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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Throttle SERVO for Spectra-G
01-19-2009 03:18 AM  9 years agoPost 1
iskoos

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Orlando, FL

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I need a throttle servo. Looking for something not expensive but will do the job. What would be the cheapest qualified servo that I can use?

And FUTABA servo please.

Many Thanks

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01-19-2009 03:29 AM  9 years agoPost 2
jschenck

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La Vista, NE.

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3010 or 3151 (3152 is better if you are buying new) - I use a 3010 on my Predator. Probably a bit of an overkill but I'm going for reliability here. I don't think a metal geared servo would be a good idea on any throttle since the engine vibs can be bad there.

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01-19-2009 03:37 AM  9 years agoPost 3
CNCjunkie

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Kauai (The Garden Isle), Hawaii - USA

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I've been running an S9252 in my Pred Gsr for a while now with good results and will install the same in the Spec-G I'm currently building.

Just another crappy day in Paradise....Aloha!

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01-19-2009 03:38 AM  9 years agoPost 4
Toadster25

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Iowa

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I am using a futaba 3003 standard non bearing servo. Seems to work great for me. I am using the GV1 with it. I did replace the first one after over a year but it was still working fine. The output shaft seems to be getting loose but it didn't quit working. Only cost $10 for one so it is cheap. I did try a 3001, but it didn't seem to work well with the GV1. It wouldn't keep the engine rpm steady so I just went back to the 3003.

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01-19-2009 03:45 AM  9 years agoPost 5
GREYEAGLE

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Flat Land's

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I'm running a chepo
Think their Old 3004's and I use a fiberglass push rod for a bit of dampening. I'd hate to ruin a good one.

greyeagle

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01-19-2009 04:34 AM  9 years agoPost 6
iskoos

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Orlando, FL

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Thanks for the replies...

Although I know they will work, I will try and use something different than a standard series servos like 3001, 3003, 3004.

Never heard of s3010 before but certainly could be an option. New affordable digitals s3151 and s3152 looks very good too though I am not sure if it needs to be digital.
I am running GV-1 with stator gator but I am sure digital will make no difference.

S9252!!! sure if would be sweet. I just don't have $85 to throw on a throttle servo at this moment...

I currently have s9202 on the throttle but I am having some issues. It gets stuck while the engine running and it scared me alot today. So although it seems running perfectly on the table, it has some serous issues. So it has to be replaced but not with another s9202. they are over $50 and I don't want to spend more than 30 bucks for it...

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01-19-2009 01:04 PM  9 years agoPost 7
copperclad

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NY

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hi iskoos

i had a throttle servo run great on the bench , and then go full on when the engine started , not only made for an exciting time , but changed the way i deal with throttle servos since

i am sure some would argue that it is not needed , but i unhook the throttle linkage for the first run on a new throttle servo , once the engine is running you can see if the servo is behaving the way it should and not glitching , if it is going nuts , at least it won't be running the engine up to full

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01-19-2009 01:59 PM  9 years agoPost 8
Pinecone

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Maryalnd

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Why Futaba?

Hyperion has a nice line of servos, digital, some with metal gears and single or dual ball bearings. And cheap.

Also, for mini, something like a Hitec HS-5085. Ball bearing, digital.

Terry
Blade CP Trex 450 SE
QJ EP8v2 EX Gaui Hurricane 550
Vibe 50 Bergen Intrepid Gasser

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01-19-2009 03:04 PM  9 years agoPost 9
iskoos

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Orlando, FL

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copperclad
Yeah mine is just fine on the bench. It starts acting up when the engine is running. It is getting lazy and sometimes gets stuck. Yesterday, it was responding as if there was a 1 second delay on the servo. So I wanted to shut off the engine and realized that I could only reduce the pitch and the engine was reving up insane with 10 degree negative pitch. After about 2 seconds, it decided to listen to the radio and it shut down the engine. It scared the crap out of me. Waiting for a half a tank gas to burn on a gasser could be 20+ minutes. What a nightmare would it be???

On your test, how do you make sure the engine will run the way you want it to? Do you keep it at idle by adjusting the idle-up screw on the carburator?

Pinecone
Futaba. Because all my electronic gears are Futaba. No reason to break the rule for a throttle servo...

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01-19-2009 03:20 PM  9 years agoPost 10
copperclad

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NY

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Hi iskoos

with mine , the second the engine started , the throttle servo went full to it's stop , and that just happened to be full on for the engine

what i have been doing , is on first run of a new machine , just detach the throttle linkage , and start the engine , in idle , you can then move the sticks to see all servos function smoothly , and i will grab the head and just blip the carb ( slight rev ) , while watching the servos ( throttle servo ) , if all this goes well , then shut it off , and hook the linkage back up , it only takes a minute , and i feel it is well worth the time

i think the bad servo i had , was effected by the engine vibes , like it had a loose component , or the pots wiper was bouncing , i spent time with it , re-routing the servos lead , and it didn't help so i don't think it was picking up a stray signal , and it seemed solid till the engine started , then look out , and i know what you are saying , it scared me good , like having a tiger by the tail

.

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01-19-2009 04:16 PM  9 years agoPost 11
iskoos

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Orlando, FL

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gotcha now...

