I have my CPP2 set up on my DX7SE and have a couple questions.

When setting up my collective, my pitch needs to be set around 30 or it maxes out the range. Is this normal or do I have something set up wrong? Travel adjust are all set at 100%.

How do you go about setting up AIL and ELE in collective? Should I just set it around the same as pitch? Right now she is quite twitchy on cyclic.

Thanks for any help.

When I had my CPP I think my swashmix for pitch was around 30% also. You also have to watch out with a max pos or neg pitch(I can't remember which one) the flybar will lock up, so the pitch needs to be a little lower so the flybar can move a little.

If your swash is level through its full travel the AILE and ELEV swashmixes should be the same, but might be different than the PIT swashmix. How I set mine up is move the collective to get 0 degrees of pitch. Then with the blades parallel to the boom move the aileron to the max and adjust the AILE swashmix until you get 9-10 degrees of pitch. Then you can check the elevator by moving the blades perpendicular to the boom and move the elevator to the max. If the cyclic is to fast for you then you can move AILE and ELEV both down the same amount until you like the way it flies.

Nick

I just did my first setup of my BCPP2 with my DX7 and the first thing I have to say is: DO NOT FOLLOW CPP1 DIRECTIONS.
For some reason, they are quite different. My LHS DX7 guru helped me get started on the setup or I wouldn't have been able to fly it at all with the DX7.
So, without answering your question directly, I'll give you what I have done in the regular setup

System Setup: Swash type: 3 servos 120degrees

Function Setup: First, I'm not giving you the D/R stuff because that is for you (and me) to experiment with
REVERSING: This is important as it disagrees with the CP/P settings
Ch 2,4 reversed, all others normal (INCLUDING 3-ELEV)

I left Travel Adjust at 100 on everything for now.
SWASH MIX - again, disagrees with CPP1. ALso, you can tweak these numbers to your preference but NOT THE SIGN, that is important as it takes care of the not-reversed Elevator
AILE = (+) 60
ELEV = (-) 70
PIT. = (-) 20
I did these settings because the CPP2 manual said the pitch should be -2 at 50% throttle and about 10 at full throttle. I used a pitch guage to be sure. I am uncertain I got the -2 but at least got it down close. Elevator and Aileron are subjective and could probably be smaller if it is too squirrelly or larger if you are used to this heli.

THRO HOLD - your option but it sure helps me!
HOLD POS = -5.0 (0 is not enough)
SW: AUX2 but GEAR is ok if you like that switch better. Just remember that SERVO needs the other one if you are going to adjust it via the Tx

THRO CURVE - I thought that linear would be ok on this but turns out I need more throttle by the time lift starts. You can leave it linear and fiddle later but here's what I've got (though I'm still playing). CPP2 manual was my reference
Point-L = 0
POint-1 = 34
Point-2 = 70 (this is the half-stick point)
Point-3 = 86
Point-H = 100%
EXP=OFF

PITCH CURVE - again, the CPP2 manual gives its own diagram so I used it to start.
Point-L = 0
Point-1 = 0
Point-2 = 2 (Lift just starts at 50%)
Point-3 = INH
Point-H = 100
EXP = OFF

I'm not sure I like this setting but am working on it. This way I just start getting lift at 70% throttle

PITCH CURVE - HOLD
Set all to 0.0% if you're using Throttle Hold unless you want to play with an Auto-Rotation gear

Hope these help you get started. I had a hard time getting some help so I'm no expert either. But this works enough to get into a stable hover. Good Luck!

I have been flying my CPP2 with the DX7se and was curious about the major difference in collective. I am guessing the factory TX for the CPP2 has some major adjustments programmed to fly this thing.

A couple notes on your setup.

Pitch should always be zero at 50% throttle and should have the same range up and down. If it is set up differently, inverted flying will be off.

Throttle should be linear in NORM. STUNT 1 and 2 can be whatever you like. Probably 100-90-80-90-100 and 100-100-100-100-100

Your pitch curve should be somewhat light on negative pitch in NORM and linear in STUNT 1 and 2. The pitch curve should always be 50% at mid stick. This is again for inverted flying.

I have two CPP2s and I will be working on getting the settings on the DX7se spot on for the factory TX.

Hooray! Someone else is working on this! I swear that I've begun thinking the CPP2 is being treated as a pariah by both former CPx fliers and by the company that released it!

