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Radio - JR & Spektrum DSM > AR7100R with YS 91SR
 
 
creightoncarr
Veteran
Location: Missouri City, Texas - USA

Has anyone got the backplate sensor to work with a YS 91SR? When I turn the crank by hand it seems to sense the crank pin twice each time it goes by. When I activate the limiter in flight it does not function and goes straight the the throttle curves (yes, my throttle curves are higher than the set rpm limit). I can set the throttle curves to 100%, the limiter to 10% in the governor menu and I'll still get 100% throttle with the limiter activated. At first I thought the limiter in the receiver wasn't working so I installed a separate RevMax unit and connected the backplate sensor to it. Same thing, the RevMax would not work. So, it seems it's either a problem with the sensor or the sensor does not work with the YS 91SR. The sensor does appear to function as it does sense metal objects as they pass by, just odd that it seems to sense the crank pin twice - I'm assuming this is what's causing the problem. I guess the next step is to install a traditional sensor and magnet and connect that to the AR7100R to make sure the limiter portion is actually working.
06-16-2008 02:39 AM
 
 
creightoncarr
Veteran
Location: Missouri City, Texas - USA

An update on using the backplate sensor on the YS91SR:

After attaching the sensor to the bracket in the .50-sized mounting hole and giving myself about a 1/3 cm gap between the backplate and the sensor (the manual says that the sensor should touch the backplate) it appears to be functioning properly now. I put four tanks on the Aurora this afternoon and the limiter locked right in. I was worried that the signal might be too weak with the sensor so far away. I was running 100% throttle curves and no problems with overspeeding even when really unloading the head. Attached is a pic showing the gap between the sensor and the backplate. Any closer than this and it would not work right.
06-17-2008 11:38 PM
 
 
fly boy 1
Senior Heliman
Location: Milwaukee,WI

Cool, I noticed this too with my Aurora, it would go on then off then quickly back on in the same turn. Good find, I'll do the same.
Eric

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06-18-2008 02:23 AM
 
 
fly boy 1
Senior Heliman
Location: Milwaukee,WI

So, I switched over to the 50 mounting position, and it does seem like its working better. One thing that I noticed however was that if you rotate the engine slowly by hand sometimes it seems to sense the crankpin for almost the entire rotation and then quickly turns of then back on. If i spin it over slightly faster it seems to go away though. Any ideas on this from Mr. Beard?
Eric

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06-18-2008 03:44 AM
 
 
creightoncarr
Veteran
Location: Missouri City, Texas - USA

Yeah, mine gets stuck in the "on" position sometimes as well when I turn the crank very slowly. It functions normally during flight though which is all I really care about.
06-18-2008 04:14 AM
 
 
fly boy 1
Senior Heliman
Location: Milwaukee,WI

Yeah, I figured it would. I'm gonna test mine tomorrow afternoon and see if it fixed it. Nice video with your aurora BTW looked great.
Eric Brandenburg

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06-18-2008 04:15 AM
 
 
creightoncarr
Veteran
Location: Missouri City, Texas - USA

Thanks. Hope your sensor works for you. Surely Spektrum tested this thing with the YS engine. They really need to update the manual to let people know how to get this to work with this engine. Adjusting it to touch the backplate like the manual specifies only seems to work with the OS engine.
06-18-2008 04:20 AM
 
 
fly boy 1
Senior Heliman
Location: Milwaukee,WI

I wonder what exactly the sensor see's twice with this motor? Maybe some sort of material difference between the os causes it?

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06-18-2008 04:23 AM
 
 
creightoncarr
Veteran
Location: Missouri City, Texas - USA

My thought is this: The crank pin on the OS 91 is 7mm in diameter and the crank pin on the 0s50 is 6mm in diameter. The crank pin on the YS91SR, however, is 8mm in diameter. I think that the sensor is calibrated to detect a certain change in the magnetic field around it when the smaller crank pins pass by. When the larger crank pin passes by maybe the disruption is greater than expected.
06-18-2008 04:33 AM
 
 
fly boy 1
Senior Heliman
Location: Milwaukee,WI

That makes sense, looking forward to trying it out tomorrow. On your aurora what headspeed did you like, and what were the percentages in the radio? I'm running exactly the same set up.
Eric

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06-18-2008 04:41 AM
 
 
creightoncarr
Veteran
Location: Missouri City, Texas - USA

I'm running 1850 on the head in idle2. My throttle ATV's are +108 and -110%. 65% in the governor menu on the 12X gives me 1770 and 72% gives me 1850. As long as your throttle ATV's are in that ballpark I would assume that those percentages will give you close to the same headspeeds.
06-18-2008 05:02 AM
 
 
fly boy 1
Senior Heliman
Location: Milwaukee,WI

Cool thanks, that gives me a good idea of where I should end up.

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06-18-2008 05:10 AM
 
 
Paul Beard
Senior Heliman
Location: San Jose CA

The sensor works perfectly on the YS91 SR.

Make sure that the sensor face touches the back plate with no gap.

Rotate the engine a few revs so that it can 'learn'. The SENS LED should toggle correctly after a few revs.

Paul
06-18-2008 08:24 PM
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creightoncarr
Veteran
Location: Missouri City, Texas - USA

I cannot comment on other YS 9SR's, but touching the backplate the sensors do not work with my engine. I've tried two sensors and no matter how many times I turn the crank, they always sense the crank pin twice when it passes by if the sensors are touching the backplate. I even tried moving the sensors to all four positions around the backplate. When the limiter is activated with the sensors touching the backplate, it does not work (that's with two different sensors and two different receivers [on the same engine]). When I pull the sensor away from the backplate it works perfectly and the limiter functions as expected.

They may work on other's YS engines when they touch the backplate, but I can state without doubt that the two sensors I have will not work properly on the engine in my Aurora if they are touching the backplate.

My only point is this, if it works for you touching the backplate, then fine. But, if you, like me, find that it doesn't work that way, try leaving about a 1/4 cm gap between the sensor and the backplate. It may or may not work for you, but it is the only way either of the two sensors I have will work properly with this particular engine.
06-18-2008 08:37 PM
 
 
fly boy 1
Senior Heliman
Location: Milwaukee,WI

Well, after testing it today, it works! The gap worked for me too. I guess it might be a case by case basis, but it's an option for those that may have trouble. I ended up with my endpoints being similar to creightoncarr's.
Eric

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06-19-2008 02:56 AM
 
 
creightoncarr
Veteran
Location: Missouri City, Texas - USA

Glad it worked for you. I have yet to find anyone who has been able to get it to work without the gap on the YS. I guess we'll see if Finless gets it to work on his Aurora build - I think he's using the YS engine in that one as well.
06-19-2008 04:19 AM
 
 
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Radio - JR & Spektrum DSM > AR7100R with YS 91SR
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