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HelicopterAlignT-REX 700N › Whats a good throttle servo for the 700??? I cant figure out what to use.
12-28-2009 08:56 PM  7 years agoPost 21
HiroboFreak

rrVeteran

Central Coast, NSW, Australia

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but with CCPM and good cyclic servos (read DS610 @6V, 8717 @6V+) it is entirely possible for them to reach pitch before the throttle servo does even with no load. Of course like I said before, this will be noticeable with hardcore 3D.
I can feel a difference in .18 and .08, like I said before, the engine lags and bogs more.
You're missing the point.

When loaded, the engine takes much longer than .1 sec to respond & reach commanded rpm.

T-rex700n VBar 5.3 Pro | T-rex700e DFC VBar 5.3 Pro | JR DSX9
Team RCBits | Team Lynx

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12-28-2009 09:13 PM  7 years agoPost 22
RappyTappy

rrProfessor

North Denver, Colorado

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Ok, so why make it even longer to react. At least its .10 FASTER and I wouldn't be saying its better if I didn't test different servos back to back with and without a governor/rev limiter activated and didn't feel a actual difference in flight. I'm a cheapo and would rather save the cash, but the difference I could feel in hard 3D. It's not like its unflyable with a slower servo, but it definitely gives it a better edge and feel using a quicker one, its not for waste.

AGain, even though it takes time for the engine to respond to the call for more air and fuel, Like I've SAID ALREADY, it is at LEAST .10 seconds FASTER! Not too hard to understand.

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12-28-2009 09:14 PM  7 years agoPost 23
jschenck

rrProfessor

La Vista, NE.

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Another thought to add - when you are hitting it hard on the deck with a gov/rl running it's going to be pretty much somewhere between 3/4-full throttle at any collective setting. Even without the gov. if you are running cyclic mixing you'll most likely be running 3/4-full all the time throwing it around anyway. The throttle servo just doesn't have to move that much. But again I don't throw it around like that so it's all just conjecture for me. I would speculate that most pilots are in the category where a .08 throttle servo and a .18 throttle servo would not make any difference.

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12-28-2009 09:14 PM  7 years agoPost 24
USNAviationjay

rrElite Veteran

Houston Tx USA

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I use Hyperion DS20GMDs on my throttles.. tail servo metal gear double ball bearing.. super fast.. and cheap.

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12-28-2009 09:17 PM  7 years agoPost 25
RappyTappy

rrProfessor

North Denver, Colorado

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yes, jschenck, not every pilot is gonna feel it, if you're out sport flying or doing mild 3D, a $10 servo with .25 speed will work out just fine. I try to talk about what I have actually done and tested and this I did test and for MY flying style the faster servo definitely made a difference. Too many opinions on here sometimes combating what guys have actually tested.

Reminds me of the time I removed the spring from my TT53 throttle barrel and guys where saying that it would change the tune of the engine. I went out and started my heli in the garage and pushed and pulled on the barrel and it affected nothing and still guys told me it would change, yea ok.

BTW, don't fly nitro anymore currently because I really enjoy the instant kick and torque of electric motors.

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12-28-2009 09:25 PM  7 years agoPost 26
HiroboFreak

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Central Coast, NSW, Australia

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BTW, don't fly nitro anymore currently because I really enjoy the instant kick and torque of electric motors.
I'm confused.

Judging by the above comment, you obviously agree that nitro motors take time to respond to throttle changes, but dismiss the fact that they take longer than .01 sec to respond so getting as faster servo is pointless?

LOL

No point anyone trying to convince you.
Enjoy.

T-rex700n VBar 5.3 Pro | T-rex700e DFC VBar 5.3 Pro | JR DSX9
Team RCBits | Team Lynx

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12-28-2009 09:28 PM  7 years agoPost 27
RappyTappy

rrProfessor

North Denver, Colorado

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not even gonna continue. Have fun flying.

and re-reading my post.

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12-28-2009 09:43 PM  7 years agoPost 28
HiroboFreak

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Central Coast, NSW, Australia

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Once again you miss the point.

What I am saying is even if the engine only took .25 sec to respond, having a servo which takes .08 sec will have no advantage over a .1 sec servo.

.08 sec to sweep 60° , at 3D rpm the throttle sweeps less than half of that, so effectively <.04 sec. The engine doesn't respond anywhere near that fast.

Also remember that the head also doesn't speed up or slow down instantaneously due to inertia. If it did, we'd be killing one-ways & maingears etc every hard flight.

If you want a superfast servo, that's a personal preference, but unnecessary.

The purpose of the thread is what is a good throttle servo for a T700.
No point spending top dollar for a super servo when any nice servo is more than adequate.

T-rex700n VBar 5.3 Pro | T-rex700e DFC VBar 5.3 Pro | JR DSX9
Team RCBits | Team Lynx

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12-28-2009 09:52 PM  7 years agoPost 29
RappyTappy

rrProfessor

North Denver, Colorado

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Ok, sounds good. Never ever would've thought of that.
Looks oh so good on the keyboard, but just don't tell my heli that.