Just wanted to respond to your comments, quickly.
I offered no inverted flight recommendations (i.e. no data on ST1 and ST2 settings). I did create them as you suggest but I'm just not doing inverted yet so that has been less of an issue. I'm fiddling a little with Dual Rate settings for Aileron and Elevator (putting in some exponential - around 40%) but so far I just like linear. It is too windy here in Denver to fly just yet so this is all garage hovering observation.
Yes, you are right that the stock Tx sets pitch for Normal mode to begin positive at 50% stick. However, I've been trying to work around some limitations. For one, the zero in the pitch curve implies zero pitch. Hence, the adjustments don't start at -2% below 50% stick. One of the things I've been doing is to try to get the pitch adjustments such that there is a minor negative value at zero pitch, so I can throttle up higher without lifting off. Hence the +2 at 50% stick is really (I hope) the equivalent of zero measured pitch on the blades (I've been using a pitch guage to dial this in). If I start doing inverted flight, then I might have to add some pitch to the servo (not sure yet) and readjust. I've played a little with ST1 and note that at 1/2 stick, it is definitely at a higher throttle and pitch setting than the NORM mode, which is not what the graphs would imply.
As to throttle. If you'll note the CPP2 manual (Page 40), the Throttle settings really aren't linear for the NORM mode. First quarter of a stick goes up to 45% throttle. At half a stick, throttle is about 65%. 3/4 stick is 75% and fully stick is 100. I've been starting from that diagram and putting little adjustments into it to suite my habits. First, I keep throttle a little lower at 1/4 stick because this is the area I'm letting the blades and flybar get settled. Second, I like a little higher throttle at half stick so I get a little more stability at lift-off pitches. Also, I'm noticing that the ratings of power are not quite exact so I tweaked a little higher. It is not a recommendation but since I don't think I have a dual rate for throttle then I cut myself a little slack there. Also, trim on throttle would be an option to increase power. I haven't yet gotten comfortable with these trim adjusters yet. Once I do, I'll probably tune it back down to normal.

Glad you're making progress on this as well. Once you get the exact settings as the stock Tx, let me know if it flies the same and I'd like to see what you come up with. We seem to be 'bleeding edge' on this one. This is my first CP Heli and my first one purchased in its initial release. I'm surprised at how little support there is on it if it is even a little different from the old CP's.

BTW, have you had to replace a tail rotor blade yet? They won't have stock parts until June, I'm told, so be careful with the tail motor. Until I get real tail rotor blades, my GYRO is not holding as much as I would have liked. I plugged in the yellow plug into GEAR to test the DX7's ability to control the GYRO but took it off when I started having other problems. I'll try again later.

whoami1,

I was confused as to what you were saying about the throttle curve till I looked at the book. You are correct that they seem to have turned the speed up a bit. It looks to me like: 0-45-65-75-100 for NORM.

I am really confused as to what you listed as your pitch curve. Pitch for NORM is listed in the book as degrees so in percentages, the curve should be approximately 40-45-50-75-100. This will give you a little over 2° negative pitch throttle off.... 0° pitch at 50% throttle....... 12° pitch at 100% throttle. The reason you are light on negative pitch in NORM is so that you have better control during lift off and landings. It is also to keep you from driving your heli into the ground if chop the throttle.

Pitch curves for ST1 and ST2 need to be linear. 0-25-50-75-100. This will ensure that your pitch at 50% throttle or more is exactly the same in STUNT as it is in NORM. For inverted flight and 3D, you need the negative pitch to match the positive pitch.

Throttle curve for ST1 at the minimum should be 100-75-65-75-100 to match the NORM throttle curve but normally people like a bit more head speed / power for 3D. I would say 100-90-80-90-100 on ST1 and 100-100-100-100-100 on ST2.

Sorry for the delay. And thanks for the patience!
You are confused for a good reason. After I began formulating an answer, I realized that I needed to get more details on the configuration. During the experimentation, I realized that my setup worked okay but only for the NORM normal mode. When I tried to do the setup for the ST stunt modes I realized that I wasn't getting any negative pitch. Fine if I never intend to use it but I know that was one thing you were working on. So here's what I discovered:
The pitch wasn't going negative because the SWASH MIX was way too low on the Pitch component. It went positive ok but only for about +10 degrees at maximum when I had the pitch curve heavily tweaked. The ST mode pitch curves never developed negative pitch.

So I started to experiment again and I've come up with a SWASH MIX the gave more to pitch. Also, to keep AILE and ELEV at an even keel, I turned them down. Again, this is after fiddling for a day and is subject to change but I have
AILE (+) 60
ELEV (-) 60
PIT. (-) 50

I had a higher value for pitch (-70) but discovered that, while I could get it to work for 50% stick = zero pitch, the resulting performance was VERY hot, beyond my tolerance (it went from no lift to jumping 5 feet instantly). So I reduced it a bit and then did the pitch curve trying to find the level where pitch was really zero. Unfortunately, that is NOT at 50% stick. But at least I'm a little closer and might change things as I get more bold in Stunt Modes. Right now, I'm just happy I got -2 degrees pitch in NORM mode.

NORM pitch curve
Point-L 29% (about -2 degrees
Point-1 29
Point-2 35.5 (about zero pitch)
Point-3 INH
Point-H 100
EXP OFF (The LHS guru said he didn't recommend expo so I'll get comfortable without them for the moment).

Now one of the side effects of a reduced PIT. in SWASH MIX, the zero pitch is not at 50. So I have to depart slightly from the linear 0-100 setting. I set the mid point Point-2 at 37 (for some reason, zero pitch is just a little different between NORM and ST). All others are default. This lets me get the same lift and throttle when switching from normal to stunt. I haven't tried this in flight, mind you. Just holding on for dear life to the model on the workbench.

