RunRyder - gv1 inconsistent rpms

rrTV-PHOTO

New HD TV

HOME rrTV-PHOTO GALLERIES MY GALLERY HELP-FAQ

myHOME PM pmRR MEMBERS 784 ONLINE 73 EVENTS SEARCH REGISTER START HERE

2 pages [ << < ( 1 ) 2 NEXT >> ]

281 views

POST REPLY

GrandRC	.	CanoMod	.	A Main Hobbies
	.		.

Radio - Servo - Gyro - Gov - Batt > gv1 inconsistent rpms

turbocivic4
Senior Heliman
Location: Hawaii Maui

When I do stationary flips etc. I hear the rpms change quite a bit, is there a way to fix this with the gv1 governor? I dont see any sensitivity settings? This is being tested on a trex600n

04-27-2008 11:06 PM

mchammer
Senior Heliman
Location: California,USA

set your idle up throttle curve to 100% at all points so your curve will look like a straght horizontal line.the gov will then always be trying to pull throttle out insted of chasing trying to keep power up with the loaded head.

Peace Through Superior Firepower!!!

05-06-2008 07:06 AM

mchammer
Senior Heliman
Location: California,USA

also set your gv1 to 1950 or 2000 rpm headspeed so it wont bog

Peace Through Superior Firepower!!!

05-06-2008 07:08 AM

npsk8ter
Senior Heliman
Location: Joliet, Illinois USA

so if i set up my gv1 at 2000rpm and a flat throttle curve in idle then the rpms should almost stay perfect and should hold it better? i also have a 600n

05-06-2008 08:15 PM

tadawson
Key Veteran
Location: Lewisville, TX

The GV-1 does *not* consider the curve when it is engages, so all a flat curve will get you is a really, really, tense moment if you ever throw a magnet, and possibly broken head parts, depending on how badly it overspeeds. With a GV-1, flat throttle curves are a really *BAD* idea - considering that the speed is set via the aux channel anyhow. You really need viable curves behind the GV-1 that can be flown *without* the gov on for a reasonable setup. You might also want to try flying without the GV-1 on, and doing some tuning - an improperly tuned engine will bog like you describe very easily, and the gov can't fix that . . . .

- Tim

05-06-2008 08:29 PM

npsk8ter
Senior Heliman
Location: Joliet, Illinois USA

now im really confused! Seems like two opposite answers.

05-06-2008 09:04 PM

tadawson
Key Veteran
Location: Lewisville, TX

I would wager that those recommending flat curves have either never owned a GV-1, or are primarily electric pilots . . . since the flat curve *is* common in the electric world . . .

- Tim

05-06-2008 09:05 PM

npsk8ter
Senior Heliman
Location: Joliet, Illinois USA

thats what i thought bout the curves. not flatline. if i had a sensor failure then kiss the motor goodbye!

05-06-2008 10:46 PM

tadawson
Key Veteran
Location: Lewisville, TX

Correct. If you came off full pitch to descend on 100% flat curves without the gov running, you will overspeed like a daemon, and frankly, I would be more concerned about throwing a blade and losing the entire heli than just the engine . . .

- Tim

05-06-2008 10:49 PM

Jeff polisena
Veteran
Location: westpalmbeachflorida usa

Curves have nothing to do with GV1 once it engages depending on how you set up (switch or stick position ) what servo are you using on pitch and throttle? you could be rich on tuning or servo is too slow for what you need
Also tune motor without Gov on it will hide lean motor

I dont know how to fly just how to not crash !!!!!

05-07-2008 12:48 AM

Rymps
Senior Heliman
Location: Windsor CO

I agree with tadawson
You need to have throttle curves with a GV-1. If you are trying to run 1850 head speed and doing light 3D stuff the GV-1 can not keep up. It is right on the edge of the power band. Raise the head speed to 2000 and try it This is what i had to do. It will still move up and down in RPS but it wont fall below the power band as much.

