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Aerial Photography and Video > PowerJazz program card issue
 
 
fergus
Veteran
Location: Ireland

Quote 
Fergus, i follow your theory, but what ive also noticed is if im just letting it spinn it still maintains the high rpm, thats what i tried on sunday when spooling out the entire package until it was slowing down by itself around 34v.
ONLY when i reconnect this thing happens, annoying if i have to spin for a minute first, and then reconnect everytime.

As I previously said the Powerjazz establishes headspeed based on pack voltage. If it is maintaining the high RPM until the pack is empty then gear from there (Go down a pinion if necessary). Thats it sorted.

If you are only seeing the lower headspeed after disconnecting the pack and then reconnecting again then again that is how the PJ works and is normal. When you reconnect it is reading a lower voltage and naturally as a result giving you a lower headspeed
Quote 
annoying if i have to spin for a minute first, and then reconnect everytime.
(if this is the headspeed you want to fly at then adjust your curve and or pinion to acheive it with a full pack and don't disconnect until the end of the flight)

With this done you connect a full pack and you will get your desired headspeed each time (with perhaps small variation) No governor is perfect and as I have already said it is not unusual with the Kontronik governor to see variations of 150rpm.

Quote 
ive lately started to readjust the powersupply during the charging process

Why?

I have never done this or seen it done in any of the vids or descriptions for direct charging from a powersupply posted online. I have followed the method outlined in my gallery and as shown on youtube (the vid you told me about) and never had any issues.

Regards

Fergus
08-20-2008 03:16 AM
 
 
daytonabeach
Key Veteran
Location: Oslo, Norway

Testing and testing all day, now with a smaller pinion, everything from 1250 rpm to 1550rpm on thr curve from 60% to 80%, normal mode, idle mode, doesnt matter, if i hit idle 1, it goes of course even faster, the pack starting volt are also the same every time, i refuse to believe this is normal behaviour

I mean, whats the point of having a thr curve setup if it goes totally different each time, the only thing i can say is that the rpm is very stable once its in the air, but during spool up is like the wheel of fortune, whats it gonna be know...

It seems like the issue is that hitting second gear thing is what decides if it goes wide or not, sometimes it hits second gear much harder than other times, i also believe this can damage the gear over the time, allot of stress applied to the gear can be healthy....

I guess the only thing to do is to return it for inspection and see what they could find...

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
08-30-2008 08:37 PM
HOMEPAGE  
 
 
daytonabeachKey Veteran - Location: Oslo, Norway -
THE MOMENT OF TRUTH!

I dont know whether to laugh or cry.

Got a new PowerJazz today, had two flights now, siiiiilk smooooth, rock solid on rpm.

This means ive been wasting all summer on fault finding a defect ESC, grrrr....

The good thing though is that it was that, and nothing else...

Well, i have to assume that its fixed now, even if i havent had more than two flights yet, at lest it behaves totally different *knock on wood*
Another good thing is, that now Kontronik cant deny that it is defect when returning it for inspection

Now its smooth all the way up to idle, even at very low rpms, not a second gear in sight

*puh* is all i can say right now, hope this is enough ghosts for a while



Never argue with an idiot, he'll drag you down to his level and beat you with experience...
09-12-2008 07:04 PM
HOMEPAGE  
 
 
rroback
Elite Veteran
Location: Irvine (UCI), Ca

good to hear!

Rhett... I can't fly, luckily the HC Profi Can!
09-13-2008 12:24 AM
 
 
daytonabeach
Key Veteran
Location: Oslo, Norway

A question regarding governor mode on PJ

The new PJ works fine now, but ive noticed one minor detail on the Eagletree charts;

When in normal mode (67,5% thr) the curve is rock solid, but when switching to idle 1 (70,5% thr) the rpm varies during flight upto 70-80 rpm...

Any natural reasons for that?

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
09-29-2008 06:04 PM
HOMEPAGE  
 
 
nooobs
Key Veteran
Location: Toronto, Canada

Chris

Just remembered something...

You do not need to have the heli powered on for this.