Throttle curves are unchanged and about what you use (though I'm tweaking my 50% stick throttle in NORM to about 70% so I get a little more stability - that is also why the lift is a bit twitchy so that might change.....)

Let me know if this is a little closer to what you expected. I flew it as a test and that's when I discovered I needed a little more gradual lift on takeoff (busted my skid support on the frame). If I keep having to replace the frame, I just might investigate the SUPER-SKIDS.com . The skids are expensive ($25) compared to regular skids but when combined with full rebuilds to replace the frame, my time is getting a little more valuable. Then again, maybe I just need to get a lighter touch.

BTW, I've been trying out exponentials in the aileron and elevator in the Dual Rate switches. Actually using negative EXP (-25%) to try to get more sensitive than the linear mode. This is for experimentation only. I've got two flybar weights on each side, which slows things down a bit and the EXP puts it back - even LHS guru thinks this is silly but I know I am still a little to overreactive when things go bad.

OK.. today I am on a mission to get the DX7se settings tweaked to fly the CPP2 the same as the factory HP6DSM. Right now I have pitch set up according to factory specs but ELE and AIL need to be set correctly. Once collective is set up correctly, I will work on EXPO to get the "feel" of the HP6DSM using the DX7se.

I have my trusty CPP2 that I have been flying for a couple months on the HP6DSM now bound and flying with my DX7se. I also have a brand spanking new in the box CPP2 RTF.



The first thing I did was set up the new CPP2 for flight. I do not like the rubber band method of holding the battery in place so I purchased a set of Velcro battery straps for a Blade 400 and use that instead. Simply remove the rubber bands and then loop the B400 straps around the battery tray and trim it to fit the battery.





I took the new CPP2 for a flight and it actually flies quite well straight out of the box. It needed two clicks back cyclic, two clicks left cyclic and two clicks right rudder and it would hover hands off for a couple seconds at a time. Rotor speed seems a little slow but this was also the case with my original CPP2 due to too much positive pitch. Rotor tracking is about 1/8" off.

Now that I have evaluated it in "out of the box" form, I need to set it up properly to be able to accurately measurements for the DX7se setup on the original heli. This will include setting pitch to ZERO at mid stick and equalizing pitch travel. According to factory specs, I should be have about 12° of pos and neg pitch in STUNT mode. There are no factory specs on cyclic pitch, so these are the ones I need to measure to accurately set up collective on the DX7se.

*UPDATE*

I was trying to figure out a way to determine 50% throttle on the HP6DSM. I decided to view the TX from the side and position the throttle so the stick was positioned identically to the cyclic stick.

In this position, factory pitch was spot on for 0° in STUNT mode. I got 11° of pos at 100% throttle and 11° neg pitch at 0% throttle. This is a bit short of the factory rating of 12° but I can see that there is more swash movement available which I will explore with the DX7se. I then measured cyclic pitch at 50% throttle. Forward, backward, left and right all measured at about 7°.

The odd thing is when I went to check pitch in NORM mode. At 50% throttle, I switched from F1 to F0 and pitch changed. I measured pitch and found that pitch was now 1° positive at 50%. I had to move throttle up to aprox 60% throttle to get pitch to stay the same in both NORM and STUNT. 0% throttle was 2° neg pitch and 100% throttle was 11° pos.

Based on the differences in pitch between F0 and F1, I would say that true center stick is off on this TX. Because collective is centered in F1, I am not going to adjust the head of this heli.

So the specs I am going to go with are: 11° of pos and neg pitch and 7° of pitch on cyclic.

My final DX7se settings to get swash operating correctly and to obtain factory pitch range are:

Swash Mix
AIL -65 (gives me 7° pitch L and R)
ELE +70 (gives me 7° pitch F and B)
PIT +30 (gives me 11° pitch pos and neg in ST1 and ST2)

Servo Reversing
ELE, RUD and PIT all Reversed (the rest Normal)

I am running a linear throttle curve in NORMAL mode and it seems as if I have more head speed than my CPP2 using the factory HP6DSM. I will need a tach to verify though. Factory calls for a more aggressive throttle curve than what I am running. I am a bit confused on this one.

Pitch curve in NORMAL is 35% 42.5% 50% 75% 100%

I have EXPO for AIL and ELE set at +20% and it is flying pretty well. I might turn this down just a touch.

I want to fly each again and evaluate the perceived head speed differences and flight characteristics.

I've just got to ask what may be an obvious question. But it appears you have reversed the opposite channels that I've reversed. Also, you have negative servo mix where mine are positive (I reverse 2,4 which are AIL, PIT). Ok, but they both work so I have to assume that both settings are ok. At least up to a point.
Because I don't understand the difference (and because my LHS guru setup my Normal/Reverse settings for me before I started altering Swash Mix), could you tell me if there is any compelling reason to use one method over the other?
I think I'll setup a new model and use your settings and see how they affect the flight.