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Model Forum / Radio Controlled / Helicopters / January 2010



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Using Futaba 6 channel airplane radio for Helicopter

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buzz - 05 Jan 2010 03:02 GMT
Hi everybody. I am very new to this hobby and trying to find my way
without buying a bunch of worthless junk. I am researching the RC
helicopter hobby.
Maybe you can answer my question.

I want to use my Futaba Conquest 6 channel airplane radio to fly an RC
helicopter.

Ok, I know you going to tell me all kind of reasons why it's wrong,
but please read  first.
I have lots of stuff for building airplanes from park flyers to 3
meter electric gliders. 5 radios, receivers and servos of all sizes,
speed controls, and all kinds of batteries.

I am working part time and have to watch every dime.

WHEN I CONNECT MY SPEED CONTROL TO CHANNEL 6 (3 position switch) OF MY
FUTABA CONQUEST 6 CHANNEL RADIO, I GET; "OFF", "HALF SPEED", AND "FULL
SPEED".

So isn't this how real copters fly? Don't they power up the rotor and
then change the pitch to lift off the ground? So until I get a better
radio, why can't I power-up my motor to half or full speed and then
fly using ch 3 (L stick) for rotor pitch?. I would be pleased just to
lift off the ground and be able to go around in circles until I can
buy a real $200 Helicopter radio. Might be good practice.

What I am thinking is that I'll get a Bare Bones 450 kit, use my
current stuff as well as a cheap gyro, instead of just buying a co-
axle or fixed pitch helicopter that will break and be a waste of
money. I see these Bare Bones kits going for less than $50 and Gyros
for $30 or $40. I was hopping I could get into the hobby cheap and
then upgrade as I go.

If not, then is there a fixed pitch Bare Bones Kit that I can use my
equipment with that I can fly on 4 channels?

Thanks so much for taking the time to help answer my questions.
Larry
Robert Roland - 05 Jan 2010 22:28 GMT
>WHEN I CONNECT MY SPEED CONTROL TO CHANNEL 6 (3 position switch) OF MY
>FUTABA CONQUEST 6 CHANNEL RADIO, I GET; "OFF", "HALF SPEED", AND "FULL
>SPEED".
>
>So isn't this how real copters fly? Don't they power up the rotor and
>then change the pitch to lift off the ground?

Not quite. The rotor does (should, at least) keep a constant RPM, but
that is achieved by balancing throttle and collective pitch. As you
add more collective to climb, the rotor needs more power to maintain
constant head speed. As you reduce collective to descend, you must
reduce throttle to avoid overspeeding the rotor.

>So until I get a better
>radio, why can't I power-up my motor to half or full speed and then
>fly using ch 3 (L stick) for rotor pitch?.

Because your rotor would be bogging down as you climb and/or
overspeeding as you descend. There are devices called governors, which
read the head speed and adjust throttle to maintain proper head speed.
In principle, I can see no problem using one of those to solve your
problem, but they're not cheap.

>I would be pleased just to
>lift off the ground and be able to go around in circles until I can
>buy a real $200 Helicopter radio. Might be good practice.

In that case, you could probably drive both collective and throttle
off the same servo. Setting it up would be a lot more work than with a
computer radio, but it is entirely possible. According to Ray
Hostetler in his book "Ray's Complete Helicopter Manual", it is not as
complicated as it may sound.

>What I am thinking is that I'll get a Bare Bones 450 kit,

That would be an electric, then? That changes the situation slightly.
Electric motors have the nice property that they increase torque (and
therefore power) as the load increases. Also, they have a built-in
maximum speed defined by the motor's "KV" rating and the battery
voltage, so overspeeding is less of a problem. In fact, many pilots
set their idle-up throttle curve to 100% all over the stick range.

Be aware of one other problem, though: Many helicopters these days
need an electronic collective-cyclic-pitch-mixer. Your radio does not
have such a mixer, so make sure you get a heli that does not need one.
I fear you may run into big difficulties finding a 450 sized machine
with mechanical CCPM.
Signature

RoRo

 
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