Go to your servo monitor screen and switch to IDLE 1.

Move the throttle up and down and see if the percentage changes. If it does then that where you're seeing the difference.

Adjust your throttle curve on IDLE 1.
09-30-2008 03:24 PM
HOMEPAGE  
 
 
daytonabeach
Key Veteran
Location: Oslo, Norway

Houdy!

No it doesnt, and it shall not suppose to do that either, as long as the idle 1 curve are flat... or?

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
09-30-2008 03:47 PM
HOMEPAGE  
 
 
nooobs
Key Veteran
Location: Toronto, Canada

What's your pitch curve settings for Normal and IDLE 1?
09-30-2008 03:54 PM
HOMEPAGE  
 
 
daytonabeach
Key Veteran
Location: Oslo, Norway

Normal mode 67,5% thr, idle 1 70,5% thr

Would think that it would be opposite, that the inconstancy would appear in normal mode and not idle mode...

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
09-30-2008 04:09 PM
HOMEPAGE  
 
 
nooobs
Key Veteran
Location: Toronto, Canada

Your pitch settings... not throttle.

ie:
Normal: -2 to +10
Idle 1: -5 to +10
etc...
09-30-2008 04:17 PM
HOMEPAGE  
 
 
daytonabeach
Key Veteran
Location: Oslo, Norway

Sorry, went to fast there...

pitch stick down = +47
Pitch stick up = -101 (servo monitor values)

Percentage pitch values: bottom -4.5%
top +10%

This is the same values i get in all modes, norm, idle 1, idle 2...

Is that what you meant?

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
09-30-2008 05:30 PM
HOMEPAGE  
 
 
nooobs
Key Veteran
Location: Toronto, Canada

Mmmm...

I'm going to assume you meant degrees (°) and not percentage on -4.5 and +10.

What are your head speeds for normal, idle1 and idle2?
i.e.
normal: 1200
idle 1: 1300
idle 2: 1400
etc...

Just trying to figure out your setup...
09-30-2008 05:37 PM
HOMEPAGE  
 
 
daytonabeach
Key Veteran
Location: Oslo, Norway

Hehe, im in a little hurry here you see, money in my acoount = new Sony HC9 cam, right NOW

Of course i meant degrees, not %

Normal HS 1360rpm (reduced it a bit after mounting the new RT 830 blades)
Idle 1 HS 1410rpm

Havent used idle 2 yet, but i assume around 1450rpm

Now, of to the camera store with, me, myself and my childish ego

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
09-30-2008 05:50 PM
HOMEPAGE  
 
 
nooobs
Key Veteran
Location: Toronto, Canada

Chris what "throttle curve" are you using? (Linear, Line, etc)

So did you buy anything at the candy shop?
10-01-2008 12:26 AM
HOMEPAGE  
 
 
daytonabeach
Key Veteran
Location: Oslo, Norway

Ooooh yea, got my brand new 1300$ Sony HD HC9 here
Ive challenged Canon, so they are going to lend me all the models i want to, to do side by side comparison of the different models against this Sony cam, which Derek speaks so highly of
You never know, maybe they will look into the issues CanonHD cams have, compared to Sony...
Canon also promised me to test the new Powershot SX-1 with full HD and Digic4, its all up to me, they have the beta sample in now, which they wanted to test with me one of these days, but i have to find time first, grrr, allways in that time squeeze

Anyway, in normal mode i have the linear from 0 to 67.5 and then flat out... It flatens out at -0.5 pitch
Looks something like this:



Idle 1, flat all the way from 70.5 and out..

I would assume the issue would appear in normal mode and not idle mode, what do you think?

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
10-01-2008 09:33 AM
HOMEPAGE  
 
 
daytonabeachKey Veteran - Location: Oslo, Norway -
Heres the graph from the last flight (two diff on the same graph)

First part is in idle 1, and theres where the inconstancy appears...



Never argue with an idiot, he'll drag you down to his level and beat you with experience...
10-01-2008 06:30 PM
HOMEPAGE  
 
 
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Aerial Photography and Video > PowerJazz program card issue
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