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mixing servos help - 11/28/2007 8:45:47 PM   
rccrasher9


 

Posts: 69
Joined: 10/17/2004
From: , TX, USA
Status: offline 		Hi, I have trex se v2 and LHS is limited on supply.... ds3400g for the tail, 1 hs-65 mg for pitch, 2 jr 285's for swash,

questions

1. how would you use the options above?

2. not much into 3d, just hovering around..... maybe later just flips or rolls....

3. these would be my setup, Id have to wait 7 days to get all hs65-mg..... should I wait or will this work?

1- hs-65 mg has .14 sec 4.8v with 24.99oz of torque

2- jr ds285 has .18 sec 4.8v with 18oz of torque

is the diff really noticable beween both?

4. I am using a 240 gyro with g3400 jr servo and a jr8103 tx ..... I've read this setup will and wont work. Is anyone using this setup?

thanks,

joe
       Post #: 1

RE: mixing servos help - 11/28/2007 8:59:30 PM   
hennesseylord


 

Posts: 485
Joined: 9/27/2007
From: Mulberry, FL, USA
Status: offline 		i would wait and get all the servos the same for the cyclic controls...having different servos will make the swash not move all together. your heli is ccpm so all the servos work together to make the swash move left/right/forward/backward/up/down.


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RE: mixing servos help - 11/28/2007 9:10:47 PM   
USHobbySupply


 

Posts: 1499
Joined: 7/12/2006
From: Takoma Park, MD, USA
Status: offline 		Agreed. Its best to have all three cyclic servos the same. They really should have the same response time, or your cyclic response will be off.

I dont see why the GY240 and tail servo would not work, but am open to others opinions.

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RE: mixing servos help - 11/28/2007 9:12:22 PM   
BarracudaHockey



Posts: 11055
Joined: 7/13/2003
From: Orange Park, FL, USA
Status: offline 		With a ccpm setup you want 3 identical servos.

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RE: mixing servos help - 11/28/2007 11:47:54 PM   
brcottam


 

Posts: 3
Joined: 11/28/2007
From: Vernal , UT, USA
Status: offline 		Hello, I was wondering if someone could help me with a 450 Class Hello (Electric). I am new to heli's but not RC. My helio is a 6Ch ROBO 450 CCPM 3D RC EP almost the same as the t-rex. I’m having problems with the controls. The blade pitch is reversed, I cant figure out how to track my blades, one turns a 1/4 in higher than the other, and today while trying to work through the problem I disabled the motor somehow? I'm stuck and getting frustrated, any ideas?

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RE: mixing servos help - 11/28/2007 11:59:49 PM   
RussWisc



Posts: 389
Joined: 8/6/2007
From: Minocqua, WI, USA
Status: offline 		I was told too .... not just the same 3 servos on the Cyclic ,,,but 3 from the same batch so they run the same ... not 1 new 2 used ... ECT

all of the servos you have listed look good ,,, personaly I like Digitals ds285 ... the ds3400g/GY401 is what i have its a great servo

< Message edited by RussWisc -- 11/29/2007 12:05:51 AM >

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RE: mixing servos help - 11/29/2007 1:38:22 AM   
rccrasher9


 

Posts: 69
Joined: 10/17/2004
From: , TX, USA
Status: offline 		???? confused.... I was told on the pitch you can have a hs-65 mg and on rock n roll you can have ds285's. as the pitch is controlling the angle of blades and the rock n roll are moved together. these are digital...... Why do you need pitch to move the same as rock n roll?


Please guys, help me sort this out as my LHS recommended this as they did not have all three hs-65mg in stock....


I will take them back 2-ds285's and wait for the hs-65 mg.

***they have 3 hs-56..... do you think these will work?

Thanks,

Joe

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RE: mixing servos help - 11/29/2007 2:04:55 AM   
RBCCONT


 

Posts: 118
Joined: 10/29/2005
From: CORAL SPRINGS, FL, USA
Status: offline 		I think you would be better off with the 3 56s.when you increses or decrese pitch all 3 servos move at the same time,I am prety sure they are a little quicker than the 65s just not as much torque.but if you are not doing 3d there wont be alot of stress on them.