05-07-2008 04:15 AM

Jeff polisena
Veteran
Location: westpalmbeachflorida usa

2000 just came into play 1850 was the norm and GV1 works fine at this RPM check setup and tuning running at 2000 RPM will put more wear and tear on heli unless you need it for hard 3D just a thought

I dont know how to fly just how to not crash !!!!!

05-07-2008 09:57 AM

tadawson
Key Veteran
Location: Lewisville, TX

For that matter, if you are properly tuned, and have the correct gearing, you may simply have too much pitch in your curves for what the engine can handle . . . . if you fly without the gov, when you hit 100% throttle/collective, does the speed sag? If so, then you need to tweak your pitch curves too . . . . the gov can't help there, that one is still you!

- Tim

05-07-2008 02:18 PM

mchammer
Senior Heliman
Location: California,USA

For the record I do own a gv-1 and am very happy with its performance.I can tell you that it can act as a governor (if your throttle curves are set below the gv1 desired rpm) and it can also act at a rev limmiter if your throttle curve is set above the gv-1 target rpm.I have used it both ways and it will alway be slower to respond to load if it is adding power as opposed to pulling it out preventing overspeed.I sugest you try both and see.If you are running a slow throttle servo the difference using it as a rev limmiter will be more pronunced.If you arent doing any hard 3d it wont matter to you how you set it up.also your gear ratio will affect the ability of the engine to recover rapidly. if the ratio is too high it will be like a car climbing a hill in a high gear and take longer to recover even if the gv-1 has the engine at wide open throttle.

Peace Through Superior Firepower!!!

05-08-2008 01:48 AM

Jeff polisena
Veteran
Location: westpalmbeachflorida usa

mchammer,
Now you did it they are going to ask how you are using as a limiter

I dont know how to fly just how to not crash !!!!!

05-08-2008 10:09 AM

vfastr6
Veteran
Location: Cape Town, RSA

Yeah - how...????

I've been using GV-1s for years and no matter how I set my thottle cuve on the radio I still get the same head speed - except obviously if you bog the thing, but that will happen when you don't manage the cyclics and collective!

I have even tried to make idle up 2 a higher curve than normal (not a flat curve coz as Tim says you will not have a lot of fun when you thow a magnet...

), but higher non-the-less and I saw no diff at all!

The GV-1 will, however, switch off if the engine speed is 70% or less of set speed and throttle stick is set to 20% or less from slow side.

Marc

I'd Rather Be Flying But I Have To Work!!

05-08-2008 05:08 PM

HOMEPAGE

tadawson
Key Veteran
Location: Lewisville, TX

The bottom line is that the GV-1 ignores the curves when engaged, so it can't really do what he claims and run as a limiter . . . especially considering that curved have little to nothing to do with being a limiter! The GV-1 will always try to add throttle on an underspeed, no matter what the curve, and this is exactly what a limiter will *not* do . . .

- Tim

05-08-2008 05:52 PM

Jeff polisena
Veteran
Location: westpalmbeachflorida usa

It can be done this is how I used to set mine up before TJ rev max you manipulate the curves during calibration of GV1

I dont know how to fly just how to not crash !!!!!

05-08-2008 08:44 PM

Hotwings
Key Veteran
Location: Florida, Port Charlotte and West Palm Bch.

one of the ways you can set the gv-1 up is to have the idle setting about 50% so that when you unload the head the throttle doesn't go to far down and have to come back up under load, even 60% or 70% may work better for 3-d.

Please cancel my clearance, I have the field in sight.

05-08-2008 10:00 PM

Jeff polisena
Veteran
Location: westpalmbeachflorida usa

Hotwings,
What's up ? I usually start at 40% and works for me 50% seemed to rev high coming off load

I dont know how to fly just how to not crash !!!!!

05-08-2008 10:06 PM

2 pages [ << < ( 1 ) 2 NEXT >> ]

281 views

POST REPLY

Boca Bearings	.	Modefo's RC Helicopters	.	XHELI.COM
	.		.

Radio - Servo - Gyro - Gov - Batt > gv1 inconsistent rpms

UPDATE SCREEN PRINT TOPIC

Advertisers

Subscribe to This Topic