What upgrades on a T-Rex 550/600 for scale flying?

[Martin353]

Slightly better pics





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[Racing_]

I have decided to buy me a new Align 600 EFL, instead of using more money to upgrade the 550 with new esc and maybe a new motor and 12s. So the 550 will still be a pod & boom.

So, now i need som more help again.

510kV motor x 44,4V (12s) x 0.9 (Efficiency) x 13T pinion / 112T main gear = 2365rpm at 100%, so running at 1600rpm would require a pinion with 1600/2365 x 13T = 8,8T = 9T.

1. A 10T pinion would give me 1820rpm at 100%, so 1600rpm would be at 88% load on the esc. I think this would be ok, BUT i am thinking about what you Andy said about pinions shattering. What do i do?

2. Is the CC ICE HV2 ok for scale flying? Have they managed to fix the burning issue on the version 2 of the HV esc?

3. Is the guvernor mode good on ICE HV2 esc?

[Andy01]

I am guessing that the 600 EFL is the new 12s version ? I am not familiar with it, but if it has a 112T main gear, it is probably a Mod 1 gear ?

A 10T Mod 1 gear is probably OK - it would have a 10mm pitch centre diameter and the hole size is probably 6mm, so there is 2mm between mid tooth and the hole, which is probably OK (but check this because I am not familiar with the EFL). A 10T Mod 0.7 pinion would be 7mm pitch centre diameter, so only 0.5mm between mid tooth and the hole, which means that the root of the tooth is probably inside the hole.

Running at 88% on a Ice 2 will be fine.

An Ice 2 HV will be fine for scale - they have a decent heat sink, nice slow spool up and a good governor (and data logging). I run Ice 2 80 HV on both my scale helis. Just watch the length of your wire between the ESC and the lipos. Castle recommended that for every 4" more than 12" you should fit another capacitor of the same rating as those on the ESC - I have two extra 220 uF caps on mine and they are fine (I had no problems with either of my original Ice 80 HV either.

Something to check is if a 600EFL is actually compatible with scale fuselages - it may be but I have read that there are very few scale bodies designed for the latest 600 yet ?

Colin

[Racing_]

Hello Colin
Yes the 600EFL is the new 12s flybarless helicopter, and it have a Mod 1 gear.
I didnt know the difference between the Mod 0.7 and Mod 1 gear, so in this case a 10t pinon would be ok on the 600EFL.

Then i have to search more about fitting a 600 EFL in a fuselage, do you know why the new 600 is having problems with fuselage fitting?

Is there other helicopters/models you suggest for scaleflying? What helicopters/set up do you use in your fuselage?

[Racing_]

How would it be to run the CC ice2 80 hv on 10s (37v)? In that case i would be lowering the motor speed also.

On 12t pinion i would get:
510kV x 37V (10s) x 0.9 (Efficiency) x 12T pinion / 112T main gear = 1820rpm at 100%, and 1600rpm at 88%.

Is this an option?

[Andy01]

My understanding from what I have read here on the forums (and not from personal experience) is that the new 600 is not well suited to scale for a couple of reasons - the proportions are a bit different which means it may take some mods (probably not a big deal) to fit it into fuselages, and it is designed for higher head and tail speeds, which is more of a challenge to scale.

I think there was a thread almost next to yours asking about the new 600 - see what it says.

The headspeed can usually be reduced either through a smaller pinion, slower motor or less cells, but the gear ratio between the head and tail means that when the head is slowed down, so does the tail slow down (more so than on an older 600), which means that tail authority can be an issue.

I have a Chaos 600 (from RC Aerodyne) which I think is a good option for scale - it has a wider frame spacing so it is easy to fit almost any motor without frame mods, it has a 3 bearing main shaft setup, and it is fully compatible with the older 600s, so most parts are interchangeable. I think you can also pick up a bare bones kit for under $300, and the buy the electronics which suits scale, as option the Align kits are not ideally suited to scale (mainly motor speed).

In my Seahawk I have a Chaos 600, with Align balls, links & gears, a KDE hub, Trex 700 Mod 0.7 164T main gear (it is wider than the stock gear), 13T pinion, Xera 4030-470kV motor, 12s, Ice 2 80 HV ESC, Futaba BLS 252 cyclic servos, BLS 451 tail servo.

In my Vario Long Ranger I have a 22 year old Heim mechanics that I have converted to electric, but the same electronics setup.

The 10s setup will work, just slightly higher amps, and I found (a while ago) that many 6s lipos were as cheap or cheaper than 5s because they are more popular, so it may be more costly to go 5s/10s.

Cheers
Colin

[Racing_]

Hmmm...
I think this is the way i`m going:
- Align 600MX 510kv motor.
- 15t pinion
- CC ICE2 80 HV

510kV x 44.4V (12s) x 0.9 (Efficiency) x 15T pinion / 170T main gear = 1800rpm at 100%, and 1600rpm at 88%.

This way i keep my t-rex 550, stretch it to a 600 size (i already have the parts), convert it to 12s since i already will buy a new esc to get guvernor and data logging, and put it in the fuselage.
Then, i can buy myself a 700 size (probably a t-rex 700e fbl) and swap the batteries between the scale heli and the 700, since they both run 12s.
Another bonus for the 550 is that the batteries are located in the front, and not below the helicopter like the new 600 have. This will make battery changes easier.

Is this a good solution, or have i missed out something?

[Racing_]

Originally Posted by Racing_

Hmmm...
I think this is the way i`m going:
- Align 600MX 510kv motor.
- 15t pinion
- CC ICE2 80 HV

510kV x 44.4V (12s) x 0.9 (Efficiency) x 15T pinion / 170T main gear = 1800rpm at 100%, and 1600rpm at 88%.

This way i keep my t-rex 550, stretch it to a 600 size (i already have the parts), convert it to 12s since i already will buy a new esc to get guvernor and data logging, and put it in the fuselage.
Then, i can buy myself a 700 size (probably a t-rex 700e fbl) and swap the batteries between the scale heli and the 700, since they both run 12s.
Another bonus for the 550 is that the batteries are located in the front, and not below the helicopter like the new 600 have. This will make battery changes easier.

Is this a good solution, or have i missed out something?

Any input on this? I am ready to order

[Andy01]

Looks OK, but where you put the lipos may depend on what fuselage you use.

Colin

[Racing_]

Ok, then i will order the Align 600mx 510 kv, CC ice2 80hv and 15t pinon and convert my t-rex 550 to 12s.

For scale flying i think this will be great.

Thank you for all your help guys