would it be better to go to a motor with more kv's ? How is the 10 tooth working for you, rccarguy ?

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08-16-2007 12:38 AM  10 years agoPost 56
rccarguy

rrVeteran

Boston MA

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How is the 10 tooth working for you, rccarguy ?
I think it's the perfect setup for the HDX 300 motor in the HBK2. I usually go 7 1/2 to 8 minutes flight time after which the battery pack is reading 115 to 120 degrees and the motor reads pretty much the same, so it doesn't appear to be putting too much of a load on anything.

I think if I was doing aggressive 3D flying I might find the combination lacking somehow, but for my purposes it seems to be the right setup. I'm running the same motor in a CP Pro with a Freestyle belt tail conversion, only with a 9 tooth pinion and that seems to be the perfect combination for the lighter heli. I'm getting 10 plus minutes flying the CP the same way I fly the HBK2, and I'm absolutely certain I couldn't even come close to the same flight time if I dropped to a 9 tooth on the King2, too much additional weight and a completely different setup on the rest of the electronics. Punchout on the CP Pro is crazy, on the King 2 it's OK, but you really can't compare the two as equals.

I don't believe that dropping the pinion down a tooth would be of any benefit with the current setup, a different motor or flying style might gain from making a change...

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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08-16-2007 05:46 PM  10 years agoPost 57
Dubs

rrApprentice

Jackson NJ

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10 tooth

Rccarguy, you are useing a 10 tooth pinion and an HDX300 3800kv in your HBK2 and are happy with the set up ?

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08-16-2007 11:38 PM  10 years agoPost 58
rccarguy

rrVeteran

Boston MA

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Rccarguy, you are useing a 10 tooth pinion and an HDX300 3800kv in your HBK2 and are happy with the set up ?
Yes, haven't had any issues with this setup. I use it mostly for backyard flying, the Trex comes out when I go to the big field, so I can't say how this setup might perform if you were to really push it in hard 3D flight. I've had it at the field once when I was trimming it out and the performance seemed to be great for the limited flying I did with it that day.

Flight time is significantly shorter than my Trex or Cp Pro, but I think some of that is due to the cheap MegaPower packs. Something of a bit higher quality would probably last a bit longer in flight, but this is strictly a low budget setup for backyard bashing.

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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08-16-2007 11:45 PM  10 years agoPost 59
tryan02

rrProfessor

Canton, Missouri

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just got mine going having trouble with tail setup almost there. trimming out in my dining room man that power scared me but it is short lived just like you said rccarguy well I gotta go fix the blinds from all the propwash damage.

HBK2 stock head and frame
3 e-flite S-75 on cyclic
1 e-flite S-75 w/GY240 on tail
HDX300 Brushless 3800KV - Blade CP/HDX300 9T 2.3mm Pinion
ELE 30A Brushless Speed Controller ESC
Futaba T6EX /R606FS receiver
megapower 1350 11.1 15c lipo

No Really I am the club President!!!

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08-20-2007 03:28 PM  10 years agoPost 60
Dubs

rrApprentice

Jackson NJ

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HBK2

Flew Sunday morning and I just wanted to say this heli is sweeeeet !!! Nothing like another weekend of trouble free flight. No wind at all and the FFF was real nice. Doing loops where so much better this time without a breeze. I did a few stationary back flips and they where no problem at all. It seems like this heli sits up tall from the swash plate up. It makes a flip and a loop seem slightly different than what I was use to. The rotor head is up slightly higher for how long the heli is. I'm switching over to a metal swash plate soon. The plastic swash is great but I rather have the metal balls on the links to the servos. Did a few piros also and no problem at all. Just hold full rudder left or right and let it rip.

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