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10-13-2005 12:28 PM  12 years agoPost 1
3D-Novice

rrApprentice

ISRAEL

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I tried doing a search but couldnt find the info

what is HDE and what is CDE ( what does it stand for ?)

would it be better to buy the complete Align metal head udown to the swashplate, or get the basic kit and upgrades from aftermarket companies?

thanks for the help

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10-13-2005 01:11 PM  12 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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The acronyms HDE and CDE appear to be unique to Align. They refer to how the swashplate on the heli is controlled.

In an HDE system, each of the three swashplate axes are controlled by a single servo. One servo tilts the swash forward and backward, one servo tilts it left and right, a third servo moves the swashplate up and down to operate the collective pitch mechanism. the fore/aft and left/right inputs are at 90 degrees to each other.

In the CDE system, the swashplate movement is controlled by three servos acting in tandem. For fore/aft control, two servos move the rear of the swashplate up, while the third servo moves the front down. (and for the other direction, the same two servos move the rear down, while the third servo moves the front up). For left and right, two servos work in tandem to tilt the swashplate left and right. One moves up, the other moves down. The third servo does not move. To move the swashplate up and down for collective pitch control, all three servos move the same direction to move the swash up and down. In a CDE system, the inputs to the servo are generally 120 degrees apart, instead of 90 degrees. One ball on the swash is located along the nose - to - tail axis of the heli, the remaining two balls are 120 degrees away from this ball, one on each side of the heli (some helis place the swash balls at 140 degrees -- one in-line with the nose-to-tail axis, the remaining two balls 140 degrees from that ball, one on each side of the heli).

As to what the two terms actually stand for, I looked at the Align site and didn't find a good explanation. For what it's worth, Kyosho calls their equivalent of HDE "MMS" (for mechanical mixing system), and their equivalent of CDE "EMS" (for electronic mixing system).

Properly executed and set up, it is hard to tell the difference between the two systems in flight. In the smaller helis that are using micro servos, the CCPM (CDE) setup is most likely the better system to use, as the load presented by the swashplate on the small servos is shared by three servos, lessening the need for high torque servos.

Generically, the CDE setup has been referred to as "CCPM" (cyclic-collective pitch mixing) for about twenty years or so, and refers to a system where three servos are used in tandem to control the swash movement. Some have tried to be "more precise" and refer to this setup as eCCPM, the "e" standing for "electronic". They argue that all helis have cyclic-collective pitch mixing, and the "e" is needed to distinguish between the traditional method and the electronic method. Others claim that the CCPM setup refers only to helis that move the swashplate up and down for collective pitch (as opposed to the early Schluter machines that used a rod running in a slot in the MR shaft to operate the pitch mechanism). Historically, CCPM was coined to indicate that three servos work in tandem, mixed within the TX, to move the swashplate

Dave

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10-13-2005 02:26 PM  12 years agoPost 3
Gary Hoorn

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Annapolis Maryland USA

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3D-Novice,
How good a flyer are you right now? If proficient go ahead and "bling" up the Heli if you feel like it. The XL kits in either configuration fly just fine if built and setup properly and require no upgrades. I have a "blinger" and it does not fly any better than a bone stock bird. In fact it is slightly heavier because of all the metal...

Dave,
Great explanation. Mark should make that a "sticky" as often as the question comes up.
Gary

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10-13-2005 02:32 PM  12 years agoPost 4
3D-Novice

rrApprentice

ISRAEL

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is the carbon frams set from align a good 1 to buy ,or should i buy something else.

I fly mild 3d with notro 50/90 helis,

also which upgrades are better , the align head or microheli

from what ive read here, i should go with a mega 16 motor and jazz ESC
I see 90% are using the hitec 55 servos, how are they compared to the futaba. Is it just the cost difference, or are futaba better ?

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10-13-2005 04:51 PM  12 years agoPost 5
tisrich

rrApprentice

western NY

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I agree. Very informative post by Dave. Thanks.

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10-14-2005 12:38 AM  12 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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3DNovice

My advice would be to pick up either the CDE or the HDE version of the XL, build it and fly it stock. The stock kit is pretty good. Figure out if you like the heli before you dump a ton of money into it. This gives you the opportunity to figure out what needs to be replaced and you can do that later if you want to. Crashes with the T-Rex are always an opportunity to bling.

Dave

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10-14-2005 01:05 AM  12 years agoPost 7
joeskeeter

rrVeteran

South Georgia

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Great post Dave.
I'm trying to decide which one.

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10-14-2005 04:57 AM  12 years agoPost 8
dkshema

rrMaster

Cedar Rapids, IA

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If you buy either one -- if you want to try the other setup, parts are available and you can turn a CDE into an HDE or vice versa.

Dave

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