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HelicopterRadio - Servo - Gyro - Gov - Batt › Review of my new CSM RevLock governor -- first flights
12-06-2004 06:29 AM  13 years agoPost 1
xtremercprods

rrNovice

Honolulu, HI

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I bought a CSM RevLock governor this week to give it a try on my Freya 91 with OS 91 C-Spec PS. Prior to installing the CSM RevLock, I had a Futaba GV-1 on the machine. The throttle servo I am using is a JR 8231 standard digital servo.

I have never owned a Throttle Jockey so I cannot make any comparisons to that. I pay for all my heli equipment. This is my personal opinion on the product and wanted to contribute my ideas since there has been some talk about it recently.

Installing the CSM RevLock was effortless. I glued to magnet onto the preset hole on the Freya fan and bolted on the sensor. The only adjustment I needed to make was setting the 1-2 mm gap between the sensor and the magnet. I was impressed by how small the sensor was and how easy it was to put onto the mounting bracket -- you just need to heat up the adhesive heat shrink tubing.

Configuring the RevLock was also easy to do with the LEDs on the unit. You have two RPM settings that you can set. I tied mine to the flight mode switch between normal and idle-up. With each flight mode, you just need to set the LEDs to match the desired RPM. Complete operation testing can be done on the bench since there are LEDs that show what RPM mode is being used, what the set RPM is, and whether or not the governor will be activated when you move the trottle up/down. All the important parameters that could be set with the Futaba GV-1 LCD can be seen on the RevLock LEDs. I suppose one advantage over the Throttle Jockey is that you can see the RPM you want on the unit versus not being able to on the TJ.

After I set everything up on the bench, I did some subjective flight tests with it. I had the normal RPM set to 13750 and idle-up RPM set to 14500. Using an optical tach, I tested both modes and the RPM was dead on during hover -- ~1730 on normal and ~1830 on stunt.

I put the Freya 91 through "my" paces and the unit worked great. The RPM seemed exceptionally consistent while I did continuous tumbles (effortless), continous rolls, tick-tocks, piroutting flips, and just flying around. Pumping the collective up and down also performed very well with no noticable power loss or RPM change. One thing I noticed before with my GV-1 was that during quick drops, it had a tendency to overspeed with my helicopter. With the RevLock, it was not doing this at all.

All in all, I am very impressed with the RevLock and am quite happy with it. Although I just flew it for a day, I think the helicopter definitely feels better and ran smoother than when I had the GV-1 on it. The only "negative" about the product so far is that it doesn't come in a case but rather a PC board with a plastic covering -- not that durable looking but since it is mounted with tape inside the battery tray area it shouldn't be a problem. On the plus side, the unit adds almost no weight to the heli.

Prior to this, my only other CSM product I owned was the CSM 360 which I thought was revolutionary back then. After the CSM 540 came out and how I saw how so many people had problems with it (no one I knew could set it up correctly), I never bought another CSM product. This new product definitely is worth a look if you want a good governor though. I would say that in my opinion, the price+performance is better than a GV-1 (I have 2 GV-1s and both have half-broken LCD screens over time/crashing).

bob

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12-06-2004 01:17 PM  13 years agoPost 2
z11355

rrMaster

New England

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Configuring the RevLock was also easy to do with the LEDs on the unit. You have two RPM settings that you can set.
You can actually have as many RPM settings
as you want within the 'range' depending on how
(and which brand/model) you setup the
transmitter. Using the 9Z w/ offset mixing to
control it, you can get as many speeds as you
have flight modes/conditions.

If the Freya had a GV1 magnet, I dont understand
why'd you bother to remove and reinstall the
CSM magnet. it's all the same.

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12-06-2004 03:40 PM  13 years agoPost 3
xtremercprods

rrNovice

Honolulu, HI

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Yes, that would make sense that you could have multiple speeds within the RPM range by having different offset values controlled by different ATVs/mixing. I guess in the practical sense, two is enough for most people though so good enough.

I put on the magnet since my GV-1 sensor broke a long time ago and I was using the optical sensor for the GV-1 well before I got the Freya.

bob

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12-06-2004 09:20 PM  13 years agoPost 4
Dr.Phil

rrApprentice

Oslo, Norway

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Nice review, Bob!!
I've ordered my Revlock yesterday. Can't wait to try it out!


Philip
Rave ENV, Stratus BW,Trex700 V-bar,Furion450
www.airheads.no,Team Hobby24

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12-21-2004 02:53 AM  13 years agoPost 5
Tenrail

rrApprentice

Mesa AZ

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Hey bob! Very inspirational, mines on the way and i cant frickin wait. -danny

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12-21-2004 08:13 AM  13 years agoPost 6
Paul Woodcock

rrElite Veteran

Dubai - United Arab Emirates

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I have had 8 flights with one on my R50.

I had some problems with it hunting on the throttle when descending fast. This happened in hover mode and idle1. I turned the sensitivity all the way down, but still not perfect.....Then I read the instructions again.....75 % atv on my throttle and the instructins call for 85 to 115 % as a limit. I put a shorter servo arm on and set 100% atv and tried again. Much better......so read the instructions

This thing works very well. I am running a mp2 and an os50 motor and they all work well together.

Paul

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12-21-2004 02:10 PM  13 years agoPost 7
Knud Pedersen

rrKey Veteran

Denmark - Europe

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xtremercprods

I have a Fury Extreme with:
- Revlock / S9252
- OS91PS / MP2 / Wildcat10%/ / “Return Needle set”
- GY601

I have hunting problems in Norm and a little in Idleup1, nothing in idleup2.
I have been told to make throttle servo offset (as described in the instruction), and reduce the revlock response from 50% to aprox. 25%.

