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Tandem Rotor Helis Vertol Chinook > Hirobo Chinook pitch range
 
 
michaelf
Heliman
Location: Adelaide, South Australia, Australia

My Posts This: Topic  Forum
I am having trouble achieving the recommended pitch range on my E-con Hirobo Chinook.
I have the linkages positioned 10mm out from the centre of the servos and all linkages are square to each other at 50% stick. The transmitter “Travel adjust” is set to H140% and L150% as recommended and the settings on the TR-SVMIX are as per instructions.
The maximum pitch range I can achieve is -9 deg to +5 deg. I need another +8 deg.
When I look at the recommended pitch curve settings for my transmitter (JR PCM9X2), NORM =L8, mid 50 and H85, they are nothing like what I have, mine are L46 (-2) to H100 (+5).
I have tried changing the “Travel adjust” on the Tx to its maximum (H150) but can only gain another 1 deg.
I have also looked at the FP OUT and RP OUT but that made no difference to the pitch range.
At the moment I am at a loss as to know what to do, everything seems to be setup correctly, the only thing I can think of is to change the pivot position of the servo arms, but I should be able to get the required pitch travel with the setup as per the instruction manual.
The servos are JR DS8325’s and I’m using a Spectrum 9 channel receiver.
I hope some of you experienced guys can set me straight.
Michael
06-23-2009 07:42 AM
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michael f
Heliman
Location: Adelaide - South Australia

My Posts This: Topic  Forum
Thanks guys, I know you’re probably racking your brains trying to help me with this problem.
Anyway I’ve come up with a part solution by extending the rotor head linkage rods beyond the recommended lengths shown in the instruction manual. This extends my pitch range but still doesn’t give me the full range that's required.
Michael
06-23-2009 11:58 PM
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Helitronix
Senior Heliman
Location: Marlborough, MA - USA

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Plug a servo into the RX directly, without using the Hirobo mixer. Verify that you are getting full travel from the servo. If not, then you need to adjust your transmitter settings. If you do get full travel, then you might need to adjust your Hirobo mixer settings.

If you find that you don't get full travel when directly connecting the servo to your RX, consider making a new 'model setup' in your TX and starting over. Use all defaults, and verify that you get full travel with default settings (or with full ATV at least, but leaving everything else alone). You may have made an adjustment to your TX settings that is altering the final output of the servo (perhaps a mix that you left in there yourself?)

That said, are you sure you need such a large pitch range? I don't have the Hirobo tandem, but it seems to me that -2 to +9 would be a more typical range, not -9 to +13 (unless you plan to 3D it?) If the -2 to +9 range is more what you wanted, then you have adequate pitch travel already, and actually need to reduce it from where you are now.

Joel-
06-24-2009 04:46 AM
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michael f
Heliman
Location: Adelaide - South Australia

My Posts This: Topic  Forum
Thanks Joel, you are right, I don’t need -9 to + 13, I was just stating that the measured range I had was -9 to +5. The Hirobo recommendation is -4 to +13 in throttle hold; anyway by readjusting linkages I am now able to achieve -3 to +12 which should be sufficient.
I have been through and checked everything as you suggested, and all seems to be OK, I thought that there must be some adjustment in the Hirobo TR-SVMIX unit that I wasn’t aware of.
Michael
06-24-2009 06:12 AM
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avconslt
Senior Heliman
Location: Houston, Texas

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Michael,

You might want to make sure that you have one less degree of negative pitch on the front rotor to allow the nose to come off the ground first to a level attitude before the back comes off! Correct me if I am wrong guys, but that is how most of us are setting up the pitch!

Richard

o
06-24-2009 10:56 PM
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doorman
Elite Veteran
Location: E.Berne, NY

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Sounds Like Your Winning!!!!!!

Joel has you pointed in the right direction with the required pitch settings and it sounds as if you have them corrected now....
And I also agree with avconslt.... I am running about 1/2 to 1 degree more positive in the forward head.... just try some small easy hovers to get this part correct..... and you will still need to keep a little forward pressure on the elevator in forward flight to help keep the nose under control!!!!!

Good Luck.... Stan

Team Hirobo/MRC --- RCLIGHTS.NET ----- If there is a cure for this, please don't tell me about
06-25-2009 08:55 PM
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michael f
Heliman
Location: Adelaide - South Australia

My Posts This: Topic  Forum
Thanks guys, will try your recommendations. Has anybody tried altering the FP OUT and RP OUT on the TR-SVMIX to see what it actually happens?
I did have the machine hovering and moving about a little quite well, but for some reason things went a bit haywire, all it wanted to do was head to the left rear toward the ground, finished up with a couple of heavy landings but no serious damage, so I thought I had better pull the body off and go through all the setups and start from scratch again.
Thanks all, for your help.
Michael
06-25-2009 11:59 PM
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doorman
Elite Veteran
Location: E.Berne, NY

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I have not had to change anything other then the gyro gains..
Did you check to see If.one of your followers slipped??
Also watch the bolts thatt hold the heads down.. They can come. Loose and give some very strange flying!!! "Ask me how I know this one!!!!
What servos and equipment are you running??
Actually it sounds as if your elev gyro gain is too high.. Take it down 10 points on your next try....
Stan

Team Hirobo/MRC --- RCLIGHTS.NET ----- If there is a cure for this, please don't tell me about
06-26-2009 01:14 AM
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michael f
Heliman
Location: Adelaide - South Australia

My Posts This: Topic  Forum
Stan, the servos are JR DS8325’s and the Rx is a Spektrum 2.4G. As I said I've gone through everything, checked and reset the phasing and pitch travel, I found nothing loose. I’ll try it again when we get some decent weather and if it’s no better will try reducing the elev gyro gain.
Michael
06-26-2009 01:58 AM
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doorman
Elite Veteran
Location: E.Berne, NY

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Looking Forward To Hearing....

Sorry about the servo question.... I was on my BB and did not go back far enough to see that info.....
Let me know if I can help you out.... send me your phone number and a good time to call, and I will be glad to try and help you sort it out....

Stan

Team Hirobo/MRC --- RCLIGHTS.NET ----- If there is a cure for this, please don't tell me about
06-26-2009 03:19 AM
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michael f
Heliman
Location: Adelaide - South Australia

My Posts This: Topic  Forum
Thanks for your kind offer Stan; have it all back together now and have re-tracked the blades, everything seems to be working OK at the moment, lifted it off the ground slightly, just not enough room to hover it around. Will let you know how it goes the next time I take it out.
Michael
06-26-2009 07:01 AM
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Tandem Rotor Helis Vertol Chinook > Hirobo Chinook pitch range
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