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Old Dec 06, 2006, 07:24 PM
Registered User
smaland, sweden
Joined Dec 2005
106 Posts
Discussion
using ccpm mix on tail rudder surface on airplane?

The basic idea: using 120° angled tailplane surfaces mixed with ccpm mixer for elevator and rudder, but also to control aileron.

if you take a look at the tail on the F-4 Phantom you should get the idea

Ive been planning a long-term balsa project, and would like something technicly different..

i figured i could try a 3-wing zagi prehaps or some sort of canard-type craft, but the basic functionality has to be at least ok..
it could also be extended to a X-wing ie the famous starfighter

So i wonder, has anybody done something like this previously?
the mixing shouldnt be a problem, just got a futaba 9c.
but how are the flight-tendencies?

i will be building from scratch for the first time, so any helpful links/hints/suggestions would be great

Just got a Futaba 9C and a dedicated hobby-room with huge build-potential and i just MUST use it
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Old Dec 06, 2006, 08:49 PM
Ascended Master
Sparky Paul's Avatar
Palmdale, CA
Joined Oct 2000
13,376 Posts
CCPM involves 3 servos.. there's aileron, elevator, and throttle.
Moving the throttle moves the aileron and elevator at the -same- time.
You're better off using rudder-vator mixing for the horizontal, with aileron seperate.
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Old Dec 07, 2006, 04:37 AM
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Taipei Shek, Taiwan
Joined Aug 2004
458 Posts
Quote:
Originally Posted by XarvoX
i figured i could try a 3-wing zagi prehaps or some sort of canard-type craft, but the basic functionality has to be at least ok..
it could also be extended to a X-wing ie the famous starfighter
3-wing Zagi? You mean Lambda Shuttle, don't you? Give me a B-Wing, too!!!
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Old Dec 07, 2006, 05:35 AM
Registered User
smaland, sweden
Joined Dec 2005
106 Posts
with normal pitch-ajustment on standard ccpm, every servo goes the same direction.
Meaning, if you mount 3 servos for 3 surfaces and change pitch, you get aileron (screwing)
but since i dont want to change pitch with throttle-stick, i will still have to make my own mixers.

what im thinking of is a fully articulated flight behaviour with only 3 rudder surfaces, witch i think is the smaller of problems compaired to the tx mix..

and sparky, have a look at the align trex with ccpm, there´s 3 servos for cyclic plus throttle.. (left/right aileron+elevator)
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Old Dec 07, 2006, 09:48 AM
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Sparky Paul's Avatar
Palmdale, CA
Joined Oct 2000
13,376 Posts
Here's another unconventional airplane.
This is Tim's "Thing"... Cute but...
I can see using a CCPM transmitter on a vee-tail or elevon -glider-.. no motor.
I've set one up just to see if it would work.
The collective mixing screws things up.
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Old Dec 07, 2006, 10:41 AM
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Central California
Joined Aug 2003
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It's 4 channels isn't it?

Throttle, pitch, roll and elevator.

You could make that work using pitch to control main wing reflex, for example.
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Old Dec 07, 2006, 11:18 AM
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Palmdale, CA
Joined Oct 2000
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Quote:
Originally Posted by Ledbetter
It's 4 channels isn't it?

Throttle, pitch, roll and elevator.

You could make that work using pitch to control main wing reflex, for example.
.
Throttle and pitch on one stick.. the collective, in helicopter parlance.
Any movement of the collective moves the aileron (lateral cyclic) and elevator (pitch cyclic) in one direction at the same time in a CCPM system.
Moving the cyclic would move the elevons/ruddervators as well.
That's why I specified a glider. 2 channels.
Rudder (pedal) changes the tail rotor speed for yawing.
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Old Dec 07, 2006, 11:50 AM
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smaland, sweden
Joined Dec 2005
106 Posts
im sorry if im not clear enough in my description, i dont intend to use a stock ccpm mix, but to emulate one with a few free mixes. the result will move the Y-shaped tail-surfaces in much same fasion as a eccpm swashplate.

the idea is to attatch the servos in the same way on all surfaces so when all servos push/pull, i get aileron effect, when two move up/down i get elevator, and when 3 working together forms rudder.

i hope this straightens your questionmarks


the Lambda Shuttle seems like a good candidate
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