CSM Revlock 10 hunting RPM

[Tripler]

I agree but it does because the mp2 held the torque so well i.e semi governing and the revlock being so active they tend to get upset with each other especially if the mixture isn't spot on.
If you use a lazy governor TJ or GV1 the mixtures not so critical but they don't hold rpm like a revlock

I see,, so should CSM advise you to buy another pipe to get the best out of their product?
Not getting at you 3Dbasher, and I know you know what your talking about but this is a problem I've come across many times in this hobby,
manufactures sometimes give high expectations and ratings for their products in the sales pitch without explaining you need to alter or up grade to achieve it,
This can become very annoying to a novice.

Its a good job there are forums like this, its saved me money and hassel over the years and should be recommended to anyone buying a heli imo

[3dbasher]

I see,, so should CSM advise you to buy another pipe to get the best out of their product?
Not getting at you 3Dbasher, and I know you know what your talking about but this is a problem I've come across many times in this hobby,
manufactures sometimes give high expectations and ratings for their products in the sales pitch without explaining you need to alter or up grade to achieve it,
This can become very annoying to a novice.

Its a good job there are forums like this, its saved me money and hassel over the years and should be recommended to anyone buying a heli imo

the rl10 is old stock in most places now the 20 and 30 don't suffer with any hunting issues if setup correctly.. having said that i was using rl10 to great success pre sponsorship
i could lie to you if ya want me too though

[Andy from Sandy]

Do you know how much they charge if they are able to update the software Andy?
Martin

No I don't know. Just give them a call. Typically for checkups they only charge the return postage so to do the upgrade shouldn't cost very much at all and I would expect it to be less than purchasing a RL20.

[moyesboy]

The linearity of the response of the engines is very inconsistent and dependant on pipe, mixture and fuel type.
A governor with a slow response will control reasonably well through a range of throttle responses. However it will fail to keep up in a rapid descent and you will get some overspeeding.
This is exactly what I get with my Align governor - though it is cetainly good enough not to cause any problems no matter how I slam the heli about. I can just hear the speed go up a little when the motor is suddenly off loaded than I can with my SL20/Hyper on my knight. fitting a faster more accurate servo din't change anything.

There is usually no problem wirth the response to increase load provided you use a reasonabe throttle curve and not a flat line. The active governors read the throttle channel and sends that feedworward through to throttle servo in anticipation. The opening of the throttle is automatic when you hit the collective. Then the governor just has to send a small correction to keep the rpm exactly right.

The motor in my knight tends to be rich at mid throttle and I had probs with the RL20 hunting at 1700 head speed while working fine at 2050. Turning the sensitivity down to correct the low head speed hunting means I now have a bit of overspeeding when I off load at 2050. In short I tuned the RL20 so it now behaves like the align governor.
I think in the PC setup features it might be possible to set the sensitivity different for the different speed ranges.

With a highly tuned pipe you will have a peaky throttle response where the power is concentrated at the tuned frequency. That makes it a lot more difficult for the governor. The modern pipes work much better over a wider range of speeds.

[DIJ]

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[DIJ]

I had the same hunting issues with my RL20 and 50 hyper with a standard pipe on a Raptor 50. I talked to CSM who were very helpful and they suggested a few things….

Upping the nitro content (I have not tried this yet)

Faster throttle servo (I did this and it helped a little)

Starting with the sense pot fully down and slowly increasing it (helped a little, but did not cure the problem)

Offsetting the throttle linkage so the throttle moves slower near the closed position, using ATV values between 85%-115% (I have not tried this, but a friend did this when he had the issue and reckons it cured it)

I bought the PC cable/software and reduced the integral gain to 25 and this gave the best result overall, and my sense pot ended up being around halfway.

I don’t think the RL10 has the PC interface, but maybe the throttle offset fix may work for you

[Predbasher]

Tried adjusting the sensitivity screw. Worked ok for a brief time at the higher RPM values (around 2100) but a lower (1700) it hunted badly. I say a brief time because after finding a good gain for the higher setting, I then adjusted gain for the lower RPM but never found a good setting for both. Now I can't get a good setting for either again! It seems likely that there may be an issue of engine mixture, changes as engine warms up. Either way the governor seems exceedingly sensitive and I can see I would be tweaking the gain each time I fly. At the moment I tend to just inhibit the governor as I'm getting far better results without it.

I've e-mailed CSM, I'll wait and see what suggestions they have.

[Tripler]

Predbasher,
Exactly the same for me, stuck the old GV-1 on no problems, the experts here seem to to get them running ok but for me they’re a bit to fiddly.
Just want to fly without having to adjust it every time.

[DIJ]

Tried adjusting the sensitivity screw. Worked ok for a brief time at the higher RPM values (around 2100) but a lower (1700) it hunted badly. I say a brief time because after finding a good gain for the higher setting, I then adjusted gain for the lower RPM but never found a good setting for both. Now I can't get a good setting for either again! It seems likely that there may be an issue of engine mixture, changes as engine warms up. Either way the governor seems exceedingly sensitive and I can see I would be tweaking the gain each time I fly. At the moment I tend to just inhibit the governor as I'm getting far better results without it.

I've e-mailed CSM, I'll wait and see what suggestions they have.

Sorry, I forgot to mention I still can't get the governor to stop hunting at lower head speeds, but it now works ok at around 1900 rpm.

I was also going to set a low governed head speed, but when I thought about it I realized that I fly mostly in idle up anyway, and also that it would probably be best to run normal mode ungoverned, so I can see if I have any engine problems, as they tend to be masked by a governor.

So my set up now is take off in normal mode and then hit idle up which also turns on the governor. Just my preference of course.

Lastly, when I emailed CSM I received a reply from the receptionist, which did not help much, I then phoned and spoke to one of the designers (sorry, but can’t recall his name at the moment) who was very helpful and took the time to go through all the possible cures. So if the email you receive back does not help then give them a call.

[moyesboy]

There's only a few of them at CSM, its round the back of the local shop just outside Royston Vasey near Glossop

[Tripler]

Lol long way to walk for a pint of milk if you live here

[Predbasher]

Nice location, its crying out for a bit of slope soaring action!

DIJ, was thinking of doing the same, inhibit normal mode and concentrate on getting a good setting for idle up. More trials required I think - its costing me a fortune in fuel getting this bloody governor to work! If no joy I might look at other makes - I'm sure CSM governors do work really well but I am concious of the fact that the RL10 is one of the early models. Is it right that you need an 8 channel radio to use a GV-1? - sure I read it somewhere. If so I'm a bit stuck as I only have 7. Any other recommendations?

[Andy from Sandy]

It was mentioned in earlier posts that the RL10 has issues with engines hunting. You were advised that the RL20 might fix the problem and you can get CSM to do a software upgrade.

If you have no luck with the RevLock then I can highly recommend the Aerospire MultiGov. It also does not require a tacho in order to set the headspeed. Someone on here did a review and found it to work very well.

[DIJ]

Not sure about the GV-1, but I know I am happy just using the govenor just in idle up.