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Old Jun 28, 2011, 07:48 AM
ancora imparo
jj604's Avatar
Melbourne, Australia
Joined Jul 2005
6,771 Posts
You are correct of course. Damn, I hate it when I am right. From the 35mm thread, "Sorry to nit pick, but it's not entirely certain the Rx supplied with the RTF sets is "the new Orange Rx with the micro plugs".

Looks like there is at least two new low cost "1g" Rx floating around now.
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Originally Posted by MegaTesla View Post
I don't think this is the same system as used in the 35mm Jets.
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Old Jun 28, 2011, 05:34 PM
Stuck on a rock
epilot's Avatar
Germany, NDS, WOB
Joined Nov 2000
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The single servo is indeed around 1.1grams without wires. The double servo is app. 2.2grams without wires so no real weight saving over the single servo other than the wires. I'm not really sure about the merits of having a double servo. It cost more than two single servos and if you break one of the servos on the board it's just dead weight. Apart from perhaps making mounting a bit easier it does not make sense to me. But then, I have always preferred seperate components. My receiver is an early type with a RX module and a driver board soldered together. Consequently it is a bit heavier than the one offered by HK. Servos look to be a bit faster than Spektrum servos. I may be able to shoot a bit of video this weekend.
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Old Jun 28, 2011, 05:52 PM
OpenGL C/C++ programer
axelen's Avatar
Israel
Joined Dec 2006
771 Posts
Hey Epilot

Since the torque seems to be half of that of the spektrums,
do you think the motor can be replaced with a longer can one?
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Old Jun 28, 2011, 05:53 PM
R.C. Aviation Fanatic
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Canada
Joined Aug 2009
21,159 Posts
If these boards were DSM I'd be all over them
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Old Jun 28, 2011, 06:04 PM
Stuck on a rock
epilot's Avatar
Germany, NDS, WOB
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Quote:
Originally Posted by axelen View Post
Hey Epilot

Since the torque seems to be half of that of the spektrums,
do you think the motor can be replaced with a longer can one?
Don't see why not provided the half bridge is up to it. What do you need all that torque for?
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Old Jun 28, 2011, 06:09 PM
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I R Irv's Avatar
United States, IL, Washington
Joined Nov 2008
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Quote:
Originally Posted by axelen View Post
Hey Epilot

Since the torque seems to be half of that of the spektrums,
do you think the motor can be replaced with a longer can one?
Half the torque but probably twice as fast, it's probably just a different gear ratio. A lower OHM motor (assuming there is one)with the same size shaft should work and you might not even notice much of a flight time difference.
TODD
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Old Jun 28, 2011, 06:34 PM
OpenGL C/C++ programer
axelen's Avatar
Israel
Joined Dec 2006
771 Posts
Quote:
Originally Posted by epilot View Post
Don't see why not provided the half bridge is up to it. What do you need all that torque for?
I have been using the spekturm ones on a DIY flybar CP.
The spektrum servos did a great job.

now i am building a FBL (flybarless) CP, based on the new
walkera system for the V100D03 (meaing the RX).

on a FBL system you will need more torque form the servos since
you are direcly affecting the pitch of the blades,
rather than just affecting the pitch of the paddles (on a hiller rotor head)
or mixing some affect on the blades and some on the paddeles (bell-hiller head).


so to summarise, I am a bit worried about torque for a FBL CP heli...
I know they will work. the heli will fly. but if they lack toque, the cyclic (manourvering (spelling?)) will be slower
than is supposed to be. this might also confuse the RX's FBL programing...

I am just anticipating problems... always expect the worst and then you wont get dissapointed...