Oh and I never said you had to have a super fast servo. Don't know what post you're reading of mine.

Edit:
No point anyone trying to convince you.
Enjoy.
Wow, you're the one telling me what I tested for myself with a actual heli is not true and there is no difference. I came on here to give my experience and now I'm trying to be convinced it never happened and there is no difference. Wow, that is too good. Quite rude as well to make it personal like you did and try to make me look like I'm some stuck up guy spouting BS. Thanks. Really appreciate that.

sorry scotty3 for the thread jack bud. Hopefully you choose a servo that will work for you and your flying.

Best Regards,

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12-28-2009 11:51 PM  7 years agoPost 30
scotty3

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houston, texas - united states

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not a problem, i kinda agree with you on the servo ordeal. It makes since that it would still make it a little bit faster. The fuel would load up faster than if it were slower servo.

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12-28-2009 11:55 PM  7 years agoPost 31
colsy

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Cambridge, UK

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I seriously doubt that there is a 'run-of-the-mill' servo available that is too slow.

Col.

Only Quote From Experience.

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12-29-2009 12:09 AM  7 years agoPost 32
scotty3

rrApprentice

houston, texas - united states

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i think you might be suprised

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12-29-2009 12:25 AM  7 years agoPost 33
colsy

rrElite Veteran

Cambridge, UK

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Show me a common of the shelf standard servo thats toooooo slow.

Suprise me.

col.

Only Quote From Experience.

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12-29-2009 12:31 AM  7 years agoPost 34
RappyTappy

rrProfessor

North Denver, Colorado

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i kinda agree with you on the servo ordeal. It makes since that it would still make it a little bit faster.
Nothing to agree with me about, its just a fact that it will make it respond faster. .10 seconds faster is .10 seconds faster. How anyone finds that offensive or can argue that is beyond me.

It doesn't really matter how fast or slow the engine responds, the fact is a faster servo at least gets it to start to respond sooner. You'll only really notice it during hard 3D with quick pitch changes and such, otherwise, a .22 sec servo will do just fine.

It's the same thing with these guys about radio latency. Keyboard fliers say it doesn't matter when many guys have flown different radios back to back and can tell a difference. It's not gigantic like the heli will fall out of the sky, but its still a difference.

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12-29-2009 12:33 AM  7 years agoPost 35
scotty3

rrApprentice

houston, texas - united states

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it gets the ball rolling sooner basically

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12-29-2009 12:42 AM  7 years agoPost 36
RappyTappy

rrProfessor

North Denver, Colorado

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yep, and that makes a difference.

Maybe they're just mad that some guys can tell the difference and they can't, I don't know.

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12-29-2009 03:01 AM  7 years agoPost 37
natew

rrApprentice

Brattleboro,VT USA

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Col,
Hows this one? Prob. work fine on my 700 right

Type: Analog
Torque: 66.77 oz/in
Speed: 1.25 sec/60°
Dimensions (WxLxH): 0.73 x 1.52 x 1.32in
Weight: 1.72 oz
Bushing Or Bearing: Bearing
Bearing: Single
Motor Type: 5-pole Ferrite
Gear Type: Nylon

Trex 700, Trex 500, Trex 450 Pro

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12-29-2009 03:35 AM  7 years agoPost 38
rotaryfalcon

rrApprentice

S.E. USA

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I agree that a reasonably quick throttle servo is good, but if really quick is the point why not run a 9254(money no object) I have never seen on on a throttle.

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12-29-2009 04:32 AM  7 years agoPost 39
SteveBeck

rrNovice

Spartanburg, SC

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If you are using a governor which you are on this 700le you dont really have to have an extremely fast servo. Really if your using throttle curves. I know guys running a cheapo hobbico on the throttle because all it does is move the carb and with the gov. you are are staying at a constant rpm when in idle up 1 and 2.

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12-29-2009 05:48 AM  7 years agoPost 40
RappyTappy

rrProfessor

North Denver, Colorado

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I've seen tail servos used as throttle servos before, but big$$. So to get tail servo like speed and appease my high performance on the cheap taste, I used 9257 servos for the throttle. Worked brilliantly with .08 speed and can be had for $59 new or just pick one up used for like $40 or less.

I had a standard size 9001 on 6V and switching to the 9257 on 4.8V was like night day, so much more responsive and less bogging with quick pitch changes, felt like the engine gained horsepower because the engine was reacting quicker and not trying to play catch up to the pitch. I switched the servos out back and forth and few times and was pretty well assured from my heli that doubling the speed of the servo was well worth doing.

To get them to fit into standard size servo frames, I made a little adapter plate once that did the trick. Ely Q has a sweet little servo adapter that can be bought which I found later which fits mini servos into standard size servo mounts.

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HelicopterAlignT-REX 700N › Whats a good throttle servo for the 700??? I cant figure out what to use.
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