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 03-11-2012, 01:49 PM   #1
kmagjr
Registered Users
 

Join Date: Nov 2007
Location: Upstate NY USA
Default trex 450 se v2

Im new to this fun, have built my trex 450 se v2 have it set up and I tried to fly it this morning, and when it gets off the ground, it jumps up and down like it is having a seisure. Is there anybody that can help me? Oh yea the first flight did not end well.
kmagjr is offline        Reply With Quote
Old 03-11-2012, 11:51 PM   #2
OC Heli Tech
Registered Users
 
Posts: 461
 

Join Date: Oct 2009
Location: Westminster
Default

1st what radio and what is ur throttle cures and pitch curves

2nd, how many degrees are you running?
__________________
"If you're not crashing, you're not flying"
T-Rex 450, 500, 550, 700E JR9503 2.4 Micro Beast
Ochelitech.com
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
OC Heli Tech is offline        Reply With Quote
Old 03-12-2012, 12:42 AM   #3
nmdesertracer
Registered Users
 
Posts: 944
 
My HF Map location
Join Date: Feb 2012
Location: New Mexico
Default

Do you have any + expo in your radio? Im a newbie and im running +30% to slow the action down.
nmdesertracer is offline        Reply With Quote
Old 03-12-2012, 03:58 AM   #4
Andy01
Registered Users
 
Posts: 3,850
 

Join Date: Apr 2008
Location: Brisbane, Australia
Default

More info would be helpful.

When I started, my first "flight" did not end well. Went back to the sim, and used Radd's method, which helped a lot for fine control.

Colin
__________________
Vario Long Ranger 700e
Seahawk 600
UH-1N 500
Baumann EC-145 800+ (coming soon
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
)
Andy01 is offline        Reply With Quote
Old 03-13-2012, 08:28 PM   #5
Starcruiser
Registered Users
 
Posts: 3,810
 
My HF Map location
Join Date: Sep 2009
Location: Rockford, Illinois
Default

Possible causes;

Wind impacting lift
stiff links
TX has ratchet spring installed on throttle/collective
low battery (LVC)
slipping one-way
Slipping or loose pinion
head links loose?

these are the areas I suggest you review.
__________________
Carl
Trex 550E FS Vbar Pro 5.2- EXI-450T Mini Vbar Pro 5.2 - EXI 450T BeastX - Trex 250SE - mCPx v1 Hp05 & HP06 w/HP03t tails - AMA #952544
Starcruiser is offline        Reply With Quote
Old 03-13-2012, 08:32 PM   #6
kmagjr
Registered Users
Thread Starter Thread Starter
 

Join Date: Nov 2007
Location: Upstate NY USA
Default

my radio is a JR XP7202, JR DS285MG servos,JR DS3400G tail servo,Futaba GY401 Gyro,
Throtle curve is normal 0-50-80-90-100 Idle 1, 100-95-90-95-100
Pitch curve nornal 40-45-50-75-100 Idle 1, 0-25-50-75-100
kmagjr is offline        Reply With Quote
Old 03-14-2012, 03:30 AM   #7
Andy01
Registered Users
 
Posts: 3,850
 

Join Date: Apr 2008
Location: Brisbane, Australia
Default

I assume you have rebuilt the heli and checked everything over on the ground - checked pitch (both collective & cyclic), looked for damaged servo gears, bent or loose linkages, loose electrical connections etc etc.

I found that when starting most of the "heli being out of control" was actually the pilot because I was not used to the sensitivity of the sticks, especially compared to my previous coax heli. That is where I thought that Radd's method helped.

As asked above, are you using expo & how much pitch (especially cyclic) do you have ? What is your headspeed ? A high headspeed with no expo makes for a VERY twitchy 450.

Colin
__________________
Vario Long Ranger 700e
Seahawk 600
UH-1N 500
Baumann EC-145 800+ (coming soon
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
)
Andy01 is offline        Reply With Quote
Old 03-14-2012, 08:58 AM   #8
Starcruiser
Registered Users
 
Posts: 3,810
 
My HF Map location
Join Date: Sep 2009
Location: Rockford, Illinois
Default

I would concur with the Expo and new pilot statements.

This is why those who start on smaller heli's, like the MCPx or 250 sized do better when moving to the larger ones, your senses are sharpened due to how quick they can be versus the larger heli's.