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RE: mixing servos help - 11/29/2007 2:26:06 AM   
tippy


 

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From: Town Creek, AL, USA
Status: offline
quote:

ORIGINAL: rccrasher9

???? confused.... Why do you need pitch to move the same as rock n roll?



Read the previous posts ... if your heli is CCPM then ALL THREE OF your servos perform the Pitch FUNCTION ... not just the one plugged into the Pitch CHANNEL.
Don't confuse the Pitch CHANNEL/SERVO with the Pitch FUNCTION (what makes the blade pitch change).

For a 120° swash config (eCCPM) ... ALL THREE swash servo/channels (Pitch, Aileron, & Elevator) perform the Pitch Function and ALL THREE swash servo/channels perform the Elevator function.
This is why you need all your servos to perform the same.

If you had a non-CCPM heli (ala TT Raptor), then the Pitch channel/servo can be different because only the Pitch channel/servo performs the Pitch Function.

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RE: mixing servos help - 11/29/2007 4:06:40 AM   
RussWisc



Posts: 389
Joined: 8/6/2007
From: Minocqua, WI, USA
Status: offline 		the pitch servos as you call it are 3 of the same brand and model the 3 going to the swatchplate have to be the same, you can have a Gryo servo like the DS3400g with your GY240Gyro .. save the 2 ds285s and get 1 more ... or get 3 HiTecs both 65MGs or 56HB will do fine

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RE: mixing servos help - 11/29/2007 4:12:03 AM   
hennesseylord


 

Posts: 485
Joined: 9/27/2007
From: Mulberry, FL, USA
Status: offline 		i like the hs-65mgs, thats what i use on my trex and they are amazing, i cant do hard 3d but i can jump the heli around and the servos respond and center very nicely.


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RE: mixing servos help - 11/29/2007 6:26:30 AM   
rccrasher9


 

Posts: 69
Joined: 10/17/2004
From: , TX, USA
Status: offline 		I already have the gyro 240, and 3 hs-55. and can get a 50.00 anolog servo for tail tl $50.00.... is $225.00 for a 401 and a ds 3400g worth the diff in quality for normal flying and a few flips and rolls, or will I see a big diff as to where I wont regret spending 225.00?


I already bought a 401 and ds3400g with 2-ds285's and 1 hs-85mg TL $336.39.... but I can still return, have not opened package yet

I understand the hs-56 will work fine, but will the hs-55 work fine as will compared to hs 56?
Thanks,

Joe

< Message edited by rccrasher9 -- 11/29/2007 6:31:27 AM >

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RE: mixing servos help - 11/29/2007 10:41:03 AM   
VinceHerman



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Joined: 9/5/2002
From: Wadsworth, OH, USA
Status: offline
quote:

I understand the hs-56 will work fine, but will the hs-55 work fine as will compared to hs 56?
Nope. The HS55 is not up to the job. The centering is too poor on the HS55, and the cyclic control is one place where slop is not acceptable.
See if you can exchange the 3 cyclic servos they sold you for 3 matched ones. HS56 will work well. HS65 will work well.
Vince

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RE: mixing servos help - 11/29/2007 12:11:42 PM   
rccrasher9


 

Posts: 69
Joined: 10/17/2004
From: , TX, USA
Status: offline 		Thanks to everyone for pitching in your knowledge....


Thanks,

Joe

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RE: mixing servos help - 11/29/2007 2:43:48 PM   
RussWisc



Posts: 389
Joined: 8/6/2007
From: Minocqua, WI, USA
Status: offline 		do not get a great machine and discount the electronics ... a heli flys great only with good electronics even for just hover ,,, do the good electronics ,, you can always reuse them on a diferent machine in the future

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RE: mixing servos help - 11/29/2007 7:14:36 PM   
Tolla


 

Posts: 303
Joined: 9/13/2006
From: Cape Town, SOUTH AFRICA
Status: offline 		get hs65's / 401 / 2100T/ 9650. Buy cheap, buy twice. Been there. take the advice given here...get decent electronics first time round.

(in reply to RussWisc)