diabolo 600

[chris-green]

anyone else planning to get the diabolo 600 ? whats your planned setup ?

planning on a super light 6s setup myself

[trillian]

Have you seen any weight specs on it? The Diabolo 550 is amazingly light, to the point that I really don't know how they did it.

In any case I'm sure the 600 will work well on 6s.

[chris-green]

It's quite a bit heavier than the 550.
700grams more which might make me think again
That said it would only be 3.6kg ready to fly 6s
So not that bad
Specs below
Technical specifications
Rotor diameter: 1.35-1.42m (blade length: 600-625mm)
Weight ready to go without battery: from 2,8 kg
Two-stage, quiet running helical-toothed spur gear
Smooth belt drive of the tail rotor
Quick-change system for toothed belt (DBGM)
All gears easily interchangeable
Rear rotor diameter: 280 mm (blade length: 100mm)
Length with hood: 121 cm
Length without hood: 106 cm
Height: 32 cm
Sled width 18 cm
Hanging accupack with hook-and-loop bands for high center of gravity
Battery: 62 mm high, 52 mm wide

[trillian]

OK, that puts it at roughly the same weight as the Kasama Dune which comes out at about 3.45kg with a 4000mah pack and would be around 3.6 with a 5000mah pack (less with something like a zippy compact). What I have discovered in my low headspeed experiments is that basically running a high Kv motor and taller gear ratio has a few advantages, so I suspect the two stage drivetrain will allow it to work better than the Dune on 6s.

I think my headspeed on the Dune is about 1700/1750 and it flies very well and doesn't hit the packs too hard. But the gearing is fixed at 9.63 to 1. I'm using a 730mx/850.

If you can get gear ratios similar to the bigger Diabolo then you could run an 1100/1200 Kv motor.

[chris-green]

expected gear ratio for planned setup should be 11.53:1 hope to use kontronik pyro 650-1030 and kontronik helijive aiming for around 1500/1600 headspeed

[acidla]

I like the way you can change the tail belt. Super fast and easy, great invention from Gerd.

[trillian]

I think that should work really well. With my Triabolo I fitted a 13 tooth TDR pinion (roughly 15 to 1 overall ratio) a 530Kv Pyro 700 and it works brilliantly. Headspeed is right around 1300/1400 ish. It's 12s but this is a big heavy heli and the three blades total 488 grams.

expected gear ratio for planned setup should be 11.53:1 hope to use kontronik pyro 650-1030 and kontronik helijive aiming for around 1500/1600 headspeed

[chris-green]

I did here about it ,yet to see any pics of the setup

[chris-green]

I think that should work really well. With my Triabolo I fitted a 13 tooth TDR pinion (roughly 15 to 1 overall ratio) a 530Kv Pyro 700 and it works brilliantly. Headspeed is right around 1300/1400 ish. It's 12s but this is a big heavy heli and the three blades total 488 grams.

I could go for a 16 t pinion and go just over 12:1 not sure if I should as I don't really understand ratio's that well other than it should give better leverage but still be in the headspeed range and keep the motor nearer it peak efficiency ??

[trillian]

I'm not sure at what sort of rpm these motors are most efficient. I'm sure that past a certain point you start to lose out as you reach crazy rpms of the motor can, but before you get to that point, in general the faster the motor spins and the longer the gear ratio, the better. This is because at the end of the day what really matters is torque as it arrives at the main rotor shaft. The longer the gearing the more torque you effectively have for a given wattage of power. Ultimately the answer is that you get a certain amount of torque at the motor shaft for a given amount of power - this doesn't change as you change motor Kv (or very little). Between different motors I think logically a larger diameter can should give you more torque vs a smaller can (even at zero rpm) for the same power draw. But... then you pay a weight penalty because the bigger motor will be heavier.

The other advantage of longer gearing is that the ESC governor is operating on the motor rpm, so the longer the gear ratio the less change in headspeed for a certain % change of motor rpm. So it's easier for the ESC gov to hold the headspeed you want (plus, less change in torque loads on the motor with loading and unloading the head).

From a drivetrain point of view I have to guess that a two stage drive setup has a bit more drag, but it's not enough to really worry about. (in theory you could do the same thing with a single stage drive but you'd have a huge main gear).

But the bottom line is that if it will fly well at 1500/1600 headspeed, that motor won't even be breaking a sweat. In the case of my 600s running on 6s, the Dune works well at quite low headspeeds and the tail holds just fine with 95mm tails. The Beam is lighter but the tail was not nearly as solid at 1650/1700 and it started working better at around 1800, so I now have a pair of SAB 570s on it but haven't tried it yet and I suspect it will be great. The JR E8 is bigger and heavier and also has the smallest main gear of the three, so it does work on 6s but it pushes the limits (and I had to bump up to 100mm tails).

I could go for a 16 t pinion and go just over 12:1 not sure if I should as I don't really understand ratio's that well other than it should give better leverage but still be in the headspeed range and keep the motor nearer it peak efficiency ??