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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Throttle Jockey "REVMAX" Limiter
11-07-2004 10:14 AM  13 years agoPost 61
Colibri

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The Netherlands

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The logic when applied to the situation suggests that their should be an improvement even over a TJ with its feed forward algorithm... the TJ is always gonna lag the stick
It was my understanding that the Adaptive Feed forward Algorithm first feeds the throttle curve input to the servo and then checks if over or underspeeding is the result and deviates from the curve to correct. If this is the case than the opening of the throttle is instantaneous just as without a TJ because it will NOT wait for the RPM to drop before opening the throttle.

Tim

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11-07-2004 10:20 AM  13 years agoPost 62
Ringding

rrApprentice

Austria

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In theory it should be like that. Seems they just got it under control better with the new revmax - new software revision, more time tuning the parameters. In that case they could have even made it a "full" governor without negative effects.

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11-07-2004 10:33 AM  13 years agoPost 63
G.Man

rrProfessor

Bristol

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TVHALTER

Yes thats what the adaptive feed forward algorithm does, but how hard do you need to fly it before it allows the throttle to be completely underdamped?

With the revmax you can get more aggresive with the throttle curve and the revmax wont fight it and pulse, wheras the TJ Pro can if its a way off...

I doubt it will hold the headspeed as consistent as the TJ Pro, but it should allow the throttle to open wide way before the load requires it, that way the engine has the power before the load bogs it and it doesnt have to play catch up...

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

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11-07-2004 11:38 AM  13 years agoPost 64
Andi G

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Switzerland

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Hi,

can anybody try something for me? If I set cyclics->throttle mixes on my FF9 the servo can bind at full throttle - not nice with a digital servo.

Will the Revmax limit the servo travel towards max throttle? This alone would make it worthwhile for me...
Btw the CSM gov seems interesting too. Nice to have so many choices especially after all the GV1 sensors failing.

Andi

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11-07-2004 11:51 AM  13 years agoPost 65
Andi G

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Switzerland

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Hi,

you mean by using the internal 150% limit?

Andi

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11-07-2004 12:10 PM  13 years agoPost 66
Andi G

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Switzerland

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Hi,

yes that's what I meant, subtrim until the max throttle endpoint is at 150%...

I guess I'll wait for the CSM gov and see how they compare.

Andi

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11-07-2004 01:01 PM  13 years agoPost 67
Andi G

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Switzerland

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Lol...

well the radio can't calculate or transmit more than 150%. So you move the subtrim high enough that you will reach that limit with the given endpoints of 116% or whatever.

Believe me we mean the same thing

I haven't done this yet because I don't like the subtrims but I'll give it a try, I plan to switch back to the 60B soon anyway.

Andi

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11-07-2004 07:58 PM  13 years agoPost 68
dannny745

rrNovice

bethpage,ny

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the revmax
hey guys can anyone tell me.i have tj pro.was looking at revmax.if i put revmax on i don't need tjpro?or is the revmax just a rev limmiter.thats alot for just a limiter..i think its a tjpro and limiter..can some one tell me?thanks..

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11-07-2004 08:04 PM  13 years agoPost 69
Andi G

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Switzerland

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Hi,

Colin, thanks we were speaking of the same

RevMax is just a limiter. If you want a full gov you'll need a tj pro, gv1 or the new csm gov...

Andi

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11-07-2004 10:42 PM  13 years agoPost 70
Skillmaster

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LA cali

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i kno i fu have a govenor it stretches out your flight time by a coupke of minuts but with this rev max does it decrease your flight time? or goes it keep it stretched out like a reg gov?

1992 3000gt vr4

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11-08-2004 06:20 PM  13 years agoPost 71
armageddon

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N. Y.

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Dino was nice enough to set this up for me..

thanks,.

WHAT SIGNATURE?

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11-08-2004 08:12 PM  13 years agoPost 72
Reesy

rrKey Veteran

In the doghouse ... Nottingham UK

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OK
Just to muddy the waters..
I've followed this thread and buy the whole theory, both my GV1 powered West and TJpro powered OS50's suffer from this instantaneous bogging .. probably exacerbated by my ham fisted collective control.
Anyway if old Tosh buys it ..that's good enough for me so...
Before I rush out and buy 3 of these ..

Well there's the CSM revlock..
Read the write up in this months MHW ... didn't understand a word

So the $64 question, will the revlock have a similar function? limitless top end power allied to an overspeed function?

Russ ??

