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T-REX 450 › trex 450 fly's like Sh.........
01-18-2010 02:09 AM  8 years agoPost 1
RcNutTz

rrApprentice

Chicago Illinois USA

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I got a 450 for my kid and it needed parts and some work I got it all back together and the test fly was horrible very slow responding hole thing has a wobble to it (frame, tail & head)

its a "sa" frame with all "se" parts

I installed the following new parts
linkage
blades
main shaft
feathering shaft
tail shaft
tail belt
ds410 (cyclic)
upper and lower main frame

I looked it over I had it all torn a part checked all the bearings, cleaned it and put it all together as the manual stated

what would cause the hole thing to have a wobble?

yes dear the hobby shop again

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01-18-2010 02:10 AM  8 years agoPost 2
kingair

rrKey Veteran

Utah - USA

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Low headspeed and or tight new dampers. Run the thing in idle up with 100% straight across and it'll smooth right out.

There is a very fine line between "hobby" and "mental illness."

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01-18-2010 02:17 AM  8 years agoPost 3
RcNutTz

rrApprentice

Chicago Illinois USA

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what should the head speed be? (its his 1st heli be hovering mostly)

yes dear the hobby shop again

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01-18-2010 02:35 AM  8 years agoPost 4
kingair

rrKey Veteran

Utah - USA

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Just start bumping the headspeed up until the wobble goes away, and it will. For a first heli where you'll be mostly hovering you certainly don't need a really high headspeed but it needs to be high enough for stability.

There is a very fine line between "hobby" and "mental illness."

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01-18-2010 03:02 AM  8 years agoPost 5
Chief_USN

rrKey Veteran

Chesapeake, VA

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When I first got my SA, I set it up with a 10t pinion and if I remember correctly 80% throttle and +/-10° of pitch. I believe the headspeed was about 2400rpm. It was about 3yrs ago and I didn't keep it that way for long since I already knew how to fly. I do know that the bird wobbled more than what I expected out of the box. I up'd the throttle and it smoothed out. I ended up with a 13t and Scorpion -8 at about 3K on the head. Awesome little machine now. Will hover hands off like a 30-50 size. I have noticed that on most of the 450 size helis, you need at least a 26-2800 headspeed to make them stable. Obvisously, the higher the HS the quicker the response, just tame down the swash mixes or add some expo.

Chad

Team HeliProz 12-14
US Navy Chiefs...Unity, Service, & Navigation to the Fleet since 1893

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01-18-2010 03:33 AM  8 years agoPost 6
toolman18

rrElite Veteran

Portland Tx

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+1 on higher headspeed. I see alot of people set these up and they think the headspeed is good but its always a little low. As said before, bump it a little at a time until the wobble is gone.

Also make sure your blades are balanced.

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01-18-2010 04:10 AM  8 years agoPost 7
LonR

rrElite Veteran

Macomb,Mi

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very slow responding hole thing has a wobble to it (frame, tail & head)
+1 on low head speed.

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01-18-2010 05:05 PM  8 years agoPost 8
RcNutTz

rrApprentice

Chicago Illinois USA

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I'll bump up the head speed and let you know the out come

thanks for the input

yes dear the hobby shop again

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01-18-2010 09:04 PM  8 years agoPost 9
DustinB

rrNovice

Houston, TX

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With an align 430XL motor and 12T pinion you are around 2900-3000 rpm I believe. I was running a 13T pinion at 100% throttle around 3200rpm. No real reason not to fly less than 2900 rpm other than maybe a tiny bit more flight time. I'd still fly the higher headspeed, the heli is much more stable. Just teach him to use the throttle hold before the heli crashes, high rpm + ground = time & $$$.

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01-18-2010 10:24 PM  8 years agoPost 10
RcNutTz

rrApprentice

Chicago Illinois USA

My Posts: All  Forum  Topic

Well you guys was right on the money! head speed about about 2200rpm's I bumped it up to 2800rpm's and what a difference the wobble is gone much more stable and responds like it should, now I just need to go over the gyro and get it dialed in

Thanks Guys!

yes dear the hobby shop again

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