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Home✈️Aircraft🚁HelicopterThunder TigerOther › Governor vs. Rev Limiter???
02-02-2007 02:42 AM  14 years ago
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uragem

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Indianapolis, IN - USA

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Governor vs. Rev Limiter???
I own both a Futaba GV-1 governor and a TJ Rev-Max (rev limiter). They both work fine. I hear people run a 100% throttle curve on the Rev-Max. Doesn't that just make a rev limiter act like a governor???
Indy Jeweler
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02-02-2007 03:30 AM  14 years ago
chopperman1

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Huntsville, AL

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Yes! Just like a car motor, the governor keeps the car's top speed to the manufactures requiermnets.Cliff
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02-02-2007 12:17 PM  14 years ago
Barney

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Inverness Scotland

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The big advantage of the limiter (Revmax) is if for some reason the engine goes lean the engine does not cook itself.

Heres an example if it goes wrong with a governer..The OS C spec perry pumps were prone to sticking/failing causing your motor to go lean in flight. With a governer the symptoms are masked as all it does is keep ADDING throttle to retain the required headspeed.

Same thing applies for a poor engine setting, Air leak in the fuel system etc etc
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02-02-2007 01:50 PM  14 years ago
DS 8717

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Race cars use rev limiters to control engine RPM,not governors.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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02-02-2007 09:08 PM  14 years ago
PaulJC

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Hertfordshire UK

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With a governer the symptoms are masked as all it does is keep ADDING throttle to retain the required headspeed.
I have to disagree, both a GOV and limiter (100% curves) will continue to open the throttle to 100% to maintain the set HS
Re-entering the atmosphere...
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02-02-2007 10:18 PM  14 years ago
Barney

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Inverness Scotland

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PaulJC..Well...NO!! and Yes...

A revmax will only close the throttle to stop over reving so it depends on how you set it up. If you lift your curves a little above your required head speed and just use it to clip the head speed a little it wont..You can also use Throttle Cyclic mixing to make sure it keeps pace with your power requirements.

If you run a flat 100% straight line throttle it works as a governer then..So No & yes..is the answer HA HA...
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02-02-2007 10:22 PM  14 years ago
PaulJC

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If you run a flat 100% straight line throttle it works as a governer then..So No & yes..is the answer HA HA...
Re-entering the atmosphere...
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02-07-2007 11:20 PM  14 years ago
jbc98c

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washington

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the only real difference i have seen, i have flown both, is that the rev-limiter is faster. the gv-1 is older technology which runs a little slower. dont get me wrong, it's a great governor, but i like the tj revmaxx better.OH! YOU FLY TOY HELICOPTERS?!
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02-08-2007 02:22 AM  14 years ago
Ken Filloon

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Highland, Michigan

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The RevMax is faster, smaller, lighter, and easy to program.
Replacing all my GV-1 governors with RevMax Limiters.
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02-08-2007 05:55 AM  14 years ago
JingshiRap

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Malaysia

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There's is alot diffrences between Futaba Gov and Rev MAX.

Rev Max, eg. during 3D fly esspecially when I do looping then use full negative pitch -10deg to push heli down(not inverted) the rev max reduce the throttle to prevent overspeed between engine and rotor headspeed.(you can hear the engine reduce the throttle)

Futaba Gov, same manuvers , but it's try to maintain headspeed any collective/pitch which it might get slightly more speed when we push to negative pitch.

I can hear the engine rev different sound during flying using Rev Max and Futaba Gov.

Anyway both are good.
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02-08-2007 12:54 PM  14 years ago
BarracudaHockey

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Jacksonville FL

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You can watch a heli with a gv1 flying around through a skytach and the blades are all over the place, watch one with a revlock when the engine is tuned right they move around a bit during transitions but not near as much.Andy
AMA 77227
http://www.jaxrc.com
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02-08-2007 01:14 PM  14 years ago
Tday

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Needham, MA

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Well sure, but that's a reflection of the gv-1 isn't it? I still can't quite see from this thread what the difference is. If head speed is falling, does a rev limiter still add throttle? Or is throttle set by the throttle curves and the rev limiter simply caps it.

If that's the case (most likely given the name "limiter"), then you really need to have aggressive throttle curves so that you're always giving enough throttle. That would mean mixes for rudder, cyclic---and if you could collective acceleration too.

