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Gasser Model RC Helicopters

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gasser throttle servo

tim225

Senior Heliman

N Wales (UK)

My Vario benzine trainer is using 4x 9202 servos as recommended for the swash.Could I use a JR DS811 servo for the throttle? as I have a new one lying around.
The spec for the 9202 is 5kg/cm and 0.22/60 whereas the DS811 is 4kg/cm and 0.21/60.
I'm just not sure whether it's ok to use.
Thanks in advance
Tim

Vario Bell 230 Gasser,Vario Benzin Trainer,T-Rex 600N, Hirobo Shuttle Plus,Century GL450SE

04-17-2008 Over year old.
Peterr

Senior Heliman

Queensland Australia

Yep , it'll have plenty of power and speed for the job .. however lots have found , me included , that digital servos seem to have a rather short life as gasser throttle servos.. my spectra g's are now using hitec 422's on throttle, they have outlasted the previous 811's and 9252's by a large margin !!

E ,N ,G Whiplash's;Spectra G's;Stratus;E&N Razor,Fury 55;Furion6;Aeolus; BeastX ,XPS.

04-17-2008 Over year old.
HOMEPAGE  
Paul-PJH

Senior Heliman

The Netherlands

I want to use a plain futaba 3001 servo for throttle. Could I use this for a gasser? When checking it seems to have no problems to control the butterfly valve (with spring). Or is it better to use a different servo?

Thanks Paul

04-17-2008 Over year old.
Shiro Muji

Veteran

Japan

Hi Paul, as per experience do not use 3001 in your throttle, although it will do its job but it cannot withstand the vibration coming from a gasser engine. I am using a sanwa analog ERG-RZ so far so good.

Maxum with Hanson 3D Max, Maxum Nitro, Maxum 30.5cc modified engine, RH Generator, Sceadu .50Hyper

04-17-2008 Over year old.
shuttlepilot

Elite Veteran

Mullins, South Carolina

I'm using a Futaba 3151 on mine and it has been working fine for at least 40 hours of flying. I wouldn't use the cheapest servo for the same reasons that Shiro Muji stated, but you don't need a very fast or "expensive" servo.

Gas is Great
Camper Fuel is Better!!
QWW Helis

04-17-2008 Over year old.
Eury

rrProfessor

Nottingham NH

3151 in mine as well, works great.

Nick Crego

Citizen #0168

04-17-2008 Over year old.
victor55ca

Senior Heliman

Vancouver BC

I have a 9252 on my throttle servo. Why do the digitals have longevity issues at the throttle position?

Vince

04-17-2008 Over year old.
tim225

Senior Heliman

N Wales (UK)

Thanks for the replies guys,it looks like i will be using it for breaking the engine in and then swap it for a different servo.

Vario Bell 230 Gasser,Vario Benzin Trainer,T-Rex 600N, Hirobo Shuttle Plus,Century GL450SE

04-17-2008 Over year old.
Shiro Muji

Veteran

Japan

guys just a question, this is still related to throttle servo. What i've notice today about my analog sanwa erg-rz is that when you power on the receiver without turning on the radio it is as if no current is entering because it doesn't hold like a digital servo. is it normal to an analog servo? however if you turn-on the radio, the servo is working fine.

Maxum with Hanson 3D Max, Maxum Nitro, Maxum 30.5cc modified engine, RH Generator, Sceadu .50Hyper

04-19-2008 Over year old.
monkey nuts

Senior Heliman

chester england

paul pjh
ive fitted a 3001 servo on my gasser, its lasted about 9 flights, i have installed a new engine coz my previous was second hand. was flying it today then refuelled, started to hover and the engine speed seemed constant but wasnt running right and it couldnt be tuned. anyway took the blades of and put head loaders on and to my suprise when operating the servo the throttle arm is up and down all over the show quite quickly. id like to try hitec hs645mg any comments about using that?

05-18-2008 Over year old.
jschenck

rrProfessor

La Vista, NE.

I would think that metal gear servos on the throttle would not be the best choice.

Does anyone have experience or thoughts on the Hitec 525 on the throttle? I have ran them for a few years on my Raptor's and they do great there. I know it's not the same environment but they are a nice servo for the money. 5 pole motor and seem to be reliable pots and amps.