I based my last air frame design for my CP (VP tail) on 4 HK micro rotary servros (stated 2.2gr actual 2.45gr).
Vp tail meant a lot of new parts.
eventually, these servos were such crap, i had to replace the tail with a WK tail servo, and add a voltage booster to ensure
5v for the cyclic servos (they freaked out when batt' was 70% drained and me giving some pitch to ask for good AMP's be the motor... )
the servo's gear break if you turn the horn by accident while screwing in the horn lock screw..... ext ..
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Old Jun 28, 2011, 06:37 PM
Stuck on a rock
epilot's Avatar
Germany, NDS, WOB
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I have no idea what you just said but I'm sure it will make sense to someone
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Old Jun 28, 2011, 06:49 PM
OpenGL C/C++ programer
axelen's Avatar
Israel
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Quote:
Originally Posted by I R Irv View Post
Half the torque but probably twice as fast, it's probably just a different gear ratio. A lower OHM motor (assuming there is one)with the same size shaft should work and you might not even notice much of a flight time difference.
TODD
.12ms compared to .14
not half, but faster
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Old Jun 28, 2011, 06:57 PM
OpenGL C/C++ programer
axelen's Avatar
Israel
Joined Dec 2006
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Quote:
Originally Posted by epilot View Post
I have no idea what you just said but I'm sure it will make sense to someone
I used to shop @ your store... was sure you were
familiar also with heli talk


generally speaking... a heli changes direction (and self sabilises) by
changing the pitch of the blades as they turn around.
this means, if you want to fly forward, when the bladews rotate around
the front of the heli their pitch will provide less lift. While when they
pass through the rear part of the heli they will provide more lift.

this is how a heli tilts. self sabilising systems can be divided into two
majour methods :
1) electronics stabilise the heli
2) mechanics = flybar used to self stabilise the heli.

method 1 requieres more torque from the servo's since they direcly affect
the blade's pitch, rather than method 2 which only changes the pitch of the paddles.
This is because a paddles surface area (and mass) is much less than a blade.
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Last edited by axelen; Jun 28, 2011 at 07:04 PM.
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Old Jun 28, 2011, 06:59 PM
Team30 Micro EDF
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Stellenbosch, South Africa
Joined Apr 2004
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axelen, have you considered lightening these? They are the only normal servo style that uses a 4mm coreless motor. (AFAIK)

HK 2.2g servo $3.99

Spec.
Torque: 0.2kg
Weight: 2.2g (.08oz)
Speed: 0.08 / 60deg
Voltage: 3v~4.8v
Motor type: Coreless

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Old Jun 28, 2011, 07:00 PM
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I R Irv's Avatar
United States, IL, Washington
Joined Nov 2008
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Quote:
Originally Posted by epilot View Post
I have no idea what you just said but I'm sure it will make sense to someone
It was clear as MUD to me also.
TODD
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Old Jun 28, 2011, 07:08 PM
Stuck on a rock
epilot's Avatar
Germany, NDS, WOB
Joined Nov 2000
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Quote:
Originally Posted by axelen View Post
I used to shop @ your store... was sure you were
familiar also with heli talk
Never did much with helis, just know the basics (I'm too uncoordinated to fly one).

BTW, I have an Israeli employer now - we should be having this discussion in Hebrew! I can already say yes and no
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Old Jun 28, 2011, 07:16 PM
OpenGL C/C++ programer
axelen's Avatar
Israel
Joined Dec 2006
771 Posts
Quote:
Originally Posted by MegaTesla View Post
axelen, have you considered lightening these? They are the only normal servo style that uses a 4mm coreless motor. (AFAIK)

HK 2.2g servo $3.99

Spec.
Torque: 0.2kg
Weight: 2.2g (.08oz)
Speed: 0.08 / 60deg
Voltage: 3v~4.8v
Motor type: Coreless



these are the ones ...

"I based my last air frame design for my CP (VP tail) on 4 HK micro rotary servros (stated 2.2gr actual 2.45gr).
Vp tail meant a lot of new parts.
eventually, these servos were such crap, i had to replace the tail with a WK tail servo, and add a voltage booster to ensure
5v for the cyclic servos (they freaked out when batt' was 70% drained and me giving some pitch to ask for good AMP's be the motor... )
the servo's gear break if you turn the horn by accident while screwing in the horn lock screw..... ext .. "
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Old Jun 28, 2011, 07:17 PM
OpenGL C/C++ programer
axelen's Avatar
Israel
Joined Dec 2006
771 Posts
Quote:
Originally Posted by epilot View Post
Never did much with helis, just know the basics (I'm too uncoordinated to fly one).

BTW, I have an Israeli employer now - we should be having this discussion in Hebrew! I can already say yes and no
shalom shalom
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