RunRyder RC
 1  Topic Subscribe
WATCH
 1 page 699 views
HelicopterRadio - Servo - Gyro - Gov - Batt › Throttle Jockey 8UHPS ATV Change
09-02-2003 10:07 PM  14 years agoPost 1
Ashley

rrApprentice

London UK

My Posts: All  Forum  Topic

Got a TJ fitted to a Caliber 30, sensor working well, Throttle ATV's set as close to 100-100 as possible (85-105) Ch7 ATV's set to 100-100, Gov, INH. I go through the set up procedure and all goes well - the TJ initialises ok. Then I drop the Ch7 ATV's to something like 50 - and 60, I go and test and all works well, the TJ takes control at 25% throttle and limits the Head speed through full collective range. 50 or 60% ATV's gives me a really slow head speed so I go to the ATV menu and increase the ATV up a few notches. At this stage the TJ stops working and I'm back to normal throttle control. The Green light is displayed on the TJ but it's not working on either setting. The only way I can get it to work again is to stop and reset the throttle jockey using 100 - 100% ATV's then put in another, slightly higher ATV on Ch7.
Is it not possible to change the ATV's to increase the head speed without stopping and resetting the whole thing. Or am I doing something wrong ?

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
09-03-2003 07:49 AM  14 years agoPost 2
Paul Beard

rrApprentice

Bigfork MT

My Posts: All  Forum  Topic

Ashley,
Did you install 1 or two magnets in the fan?
Paul

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-03-2003 08:51 AM  14 years agoPost 3
Ashley

rrApprentice

London UK

My Posts: All  Forum  Topic

2 magnets, but I did put them at opposite polarity - I think !

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
09-03-2003 09:46 PM  14 years agoPost 4
Tron

rrApprentice

Morgan Hill, CA

My Posts: All  Forum  Topic

Try turning your fan to line up with each magent. Only one of the magnets should cause the red led to light.

I also use TJ on a 8uhf non super with switch 7. Switch 7 is 3 positions, up, middle,and low. The middle position is like "off" as it will not engage the TJ. I get a good headspeed (estimated at 1500 rpm) at ~41% atv and it really comes alive at ~51%. I'm able to change my atv's while the heli is hovering. As I increase the % you can definitely hear the rpm pick up. I do not have to recalibrate as you have indicated.

Did you set the throttle trim all the way down when you calibrated?

Ch7 ATV's set to 100-100, Gov, INH. What does "Gov, INH" setting do? I have a non super radio so I don't have these 2 features.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-04-2003 09:17 AM  14 years agoPost 5
Ashley

rrApprentice

London UK

My Posts: All  Forum  Topic

Can't get to the heli for the next few days to check - but If both magnets are flashing the red light then all it means is you use a higher ATV - At 70%atv the head speed is really quite high - high enough to fly easily, so I'm sure at 75% ATV or so I will get the full head speed I need. This is not the problem. The problem is that I can't change the ATV whilst out in the field, it stops working and causes me to have to reset the TJ. I want to be able to slowly inch my way up from 70% - 75% not just dial it in on the bench and hope it all goes well.

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
09-04-2003 09:43 AM  14 years agoPost 6
Phil_Mart

rrVeteran

Newcastle UK

My Posts: All  Forum  Topic

If, and it is an IF, you have both magnets setting the sensor, that might well be your problem. The TJ is designed to regulate between 9500 and 20500 rpm. If your engine is at 16000 rpm and you have two magnets setting the sensor the poor old TJ is going to think its doing 32000 rpm. This is a tad outside its control range!

PM  EMAIL  GALLERY  Attn:RR  Quote
09-04-2003 09:50 AM  14 years agoPost 7
Ashley

rrApprentice

London UK

My Posts: All  Forum  Topic

Well that makes perfect sense - I will check in a couple of days when I am reunited with my heli.

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
09-13-2003 12:11 AM  14 years agoPost 8
Ashley

rrApprentice

London UK

My Posts: All  Forum  Topic

Sorry for the delay, took longer until my next flight than I expected. Removed one magnet and now all works perfectly well - Thanks for all your help. The throttle jockey is doing it's stuff.

The only thing now is that the TJ only kicks in when it reaches a head speed similar to that which I want it to keep, but sometimes I don't normally achieve this head speed on the ground, so I activate the TJ but it doesn't take control until after take off. I guess that on my machine the TJ pick up RPM point is too close to the Head speed I want !
Any more Ideas ?

I have to say that the TJ is stopping the head speed from screaming up on decent of the Heli - which is exactly why I got it, so no criticism of it, and also if I had put just one magnet in everything would have been easy as anything from the start.

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
09-13-2003 01:39 AM  14 years agoPost 9
Tron

rrApprentice

Morgan Hill, CA

My Posts: All  Forum  Topic

if your tj is properly calibrated and enabled (ATV > 5%) it should take over the throttle once the throttle stick is raised to a position corresponding to 25% (throttle curve percentage).

If your are running a linear throttle curve (0, 25, 50, 75, 100%), then the tj's green light should come on when you reach 1/4 throttle stick.

oh, the last criteria is that the engine has reached the target speed for more than 1 second. I think this is the hold up.

Try increasing your throttle curve so that you get the target headspeed while on the ground.

I personally enable the tj once I'm airborne so I've not experienced this.

My weekend is just beginning so I'll check out my ideas tomorrow!

PM  EMAIL  GALLERY  Attn:RR  Quote
09-13-2003 08:19 AM  14 years agoPost 10
Phil_Mart

rrVeteran

Newcastle UK

My Posts: All  Forum  Topic

There seems to be, possibly, a missunderstanding of the TJ operation here. The TJ will 'enable' at 25% throttle but, will not take over control untill you have reached the desired, set, head speed. I've set up my idle 1 throttle curve so that the throttle is open enough to get me up to head speed with the pitch still at 0 degrees, thus the TJ takes over with no nasty little 'jumps' from the heli

PM  EMAIL  GALLERY  Attn:RR  Quote
09-13-2003 10:08 AM  14 years agoPost 11
Ashley

rrApprentice

London UK

My Posts: All  Forum  Topic

You must be right as this is exactly what it's doing. I just thought that when I flick the switch it would have taken it up to that rpm if I was above 25% throttle. So my mistake again !
I will tweek the hover throttle pot to increase the head speed a little. This way, like you said, the TJ will take over on the ground, which for me is a little more reasuring.

Thanks

PM  EMAIL  HOMEPAGE  Attn:RR  Quote
09-17-2003 05:12 PM  14 years agoPost 12
Tron

rrApprentice

Morgan Hill, CA

My Posts: All  Forum  Topic

Well looks like we are all sorted out. I did test the theory and as previously stated, you have to reach target rpm before the TJ kicks in.

Additionally, I noticed that my mounting bolts were becoming loose. I think it has to do with the wider bolt slots on the mount not giving the cap head enough surface to really compress down. I'm going to reinstall with a washer to evenly disperse the pressure so I can really tighten the bolts. I'm using the larger mounting bracket on a raptor 50v2 with TT50 engine.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 699 views
HelicopterRadio - Servo - Gyro - Gov - Batt › Throttle Jockey 8UHPS ATV Change
 Print TOPIC  Make Suggestion 

 1  Topic Subscribe

Saturday, December 16 - 3:06 pm - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online