Blade CP Pro - Going separate

[NorFlyer79]

Hi everyone, I have a question about going separate on a Blade CP Pro.

I've got the G90 Gyro upgrade, and the brushless Park 370 mod. The next step is to install the DD-tail. Can I remove the stock 3-in-1 unit, and use a separate speed controller for the tail rotor motor (like the GWS ICS100), while still using the stock 72MHz receiver?
How do I provide battery power to the receiver? Re-enable the BEC function on the brushless speed controller?

Thanks for reading.

[rabidguineapig]

You need a Y splitter between the two esc's the tail and the main on the battery. Just use deans plugs with one male split to two female to power the two. Don't use the bec, you can have all kinds of problems with them

[static80]

I've eliminated the 3 in 1 completely. gyro plugs into rudder channel, tail esc plugs into gyro. I, only have the ground and signal wires hooked up on the tail esc and am using the bec on my main motor speed control.

It took me a bit to get the direction right on my tail motor, but it works pretty good now

[NorFlyer79]

Thanks or your replies. I tried to hook it up today, and it seems to be working, but I didn't have time enough to test fly it. I have a question though. I read "the GOOD setup" thread, and saw that he was using Spectrum with the AR6100 receiver.

Lets say that you are hovering, and then you give some more collective on your TX. The rotor spins faster/pitch increases, and the rotational force tries to turn the nose of the helicopter in the opposite direction. The gyro picks this movement up, and tries to stop this nose motion by adding more thrust to the tail motor.

Or: Does the TX send a signal like "I'm going to increase the collective, you better give some more juice to the tail motor to compensate before the motion even happens", in addition to the gyro of course.

Is this how it works? Or is this the difference between the cheap stock TX/RX system vs. a more advanced system like the Spectrum.

Hope you guys understand what I mean. English is (obviously) not my first language :-)

[static80]

On my DX6i there is an option called Revo mixing. You'd use this if you were hooking up to a gyro in rate mode. It basically mixes the tail motor as a slave to the collective channell. So you set up ratios for a few stick positions and the tail should automatically be at the right speed for any throttle position. This is like your second scenario.

Now with a heading hold gyro I'm not using any radio mixing between the collective and the tail motor. The gyro is doing all the wok just like in your first scenario. I find for spinning up I have to hold a bit of right yaw, until the heli get's really light on it's skids and the gyro has enough control to take over. When I punch the collective, the nose will twitch to the left, but quickly correct itsellf.

Hope this helps

[NorFlyer79]

Thanks for the answer static80! Exactly what I was looking for.

I tested my newly modified CP today, and the DD tail with the CN12 motor was awesome! No nose-yaw movement when I kicked the collective up. :thumbup:

The downside: I only flew for a couple of minutes, had a hard landing (on the skids), and the motor stopped. :thinking

I was about to examine what was going on, and i burnt my finger on the motor.. it was extremely hot! I'm using the cooling fin.. Has anyone tried a brushless tail motor, or is it overkill?

(Two CN12's are on order)

[static80]

Just an idea, but what prop are you using? I'm using the 0320 props, and don't get too hot. To big of a prop or too much pitch may be a reason for the motor overheating.

I've seen a few posts about brushless tail motor conversions using http://www.feigao.com/sdp/85838/4/pd-102732/1542982-51426.html

seems like it could get expensive fast for this little heli

http://www.rcgroups.com/forums/showthread.php?t=855814 is another idea, but seems like it would get heavy and expensive pretty quick.

[NorFlyer79]

I was using the GWS 4530 prop with adapter as described here: http://www.helifreak.com/showthread.php?t=32108

Tried my 2. nd motor yesterday, and it lasted about 3 minutes before it started loosing power, and burnt out. It is installed with cooling fins as in the picture.

I've gone back to stock tail for now. Looks like I have to stick with that.. :(

[static80]

I think if you go with a smaller gws prop, like the 0320 you should be fine, I have probably 50 flights on mine with no heat sink and still no problems. the prop looks tiny though, only 3 inches tip to tip. Another thing to watch for is having your gain set too high. I set mine up too high this weekend and could hear the tail motor cycling between full and 0 very quickly in a constant search for center.

[rabidguineapig]

Definitely go with the GWS motor, the brushless motors are way too heavy for the tail. The GWS is more than enough, or you can look into a belt drive tail for the CP which is by far the better way to go. You have to look around for it, I'll see if I can find a link...

[buildem336]

Brushless tail is the only way to go it holds as good as any belt driven and no brushes to wear out. I would stay away from a belt conversion on a cp pro too much money more weight and the belt will rob you of alot of power. Check out my pro with brushless tail.

http://www.youtube.com/watch?v=YbCLylSm-OI

[carlo_the_wonder_frog]

Not quite as good as a belt driven, but pretty good.