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Old Nov 14, 2014, 12:17 PM
Registered User
South London United Kingdom
Joined Jun 2003
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Quote:
Originally Posted by 2Doggs View Post
Most Turnigy servos have Futaba style splines - I've always drawn from my vast stock of Futaba type arms that came with the various junky 9257 clone tail servos I tried out!
Thanks 2Doggs.
I have tried Futaba arms. they seem to fit the splines ok, but are a very slack fit.
Same with every other one I have tried.
Did find that the spare arms from the Turnigy 1257's I have on my 550 fitted ok, with a piece of plastic bag as a shim.
Not exactly good engineering but it seems to work.
BTW, contacted HK product specialist. He said they do not do spare arms, and then proceeded to link me to HK site where it shows loads of accessory servo arms listed for Turnigy, but none says which servo they fit.
Funny, I expected more from a 'product specialist'.

Ho hum

BL
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Old Nov 20, 2014, 07:30 PM
If it Works, You Better Fix It
VelocityRC's Avatar
North Idaho
Joined Feb 2011
720 Posts
I was waiting to comment on this... I think I can officially say that this is the first season that I have had no crashes / failures since I started flying 4 years ago. Had to wait until flying season was over to say that, not to jinx myself.

I've been flying more that ever too + I got the one 450 with the tail gremlin fixed and got a few flight on it late this season.

Its getting too cold here for my thumbs and I don't want to dumb them out with the temperature. LOL. First snow today here in North Idaho. Time for winter maintenance now and with three 450 Pro's that will keep me busy for a bit.

I'm thinking about building a 450L Dominator if X-Mas funds will permit.

BL, How is that GAART 450L coming along and what do you think of the quality ? I seem to remember that you bought one a few months ago.

Anyway, thanks to all of you for the great reading and suggestions. I'm looking forward to more this winter. I'm going to break out the Walkera CB100 and start flying in the house now

Happy Flying !!!

Bill S.
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Old Nov 21, 2014, 01:49 AM
Registered User
South London United Kingdom
Joined Jun 2003
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Hi Bill

Nice to hear you have had a successful season. Same here, apart from a dirt nap with the 500GT, pilot error.
Moving into winter over here too. With us, not so much cold as lack of light. With the silly clock going back, it gets dark around 4 o'clock.
That's about the time I get home from work. Managing to do a bit on my days off, but not as much as I'd like.
Oh well, spring's only 5 months away
As regards the Garrt, progressing slowly. Started pulling things down for a grease up and an eyeball.
Starting to congratulate Garrt on not using too much threadlock till I came to removing the feathering shaft. Managed to get one bolt undone so I could slide it out, but the other needed the use of a heavy vice and much harsh language.
Why, oh why do they feel the need to use gallons of quick drying concrete as a threadlock.
Still feel there is a need for these manufacturers to offer a kit version of their models, and leave the buyer to do final assembly. Would save on production costs, some of which could be passed on to the buyer. Win-win in my book.
Sermon over.
Other than that, quality still looks to be good, and external appearance is a cut above the rest.
Debating at the moment which FBL unit to use.
I have two models in operation with ZYX-S units very successfully. Two others using Kbars which are giving me a few headaches.
Did buy a ZYX-S2, which came doa, so no good there.
Toying with using s Turnigy 3-DH V2. Heard good reports about it, and programmed from the transmitter so don't need a computer.
Jury still out on that one.

Cheers

Jeff (BL)
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Old Nov 21, 2014, 09:16 AM
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South London United Kingdom
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Velocity RC

Hi Bill

Don't really want to get deep into the 450L until I am clear about how I want to kit it out.
Decided to go the 6s, high h/s route until I came across this vid.

New Align TRex 450L - LOW RPM (3s) 3D Flight by Ben Storick (5 min 26 sec)


Can't really believe that is only 1500 rpm, but if so, that's exactly the way I want mine to fly.
TBH, the zip/zip smackdown style leaves me cold, even if I was capable of it. Much prefer the smooth fast style as shown in the vid.
So, back in the melting pot.
Used to be indecisive, now I'm not so sure, lol.

Jeff
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Old Nov 21, 2014, 09:34 AM
FPV Noob KD0VMK
United States, MO, Platte City
Joined Jun 2012
677 Posts
Quote:
Originally Posted by Border Lord View Post
Velocity RC

Can't really believe that is only 1500 rpm, but if so, that's exactly the way I want mine to fly.
TBH, the zip/zip smackdown style leaves me cold, even if I was capable of it. Much prefer the smooth fast style as shown in the vid.
So, back in the melting pot.
Used to be indecisive, now I'm not so sure, lol.

Jeff
I think it's still very possible to fly smoothly without dropping headspeed so low. It has more to do with the pilot than headspeed, in my opinion.

I'm curious what else was done to the heli to make it fly well at that low head speed. Mine gets all....weird...when the headspeed drops. It almost becomes unstable. Simple hovering becomes a bit of a challenge, because it wanders all over the place, and requires constant stick input to keep it upright. Increasing the headspeed really locks it in place, and it will hover hands free for several seconds before intervention is required.
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Old Nov 21, 2014, 09:39 AM
Gaui X3, RTF Mini Quad
BladeScraper's Avatar
United States, MO, KC
Joined Jun 2011
3,504 Posts
Throw a 3s in your 6s machine...