For your 450 I would suggest you check and document the overall collective pitch range, should be about +/-11 (symmetrical) to start, some like it around 10, and cyclic should be around 6 to 8 to start. Expo should be at 20 to 30 to soften the stick response. this will make it easier on you to learn. Put on some training gear and try the Radd's course to start, this should assist you in tuning your stick skills. At the very least the training gear will allow you to maiden the heli with a smaller chance of a crash.
__________________
Carl
Trex 550E FS Vbar Pro 5.2- EXI-450T Mini Vbar Pro 5.2 - EXI 450T BeastX - Trex 250SE - mCPx v1 Hp05 & HP06 w/HP03t tails - AMA #952544
Starcruiser is offline        Reply With Quote
Old 03-15-2012, 05:56 PM   #9
dl5973
Registered Users
 

Join Date: Feb 2007
Location: Sydney Australia
Default

Quote:
Originally Posted by Starcruiser View Post
I would concur with the Expo and new pilot statements.

This is why those who start on smaller heli's, like the MCPx or 250 sized do better when moving to the larger ones, your senses are sharpened due to how quick they can be versus the larger heli's.

For your 450 I would suggest you check and document the overall collective pitch range, should be about +/-11 (symmetrical) to start, some like it around 10, and cyclic should be around 6 to 8 to start. Expo should be at 20 to 30 to soften the stick response. this will make it easier on you to learn. Put on some training gear and try the Radd's course to start, this should assist you in tuning your stick skills. At the very least the training gear will allow you to maiden the heli with a smaller chance of a crash.
I have been flying the trex 450 for years now and still run 30% expo on aile and elev.

expo is your friend its not just for newbies
dl5973 is offline        Reply With Quote
Old 03-15-2012, 09:21 PM   #10
kmagjr
Registered Users
Thread Starter Thread Starter
 

Join Date: Nov 2007
Location: Upstate NY USA
Default

Thank you to all the replies. I now have my expo set to 30% and will set my pitch. This weekend is when the weather is good and I can try this again.
kmagjr is offline        Reply With Quote
Old 03-16-2012, 07:17 AM   #11
latte
Registered Users
 
Posts: 1,455
 
My HF Map location
Join Date: Jun 2008
Location: Norway, Fredrikstad
Default

Meanwhile it could be a good idea to reference check your head-build with the manuals. Maybe you have something backwards?
__________________
700E DFC - Ikon
700N FBL - Ikon
latte is offline        Reply With Quote
Old 03-17-2012, 10:49 AM   #12
kmagjr
Registered Users
Thread Starter Thread Starter
 

Join Date: Nov 2007
Location: Upstate NY USA
Default

Checked all moving parts today. Ready to try it again. I have the expo at 30% but am questioning weather I should slow the head speed down or not, and how slow to bring it down to.
kmagjr is offline        Reply With Quote
Old 03-17-2012, 11:27 AM   #13
Starcruiser
Registered Users
 
Posts: 3,810
 
My HF Map location
Join Date: Sep 2009
Location: Rockford, Illinois
Default

2400 to 2600 would be ok to start IMO. But try it out with what you have it set at and see how it behaves. it will seem twitchy to you, do not hold the sticks for corrections but bump them to make small corrections otherwise you will chase the heli and end up crashing. Just my .02
__________________
Carl
Trex 550E FS Vbar Pro 5.2- EXI-450T Mini Vbar Pro 5.2 - EXI 450T BeastX - Trex 250SE - mCPx v1 Hp05 & HP06 w/HP03t tails - AMA #952544
Starcruiser is offline        Reply With Quote
Old 03-17-2012, 01:18 PM   #14
salrica
Registered Users
 

Join Date: Jan 2011
Location: N.C.
Default

Quote:
Originally Posted by kmagjr View Post
Checked all moving parts today. Ready to try it again. I have the expo at 30% but am questioning weather I should slow the head speed down or not, and how slow to bring it down to.
I would check the head, for example dampeners and linkage measurements .
Check for grease on dampers and on feathering shaft.
What pitch do you have on mid, low and high stick?
salrica is offline        Reply With Quote
Old 03-18-2012, 01:20 PM   #15
nmdesertracer
Registered Users
 
Posts: 944
 
My HF Map location
Join Date: Feb 2012
Location: New Mexico
Default

Its better to have higher head speed and use less pitch for take off and hover. Then low head speed and more pitch for take off which will make your tail twitchy. I just switched from aligns white fiber blades to the 325d pro blades. I didnt think blades would make that much of a difference. Im going back to the fiber blades for now. There 20g heavier then the pro blades. Practice on a sim on the throttle cut switch it will save you $$ in a crash!!
nmdesertracer 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