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T-REX 450 › Need help with "Pitch problems"
10-22-2009 08:21 PM  8 years agoPost 1
nnonname

rrNovice

Great Lake State

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I built a 450 SA and a 450 V2 a couple years back. The lower-end SA and it's program flies great, I have a Spektrum DX7 radio. The V2 however, I haven't flown much till now. For some reason no matter how much I elevate the pitch curve, the darn thing won't get off the ground until about 3/4 stick. I'm still a rookie and don't fly inverted so the stick all the way down is off on my rig. Just wondering if you could give me some things to try. I'd like it to get off the ground at a little less than 1/2 stick, then hover maybe a little higher stick than that, but not at 3/4 stick and above. Any help/suggestions would be much appreciated.

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10-22-2009 08:40 PM  8 years agoPost 2
Abraxxas

rrNovice

Plover, WI

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Are you sure it's a pitch problem and not a low headspeed/throttle curve problem? Something to double check first.

I would advise against setting your heli up like that and will explain in a minute, but, if you decide to do it anyways this should work for you...

Check your pitch with a pitch gauge, if you want to hover at 1/2 stick you'll want to unplug your motor from the ESC and and set your collective stick to center, now play with the center of your pitch curve until your blades are at +5 deg when your stick is in the middle, then down to -2 or -3 on the bottom or whatever you like it at. Make sure after you adjust the center that you make sure your curve is numerically a smooth arch, you'll have to fine tune above and below after changing the center that much. You'll also have to ramp your throttle curve up quickly on the bottom to match, you'll need full hover headspeed by the time you get to center stick.

Im sure you will hear different opinions from people on this but I set my pitch at 0deg in the middle and my +5deg around 2/3 stick, I would recommend this practice otherwise once you get better and set up an idle up curve when you switch between normal flight mode and idle up your heli is going to jump drastically. Or, if you set it up to be smooth between the stick positions your negative pitch curve is going to be extremely compressed compared to the positive curve.

Good luck

Its 7:45am, everyone land so I can call in sick...

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10-23-2009 12:43 AM  8 years agoPost 3
krashtagain

rrKey Veteran

ohio

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the darn thing won't get off the ground until about 3/4 stick
I bet she has a pile of - in it if that's the case .

Common practice is flat pitch at mid stick the set the top end at whatever you wish +10 or 11 will do you fine and let the pitch run linear between the two .

If you're wanting to get it off the ground before mid stick you're going to have to tune the pitch and the throttle curves lower so the heli is spooled up and ready for lift when you get to your desired point .

If you're not living on the edge you're just taking up space !

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10-23-2009 04:04 PM  8 years agoPost 4
MikeInMobile

rrElite Veteran

Mobile, Alabama

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Your hover pitch is dependant on your headspeed, but hover pitch should be between 2 and 4 degrees. I usually setup machines for a pitch curve of -2 - 3 - 6 for beginners in normal mode so that the pitch is rather mild, and setup the throttle curve for 0 - 75 - 100. This setup will make the machine very controllable for sport flying. If you want to fly 3D, you will need a radically different setup!

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10-24-2009 01:24 PM  8 years agoPost 5
helinelly

rrVeteran

st.helens england

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good quick set up tips
good quick set up tips

--------------------------------------------------------------------------------

power up your heli.
take 2 wires out of the motor.
put your throttle stick to the middle....mid stick.
go into sub trim.
eyeball all the servos there be it to 90...ps there is nothing wrong with eyeballing them,because lets face it before the swash leverling tool everybody eyeballed
sub trim them to 90.
throttle down
turn heli off
turn radio off
turn back on and all should be as 90 at mid stick

hope this is of some help 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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