Have do the above modifications – but haven’t try it yet……….

Also been told that adding sims under the cylinderhead, can give a more smooth running engine….
I wonder: do you have do any specific thing not to have hunting problems????

ChopperKnud
Team Miniature Aircraft
ThePitchbrothers

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12-22-2004 05:55 AM  13 years agoPost 8
Dusty

rrApprentice

Edmonton, Alberta - Canada

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I'm wondering about one thing before I order mine.

What kind of servo does a guy need... fast digital, or what ever I have laying around?

Thanks
Shawn

Canada Shawn

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12-22-2004 09:11 AM  13 years agoPost 9
ShuttleSmasher

rrApprentice

Owner of TheModelWorx.co.uk

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A 3001 will do fine for the Rev Lock, it works well with most cheap servo's. There is no need to spend for this one.

Gary

Team Dyna-X

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12-22-2004 09:11 AM  13 years agoPost 10
xtremercprods

rrNovice

Honolulu, HI

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I am using a basic JR 8231 digital servo and it works fine. I would use a regular digital servo like that first to try out.

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12-22-2004 12:09 PM  13 years agoPost 11
nivlek

rrProfessor

Norfolk England

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Knud,
Before you add any shims under the head, check out this link.
http://www.rcboat.com/cr.htm

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12-22-2004 01:03 PM  13 years agoPost 12
Dusty

rrApprentice

Edmonton, Alberta - Canada

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Looks like a pretty good product... I think I'll order mine today!

LOL ... I sound like a commercial!

Thanks all.
Shawn

Canada Shawn

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12-22-2004 02:09 PM  13 years agoPost 13
ShuttleSmasher

rrApprentice

Owner of TheModelWorx.co.uk

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Knud,,,

As people are talking engines here I will mention it again, You really should be using more nitro in the engine, don't go messing with shims. It doesn’t need it, use better fuel the C-spec will be happy.

Dusty
You can run most servos on the Rev Lock; I use a JR 810g that was only because I had one lying around doing nothing.

Gary

Team Dyna-X

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12-22-2004 02:45 PM  13 years agoPost 14
Knud Pedersen

rrKey Veteran

Denmark - Europe

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ShuttleSmasher

mhhh - maybe I should start to listen the yours and others advice about the feul…..

think I would ordre 2 gallone of Coolpower 20%.....and try it before the sims.......and the cats eye

My Danish supplier don´t have 20% wildcat………

.

ChopperKnud
Team Miniature Aircraft
ThePitchbrothers

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12-22-2004 03:09 PM  13 years agoPost 15
ShuttleSmasher

rrApprentice

Owner of TheModelWorx.co.uk

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If you can get 30% then try that , you will love it.

Gary

Team Dyna-X

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12-22-2004 03:12 PM  13 years agoPost 16
steve9534

rrKey Veteran

yakima, wa.

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Knud

Interesting article in the link nivlek has posted. The absolute limit for how small a squish clearance one can use is dependent on the pressures generated between the piston and squish band on the head. If the squish band clearance is too small the local pressure under the squish band will increase to the point that the motor predetonates. The forces on the rod, wrist pin, crank pin, bearings, and piston all increase exponentially, too so that you may run into a situation in which the structural strength of the individual components is exceeded before you reach an optimal clearance for best power. OS engines are designed relatively conservatively so that the stock squish clearance is probably already greater than optimum. If you want to lower the compression ratio, you'd be better off taking some material out of the "bowl" portion of the head rather than add shims. I can say, having tried it both ways on other motors, that neither works very well, and if you're motor isn't running smoothly, shimming the head most likely won't cure it. I have no specific experience with the OS 91 motors. Hope this helps. steve.

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12-22-2004 06:27 PM  13 years agoPost 17
Reesy

rrKey Veteran

In the doghouse ... Nottingham UK

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My guess is to second that, I've got a shim in my PS from the summer when I was trying new fuels and was pointed to the "benefits"
My gut feeling so far is the revlock is much more sensitive to a poorly tuned engine than say a GV1 or TJpro (both of which have done service and worked OK) There might also be an issue with the MP2 and 1/4 wavelenghts.
One option is higher nitro to widen the sweet spot or a different HS to move the wave out of band.

I certainly suspect the shim is NOT the way to go until someone proves otherwise

just my 2 ha'porth

Paul

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12-22-2004 06:55 PM  13 years agoPost 18
G.Man

rrProfessor

Bristol

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The revlock has been extensively tested with a poorly tuned motor..

All you have to do is reduce the gain and it will lock, but better to tune the motor...

If you have had the revlock running fine and it then goes wonky its a good sign its time to retune your needles.. not a bad thing IMHO

Don't Email me as I wont reply - PM Only (spam countermeasures)

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12-22-2004 07:10 PM  13 years agoPost 19
Reesy

rrKey Veteran

In the doghouse ... Nottingham UK

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Bob
What nitro are you running, what are your needle settings and plug?

Mark
If reducing the sensitivity doesn't work is there a way of interpreting tail hunting? I know Knud has suffered from this but unfortunately the discussion got sidetracked and degenerated rather quickly

I'm moving mine to my OS50/KSJ muffler 30% Rap50 for now until a sensible discussion has sorted out these details

Many thanks for any input

Paul

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12-22-2004 07:16 PM  13 years agoPost 20
xtremercprods

rrNovice

Honolulu, HI

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reesy,

I am using Enya #3 with 30% wildcat. The needs are probably around 1 1/2 turns on the main and almost all out on the low end.

bob

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HelicopterRadio - Servo - Gyro - Gov - Batt › Review of my new CSM RevLock governor -- first flights
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