Dragonfly can be converted to Belt drive Tail ? Yes, Come on, we can do...? - RC Groups
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Mar 18, 2005, 10:54 PM
flying thing
lostrider's Avatar

Dragonfly can be converted to Belt drive Tail ? Yes, Come on, we can do...?

Hi all,
anybody tried this?
i think, it must be possible,
- with pha-01,
- not another esc,
- but adding a servo for controlling tail prop angle,
- and tail prop angle shaft system, + belt drive to the mainmotor

if this conversion completed succesfully, dragonfly will be good,
i dont like this separate tail motor system, and its freaky workin.
300 stock motor will be enough for all power? with li-poly it seems possible and cool,
i think, power consumption is must be equal, or better than seperate..
any comments please,
i must do this thing, because im bored
- sorry for my poor english..
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Mar 18, 2005, 11:00 PM
Registered User
This was discussed a lot about three years ago.

If you search through old messages you will find that Mario had designed a belt drive system and was trying to get enough people to preorder so he could manufacture it.

One problem with main-motor driven tails on FP helis is when you throttle down, the tail rotor loses authority, so I think motorized tails are probably better for FP helis.

Mar 18, 2005, 11:01 PM
flying thing
lostrider's Avatar

Clutch system?

adding a clutch included belt drive system is possible;
with non-geared belt system
so we dont need a tail prop mechanics, fixed tail prop, and clutch belt drive system,
i need find anything for making this belt.. or invert an a belt to non-geared side
Mar 18, 2005, 11:03 PM
flying thing
lostrider's Avatar

yes but it must not be fixed-speed or fixed-mechanics?

yes but it must not be fixed-speed or fixed-mechanics?
Mar 18, 2005, 11:59 PM
Registered User
Why do you want a clutch?

There's no need to stop the tail rotor.

Mar 19, 2005, 12:03 AM
flying thing
lostrider's Avatar
clutch for speed coupling, for tail speed control,
no tail mechanics, fixed tail propellers & coupling clutch to toothless belt drive<->ballbearing,
servo controled belt tightness
Mar 19, 2005, 12:31 AM
some guys never learn...
sounds like your trying to complicate a simple system, a clutch, fixed pitch prop? If it's gonna work your gonna need some input from a gyro, Belt tension is a thought, but may be way to sensitive to control. It would be easiest to stick with what has been done already, a working TR hub, then adapt your belt drive to it.
Mar 19, 2005, 12:41 AM
flying thing
lostrider's Avatar


yes, but its dragonfly
so, we; dragonfly users need some mechanic too,
and i think,
+ it must better than toothed-pitched belt drive system,
+ this thing dont have this problem: wasting your tail gears
+ less tail weight
+ no belt breaking,
+ stabil tail propellers

when i have spare time, i will try this,
only need,
pha-01 must be controlling an a servo, no extra esc

any ideas for connection schema?
Mar 19, 2005, 12:48 AM
Its all fun
Tonystott's Avatar
I think it would be an easier task to convince fliers to all change to the same mode!

I think also that insisting on using a PHA-01 is making life unnecessarily difficult.

If you really need to have a driven tail, it would be way cheaper to buy a 22D and spend the effort debugging it.

Sorry, but I just don't see the justification when there are so many other heli designs out there which can be picked up so cheaply.
Mar 19, 2005, 12:51 AM
flying thing
lostrider's Avatar

you right, but me too

you right, but me too,
i have this heli allready,
so i need mods on this,
can u give me 22d for free?
Mar 19, 2005, 12:53 AM
flying thing
lostrider's Avatar
and i dont like 22d's and others tail systems,
i see, driven tail users have many problems with tail systems,
so i try to find better
Mar 19, 2005, 01:19 AM
flying thing
lostrider's Avatar
an a sketch
Mar 19, 2005, 03:27 AM
Its all fun
Tonystott's Avatar
If the idea is to adjust the tension to adjust the tail speed, the belt is going to melt!
Mar 19, 2005, 09:43 AM
flying thing
lostrider's Avatar
than it can be a shaft&wheel
Mar 19, 2005, 01:27 PM
That tree again!!!!
thanhTran's Avatar
Hi Lostrider,

Why do you want to adjust the belt tension? Usually the belt tension is fixed and there is a servo used to adjust the angle of the tail blade by pulling / pushing a tail pitch slider which in turn changes the pitch of the tail blades to increase or decrease the force generated by the tail rotor.

Does PHA-1 have an output to connect to tail servor? I think it has only 2 motors output right? Or do you have an extra servo channel from your radio?

I don't like seperate tail system either. When I was using seperate set up with a piccolo V2, the tail rotor still kept running by itself even when the main motor has stopped (throttle 0, but the rudder was 50). That tiny tail rotor hit my eye lid and I was so mad because of that incident.

I think the problem with dragonfly is that it's small and light. A tail belt system requires a bigger boom and a belt. That's heavier than the stock boom. ALso nontooth belt may slip during run if you dont' have enough tension so that may cause loosing tail authority. Don't under estimate it, the tail gear & tail rotor shaft of shogun slip lots of time. Loosing tail authority in fly is bad as you could crash easily . I have the tail rotor & its shaft flew off its holder and its gear a few times. Those were really nasty crashes

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