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T-REX 450 › TO MUCH PITCH.......VID CRASH.16/01/09
01-14-2009 01:24 PM  9 years agoPost 1
helinelly

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st.helens england

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hi guys...i have just been to a field close to my home to go inverted for the first time with my rex 450......did a few backflips at about 30ft and it seemed ok.....
i then did a side flip at about 5ft to get it inverted and CRAPPED MY PANTS,
my rex just wanted to suck its self to the ground and i was bracing my self for a headspin follwed by a crash,
then about 6" off the ground it caught a airbubble push and i managed to backflip it out of there,only just tho.....when it was high up inverted it seemed ok, maybe i didnt relise it was falling....my pitch is 12+/0/12-in idle up throttle curv 100/90/80/90/100.......can you have to much pitch on these little rotors or am i bogging my motor....what are you guys using on your rex450 pitch.i am so use to my trex 600/700n that i forgot how twitchy these 450's are....kind regards helinelly

if it broken.....glue the bast#$d...keep flying..i tell the wife my crashes cost £20! works for me

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01-14-2009 02:08 PM  9 years agoPost 2
TomRex

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West Palm Beach Join Date: 12-28-2005

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Transitional delay is the culprit! Try and increase the center of your throttle curve and think about a grip flip!

Ignorance is the absence of facts.Stupid is lacking the intellectual capacity to comprehend the fact

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01-14-2009 02:41 PM  9 years agoPost 3
Ken4

rrApprentice

Singapore

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+12 -12 degs is ok if you are using a good esc/motor/pinion/battery combo. But in your case, its obviously not. Try 100 straight line throttle curve.

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01-14-2009 02:44 PM  9 years agoPost 4
colsy

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Cambridge, UK

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Did it 'bog' at all, +/- 12 degrees i found required v/good lipo's on 3s to maintain in heavy handed situations, depending on blades.

Col.

Only Quote From Experience.

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01-14-2009 05:11 PM  9 years agoPost 5
Andy_Johnstone

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Liverpool - England

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i use a 100% throttle curve on mine nell and you know how that flies, when it flies

Optifuel, NHP, Revolution Models, CSM Team pilot 2011

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01-14-2009 05:51 PM  9 years agoPost 6
helinelly

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st.helens england

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so this is ok
100.100.100.100.100 idle up......regards helinelly

if it broken.....glue the bast#$d...keep flying..i tell the wife my crashes cost £20! works for me

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01-14-2009 09:41 PM  9 years agoPost 7
colsy

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Cambridge, UK

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yup, all my leccies run flat curves on end points.

Col.

Only Quote From Experience.

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01-14-2009 09:56 PM  9 years agoPost 8
TaleGunner

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Deer Park WA

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Flat 100% for me too

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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01-15-2009 12:07 AM  9 years agoPost 9
Eagle2bravo

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Out flying somewhere

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100% flat here too

T-rex 600n super pro , Trex 450 se, Gaui 200, Trex 500, Blade cx, . "If ya plant corn, ya get c

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01-15-2009 03:48 AM  9 years agoPost 10
rilopez825

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Pembroke Pines, FL

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I run 100% Flat on a 4s pack. the pop is amazing either way with only 11+/-11

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01-16-2009 09:33 PM  9 years agoPost 11
helinelly

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st.helens england

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crashed with 100% linear trottle cyrve
http://uk.youtube.com/watch?v=lM6ycVBFvK4&fmt=18

man that sucks,,,but somthing else to learn.....dam....kind regards helinelly

if it broken.....glue the bast#$d...keep flying..i tell the wife my crashes cost £20! works for me

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01-16-2009 09:37 PM  9 years agoPost 12
Andy_Johnstone

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Liverpool - England

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nice to see its nice and stable in inverted flight, thats not too much pitch thats just not quick enough reactions its scary turning it over in a space that size i know i done it with the 500 much damage? hope to see it back sunday

Optifuel, NHP, Revolution Models, CSM Team pilot 2011

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01-16-2009 09:52 PM  9 years agoPost 13
rilopez825

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Pembroke Pines, FL

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I believe your problem is with your radio. I had the same exact problem and no one knew what it was. what you'll probably notice is that your swash plate moves slowly from positive pitch to negative pitch, but if you move your cyclic rapidly side to side it responds quickly. This is because of your Radio being on 72MHz technology. you need to move the spectrum Technology. you'll notice that swash plate move quickly either for collective or Cyclic.