So that makes a rev limiter better than a governor somehow? Does it really keep you from frying your motor if it runs lean?
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02-08-2007 02:00 PM  14 years ago
DS 8717

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To get the most out of a limiter you need a 100% throttle curve.The limiter will try to keep the rpm you set by not letting the engine over rev by closing the throttle when needed. I have found a rev limiter works better on a 50 than larger engines instaed of a governor..DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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02-08-2007 07:02 PM  14 years ago
Barney

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Inverness Scotland

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Why the rev limiter is kinder to your engine if it goes lean.

How it works..

Rev limiter only requires you to set a throttle curve % above the required head speed. I usually aim for around 5% above. So you don't need to run a straigth 100% throttle curve. You can also add mixes (cyclic/tail/throttle)if necessary to ensure you stay above the reqested %. The rev limiter will reduce the overspeed by 'clipping' This mostly occurs in fast decents at or close to zero pitch or when the disk is suddenly unloaded.

Note: If you choose to run 100% straight line setup, it is no less likely to cook an engine than a governer.

Governer

Ok you are running a governer and you get a fuel leak/fuel pump failure etc. What happens is the motor will start to heat up and loose RPM. The governer will then keep increasing the throttle to maintain the requested head speed regarless of the temperature the motor reaches..i.e It will add throttle right up to 100% if necessary therefore severly overheating the motor.

In the same sceniaro with the revmax the motor will start to slow down as it heats..and NO throttle is added to compensate. So you quickly notice something is not right and land to investagate before you fry the motor.

Other advantage of a Revmax, although designed as a limiter it can be run as a governer, very light, compact, crash resistant.

So why fit a GV1 (old technology) after you spent $2000 building the lightest heli money can buy. Essentially you are adding unnecessary weight. Yes it looks pretty but that doesn't mean it's any better. Although I admit a GV1 has the 'Bling' factor compared to the tiny little unobtrusive black box of a Revmax.
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02-08-2007 08:36 PM  14 years ago
Tday

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Needham, MA

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Thank you---that makes sense for sure. The Multigov is a great governor/limiter, btw too---revmax isn't the only one out there and it definitely has some nice bling factor with the separate setup brain box.

Tom
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02-08-2007 08:45 PM  14 years ago
DS 8717

rrProfessor

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[quote]
So that makes a rev limiter better than a governor somehow? Does it really keep you from frying your motor if it runs lean?

You can fry your engine without a governor or a limiter if you run it lean.
YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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02-08-2007 09:57 PM  14 years ago
Barney

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Inverness Scotland

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Yes it's easy to fry a motor but you get a lot more warning running a correctly set limiter. A governer tends to mask the problem.

I have both limiters & governers and I'm just giving you the facts
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02-09-2007 12:12 AM  14 years ago
JingshiRap

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Malaysia

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If head speed is falling, does a rev limiter still add throttle? Or is throttle set by the throttle curves and the rev limiter simply caps it.
I'm really sure that the Rev Max add the throttle at any collective/cyclic . How did I know? Well, my magnet was missing due to loose Fan and hit my sensor. Then I can hear my engine bog down when I full positive and negative pitch( Idle 2 ).When I switch to Idle 1 which I set to 1500 even worse. Look's alike it memorize the servo angle when I set the RPM. By the way my throttle curve 100% flat for my stunt mode.

So I'm thinking that Rev limiter act like Governor too, only the difference (Rev Max) is at any high head speed detect, it lower the throttle. And Governor will maintain at any collective/pitch.
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02-09-2007 12:14 AM  14 years ago
jbc98c

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washington

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but, without a magnet, how would it detect that it was overspeeding. my hypothesis on this, which i hope never to have to try out, is when is stops sensing the engine it goes to a preset range and holds it there. but, i'm not 100% sure on that.OH! YOU FLY TOY HELICOPTERS?!
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02-09-2007 12:25 AM  14 years ago
JingshiRap

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Malaysia

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but, without a magnet, how would it detect that it was overspeeding. my hypothesis on this, which i hope never to have to try out, is when is stops sensing the engine it goes to a preset range and holds it there. but, i'm not 100% sure on that.
That's what I'm think before. When I experianced loosing a magnet,throttle servo memorise at 1800 headspeed at zero pitch, even when I switch Idle switch 1 which it memorise 1500 headspeed at zero pitch. Meaning that the servo stop at the point when I set the headspeed before.

So that the time I'm thinking that Rev Max work's like governor too , maintain the headspeed.
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