Gaui X3 Super Low HS with 3s LiPo - 1700KV Turnigy Motor (5 min 51 sec)


or for a bit more HS, do a 4s

Gaui X3 with Turnigy RotorDrive 1700Kv and 4s Low HS (5 min 30 sec)
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Old Nov 21, 2014, 10:29 AM
Registered User
South London United Kingdom
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Quote:
Originally Posted by Chubbs View Post
I think it's still very possible to fly smoothly without dropping headspeed so low. It has more to do with the pilot than headspeed, in my opinion.

I'm curious what else was done to the heli to make it fly well at that low head speed. Mine gets all....weird...when the headspeed drops. It almost becomes unstable. Simple hovering becomes a bit of a challenge, because it wanders all over the place, and requires constant stick input to keep it upright. Increasing the headspeed really locks it in place, and it will hover hands free for several seconds before intervention is required.
Hi Chubbs

Certainly food for thought. Not sure what else has been done to the machine, but figures seem to support the 1500 h/s.
My 450L comes with a 11t pinion and a 121t main. Plug those figures into a h/s calculator with a 1700Kv motor and 3s pack gives 1677 at 100% h/s.
Wonder whether the extended blades make a difference.
Anyway, I have 3s and 4s packs available, so a 1700 motor is the way to go and see what happens.

Blade Scraper
Any idea what the h/s is in those vids. Need pinion and main teeth to calculate it but still looks like low h/s is not a drawback.

Work in progress

BL
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Old Nov 21, 2014, 10:43 AM
FPV Noob KD0VMK
United States, MO, Platte City
Joined Jun 2012
677 Posts
I don't doubt his figures...the audio certainly sounds like those blades are slow. It sounds very different from mine (though I only have a 3s setup to begin with).

I'm sure the longer blades make a difference too. Longer blades=greater gyroscopic effect=greater stability.

I guess I still don't see much advantage, besides being a fun experiment. Perhaps it's more efficient for longer run times? It's mentioned in one of the videos that the flip rate is very slow...could you not accomplish the same thing by simply reducing control throws on your transmitter, or adding a ton of expo? If we're just trying to make the heli less responsive, it can be done a bunch of different ways.
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Old Nov 21, 2014, 10:49 AM
Gaui X3, RTF Mini Quad
BladeScraper's Avatar
United States, MO, KC
Joined Jun 2011
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http://heli.dacsa.net/calcv3/

I don't know for sure, but its about 2200-2300HS with the 4s and 1500~1800 on 3s. I have:

1700Kv Rotor Drive
HobbyWing Platinum Pro 50A V3
4s 1800mAh and 3s 2200mAh
131t main gear
13t pinion


The flip rate is slow because the head speed is too low to get the set flip rate in the FBL (270deg/sec) using the amount of cyclic throw I have. The FBL is using all the cyclic throw that it has available, but it can't go any faster due to the low head speed. It has nothing to do with the radio. I have no dual rates and no expo. I hate expo and dual rates are useless.

When I had a 3s system on it I got very short flights and everything got hot (180F+)
Gaui X3 with Gens Ace 2200mAh 3s (3 min 13 sec)

but the FBL unit was very easily able to reach its set flip rate of 270deg/sec because I had ~3400HS.

Flight times are long as heck. I get 5:30 to 6:00 with 4s (it's not a very big 4s, I should be running 2000-2200 or so) and I get closer to 8 minutes with 3s.

350mm certainly help, and I could go even lower with 360mm. I did low HS with 325's, but it was really not enough to do anything and I wasn't able to go below 2200HS before losing all pop.

I had to run 68mm tail blades (Lynx) otherwise the tail was all over the place.
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Old Nov 21, 2014, 11:26 AM
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South London United Kingdom
Joined Jun 2003
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Hi BS

Thanks for the extra info, but you've lost me a little bit.
When you say the 3s gave you short flights and got very hot, was this with a 3s or a 6s motor?
If it was a 6s motor, how did you get to 3400 h/s? Pinion size?

Cheers

BL
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Old Nov 21, 2014, 11:33 AM
Gaui X3, RTF Mini Quad
BladeScraper's Avatar
United States, MO, KC
Joined Jun 2011
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my bad, it was a 3s motor when it got hot.

I got about 2:30-3:00 of hard 3D, and got 180F+ temps on motor and ESC.


I am now running the KDE 450XF 1750Kv just waiting on some 6s batts.
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Old Nov 21, 2014, 11:36 AM
Team Mulikow 3D
Oxfordshire, UK
Joined Jan 2007
4,133 Posts
Jeff,

As others have said, you can still fly smooth and gentle with higher HS. I had my stretched (360mm bladed) 450 Pro set up to run at about 2,200 and 2,400 previously and it really didn't fly that nicely - the tail struggles to hold on anything more than a veryyyy gentle collective input (even with bigger tail blades), and even though I geared it down it was much more "boggy".

Worst of all though - if you mess up a move (even a gentle one) you don't have the power to get out of it, so the earth gets much closer

with the 360mm blades and 3,000rpm it is a rocket-ship, 2,800 is a nice compromise.

Cheers,
Mike
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Old Nov 21, 2014, 12:04 PM
Gaui X3, RTF Mini Quad
BladeScraper's Avatar
United States, MO, KC
Joined Jun 2011
3,504 Posts
The Gaui X3 is a little different, the tail is rock solid at the RPM I was flying. I think the tail ratio is higher than the 450 Dominator.
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