What I figured the problem is that PCM receivers have to many checks and its trying to do this on 4 channels at the same time. remember your throttle is also a channel even though its not doing much being on a 100% flat curve its still a channel to that radio.

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01-17-2009 01:50 AM  9 years agoPost 14
dkshema

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Cedar Rapids, IA

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This is because of your Radio being on 72MHz technology.
What I figured the problem is that PCM receivers have to many checks and its trying to do this on 4 channels at the same time.
You can't be serious. I guess no one ever flew a heli in 3D mode prior to the introduction of 2.4 GHz systems. And even those who still fly on 72 MHz can never expect to do more than simple, slow, upright circuits around the field.

FWIW -- people were flying inverted and doing advanced aerobatics with helis LONG before 2.4 GHz was a twinkle in anyone's eye.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-17-2009 02:05 AM  9 years agoPost 15
vetrider

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Daleville, AL (Ft.Rucker)

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Better check your pitch again WITH a pitch guage. The picture in the first post is not of a -12 pitch setting on the blades.

That was funny dkshema, True but funny too.

Nolan

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01-17-2009 07:21 AM  9 years agoPost 16
NEM3

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New Lenox, Il

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This may be advancing into the problem a bit to much.

But, I ran my pitch curve on the 450 with expo. I am not sure how many points you have but give it a try. What you want is more pitch sooner. Especially between the 1/4 and 3/4 stick mark. Doing so will make it fly more like a nitro bird does.

My 450SE ran 13 each way with stock motor. So 12 shouldn't be a problem. I would do as vetrider suggested first. Make sure you have what you think you have.

And yes a 100% throttle curve on electrics is the best thing for them. Any less and your losing a lot of efficiency. Electric motors run at a set rpm for a set throttle position. And provided there is enough power (battery) behind the motor, it will continue to do so regardless of load applied. Of course that also depends on the torque of the motor, but hopefully you get the idea.

The reason you shouldn't be running at less than 100% throttle is that the controller must then switch the power on and off in rapid succesion to achieve the desired output. This wastes electricity in the controller and thus heats it up.

Ignore rilo's post, the entire thing is nothing but hot air. The measured latency difference between 72mhz PCM eCCPM mixing and 2.4Ghz eCCPM mixing is less than 10-30 milliseconds. Depending on which radio you choose to compare. And in fact a couple 72's are as fast or faster than the famed DSM/DSM2. Check here for the proof http://www.runryder.com/t172571p1/

When we get servos that transistion in 20 milliseconds (0.02) I'll start thinking about switching over.

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01-17-2009 08:25 AM  9 years agoPost 17
R38133

rrKey Veteran

USA

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Interesting fact. Radio waves travel at 700 miles per hour, or 1.0267 feet per millisecond
When did they change that fact??????

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01-17-2009 04:54 PM  9 years agoPost 18
helinelly

rrVeteran

st.helens england

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my rex 450 is now fixed
just got my rex flying again after lastnights fiasco....spindle.boom.main gear......not that bad for going in inverted........it realy is amazing that flying in such a small area to out side...when your out side and go inverted you dont relize how much space your taking up......anyhow guys happy flyinnnnnnnnnnn.kind regards helinelly

if it broken.....glue the bast#$d...keep flying..i tell the wife my crashes cost £20! works for me

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01-19-2009 06:21 PM  9 years agoPost 19
Zaneman007

rrElite Veteran

Texas - USA

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From the vid, the heli flew fine. It looked like it was going....?

IMO, Flying a 450 in that small space is a challenge in itself. Your flip to inverted looked good. Your ability to hold it inverted, didn't look so good. I'd say it was drifting forward and to the right, but you did manage to land it on the head, before it hit the wall. I assume that was your intent.(lol)

Just keep practicing.

Old Guys Rule!

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01-19-2009 07:00 PM  9 years agoPost 20
helinelly

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st.helens england

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i can fly inverted with my nitro's perfect
its the little 450 thats like a little wasp inverted.....oh yeah i meant to land it on its head button....yeah right...he he ha ha

if it broken.....glue the bast#$d...keep flying..i tell the wife my crashes cost £20! works for me

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