Linkage Length and other Questions :) - HeliFreak
Fun, Learning, Friendship and Mutual Respect START  HERE


Unregistered
Go Back   HeliFreak > R/C Helicopter Support > Compass Model Helicopters > eXo



Reply
 
LinkBack Thread Tools Display Modes
Old 02-12-2018, 02:35 PM   #1 (permalink)
Registered Users
 
Posts: 421
 

Join Date: Jul 2012
Location: Minneapolis, MN
Default Linkage Length and other Questions :)

I'm hoping this is my last question set.

I set my servo-to-swash links to ~82.5mm and the flybarless links to ~39mm.

I've got a couple degrees of positive pitch at mid stick (servo horns centered on KST servos). Which links should I shorten? I'm guessing I'm gonna need 4-5 turns.

If I shorten the servo-to-swash links, the swash will drop. If I shorten the flybarless links, the swash will stay where it is (relative to the mainshaft.)

Also, what are you guys running for timing/pwm settings on the hobbywing 100/rage motor?

The specs I've found say 18 degrees 10khz. I can run 8,16,24,or 32khz.

Lastly, max headspeed? She's gonna fly soon...

Thanks guys.
__________________
Current Fleet--Goblin 770 Comp, Trex 700L, Compass EXO, Oxy 3 285, Blade 130x--Old Friends--Trex 700n, Trex 600n, Gaui X5, Blade 450x, Blade 180cfx, Blade mcpx, Walkera 4#6

Last edited by fluxcapacitor121; 02-12-2018 at 05:07 PM..
fluxcapacitor121 is offline        Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 02-12-2018, 10:47 PM   #2 (permalink)
Registered Users
 
Posts: 421
Thread Starter Thread Starter
 

Join Date: Jul 2012
Location: Minneapolis, MN
Default

Well I kinda answered my own question.

I only got one complete turn outta the flybarless links. If I try for 2 turns, the plastic on the link bottoms out against the jam nut. I guess all the links will have to be a little shorter. I'm wondering if the kst output shafts sit a little higher than the mks?
__________________
Current Fleet--Goblin 770 Comp, Trex 700L, Compass EXO, Oxy 3 285, Blade 130x--Old Friends--Trex 700n, Trex 600n, Gaui X5, Blade 450x, Blade 180cfx, Blade mcpx, Walkera 4#6

Last edited by fluxcapacitor121; 02-13-2018 at 01:20 AM..
fluxcapacitor121 is offline        Reply With Quote Quick reply to this message
Old 02-13-2018, 09:45 AM   #3 (permalink)
Registered Users
 
Posts: 5,312
 

Join Date: Jul 2012
Location: Toronto, Canada
Default

If you are following the suggested lengths from the manual those are specific to mks servos. Kst servo shaft position is probably is not the same as mks.
__________________
KBDD Team Pilot / Team Compass
Compass Chronos | 7HVU | 550U | Atom 5.5 | Gaui X3 #1 | X3 #2
cyclo is online now        Reply With Quote Quick reply to this message
Old 02-15-2018, 11:37 AM   #4 (permalink)
Registered Users
 
Posts: 19,246
 

Join Date: Jan 2006
Location: Alhambra, CA
Default

I am running JR servos in both of my eXo's, so the lengths will be different there also.

The key thing is not to have the servo to swashplate pushrods so short that the swashplate bottom will not interfere with the top of the frames at the extremes of cyclic throw.

Another important thing is to make sure that the rods are threaded into the links and SZ arms enough to stay in properly.

I can measure the height of the swashplate at zero collective/zero cyclic later today and post that, if it will help. It should give you a good starting point.
__________________
KBDD-Team Captain/Compass Team Manager/Experience R/C/ Team JR Americas/ Western Robotics Field Representative
6HV-U, Warp, 7HV,Knight Pro,Knight 3D, Atom, Atom Stretch, Odin II, 6HV, 3D Plus, Knight 50, Chronos
Ah Clem is offline        Reply With Quote Quick reply to this message
Old 02-17-2018, 03:18 PM   #5 (permalink)
Registered Users
 
Posts: 421
Thread Starter Thread Starter
 

Join Date: Jul 2012
Location: Minneapolis, MN
Default

One turn on the flybarless links and 3 turns on the servo to swash links got her all dialed in. Swash is no where near interfering at all extremes.

