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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Having an issue with the eCCMP upgrade on a Hawk Pro...
03-08-2008 09:51 PM  10 years agoPost 1
az_heliguy

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San Tan Valley, AZ

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I've done the eCCPM conversion on my Hawk Pro, which is also converted to a .50 (longer boom, tt, blades, gear, engine, etc) I have the eCCPM conversion on and love the connected feeling and it flys very very well. My only problem is that when i go from full - pitch to full + pitch, the swash doesnt stay level. When I am at mid-stick for zero degree pitch, it's perfectly level and when I'm at full positive or negative, it is still level. It's during the travel that one side of the servos makes the swash not level, (kinda like one of the servos is slower then the other to reach its full atv), but I know it's not one of the servos, I replaced both of them and the same thing happens. Any ides on what may be causing this or anything that I'm missing in the radio setup that could be causing this?

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03-08-2008 10:25 PM  10 years agoPost 2
SteveH

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Texas

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Not too untypical of an eCCPM setup. The initial setup is crital with eCCPM, and that is three steps. First, make sure all servo output arms are exactly perpendicular to the main shaft when at 50% of collective throw. And, to do that, you will have to use various arms to get closest, and then use subtrim on the paticular channel to get it perfect. I use a 90 degree triangle as a guage to make sure it's perfect. Second, with all the servos perfect and the radio still at 50% throw, level the swash with the links from the servos to the swash. At that time you can also adjust your links from the swash to the mixers to get 0 degrees pitch at the blades. Then third, go to full pitch, and adjust the end points of the channels as necessary to keep the swash level. Then do the same thing at full negative pitch. Then use your collective AFR to get the amount of collective pitch you want. It will never be 100% perfect in my experinces, but this procedure will get it the closest.

The government cannot give you anything without first taking it from someone else.

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03-09-2008 05:45 PM  10 years agoPost 3
az_heliguy

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San Tan Valley, AZ

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Then use your collective AFR
afr???

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03-09-2008 06:31 PM  10 years agoPost 4
SteveH

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Texas

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Percent collective swash mix.

The government cannot give you anything without first taking it from someone else.

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03-10-2008 12:56 AM  10 years agoPost 5
az_heliguy

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San Tan Valley, AZ

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ive got all that done... you know of any online tutorials on eccpm setup and radio settings? something is causing this to act this way and its okay, except for when i do any quick inputs with collective, especially in loops. it doesnt come back to the starting point, it is usually over to the left about 10-15 feet... im gonna try and add a mix to try and correct it, but dont have time to mess with it today...

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03-10-2008 06:54 PM  10 years agoPost 6
colin8

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Phoenix, AZ

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Matt,

I did a Google search and found several links to CCPM setups. Most are pretty basic, but if you spend some time searching you might find what you are looking for. Here's one that you might find interesting: http://www.curtisyoungblood.com/faqs/search.php?id=360

Good luck,
--Colin--

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03-14-2008 03:25 AM  10 years agoPost 7
Mr.Bowflex

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Toronto Canada

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I've had the same problem on ccpm helis before too. I'm certin that it comes down to the fact that the three servos move at slightly different speeds.

I have never been able to fix it with radio programing.

Perhaps you could try using "good" digital servos as they probably have better matched speeds.

Curtis

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03-14-2008 03:53 AM  10 years agoPost 8
az_heliguy

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San Tan Valley, AZ

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well i think im gonna put in some hitec 6975's, nice and fast and good torque too, but that will have to wait a month or so before they go in, lol...

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03-14-2008 04:32 AM  10 years agoPost 9
Ravenhyper50

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Canada's Capital

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I've had the same problem on ccpm helis before too. I'm certain that it comes down to the fact that the three servos move at slightly different speeds
Servo sync helps with this ccpm problem. Some of the newer radios like the DX-7 have this feature It makes sure all 3 servos move at the exact same time.

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03-14-2008 04:55 AM  10 years agoPost 10
az_heliguy

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San Tan Valley, AZ

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i thought the xp9303 had that servo thingy too, but thats in the newer ones with the updated software in it, mine doesnt have it...

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03-14-2008 07:15 PM  10 years agoPost 11
colin8

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Phoenix, AZ

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The 9303 radios have servo speed control if that would help.

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03-14-2008 07:36 PM  10 years agoPost 12
SteveH

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Texas

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I have a 9303 and I've never seen that in the menu...how do you get to it?

The government cannot give you anything without first taking it from someone else.

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03-14-2008 08:03 PM  10 years agoPost 13
az_heliguy

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San Tan Valley, AZ

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colin,

where is the servo speed setting at? i thought it was only in the newer ones

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03-14-2008 09:03 PM  10 years agoPost 14
az_heliguy

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San Tan Valley, AZ

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i was wrone, but the srv. speed setting is only in the acro mode and not in heli mode...

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03-15-2008 03:01 AM  10 years agoPost 15
colin8rrNovice - Phoenix, AZ - My Posts: All  Forum  Topic

Yes, you are right. I just checked my 9303 and the servo speed menu item in Acro mode is replaced by "Governor" in Heli mode.

I re-read your initial message where you said the swash is level at max - pitch, level at neutral and level at max + pitch. It's only during the transition that you encounter the unlevel swash situation. This can only be caused by non-linear servo travels OR a unequal linkage setup. Since you swapped servos and got the same result, a non-linear servo is probably not the problem. It still could be if both servos are equally non-linear depending on the output direction, but I'd rule that out and look carefully at your linkage arrangements.

Keep in mind that all outputs from a rotary arm are non-linear by nature. So if the angles of the linkages relative to the servo arms are not equal angles, you could have an unequal linear output. I assume you know this already, so all I'm saying is take a careful look at your linkage setup. I'm sure you will NOT find a solution to the problem you've described in the CCPM mixing functions of your transmitter.

You said "...its okay, except for when i do any quick inputs with collective, especially in loops. it doesnt come back to the starting point, it is usually over to the left about 10-15 feet..." Well, all I can say is keep practicing. With all the dynamics of tossing this huge rotating mass around in the air results in translation of 10-15 feet, I would say it's up to the pilot to compensate. I'd never expect a helicopter to remain precisely in the same location by trimming out the swashplate. Keep in mind the heli is a rapidly rotating gyroscope when flipped. Translation is a result of basic physics. Fine tuning the machine will help, but will never fully correct this problem without the pilot providing corrective inputs.

--Colin--

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03-15-2008 04:10 AM  10 years agoPost 16
az_heliguy

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San Tan Valley, AZ

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yeah... im still gonna put in the hitec 6975's and see what happens though, lol... at least with those, i can program them and get them as close as possible...

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