Trex 600 scale with 10s 5000

[ygen72]

Hello
I have a bell funkey fuselage and a bunch of 5000 5s battery. Do you think I can use it for a Trex 600 project or should I unfortunately will have to buy new batteries?
Thanks for your help.
Yann.

[pril250]

It is doable. Especially if you going scale weight shouldn't be an issue as long as there is enough space.

[ygen72]

OK, thanks for your answer. Should I get a standard 12 s combo? I or will it have to adapt to specific because it is 10s?

[pril250]

A 630KV motor on 10S with a 17T pinion will do ok for governed HS of 2000-2050RPM and then with 16T ideal for 12S. An HV80A ESC will be required.

[ygen72]

OK great. Thank you for your answer. Do you know where I can best buy Trex not in bundle? In France I can only find combo item

[Andy01]

I doubt you would want to run anything like 2000rpm in a scale 600 - more like 1400 for 4 blade or 1500-1600 for 2 blade.

I run 12s in mine, but there is nothing wrong with using 10s if you have a bunch of good 5s lipos, and the fuselage has space (you don't say which Bell). You just need to work out your motor kV and pinion gear to give you the headspeed you want.

630kV x 37V x 0.9 x 14T / 170T = 1730rpm @ 100%, so 1500rpm @ 87% governor or 1600rpm @ 93% governor.

I am not sure there is many Trex 600 helis without electrics nowadays. Perhaps try a Chaos 600 from RC Aerodyne.

Colin

[ygen72]

concerning my battery, this is zippy battery that i use for a jet ranger vario. My bell is a 222 fuselage from funkey. Do you think i will not have enough space? The fuselage is 2.2 kg, batteries 1.2kg. It would be almost 6 kg!!! a truck in the air :-)

[Sweetfrost]

Hi there.
It's har to find a barebone pack of the 600E Pro.

This is the one place i could find to get a Trex 600E Pro without electrics. Only the 600MX engine and blades are in the package.

http://rotordisc.dk/shop/t-rex-600efl-pro-6487p.html

regards

[Andy01]

Originally Posted by ygen72

concerning my battery, this is zippy battery that i use for a jet ranger vario. My bell is a 222 fuselage from funkey. Do you think i will not have enough space? The fuselage is 2.2 kg, batteries 1.2kg. It would be almost 6 kg!!! a truck in the air :-)

I have no idea if you would have space as I do not have that fuselage. I have space for two 5000mAh 6s in both my Vario Long Ranger (8.5kg) and my 600 sized Seahawk (±7kg), but it depends on the width and length of the fuselage.

Colin

[ygen72]

As I can read you, it really seems that weight is not an issue.. Could you tell me how long you can fly with your batteries on youth 700 and 600?
I ll try to find a Trex 600 with a 630 kv motor.. Thanks

[ygen72]

Hello,
I don t understand why andy use "170" in the formula, the main gear is 113t. As expected i cannot find Trex with 630 kv motor. May be it is possible to get the regular combo with 600mx and change the pinion? What do you think?

[Superior]

I have a 10s setup an it's awesome 3d machine using kontronic tango 48-08 (800 kv) motor an there jazz 55-10-32 esc that setup would work for you if you're gonna stay 10s setup an im using 2 5s 4500ma 35c Voltz lipos an im getting 7 mins of hard 3d

[ygen72]

OK thanks for the reply.could you tell me what pinion, do you use and the other rpm of your rotor?

[Superior]

13t pinion. An I don't know what my headspeed is I need to get it tacked

[Andy01]

Originally Posted by ygen72

Hello,
I don t understand why andy use "170" in the formula, the main gear is 113t.

In the original post a "Trex 600" was mentioned. A stock Trex 600 has a 170T main gear. I am not familiar with the Pro, but I am not aware of a 113T main gear for a 600 (but obviously there is one if you have one ). The Mod 1 gear is 115T I think.

The formula will still work, just substitute the correct number of teeth.

As far as flight time goes, I get at least 12 minutes (2x 6 minute) of flying on a pair of 5000mAh 6s lipos on both the 700 sized Long Ranger and the 4 blade 600.

Colin

[ygen72]

Hope I will get the same autonomy with 10s on my scale project. By the way is nt it possible to use stock motor 600 mx 540 kv and figure out the good pinion to have the right rpm with the formula?
Thanks

[Andy01]

As long as you can get the right gearing to give you the headspeed you want, and the motor can handle the voltage (which I assume it would given the low kV rating), you could use it.

540 x 37 x 0.9 x 11T / 113T = 1750rpm @ 100%, so 1500rpm would be around 85% governor, which is getting a bit low. A 10T would give around 1500rpm @ 95% governor, so not much flexibility there.

This assumes you can find a (Mod 1 ?) pinion as small as 10T or 11T.

Colin

[ygen72]

OK. But messing with pinion has probably an impact on the amp needed. Don't you think?

[Andy01]

I can't see why ?

Reducing the headspeed will lower the amps, and reducing the battery cell count will increase amps.

I don't think there would be a lot of difference between running, for example, a 730kV with a pinion to give around 1750rpm, or a 560kV motor with a pinion to give the same speed. It is the load on the motor that creates a power consumption, and thus amps - if the load is the same due to the same headspeed, then the amps should be very similar (assuming both with 10s of course).

Perhaps I am over-simplifying it ?

Colin

[ygen72]

You are probably right. This the weight of the helicopter and the pitch curve will have impact on the amp consumption