SJGD help - HeliFreak
Fun, Learning, Friendship and Mutual Respect START  HERE

Go Back   HeliFreak > R/C Electronics Support > Flybarless Helicopter Systems

Flybarless Helicopter Systems CSM Cyclock, Helitronix Multi-mixer, Spartan AP2000i, Firmtronix Digimix-3, Gyrobot, SK360and AC3X

LinkBack Thread Tools Display Modes
Old 07-26-2010, 06:12 PM   #1 (permalink)
Registered Users
My HF Map location
Join Date: Mar 2010
Location: USA, Indiana, Indianapolis
Default SJGD help

I am assisting a friend with his four bladed project heli. We have dealt with HeliCommand Rigid on previous 4 blade projects but thought we'd try the SJGD unit on this one, mostly due to cost of SJGD versus the HC.
I've got it all set up and it is flying but not very well. Our initial test was done with some plywood skids and basic pod and boom set up. It seemed to do fairly well in that configuration. We took the mechanics and installed them in a fiberglass fuse for final fitting and flight testing before putting the finish on the body.
In the body, it didn't fly well. Admittedly, fully rigged it tipped the scales at just over 20lbs versus the test rig at just under 11lbs. My biggest concern is the cyclic control. It will from time to time, "shudder" for a few seconds and then settle back down. It does this in both roll and elevator, not necessarily both together or separately. I am thinking this may be vibration getting to the sensor but not sure. Nothing on the heli shakes for the most part but it is so heavily built it can't shake. I have ran the gain as low as 10 on both aileron and elevator and as high as 60. 10-20 range is better but not drastically. It just shakes a bit more violently with the higher gain.
The tail is having issues as well but we are thinking that the tail disc just doesn't have sufficient authority to control the tail. We are going to hang a Gy401 on it just for a quick test as I am plenty familiar with them to know if we have a mechanical problem ( disc too small, blades too slow) or set-up issues with the SJGD.

FWIW, it is about 20lbs, 10S electric, four bladed head turning 710s about 1100 rpm. This is the most headspeed we can get out of these mechanics without changing motors or batteries. These are the same mechanics that fly just fine at 1100 HS with 800mm blades at 30lbs.

Any direction you might be able to provide is appreciated.
Thanks, Matt
Basmntdweller is offline        Reply With Quote Quick reply to this message
Sponsored Links
Old 07-27-2010, 02:30 AM   #2 (permalink)
Registered Users
Posts: 9,261
My HF Map location
Join Date: Sep 2007
Location: Cape Town, South Africa

The unit is the same as the Turnigy TBar 600, so you can dig into that thread as well. The shudder you mention is definately vibration related. Mount the unit on thick double sided tape and strap it down with a Velcro strap.

As for the tail, you definately would need more power from it, larger blades or increased tail rpm should do the trick. I don't know what mechanics you are using, but swinging 4X 800mm blades require a lot of torque and you have to counter that with enough power.
Gaui R5, Henseleit TDR, TDR2, TDF, Banshee
Kontronik, Scorpion ESC, iChargers, VBar, VControl, JR XG11
Old hand at Planks
Vinger is online now        Reply With Quote Quick reply to this message

Quick Reply

Register Now

In order to be able to post messages on the HeliFreak forums, you must first register.
Please enter your desired user name, your REAL and WORKING email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself. Use a real email address or you will not be granted access to the site. Thank you.
Email Address:
Where do you live? ie: Country, State, City or General Geographic Location please.
Name and Lastname
Enter name and last name here. (This information is not shown to the general public. Optional)
Helicopter #1
Enter Helicopter #1 type and equipment.
Please select your insurance company (Optional)
Helicopter #2
Enter Helicopter #2 type and equipment.
Helicopter #3
Enter Helicopter #3 type and equipment.
Helicopter #4
Enter Helicopter #4 type and equipment.


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Copyright © Website Acquisitions Inc. All rights reserved.

SEO by vBSEO 3.6.1