Team GrandRC

05-19-2008 Over year old.
AceBird

Elite Veteran

Utica, NY USA

Does anyone have experience or thoughts on the Hitec 525 on the throttle?
I am using 625 MG's on my predators.

Ace
What could be more fun?

05-19-2008 Over year old.
erichevy

Veteran

Zevenhoven The Netherlands

I am using 625 MG's on my predators.
Oh boy, Aceboob does it with metalgears...

05-24-2008 Over year old.
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Gasser Model RC Helicopters

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gasser throttle servo

Red-Rx7

Senior Heliman

Olathe, KS - USA

Question as well....

I just picked up a Vario Benzin-Trainer, and it looks like it can run in a 3 or 4 CCPM setup. I have 3 JR 8717's, and two Hitec Super Sport 425 BB servos.

Should I:

A) Buy another JR 8717 and run in 4 Servo Setup, and use the Hitec SS 425BB on the throttle?

B) Run just the 3 JR 8717 in a 3 Servo Setup, and use the Hitec SS 425 BB on the throttle?

C) Buy another JR 8717 and run in 4 Servo Setup, and a different servo for the throttle?

D) Run just the 3 JR 8717 in a 3 Servo Setup, and a different servo for the throttle?

E) Do something completely different?

I didn't want to spend a whole bunch on a complete new set of servos; unless it was basically nessesary. I don't mind spending 150.00 to get another new JR 8717 (the other 3 are new); and possibly a new throttle servo if required.

Thanks.
Mike

05-24-2008 Over year old.
pgkevet

Key Veteran

Wales

If your tx can handle the 4-servo swash then that has to be the most robust option

pgk

05-24-2008 Over year old.
Red-Rx7

Senior Heliman

Olathe, KS - USA

If your tx can handle the 4-servo swash then that has to be the most robust option

pgk
I have a 14MZ, so I assume it should. What about the throttle servo selection?

Thanks,
Mike

05-24-2008 Over year old.
AceBird

Elite Veteran

Utica, NY USA

I would say the 425 BB is fine for the throttle. that is pretty much all I used on my gasser planes.

Ace
What could be more fun?

05-25-2008 Over year old.
Toadster25

Key Veteran

Iowa

I have been using a fut3003 for quite a while but I just bought a new one today even though it was working fine. I also had an jr811 fail.

05-25-2008 Over year old.
Red-Rx7

Senior Heliman

Olathe, KS - USA

I was talking to Joe Howard today about the servo situation, and he recommended using the same servos that is used for the Cyclic controls; else response times between fast cyclic inputs and actual throttle can cause bogging, etc.

With that being said, I feel funny putting a JR 8717 servo on the throttle. In trying to adhere to what Joe was recommending, can I just grab any servo that has a decent speed near .09? Maybe a .10?

What type of torque is needed for the butterfly valve on the G230RC motor?

Can I use something in the 30oz-in range?

05-27-2008 Over year old.
jschenck

rrProfessor

La Vista, NE.

Two reasons why you do NOT need a fast throttle servo:

1. There is virtually no load on the throttle servo. It moves faster than it would as a cyclic servo because it doesn't have much to push/pull.

2. The throttle servo moves way less than 1/2 the movement of cyclic servos. That is, in an extreme example, during a tic-toc the cyclic servos will swing nearly their full travel while the throttle servo will move say 25%. Properly done tic-toc on a gasser will probably use 30% to 60% throttle. The way I do it they go to 100% but seriously probably already have the power at 50% throttle.


Also, I wouldn't put a metal geared servo on the throttle. Put a reliable analog nylon geared servo on the throttle.

All my opinion, I don't have a lot of experience yet. I will tell you that I'm running a Futaba 3010 on my Predator gasser and it was doing just fine with aerobatics yesterday.


EDIT - One other item that I think is important with a gasser throttle servo: accuracy. Since a small adjustment in throttle makes a big difference in power you want the servo to be accurate and slop free. Perhaps a good coreless servo. My 3010 is not coreless but I may change it out (later) for a 9202 which meets all these requirements.

Team GrandRC

05-27-2008 Over year old.
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Gasser Model RC Helicopters

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gasser throttle servo

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