Paul

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11-08-2004 09:14 PM  13 years agoPost 73
RussD

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UK

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Hi Reesy,

The CSM Revlock is a traditional style of governor that is both 'active' and 'passive'. It looks at a combination of TX stick position and engine r.p.m to assess if changes to the throttle are required, or are likely to be required. If changes are required, then it can apply up to the full throttle limit for any TX stick position. This style of governor removes the need for accurate throttle curves and tottaly removes the need for any cyclic to throttle mixing etc.

The key to the CSM Rev-lock's rotor speed retention is that the sensor arrangement / software monitors the rotation of the crankshaft to better than 1 microsecond. So at 15000 rpm, the maximum electronic sensing deviance is just 4rpm in 4 ms. Thus when the control system can sense and react faster than the engine with no limitations to servo travel at TX stick postions, the final limiting factor to rotor speed retention is the engine. Therfore tests have showed no noted differnce between the response of the governed Rev-lock set-up in comparison to a conventional throttle curve set-up.

Hope this helps?

RussD.

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11-08-2004 11:33 PM  13 years agoPost 74
Reesy

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In the doghouse ... Nottingham UK

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Well Ade that's all well n' good
but yer missing oot on the dyson boys finest moment
in fact ...

silencio

http://www.runryder.com/t139232p1/

OK Russ
one tning here ..cos I'm crap at tuning motors, if I have the mix off a TJpro goes bananas (this on a fast servo)
will your new super hi-tech gizmo sort me out?

Paul

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11-09-2004 06:35 PM  13 years agoPost 75
RussD

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UK

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Hi Reesy,

Good results from any governor rely on a fairly good state of engine tune. The CSM rev-lock does however keep disturbances under much tighter control than previous governors and has an adjustable gain to allow for the unit to be tuned to the engine set-up.

Russ.

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11-09-2004 08:57 PM  13 years agoPost 76
Ace Dude

rrProfessor

USA

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RussD, when will the CSM unit be available?

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11-09-2004 10:00 PM  13 years agoPost 77
MJWS

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Airdrie, AB - Canada

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After all that reading and debate... seems to me the difference is simple.

Any lag by this revmax will be interpreted and felt as MORE power... We have few extra RPM on the head before it backs the throttle off a touch. That is almost always a good thing.

This seems like a very logical approach to maximizing power. For helis a little extra will always be better than waiting for servos and feedback loops to catch up.

Mike

(Anyone want a NIB TJ PRO?)

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11-09-2004 10:50 PM  13 years agoPost 78
RussD

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UK

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Hi Ace Dude,

CSM will start shipping Rev-lock to the shops within a week at a UK RRP of £44.95

RussD.

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11-11-2004 05:01 AM  13 years agoPost 79
rspiegel

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Austin,TX South Buda

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REV-max
I saw the revmax last weekend on a rappy 30 that was bone stock ya stock pipe too. I have helped this guy for one week with curves and stuff and I had it setup good I told him about this revmax and he got it installed and setup to normal=off idle1=1650 idle2=1750 throttle curev was 100,100,100,100,100 and this thing turned into a rocket; some what. But the power was over wellming differnce. I have since sold my gv-1 and bought a Revmax for my rappy 50. I can not wait to try it out. Now no more overspeeding issue's. I will still fly normal mode with the revmax off. and idle up 1,2 with it on. Does a faster servo help or not. Thanks I loved it. Richard

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11-11-2004 06:16 AM  13 years agoPost 80
TMoore

rrMaster

Cookeville, TN

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rspiegel,

When you tached the head did it hold to the rpm that you set? Since the Rev Max is only clipping the throttle to correct for overspeed do you think that it is possible that you could run a 5 point curve at 100 on all points and still fly the machine with just varying the CP and the Rev Max set to off? I do this on one Flight Mode for rolls and my Freya doesn't overspeed with the throttle maxed out all the way across.

Did you try it? My idea of using the Rev Max is to set up the throttle curves to the rpm that I want to run and then bump up the points to a value that is a little higher than the rpm set so that the Rev Max only clips during overspeed situations.

How is the way that you are using this different from using a TJ Pro? With the TJ Pro being $20 cheaper I can't see much difference in using a more expensive Rev Max if you are going max out the throttle and let the Rev Max effectively control your throttle. According to the published specs you shouldn't notice any difference in straight curves and the Rev Max except that there should be no overspeeding when the Rev Max is engaged.

TM

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Throttle Jockey "REVMAX" Limiter
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