RunRyder RC
 2  Topic Subscribe
WATCH
 1 page 772 views
Scorpion Power Scorpion Power
Helicopter
e-
Align
Other › Tracking Question
10-08-2005 01:41 AM  12 years agoPost 1
SJS

rrApprentice

NYC

My Posts: All  Forum  Topic

Here's a good one. At 0 deg the tracking is slightly off. at 4-5 deg the tracking is perfect. At -5 deg the tracking is way off. When I adj the tracking at 0 deg perfect, the tracking was off on + and - pitches. Everything is true and there is nothing out of whack. I do notice that the tracking will change during the flight, but not often. I have the black main grips w/ align mixing arms and swash (the new ccpm).

SJS

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-08-2005 02:06 AM  12 years agoPost 2
MikeInMobile

rrElite Veteran

Mobile, Alabama

My Posts: All  Forum  Topic

You may have a slightly twisted blade (lay the blades on a piece of glass or a mirror and you will see the error). Try a different set of blades. When you setup the mechanics of your heli, were the mixing arms PERFECTLY level at zero pitch? If they were not, this could also be your problem (the mixing arms move in an arc, not a straight line. If they are not aligned properly for zero pitch, then the amount that they move for a given input may not be symetrical, this creating the error). Try these things, one of them will be the issue !

PM  EMAIL  GALLERY  Attn:RR  Quote
10-08-2005 02:27 AM  12 years agoPost 3
Tmaster

rrKey Veteran

TX

My Posts: All  Forum  Topic

the plastic endlinks are not perfect. I had tracking problems at first. Good to have a set to micrometers to measure. Measure the centers and the overall length of the linkages to get two measurements for one linkage. I found that one of my lower linkages in the head system was off just slightly. I then went over everything again with the micrometers.

If everything is set exactly right, the blades are the problem, MikeInMobile said blades twisted, thats exactly true. These are cheap blades. I had to bend on one of mine to get it to track right.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-08-2005 03:17 AM  12 years agoPost 4
SJS

rrApprentice

NYC

My Posts: All  Forum  Topic

I'll check the linkage lengths and mixing arm settings. The blades look true and are the mavvrik c/f blades from heliproz. Something else, the links used to adjust the pitch arfe not the same. One is longer than the other to get the tracking level. Could one of the other links cause this problem?

SJS

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-08-2005 03:27 AM  12 years agoPost 5
MikeInMobile

rrElite Veteran

Mobile, Alabama

My Posts: All  Forum  Topic

Looks like your mechanical setup is off (at zero degrees pitch, all of the mixing arms should be perfectly level). This will cause tracking differences as the pitch is changed (the pitch setting for each blade is created by the differential arc of the mixing arms. Since these arms move in an arc, the movement is not symetrical at different points in the ytavel)

PM  EMAIL  GALLERY  Attn:RR  Quote
10-08-2005 05:56 AM  12 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

MIght also be a warped head. I've been having tracking problems with one of my two T-Rexs most of the summer. No matter what I did, the darn thing never tracked well throughout the pitch range.

Early in the season, I changed out the original V2 head for one of the plastic "upgrades" that had the deeper recesses so you could run four O-rings instead of the two that the stock V2 head uses. The new head was supposed to be stiffer and solve those tracking blues.

On a hunch recently, I put the old V2 head back on, and tracking has never been better on this particular T-Rex. After looking at the "bad, newer" head, it's obvious that it isn't straight. This is the same design head that is shipping with the new XLs, only it is gray, not black plastic. There have been other posts about the black plastic head being "bent" here on RR.

Dave

PM  EMAIL  GALLERY  Attn:RR  Quote
10-08-2005 05:58 AM  12 years agoPost 7
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

If you're running the Mav CF blades, I don't think the blades are warped. I've seen several pair of those fly and they are nice, nice, nice!

If you're flying the stock woodies that come with the kit, then you might be able to talk about warped blades.

Dave

PM  EMAIL  GALLERY  Attn:RR  Quote
10-08-2005 11:28 PM  12 years agoPost 8
SJS

rrApprentice

NYC

My Posts: All  Forum  Topic

Thanks for the heads up. I'll adjust the pitch links and arms to zero and let you know what happens.

SJS

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-10-2005 02:06 AM  12 years agoPost 9
SJS

rrApprentice

NYC

My Posts: All  Forum  Topic

I figured out the problem. One of the links off the main grips was bad. Bas, as in it was about 2mm shorter than the normal ones. I upgraded to the cf frames off the stock 450x and swapped the grey links for black ones. I guess I missed that one. Since then, the tracking is on the money and there is no difference in tracking at any degree. The only thing that I don't like is that when I measure up the pitch links exatly the same, and everyting else on the head is exactly the same, the tracking is off about 1 1/2 turns. (about 1 degree). I assume its because of the plastic grips. However, I won't complain as long as it flies right.

