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Boca Bearings . ExperienceRC . JR AMERICAS
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Rev limit vs. Governor

UH-60PILOT

Veteran

Round Rock, Texas

I see that Spectrum now has a receiver with a rev limiter built in and a very nice sensor that mounts to the backing plate of the engine. I've never used a rev limiter and wonder how it compares to a governor.

Kenny Thompson

01-05-2009 Over year old.
george0079

Elite Veteran

USA

They both do the same basic thing. They prevent the engine from over-speeding, and causing damage.

A governor is designed to hold a constant engine speed. A rev limiter let's you use your throttle curves, while preventing the engine from going past a set RPM.

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

01-05-2009 Over year old.
Heli 770

rrProfessor

Lemon Grove, Ca. USA.

They actually have different functions, Better off with the governor.

01-05-2009 Over year old.
Jeff polisena

Elite Veteran

westpalmbeachflorida usa

All depends what use your need . Gov takes over throttle not using curves so you have a smoother transition where a limiter uses curves so you have a faster response on servo for rapid tricks.Governor takes more time to translate RPM .

On a limiter you set curve at 100 % across like an electric this will give you a constant rpm with a fast transit time

I stole it ,flew it and gave it back ;)

01-05-2009 Over year old.
Helinutnz

Elite Veteran

below 42 South

out of all I have tried I love the revmax the most. 100% flat line curve and never let me down. Set the speed with the gov function on the 12X. Believe it or not it holds my headspeed more constant than my governors on 3D.

If it fails hit Throttle hold and auto down or get into normal mode without the gov.

Better at holding the speed than my TJ pro. Definately better than the ATG.

I like the rev max limiter and would use it over the gov unless it's a scale machine or mild flying like my F3C machine or scale defender. One runs a TJ pro and the other the ATG. Rev max on the trex 700N.

From my experience the limiter is better for 3D.

01-05-2009 Over year old.
KennyS

Key Veteran

Marble Falls, Tx

The ATG holds like no other and is the best I have ever flown. The ATG was designed and is flown by a world champion.

Team Next D, Team JR

01-05-2009 Over year old.
Helinutnz

Elite Veteran

below 42 South

The ATG holds like no other and is the best I have ever used or flown. The ATG was designed and is flown by a world champion.
with the greatest respect....I haven't found that to be the case.

01-05-2009 Over year old.
rccarguy

Veteran

Boston MA

I've got a Spektrum AR 7100 R in my Raptor 50 and love it. It's my understanding it's Revmax technology built into the RX, so works the same way. I just like the idea of not having to hang another widget someplace on the heli, or worry about gluing magnets to fans and having them stay there

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

01-05-2009 Over year old.
Helinutnz

Elite Veteran

below 42 South

I've got a Spektrum AR 7100 R in my Raptor 50 and love it. It's my understanding it's Revmax technology built into the RX, so works the same way. I just like the idea of not having to hang another widget someplace on the heli, or worry about gluing magnets to fans and having them stay there
True as long as you don't have an RX problem and need to change it for another one to keep you flying at a meet that doesn't have a gov in it or have one part of the RX fall (like the gov function fail in it) or you have to replace the whole unit. It's a great idea to integrate electronics. I have a 611 gyro amp stuck on my 700N and quite frankly would rather not have to have the weight or complexity so the concept is good. Just have a spare RX or gov that will work with your sensor to keep you flying in case you have an issue at a meet where one part of an integrated system may fail.

BTW....use 30 min epoxy on magnets and never had them fly off. I drill a small hole behind them to allow air out when glueing them in. Sand the surface and scratch the inside of the magnet hole on the fan. Never come off.

01-05-2009 Over year old.
KennyS

Key Veteran

Marble Falls, Tx

with the greatest respect....I haven't found that to be the case.
With respect we can agree to disagree.

Team Next D, Team JR

01-05-2009 Over year old.
Helinutnz

Elite Veteran

below 42 South

with the greatest respect....I haven't found that to be the case.
With respect we can agree to disagree.
Sure. My ATG hunts for the rpm when coming off the power and this is covered in the setup manual where they tell you about limiting this effect if it happens yet doesn't help me. Thats why it is relegated to scale duty where the head speed is mostly kept within easy tolerances. It is bigger so harder to find a place to fit it than the revmax and takes longer to setup with the button pushing and doesn't hold the headspeed as well for me. On the revmax there is no appreciable change in headspeed throughtout the entire range even though it is just a limiter. Takes ages to setup as well....about 5 seconds
The ATG was designed and is flown by a world champion.
This means what?