I will do the same test with main blades off to increase the safety measure. Man, your servo was worse than mine. Going on full throttle the second the engine starts must be something... Ouchhhh...

I checked the servo visually and moved the wires around to see if I could find a loose contact but didn't help. I too am sure this caused by engine vibration. It took a toll on the servo...
I hope same won't happen with the cyclic ones...

If you guys were to pick between s3010 and s3151. Which one would you go for? Trying to see if digital has any advantage over the analog for this job

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01-20-2009 01:26 AM  9 years agoPost 12
rbort

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Franklin, MA - USA

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DO NOT USE 9202 servos in gassers
I tried them years ago and they are the worst, WORST servo you can put in a gasser. For some reason they are not vibration proof at all, and they will fail in short order by stopping to move as you experienced. In my opinion that was the worst futaba servo I ever came across. Use the in airplanes on throttle and rudder, that's about all I trust them in, and never in helis.

I've been using a 9252 for quite some time on my Spectra-g and its proven to be quite reliable -- I put in in on 8/3/07 at flight number 334, and I'm at 595 now and its still going strong. In my books any servo that lasts 300 flights has done well, anything over that you're taking chances its best to replace it and sleep comfortably.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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01-20-2009 01:46 AM  9 years agoPost 13
CNCjunkie

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Kauai (The Garden Isle), Hawaii - USA

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S9252!!! sure if would be sweet. I just don't have $85 to throw on a throttle servo at this moment...
Readyheli carries them for $10 less.

iskoos, How much do you want to save now and pay later if a cheap servo causes a major crash?

I wouldn't take the chance myself. Too much time and $$$ invested.

Just another crappy day in Paradise....Aloha!

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01-20-2009 02:03 AM  9 years agoPost 14
jschenck

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La Vista, NE.

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So the general consensus is the 3151,3152,3010 are not a good idea?
Also, just relaying my own experience on nitro machines the 9202 has worked well for me on some Raptor's even over a few years and a few nasty crashes. Of course this is a plastic framed heli so perhaps that dampened the vibs out but I have a 9201 that ran the throttle for a while and did not fail. I was always under the impression that the 9252 was a 9202 with a digital amp (??). I realize that a CF framed gasser is a different ball game. I have seen others post using 3 pole motored servos on the throttle of their gassers.

This is just meant as a query and discussion point, my experience with gassers is limited to my 5 gallons so far through my Predator and probably 3-4 gallons flying someone else's GSR which used a JR 811 on throttle (and initially on the swash! - changed to 8311's).

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01-20-2009 02:32 AM  9 years agoPost 15
iskoos

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Orlando, FL

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Hey Raja, You do not need to swear man. I do believe you 100%.

For some reason I never felt comfortable with these 9202 servos on all around my spectra-G after this throttle servo failure. I will start upgarding all 3 cyclic servos as well.
For throttle though I plan on using either s3151 or s3152. I really do not see any reason to use beefy 9252 on throttle.

I was also thinking that 9252 is digital version of 9202 and I still think so but it looks like the difference is big...

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01-20-2009 02:43 AM  9 years agoPost 16
jschenck

rrProfessor

La Vista, NE.

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Everything I've read (no experience, offering heresay) the 3152 is much better than the 3151, same cost. 3151 gets sloppy very fast.

My experience I have 9252 that have been on one of my Raptor-50's for almost 3 years. Great servo, very happy on my Raptor but I wouldn't run them on swash of a heli running 700mm blades that I intend on throwing around. I also have used 9451's with great results on the 50's again. I put 9351's on the swash of my Predator and am exceedingly pleased with the results. I wouldn't put anything less on. If money was no object for my swash I'd probably put the BLS-352's on.

http://www.gpdealera.com/cgi-bin/wg....pgm?I=FUTM0554

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01-20-2009 03:06 AM  9 years agoPost 17
bosshoss

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Chicago, IL

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9252 on my Spectra G throttle.

Just like the gasser planks, you gotta have one that is vibration resistant. Mounted and Linkaged up correctly.

Why Hover a Yak, when a Heli does it better?

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01-20-2009 03:18 AM  9 years agoPost 18
jschenck

rrProfessor

La Vista, NE.

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Curious, were you running a metal servo arm?

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01-20-2009 06:44 AM  9 years agoPost 19
pgkevet

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Wales

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My experience I have 9252 that have been on one of my Raptor-50's for almost 3 years. Great servo, very happy on my Raptor but I wouldn't run them on swash of a heli running 700mm blades that I intend on throwing around.
Interesting because that's excatly what Ron sent me for both my gassers and they have been fine except when they hit the dirt and then it's a cheap gear set.

If I was doing it again then I'd likely try the align ds620's on cyclic that I put on my 600's. Good price, blindingly fast and more torque.. if there's a larger wheel to fit.

pgk

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01-20-2009 02:17 PM  9 years agoPost 20
iskoos

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Orlando, FL

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My experience I have 9252 that have been on one of my Raptor-50's for almost 3 years. Great servo, very happy on my Raptor but I wouldn't run them on swash of a heli running 700mm blades that I intend on throwing around.
Well, I didn't understand what you mean by that. You mean s9252 are not good enough for 700mm blade sized helis?

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