SJS

BTW, I think I need more than 6 deg of cyclic. Holding it in my hand, the ail and elev cyclic seems slow. I originally had 10-12 deg. That was fun. What headspeeds are you running. I run 2200 norm and 2600 Idle1.

SJS

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-10-2005 02:55 AM  12 years agoPost 10
Titan520

rrApprentice

Philippines

My Posts: All  Forum  Topic

There are just some blades that are really hard to track..

What is acceptable tracking for you guys? I can track blades on the dot, but some are really difficult to track. Is 1/5 to 1/6 inch range acceptable?

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-10-2005 03:18 AM  12 years agoPost 11
MikeInMobile

rrElite Veteran

Mobile, Alabama

My Posts: All  Forum  Topic

A lot of people run more than 6 degrees of cyclic, but at a cyclic input of over 6 degrees, the blades stall and stop creating lift. If you like to see your helicopter falling instead of flying, use more than 6 degrees of cyclic.

If you want your cyclic faster, route out the center of your flybar paddles and cover them in heatshrink ..... this will make your cyclic unreal (virtually no mass on the flybar = unstable cyclic = unreal cyclic).

Now, the cyclic number is neutral to extreme left or right .... not extreme left to extreme right ! If you have your pitch setup at zero, and get 6 degrees when you bury the stick in either direction, you have a cyclic rate of 6 degrees.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-10-2005 04:23 AM  12 years agoPost 12
SJS

rrApprentice

NYC

My Posts: All  Forum  Topic

I like the flybar paddles idea. I'm just that unstable to try that. Besides, then I can make my paddles look pretty like my blades. What headspeed are you running your idle 1 Mike?

SJS

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-10-2005 04:34 AM  12 years agoPost 13
MikeInMobile

rrElite Veteran

Mobile, Alabama

My Posts: All  Forum  Topic

3200 RPM ...... a little extreme, but makes the machine fly like it's on rails. Using Maverick carbon 325's (about the only blade that will take that kind of headspeed), and Jet Hobby carbon tail blades. With this type of headspeed, the heli only needs 3 degrees of pitch at hover, which leaves LOTS of pitch available for other things

The easiest way to lighten the paddles is to drill out most of the center of the paddles (a little easier than routing them). Just make sure that they weigh EXACTLY the same!

PM  EMAIL  GALLERY  Attn:RR  Quote
10-10-2005 04:44 AM  12 years agoPost 14
SJS

rrApprentice

NYC

My Posts: All  Forum  Topic

What kind of flight times are you getting? I'm looking at about 7 minutes at my speed on 2100 3 cells. Do the c/f tail blades make a difference?

SJS

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-10-2005 05:04 AM  12 years agoPost 15
MikeInMobile

rrElite Veteran

Mobile, Alabama

My Posts: All  Forum  Topic

Anywhere from 10 to 12 minutes on a TP2100 Pro-Lite. Had to switch to the Pro-Lites with the 400DH because my battery temperatures with my TP2100 Gen 2's were a little too high (20 degrees above ambient). The Maverick baldes DO help the flight times also because of the way that they are made. I cut apart a set that I cracked in a crash (notice that I said CRACKED, not broken). The blades seem to be laid up around the foam core, rather than molded in halves then joined. These blades are extremely quiet, which results in less resistance to the air, which means lower current requirements from the batteries. I also have shortened the motor leads on my CC35 to about 1/4 inch to further reduce the power losses in the system.

PM  EMAIL  GALLERY  Attn:RR  Quote
10-11-2005 11:36 AM  12 years agoPost 16
SJS

rrApprentice

NYC

My Posts: All  Forum  Topic

Any hints on how to get 10-12 min out of my setup running your head speeds?

SJS

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
10-11-2005 06:53 PM  12 years agoPost 17
Tmaster

rrKey Veteran

TX

My Posts: All  Forum  Topic

7 min is pretty bad for a 2100 pack. I get 10 min hovering and 14 min flying with my tanic 2220, my heli is 725g and im not running a outrunner. I also have the throttle fixed at 100% all through the pitches.

ways to help flght time:

Get the esc cooler
Get the motor cooler
shorten servo wires custom
Lighten the frame
Make sure nothing is binding in the drive train
Right pinion mesh
Right belt drive tension
Correct pinion size and throttle curve
Balance of the heli overall
Proper tracking
Free moving linkages
Properly oiled shaft area's

PM  EMAIL  GALLERY  Attn:RR  Quote
10-14-2005 04:01 AM  12 years agoPost 18
SJS

rrApprentice

NYC

My Posts: All  Forum  Topic

my throttle is set at 40% on gov high to get 2600 on the head. If I go 100% on the throttle curve, My head speed would be ballistic and I would max out the speed controller.

SJS

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
WATCH
 1 page 772 views
Scorpion Power Scorpion Power
Helicopter
e-
Align
Other › Tracking Question
 Print TOPIC  Make Suggestion 

 2  Topic Subscribe

Friday, November 24 - 9:38 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online