01-05-2009 Over year old.
relax1

Senior Heliman

Tampa, FL

I have found the limiter to work very well.

01-05-2009 Over year old.
Jeff polisena

Elite Veteran

westpalmbeachflorida usa

Opinions will differ due to flying style . Ive tried them all and the limiter works best for my flying.I run high head speed and fly hard with rapid transitions.

I stole it ,flew it and gave it back ;)

01-05-2009 Over year old.
red_z06

rrProfessor

Dumont, NJ

Although most use 100% curve for RevMax, there is a benefit to setting it at ideal rpm + 50. Using this curve, RevMax will not try to reach the set RPM with overly rich engine by opening the carb.

RevMax will pull the rpm down to the set level while a gov will pull up or down the rpm to a set level. RevMax will allow you to tune the engine (only if you use the TC while a gov needs to be turned off to do the same)

It also allows you to continue to fly normally with the RevMax turned off when it fails (no 100% throttle ).

www.JustinJee.com

01-05-2009 Over year old.
HOMEPAGE  
AaronJohnson

Elite Veteran

mason,MI

+1 REvmax limiter, 100% throtle curves, absolutly seamless flying. cant even tell its there. Cheap and very lightweight. I tune by temps and hard full collective climbouts so running 100% throttle curve works for me. Just my .02

01-05-2009 Over year old.
Helinutnz

Elite Veteran

below 42 South

Although most use 100% curve for RevMax, there is a benefit to setting it at ideal rpm + 50. Using this curve, RevMax will not try to reach the set RPM with overly rich engine by opening the carb.
Don't have your engine over rich.
RevMax will pull the rpm down to the set level while a gov will pull up or down the rpm to a set level. RevMax will allow you to tune the engine (only if you use the TC while a gov needs to be turned off to do the same)
Not true. If the curve is at 100% the carb is always trying to open continuously and the revmax is controlling the carb to set rpm...as soon as the rpm reduces even the slightest amount the carb is opening.
It also allows you to continue to fly normally with the RevMax turned off when it fails (no 100% throttle
True but you lose some of the benefits of the quick power when loading the disc hard. Nothing like having a WOT as soon as you load up during a manouevre. Also I wouldn't want to keep flying if the gov had failed even if I had a close curve that was 50 higher....I'd auto down or flick into normal and land. If you hear a different note while flying it is always best to land to check what has gone wrong...you won't necessarily be sure it's the gov that failed.

01-05-2009 Over year old.
tnbulldog

Senior Heliman

Cookeville, TN

+1 for the Revmax with 100% throttle, works very well.
I have a backup v-curve in Stunt 2 in case the sensor fails.

01-05-2009 Over year old.
tadawson

Elite Veteran

Lewisville, TX

If you hear a different note while flying it is always best to land to check what has gone wrong...you won't necessarily be sure it's the gov that failed.
If you have a correct curve/gov setup, you should have a very hard time being able to tell the difference . . . .

- Tim

Friends don't let friends become electrotarded . . . .

01-06-2009 Over year old.
UH-60PILOT

Veteran

Round Rock, Texas

tadawson
If you have a correct curve/gov setup, you should have a very hard time being able to tell the difference . . . .
Having a perfect throttle curve is not possible by any stretch if you are flying 3D. Example: Apply full collective on a climbout and if sufficient power is available there will be no slowing of the motor/rotor. Now while keeping the collective at full and from a high altitude flip inverted and come straight down and see if the rotor doesn't overspeed. I guess this is what you are referring to.

The point is that when we are talking about governing/limiting rotor rpm I think it's better to know when it's not working by hearing it overspeed. At that point I think having a back up (nearly perfect) throttle curve in one of the other idle up positions is a great idea. I'm being a little sarcastic here but you are right as long as you are not unloading the head (positive or negative) you can get a nearly perfect throttle curve. I've done exactly that and I can say that no matter how perfect your throttle curve is, your gyro will never work on curves as well as it will with a governor/limiter. Can you or anyone else here elaborate on gyro performance with a governor vs a limiter?

Kenny Thompson

01-06-2009 Over year old.
tadawson

Elite Veteran

Lewisville, TX

My reply wasn't to say that you don't need a gov - I use them on everything myself - it was in response to Helinutz who stated that he would land when he heard the big difference in sound . . . the point being, that depending on what you are doing, with a correct setup, the difference is subtle at best, and there should be no urgency to land if a gov drops offline . . . *IF* you have a good setup!

- Tim

Friends don't let friends become electrotarded . . . .

01-06-2009 Over year old.
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Rev limit vs. Governor

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