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Advantage Hobby . GrandRC . Revolution Models

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e-E-Flite Blade CP CX 400-3D > Trimming out the CP
 
 
phlat
Heliman
Location: Canton, GA - USA

I'm getting better at hovering the blade now. I'm able to keep it in the air at a fairly good hover now and not feel completely on the razor's edge while flying. I'm more comfortable with the reaction times of the cyclic and collective/throttle inputs.

What I'm having trouble with is getting the tail trimmed out properly. I've gone through the motions of getting the gyro tuned so the tail isn't wagging or twitching and I'm close on the proportional mix but I need a little advice on tuning it.

When I prep for flight, my normal routine is turn on transmitter, down throttle/collective, verify trim on t/c is down, and idle up is back.
Then connecting the in battery pack and wait for 4-in-1 to arm.

Once i have green light and get clear, I put t/c trim up to almost middle. Currently I listen for the tail motor to start making a little noise and go one notch short of that. The trouble is the trim is about 4-5 notches below dead center.

My question is this, should I reduce or increase the proportional mix to get rid of this? My first guess is to reduce it by like an 1/8th or 1/16 of a turn. This thing is damned close to set so I'm very happy.

This is my first R/C aircraft and I'm enjoying the hell out of it. My step son (all of 3) loves seeing it fly. I've managed to tear up only one set of blades so far and the set I've got on there now are holding up pretty well. I've ding'd them a couple of places but for the most part the skins are still in tact with only a small piece torn on the end of one.

Thanks for any input!
06-15-2006 Over year old.
HOMEPAGE  
 
 
Kdog35
Senior Heliman
Location: Lancaster, CA

Hi Phlat, I'm a beginner like you and been flying my CP for about a month now. I can hovor somewhat, but basically keep the chopper in a 6' area.

Have you seen the videos that "slider" had posted here on this site? Check them out, they are helpful. The only thing I've experienced while getting the trim dialed in is get it in the air hovoring and feel which way the nose is going. If you trim it on the ground, it will be different in the air. And make very small adjustments. Also, your trim will change during flight because the battery is dis-charging. Now if you get yourself a 3-cell lipo battery and change to a 9t pinion, you won't be fighting the trim as much.

that's my (beginner) advice.

Kdog
06-15-2006 Over year old.
 
 
phlat
Heliman
Location: Canton, GA - USA

I've got those videos and they've been a huge help.

One of the things I did after getting the cp and was having trouble getting off the ground was call e-Flite. They have a very nice support staff. I chatted with the rep for about 20 minutes about a number of the dynamics involved with this ranging from basic flight to battery charging.

Anyway, what he had said outright was that the bird's gyro and trims will not work properly when you're making direct contact with the ground. Basically the gyro is freaking out because there is another force being fed into the mix. His suggestion was to goose it up and try to get about 1ft off the ground. This would get it out of ground effect. My description of ground effect was like it was on a plateau and kept wanting to just slosh around. He said it was a perfect description and the only way to really get the bird to work right was get atleast a foot off the ground to eliminate ground effects.

Sorry for the digression. I guess what I'm after is that with the throttle down and trimming the T/C stick to 50% I'm getting some tail rotor activity which I wouldn't expect. I'll have to go look at cyclicpitcher's videos again as he did go into some detail on this.

thanks!
06-15-2006 Over year old.
HOMEPAGE  
 
 
Heli_J
Senior Heliman
Location: Kannapolis, NC - USA

on mine, oh im now into basic FF, anyhow when the battery is fresh charged i hover and bump the tail trim till its correct....then after about 5 min or so i return to hover and bump the trim back to the right a couple notches...

this is all i do and it works great....once the 4n1 is set dont mess with it cause you will never get it perfect...

try this tequnice...
julian

---> Blade CP, T-Rex, MX-400, QJ-8, QJ-16 No Gass, only Electric!
06-15-2006 Over year old.
 
 
Skiddz
Veteran
Location: Carlsbad, CA

Get the heli up around 2-3' to get out of ground effect to check out your adjustments. Ground effect hover doesn't require as much power as out of ground effect so the torque on the mains will be lower and therefor the TR won't be working so hard down low. Ground effect is going to be most pronouced 1 to 1-1/2 rotor diameters above the surface. you'll need to be 20" to 30" (roughly) high to get out of the effects. Of course, this is assuming no wind or very very little. It doesn't take much wind to get these little helis into translational lift.

