2 Servo CCPM

[John Boy]

Getting my Eco 8 ready to fly and have a couple questions. I plan on using a MMR with 10 1250 scr's. (trying to decide which speed controller now...)

Has anyone used the 2 servo CCPM with their Eco? Using 2 Hitec HS-85 servos should have plenty of grunt for a 2 lb. copter.

Let me know if anyone has tried this and what servos you used...

Thanks in advance

John Boy

[John Boy]

I forgot to ask which blades to use. Dymond Motor sports has (3) carbon blades listed:
62185 Carbon Glass Heli Blade, Eco 8 and .30 size, 18.5" $59.95
62186 Carbon Glass Heli Blade, 22.5" $69.95
62187 Carbon Glass Heli Blade, 27" $85.90

For a very light, aerobatic eco 8 using MMR, which blade would seem best?

Thanks

John Boy

[Todd Sheehan]

How are your servos mounted?? Is the elevator on the side frame and the aileron on the main plate in front of the motor using some kind of bell crank system?

Why not us 3 servos and the CCPM?

Sorry, I don't have any experience with the carbon blades. Please let me know if you get some. Call up Dymond and talk with Helmut. He has a lot of experience with the Eco, as he flies it himself, and can surely give you good accurate advice.

I use the JETi 50a speed controller. It's outstanding and can power all your equipment with the BEC! It's analog, not digital, which is very good in case of Helicopters. You wont get any interfience that will shut the motor of/ or have to "reset" the controller. Dymond has the best price on these controllers!

Good luck!

[John Boy]

Thanks for the info...!

The reason for 2 servos instead of 3 is really weight. Mount the 2 normally for roll and elevator using the 2 servo mix for ccpm (leave out the 2nd roll servo), using the 90 degree swashplate, the second roll servo (with 3 servo ccpm) is only doing the reverse of the other roll servo. With the swashplate fitting the main shaft so well, that 2nd servo on roll is not doing much.

If I purchase the alum swashplate, the 3 servo 120 degree ccpm would be the best... (but costs money and adds weight...)

I'm trying to keep the Eco as lite as I can to overcome the MMR lower power for 3d flight. I am looking at the JETi 50a speed controller.

Thanks Todd

John L.

[Marbaise Philippe]

Not sure your 2 servo solution will work.
You will get Heli-samba instead...

How will you handle the collective pitch with only two points.
The Eco8 is not a fixed pitch helicopter.

The swashplate should move:
- up and down for collective pitch.
- left and right for the roll motion.
- back and forward for the nick motion.

You are going in big trouble if you fix your swash plate only with two points...

I got a friend who once fly a concept 30 and one of the three link broke. He landed the heli in one piece but this was purely by luck! But we were all amazed of what mouvement an heli with such a problem can do.

Hope this will you prevents you from buying a new kit after your crash.

Philippe

[Todd Sheehan]

I agree. How will you be able to change the pitch with two servos???

I have the 90 degree standard swash plate, 3 servos and CCPM. It's MUCH better than using the mechanical mixer, but told not as nice as the aluminum 120 degree plate.

The MMR on 10 cells is a great combo! Great for flying around. I have yet to do any aerobatics, but will feel ready soon.

Todd

[Sture Smidt]

I use the aluminium swash plate with 90 degrees CCPM.

See: www.komtek.no/fly/fly.htm (http://www.komtek.no/fly/fly.htm) and click on the Helicopter button. Then click on the hyperlink "experiences" at the lower part of the page.

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Sture Smidt
RC Pilot
Norway