For you vbar guys, the 13.5mm mks arms yielded me an 80 setting on collective at 13 degrees, and also 80 on the 8 degree cyclic calibration. 13.5mm is perfect for the tail, giving me right around 100 in both directions.

If you want your cyclic/collective numbers closer to 100, I'd say about 12-12.5mm ball spacing. But, mikado says 80-110 is fine.

The rake on this thing is awesome. I maxed out my leveling table setting up the head with the soko. Had to shim the front...
Attached Thumbnails
Click image for larger version

Name:	IMG_0678.jpg
Views:	25
Size:	126.6 KB
ID:	737885   Click image for larger version

Name:	IMG_0680.jpg
Views:	28
Size:	94.6 KB
ID:	737886  
fluxcapacitor121 is offline        Reply With Quote Quick reply to this message
Old 02-17-2018, 07:26 PM   #6 (permalink)
Registered Users
 
Posts: 3,611
 

Join Date: Apr 2016
Location: USA
Default

Come on! Let's see the first flight! I'm getting impatient.

A very cool looking heli. Awesome canopy.

I sold mine though.

Sent from my XT1650 using Tapatalk
Thickfog is offline        Reply With Quote Quick reply to this message
Old 02-17-2018, 07:44 PM   #7 (permalink)
Registered Users
 
Posts: 421
Thread Starter Thread Starter
 

Join Date: Jul 2012
Location: Minneapolis, MN
Default

I wish. It's 20 degrees here. Snow on Monday.

She's a little big for an indoor hover...
__________________
Current Fleet--Goblin 770 Comp, Trex 700L, Compass EXO, Oxy 3 285, Blade 130x--Old Friends--Trex 700n, Trex 600n, Gaui X5, Blade 450x, Blade 180cfx, Blade mcpx, Walkera 4#6
fluxcapacitor121 is offline        Reply With Quote Quick reply to this message
Old 02-17-2018, 08:05 PM   #8 (permalink)
Registered Users
 
Posts: 3,611
 

Join Date: Apr 2016
Location: USA
Default

Dl

Last edited by Thickfog; 02-26-2018 at 10:45 PM..
Thickfog is offline        Reply With Quote Quick reply to this message
Old 02-28-2018, 09:01 PM   #9 (permalink)
Registered Users
 
Posts: 297
 

Join Date: Jun 2013
Location: Shasta Lake Ca.
Default

Quote:
Originally Posted by fluxcapacitor121 View Post
I'm hoping this is my last question set.

I set my servo-to-swash links to ~82.5mm and the flybarless links to ~39mm.

I've got a couple degrees of positive pitch at mid stick (servo horns centered on KST servos). Which links should I shorten? I'm guessing I'm gonna need 4-5 turns.

If I shorten the servo-to-swash links, the swash will drop. If I shorten the flybarless links, the swash will stay where it is (relative to the mainshaft.)

Also, what are you guys running for timing/pwm settings on the hobbywing 100/rage motor?

The specs I've found say 18 degrees 10khz. I can run 8,16,24,or 32khz.

Lastly, max headspeed? She's gonna fly soon...

Thanks guys.
on my exo that is equipped with KST servos, my ball links are pretty much bottomed out on the rod. Only 1 thread showing. inner measurement between the links is 38.9 mm outer measurement is 82.05mm cant give you the other lengths currently rebuilding the head. hope this helps. my hobbywing 100 amp v3 settings with the rage motor, I am running factory defaults in gov store mode.
__________________
KBDD TEAM PILOT/Compass field rep.
Brain fbl
Futaba 8fg/14sg
mike pound is offline        Reply With Quote Quick reply to this message
Reply




Quick Reply
Message:
Options

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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
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:
Location
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.
Helicopter #2
Enter Helicopter #2 type and equipment.
Helicopter #3
Enter Helicopter #3 type and equipment.
Helicopter #4
Enter Helicopter #4 type and equipment.

Log-in

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.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.

SEO by vBSEO 3.6.1