Up out of ground effect will allow a more "accurate" (for lack of a better term) setting for the proportional mixing. Just remember, this isn't a nice HH gyro like the 401 and it'll take a while to get it dialed in. It took me almost an entire day and probably 6 battery cycles of 20+ minutes each to get mine dialed in. I set mine up in my living room and in low to no wind I can 1 hand hover for several minutes. With any other wind all bets are off.

A helicopter is 10,000 parts spinning rapidly around an oil leak.
06-16-2006 Over year old.
 
 
lryansl
Senior Heliman
Location: Yuma, Arizona

I made this up yesterday using some bearings from old blade grips so that i could adjust the tail on my 9c Super, works great now im able to adjust the revo and trims on the rudder.
http://users.adelphia.net/~mstatig/DSCF0526.JPG
06-16-2006 Over year old.
 
 
slider46
rrProfessor
Location: Gloversville, NY

I would agree with the others here, get the heli up 3' and see what the tail does and adjust the heli to get it as close as you can.. These little birds fly great when you get the tail dialed in correctly but it takes time and alot of short hops to 3' and land to adjust. Make sure you disconnect the battery every time you make a change to the pots....

Tom..... No "D" flying....
06-16-2006 Over year old.
 
 
Skiddz
Veteran
Location: Carlsbad, CA

lryansl,

That's pretty cool.. I've got a couple tripods lying around I haven't used in a long long time.. Maybe I'll cobble something up like that and see if I can really dial in the CP's ass-end.

A helicopter is 10,000 parts spinning rapidly around an oil leak.
06-16-2006 Over year old.
 
 
TRex4life
Veteran
Location: Phoenix AZ

and he says it again, ground effect does exist, I KNEW IT



As they said, get it up about 2-3 feet in the air and then do minor trims, because with "ground effect" smacking the heli around its not the same once its outta that zone.
06-16-2006 Over year old.
 
 
lryansl
Senior Heliman
Location: Yuma, Arizona

Skiddz,

Its helped me a lot now i can adjust things while im watching what happens not having to keep my eyes on the controls and heli concentrating on avoiding a crash, if your interest ill post a couple pics on how i made it up. And maybe a short video clip on how it works.
06-16-2006 Over year old.
 
 
Skiddz
Veteran
Location: Carlsbad, CA

Quote 
and he says it again, ground effect does exist, I KNEW IT


sigh... what an ignorant tool you are.

lryansl,

some detail pics would be cool, no video necessary.

A helicopter is 10,000 parts spinning rapidly around an oil leak.
06-16-2006 Over year old.
 
 
lryansl
Senior Heliman
Location: Yuma, Arizona

Skiddz i sent you a pm check it out.
06-17-2006 Over year old.
 
 
Skiddz
Veteran
Location: Carlsbad, CA

Got it.. Too many margaritas and beers to decipher right now. (Nephew graduated high shool today and he and his buddies tried to out drink me. lol. His buddies are pukin' and he's out cold. hehehe)

I'll have a look tomorrow...

A helicopter is 10,000 parts spinning rapidly around an oil leak.
06-17-2006 Over year old.
 
 
NoVNE
Senior Heliman
Location: normally N Attleboro, MA currently Kuwait

PUI, always entertaining.

Thad
06-17-2006 Over year old.
HOMEPAGE  
 
 
Skiddz
Veteran
Location: Carlsbad, CA

OK, so I slept off last night's lesson and took a look at the pics. Seems pretty straightforward and I've got an idea on how to make one out of aluminum stock. When work slows down a bit I'll get some time on the mill and make one up..

Thanks for the idea lryansl!

A helicopter is 10,000 parts spinning rapidly around an oil leak.
06-17-2006 Over year old.
 
 
lryansl
Senior Heliman
Location: Yuma, Arizona

Ya no prob aluminum sounds like it would be better then wood for sure, I came up with the idea two days ago and just threw it together in a couple hours and it worked beautifully and its helped me a whole bunch.
06-17-2006 Over year old.
 
 
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e-E-Flite Blade CP CX 400-3D > Trimming out the CP
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