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HelicopterBeginners Corner › T-rex setup
01-28-2007 02:04 AM  10 years agoPost 1
Billingsnutz

rrApprentice

Summerville South Carolina/Mobile Alabama

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I can't for the life of me get my T-rex 450xl to fly right. This thing is way too sensitive. I can be flying in no wind and its still all over the place. So I'm wondering if its my set up. So can some one here tell whats best in terms of pi-curves, expo etc.

Annoying the world one person at a time

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01-28-2007 02:37 AM  10 years agoPost 2
UCGC

rrApprentice

Colorado

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I'm running my SE pretty standard on the set up. Throttle curve is 100% across the board in idle up, pulling about +10/-10 on the pitch. I'm not running any expo. FWIW, it is a twitchy little bugger.

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01-28-2007 05:27 AM  10 years agoPost 3
crash-

rrVeteran

Ca

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I run 10% expo 100% throttle curve.
In idle up

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01-28-2007 05:33 AM  10 years agoPost 4
n8tivedave

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simi valley,cal,u.s.

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ball links

did you size the ball links

if at first you dont succeed,buy,and fly again

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01-28-2007 05:34 AM  10 years agoPost 5
TrexRookie

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San Francisco, CA

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trex's are sensitive lil buggers... the twitchy-ness is probably best compensated with expo...

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01-28-2007 05:36 AM  10 years agoPost 6
Billingsnutz

rrApprentice

Summerville South Carolina/Mobile Alabama

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If you look in the t-rex forum you'll see my complete set-up. The problem is it just drifts all over the place. I want to get it where it will hover almost by itself.

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01-28-2007 05:43 AM  10 years agoPost 7
TrexRookie

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San Francisco, CA

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hmm.... assuming that your setup is +-10*, make sure that the push-pull levers on both aileron and pitch are parallel to the ground at mid-stick (meaning the two push-pull ball links should be perpendicular to the ground), and the arm for the elevator should be perpendicular to the ground... From there, make sure your servo horns are parallel to the control levers that they move... if you already did this, then forget about what I said and I'll go back to the drawing board on what might be causing your heli to be flying funny... what rx are you using by the way?

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01-28-2007 05:44 AM  10 years agoPost 8
marc8090

rrElite Veteran

Long Island, N.Y.

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T-Rex's are not twitchy at all if set up properly. Proper fitting ball links are essential, too tight and the machine will fly very poorly. And almost any heli will benefit from some expo, 30% to 40% is a good starting point on cyclic.

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01-28-2007 06:04 AM  10 years agoPost 9
Billingsnutz

rrApprentice

Summerville South Carolina/Mobile Alabama

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3 HS 55's, 401+HS 56BB, Futaba 9C and a Futaba FP-R1230F 8 channel reciever.

Thr-Curve Normal Pi-Curve Normal Revo Normal D/R Expo

1 0.0% 1 25.0% 1 -20% D/R 100%
2 30.0% 2 52.5% 2 -10% Expo 0%
3 59.0% 3 65.5% 3 0%
4 65.0% 4 79.0% 4 +10
5 100.0% 5 100.0% 5 +20

E.Point Sub Trim Trim
1.56/56 1 -87 Ail <- 72
2.44/47 2 +75 Elev v 48
3.100/100 3 0 Thro 0
4.100/100 4 0 Rudd <- 4
5.60/60 5 0
6.100/100 6 0
7.100/100 7 0
8.100/100 8 0

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01-28-2007 06:05 AM  10 years agoPost 10
Billingsnutz

rrApprentice

Summerville South Carolina/Mobile Alabama

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I know it looks jumbled up, but when I wrote this is was perfectly spread out. When I posted it, it all got compressed together.

Annoying the world one person at a time

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01-28-2007 06:48 AM  10 years agoPost 11
crash-

rrVeteran

Ca

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Check for binding, has to be tight links
redo throttle curve point "3" 80 min
point "4" 80 or above

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01-28-2007 06:50 AM  10 years agoPost 12
Billingsnutz

rrApprentice

Summerville South Carolina/Mobile Alabama

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No binding.

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01-28-2007 06:54 AM  10 years agoPost 13
crash-

rrVeteran

Ca

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new servos?

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01-28-2007 06:55 AM  10 years agoPost 14
Billingsnutz

rrApprentice

Summerville South Carolina/Mobile Alabama

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yup

Annoying the world one person at a time

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01-28-2007 06:56 AM  10 years agoPost 15
Billingsnutz

rrApprentice

Summerville South Carolina/Mobile Alabama

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Everything is new except the 401 that I stripped off my Hawk.

Annoying the world one person at a time

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01-28-2007 07:06 AM  10 years agoPost 16
crash-

rrVeteran

Ca

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pm sented

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01-28-2007 07:12 AM  10 years agoPost 17
crash-

rrVeteran

Ca

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paddle dead on?

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01-28-2007 05:18 PM  10 years agoPost 18
UCGC

rrApprentice

Colorado

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T-Rex's are not twitchy at all if set up properly. Proper fitting ball links are essential, too tight and the machine will fly very poorly. And almost any heli will benefit from some expo, 30% to 40% is a good starting point on cyclic.
Sorry, I didn't word that very well. I mean they feel very snappy compared to a larger nitro heli. I shouldn't say twitchy, in fact I'd like to get the cyclic faster. They do fly very well.

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01-28-2007 05:47 PM  10 years agoPost 19
mikeflyz

rrApprentice

Westlake Village, CA

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Your servo endpoints are messed up! They should all be the same for CCPM! (100%) You're introducing a huge amount of interaction with uneven servo travel! Adjust the travel throws for CCPM on the SWASHPLATE AFR in the BASIC menu.

If you're running your 401 in HH mode, disable your REVO mixing.

You shouldn't have to run so much subtrim on the cyclic servos. Set the horns on the servos first so that they are equal. Use as little subtrim as possible. Clean your trims, subtrims and set your endpoints to 100% on channels 1, 2, and 6. Get the T-levers and horns parallel with each other and the #2 servo horn 90 degrees to the link. Then adjust the links downstream of the T levers to level the swashplate.

Mike
MA Fury Extreme, JetCopter SX

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01-28-2007 06:56 PM  10 years agoPost 20
TrexRookie

rrKey Veteran

San Francisco, CA

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They should all be the same for CCPM! (100%) You're introducing a huge amount of interaction with uneven servo travel! Adjust the travel throws for CCPM on the SWASHPLATE AFR in the BASIC menu.
not true. servo travel can be more inconsistent with smaller servos. but then again, a lot of that can be avoided if you don't use sub trims... subtrims are not really recommended for use in any servos when it comes to centering the servo horn... it's best to rotate the horns until they're at 90*.... from there, use your AFRs to adjust the max/min pitch... I've used both JR and Futaba so I know that JRs have AFR settings... I just can't remember how to get into that menu.. But the menu should have settings for aileron, elevator, and pitch. The default values for each would be at 60. Once the servo horns are properly centered (at mid stick with no subtrims and +-100 on your endpoints) zero out your pitch on your blades, then use the PITCH AFR to adjust your pitch travel...

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HelicopterBeginners Corner › T-rex setup
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