Govenor or Rev Limiter?

[callum]

Hey Guy's

As some of you know, I'm into Hard/Extreme 3D, Just looking at what to upgrade to in the near future, so:

Govenor or Rev Limiter, and Why?

-Callum

[Asid]

Hi Callum

For your style i think a rev limiter because you can just set a 100% flat throttle curve. Because your limiting it down the way from 100% to the preset value it is faster as the servo is not going up and down like a govenor.


However the newer govenors like the multi gov pro have better software than older govenors and the can "anticipate" the needs of the model.

My 2 cents

[J-S-Q]

For your style i think a rev limiter because you can just set a 100% flat throttle curve. Because your limiting it down the way from 100% to the preset value it is faster as the servo is not going up and down like a governor.

I don't understand how it's any faster. You still fundamentally have a target headspeed and the servo will have to adjust throttle to achieve that. Isn't it just an academic point as to whether it's limited or governed? Or am I missing something?

Personally I don't like the idea of the 100% flat curve because you'll be likely to damage the engine in the event of a sensor failure although obviously this approach would work (with either a governor or a limiter).

[simm0]

we use neither on the raptor 90 and just use cyclic to throttle mix and fly the pitch..stuart mott used to do this also..his head did fly of at the masters tho but that was a JR ooooops

revlimiter--- id say myself

cheers craig simmons

[jamiem]

I agree with jsq. Neither will be any quicker as they are both working to hold a target rpm. I personally prefer a governor for the same reason; you could very quickly get in to trouble if the sensor fails.

Set your throttle curves as best you can without any gov/limiter, set an ail to throttlemix and a ele to throttle mix then enable governor. Personally I've always used CSM revlock 10's. They are cheap and work very well if setup correctly.

[waveydavey]

Set your throttle curves as best you can without any gov/limiter, set an ail to throttlemix and a ele to throttle mix then enable governor. Personally I've always used CSM revlock 10's. They are cheap and work very well if setup correctly.

How do you go about setting the mixes, what are you looking for and why Cheers

[simm0]

the difference between the two maybe explained here
Model Avionics
regards craig simmons

[Andy from Sandy]

How do you go about setting the mixes

RTFM. Then Raptortechnique.com

In your TXs mix menu you should find the entry to set this up. The values will be trial and error to maintain the headspeed.

You need these if you are not running a governor because unlike pitch that also opens the throttle you need this extra way of telling the throttle to open when you increase the pitch of the blades with cyclic pitch.

[waveydavey]

RTFM. Then Raptortechnique.com

In your TXs mix menu you should find the entry to set this up. The values will be trial and error to maintain the headspeed.

You need these if you are not running a governor because unlike pitch that also opens the throttle you need this extra way of telling the throttle to open when you increase the pitch of the blades with cyclic pitch.

Thanks for the help, already RTM (left out the expletive because I'm just not like that) for my Tx and understand what the mixes are for. I read the post and took it that the mixes were working alongside/in tandem with the governor, I was asking what to look for and why this helps.

Thanks in advance

[Lynx.1677]

You can use both a gov and rev limiter if you so wish. Personally I decided to stick with the govenor as it has a built in fail safe. If the gov fails it just goes back to my preset curves which are conservative.

[Andy from Sandy]

I was asking what to look for and why this helps.

Some governors have a facility where they can anticipate supposedly a possible need for power. So by using the mixes you are telling the governor to keep a close watch on the headspeed as it might start to drop as there has been an increase in the throttle.

[waveydavey]

Okay I get it I think by using the mixes even with a governor your helping the governor to kick some throttle in before it's actually needed, as you apply say back elevator going into a big loop before the head starts to decay you are already preempting this with the mix. Methinks I need lots to counteract my big geordie thumbs. Cheers

[Steve]

If you're running a 3D heli at 2100 or 2200 rpm head speed than it's going to be at full throttle just about all the time anyway, so in the event of a magnet failure, you hardly notice the difference.

A chap at our club uses RevMax limiters on his helis (as do I on 2 of mine) and on more than one occasion his 90s and 50s have thrown magnets, and you'd be hard pushed to notice the difference until you bring it down to hover and land. So the idea that it's gonna wreck your engine is a myth.

Limiters only limit the engine speed, governors govern it.

A limiter only operates when (a) the throttle is above 25% on the curve and (b) the engine speed is above the target value. So what people do is set the throttle curve to 100% flat line to ensure the limiter is active all the time.

[Delta7]

Bringing this few month old thread back to the surface again, I just wanted to ask as I have just got a TJ Rev Limiter, (thought I'd better invest in protecting my engine a bit) as my head speed on my rappie 50 was measured at around 2100 whic I'm told is too high. (non 3d - just mild aerobatics), if by using an auxilary channel that a 7 channel tx & rx is enough and if so can I safely Y lead a connection off to a voltspy as well as this Limiter?
My 2nd part to this lot, is what is the ideal headspeed on my model for my sort of flying too please?

[trillian]

Bringing this few month old thread back to the surface again, I just wanted to ask as I have just got a TJ Rev Limiter, (thought I'd better invest in protecting my engine a bit) as my head speed on my rappie 50 was measured at around 2100 whic I'm told is too high. (non 3d - just mild aerobatics), if by using an auxilary channel that a 7 channel tx & rx is enough and if so can I safely Y lead a connection off to a voltspy as well as this Limiter?
My 2nd part to this lot, is what is the ideal headspeed on my model for my sort of flying too please?

Ya know, I have thought a few times when I was out there your headspeed was quite high but I just figured maybe you like it at that speed. I have a TJ on one of my Robbes and I think it's doing something but I need to really figure out how to set it properly. My Hirobo has a CSM revlock 10 and it works very well. I've been running that heli at about 1800 / 1850 and IMHO it flies very well at that speed. For more aggressive flying it might need to be 1950 ish so there's enough energy in the rotor and the engine is at peak horsepower.