Fun, Learning, Friendship and Mutual Respect
START  HERE


Unregistered
Go Back   HeliFreak > R/C Helicopter Support > 450 Class Electric Helicopters


450 Class Electric Helicopters 450 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


Reply
 
Thread Tools Display Modes
Old 08-14-2009, 11:12 AM   #1
benzee1
Registered Users
 
Posts: 1,307
 
My HF Map location
Join Date: Jun 2008
Location: Cedar Vale, KS
Default Swash mix question

My swash is set at 60%. Got +/- 10 on pitch. I want to set it to 12 deg. I increased swash to 70% and pitch didn't change. So I set swash mixes to 100%, still have + 10 deg pitch. Now, I see my servos increase their throw, but my pitch doesn't change. If I drop swash to 40%, then my pitch decreases. Why wouldn't my pitch increase when I increase swash mix, even though I can see the servos increase their throw?

I'm confused.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

HeliSimRC
Spektrum DX7, DX6i
TREX 450, Blade 400, Blade CX2
Myspace.com/heliwhore
benzee1 is offline        Reply With Quote
Old 08-14-2009, 11:19 AM   #2
JoelKatz
Registered Users
 

Join Date: Feb 2009
Location: Murphys, CA
Default

Check the geometry of the servo horns to the linkages.

When the servo is centered and the horn is at 90 degrees, swash rotation turns perfectly into linkage movement. As the angle increases or decreases, it takes more and more swash rotation to produce the same amount of linkage movement. Once the angle gets close to 0 or 180, rotating the horn just moves the linkage forward or backward, not up or down.

The solution is probably to increase the servo horn length, usually by moving the linkage ball to a hole further from the center.
__________________
--
AMA 603884
JoelKatz is offline        Reply With Quote
Old 08-14-2009, 11:20 AM   #3
life2short1971
Registered Users
 

Join Date: Jan 2009
Location: Fort White,Florida
Default

Sevo arm center to ball center you need 12-13mm to get 12degree pitch.
__________________
Scott

Trex 500 / /3026-1600/CC Ice75 /3G /Ds510's/Torsion 430 fbl's
Trex 450 pro/HK2221-8/ Ice 50 /HS-5065MG/325D's/Kbdd's

Last edited by life2short1971; 08-14-2009 at 11:23 AM.. Reason: ..
life2short1971 is offline        Reply With Quote
Old 08-14-2009, 11:22 AM   #4
benzee1
Registered Users
 
Posts: 1,307
Thread Starter Thread Starter
 
My HF Map location
Join Date: Jun 2008
Location: Cedar Vale, KS
Default

Yes, I set all three so they are kept equal.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

HeliSimRC
Spektrum DX7, DX6i
TREX 450, Blade 400, Blade CX2
Myspace.com/heliwhore
benzee1 is offline        Reply With Quote
Old 08-14-2009, 11:25 AM   #5
life2short1971
Registered Users
 

Join Date: Jan 2009
Location: Fort White,Florida
Default

Boy your fast.LOL I changed previous post assuming you had.
__________________
Scott

Trex 500 / /3026-1600/CC Ice75 /3G /Ds510's/Torsion 430 fbl's
Trex 450 pro/HK2221-8/ Ice 50 /HS-5065MG/325D's/Kbdd's
life2short1971 is offline        Reply With Quote
Old 08-14-2009, 11:28 AM   #6
benzee1
Registered Users
 
Posts: 1,307
Thread Starter Thread Starter
 
My HF Map location
Join Date: Jun 2008
Location: Cedar Vale, KS
Default

Joel, what you said makes sense. I'll check it out and see if the swash moves any higher or not when the servos throw more. If not, I'll replace the arms and extend the links out.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

HeliSimRC
Spektrum DX7, DX6i
TREX 450, Blade 400, Blade CX2
Myspace.com/heliwhore
benzee1 is offline        Reply With Quote
Old 08-14-2009, 06:34 PM   #7
Bob O
HF Support
 
Posts: 26,425
 
My HF Map location
Join Date: Dec 2008
Location: Negaunee, Michigan
Default

I know this sounds stupid but I've read of stranger things happening with the DX-7. Try rebinding with the new swash mix value and see if that helps.

But if you see increased travel in the servo arms, that should translate into increased pitch, unless your swash is hitting the head block and binding.

Wierd.
__________________
):> Team HeliFreak
SPARTANRC - R&D Team
GAUI X4II - VX1, WARP 360 - VX1n
Futaba 14SG
Bob O is online now        Reply With Quote
Old 08-14-2009, 06:41 PM   #8
benzee1
Registered Users
 
Posts: 1,307
Thread Starter Thread Starter
 
My HF Map location
Join Date: Jun 2008
Location: Cedar Vale, KS
Default

I noticed that when I increase the elevator to 100%, the servo cage moves but the arms barely move at all. So yes, I need to move balls out on servo arms.

On side note, I increased pinion to a 13t (was 11t) and it handles the wind a lot better. But I had a booom strike.....see other thread.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

HeliSimRC
Spektrum DX7, DX6i
TREX 450, Blade 400, Blade CX2
Myspace.com/heliwhore
benzee1 is offline        Reply With Quote
Reply




Unregistered
Go Back   HeliFreak > R/C Helicopter Support > 450 Class Electric Helicopters


450 Class Electric Helicopters 450 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


Copyright © 2004-2011 - William James - Helifreak.com