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Other › 6S.. Parallel, Serial ?..
08-30-2012 06:37 PM  5 years agoPost 1
Tiltrotor

rrNovice

Poitiers,Vienne - France

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Hello guys.

I'm equipped as follow :

Hughes 500 D 600 Size heli, on old Caliber 30 mechanic converted to 50 size,

Kontronik Heli Jive,
Kontronik Pyro 700
2 X Thunder Power 6S, 25C, 5400 mAh LiPo pack.
5 blade rotorhead with 615mm M-Blades
Running on 12S

With that, I get 8 min flight times at 1200 RPM, leaving 30% in the pack.

I'm not satisfied yet and I would love to reach the 10-15 min of flight.

The Idea I got was to hook up my 2 packs in parrallel instead of serial to double the capacity, so I would have 1 big pack , 6S and 10800 mAh !!

So I would swap my engine to a less powerful but higher kV motor like the Pyro 600- 930 kV.

at 60-70 % I would get around 1200 heaspeed, that's what I want.

You experts, what do you think about that ?

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08-30-2012 07:17 PM  5 years agoPost 2
Darren Lee

rrElite Veteran

Woodstock, GA

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Well, you won't be changing the total energy available but will be pulling more current at lower voltage so the system might be less efficient. My guess is less, not more, flight time.

Can you drop a pinion tooth and increase your throttle percentage? That should gain some flight time.

Team Synergy / Rail Blades / Morgan Fuel

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08-30-2012 08:08 PM  5 years agoPost 3
Tiltrotor

rrNovice

Poitiers,Vienne - France

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mm mm..

I never thoughts about that ( yeah yeah, P=UxI i know .. )

Ok so, according to you guys, what would be the best setup.

I saw that guy :

Watch at YouTube

who claims to have 14-15 min flight times.

he is using :

-Logo 600SE
-Pyro 700/45
-12 Ritzel
-Jive 80+ HV
-TS-Servos Savöx 1258MG
-Heckservo Savöx 1290MG
-mini V-Stabi 5.3 pro
-Akkus 2x5s Turnigy 5000/ 25c

So relative same setup, I just have the Heli Jive, and run on 12S, 5400 mAh..

Any tips to have such flight time would be appreciated.

Thanks !

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09-01-2012 07:50 AM  5 years agoPost 4
Tiltrotor

rrNovice

Poitiers,Vienne - France

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Hello,

So, any tips for longest flight time ?

Should I change anything, motor, batteries, gear ratio ?

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09-01-2012 08:31 AM  5 years agoPost 5
R.J.

rrVeteran

SF bay area, CA USA

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Since you have a similar setup (headspeed) as the one in the video except that he has a Logo 600SE, I think the difference would be in the flying weight of your helicopters, as a Logo600SE in the Mikado fuselage is very light for its size. The mechanics are some of the lightest 600 size mechanics available, the fuselage is also light, and the mounting points are carbon fiber.

Also his video is only about 6 minutes, so his 14-15 min calculation could be based on the potential to fly 14-15 min if he drained his battery to 100% capacity. If you were to theoretically drain your battery to 100%, you are not that far off. Your battery should last about 11 min.

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09-01-2012 10:41 AM  5 years agoPost 6
Tiltrotor

rrNovice

Poitiers,Vienne - France

My Posts: All  Forum  Topic

Ok, So I keep my actual gear, 12S, motor etc..

Any change of the gear ratio would help ?

I'm at 60% of flat curve to achieve 1200 headspeed with my actual ratio, also have the possibility to put a pignon so I have 12.5:1 ratio

It would be useful to know at how % the Pyro 700 is the more economical, related to amp draw..

That's true that Kontronik should offer some kinf of data log, not only for the Kosmik..

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09-01-2012 11:46 PM  5 years agoPost 7
R.J.

rrVeteran

SF bay area, CA USA

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You could try a smaller number of teeth pinion and run the governor percentage up around 80-85% to try to get some more efficiency, or go to a lower kV motor. Are you using Pyro 700-45?

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09-02-2012 02:11 AM  5 years agoPost 8
Tiltrotor

rrNovice

Poitiers,Vienne - France

My Posts: All  Forum  Topic

Hello,

Yes, the 450 kV version, the lowest and more powerful ( without Going to 800 size )

On the manual, they recommand 60-65% , governed, that is exactly what I have.

So, a lighter motor like the 650 or 600 Pyro wouldn't be enough, they run on 8S or 6S.

most semi scale of that Size I already saw, using T600 mechanic most of the time, are running 6S, 5000 mAh and are around 5-6 kg.

If I put mine in parallel, that would make a 6kg overall weight, for 6S and 10 800 mAh. You think it would really be the same ?

If some of you are using the Pyro 650 or 600 ( respectively cont power : 3000 Watts and 2000 Watts ) with diferent kV variants, what do you think in a scale machine ?

Sorry for my bad english,
Thanks for all !

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09-02-2012 02:39 AM  5 years agoPost 9
dumbthumb75

rrApprentice

Oslo, Norway

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Do you know about the Jlog?

It's an aftermarket logger for Jive's.

Should be a good help for optimizing your setup.

http://jlog.hacknet.eu/fr/

A smaller pinion and th.% at 65-70 should help, but the Jlog will provide the facts...

Edit : Probably a better link :

http://www.sm-modellbau.de/shop/pro...id=124&cPath=16

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09-02-2012 02:48 AM  5 years agoPost 10
Tiltrotor

rrNovice

Poitiers,Vienne - France

My Posts: All  Forum  Topic

mm I'll investigate that way.

Thanks

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