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HelicopterScale Model RC Helicopters › Hirobo S60 AH1-W converted to electric
04-07-2011 12:06 PM  6 years agoPost 1
DrRotor

rrNovice

Auckland New Zealand

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Hello all.

I am new here. I am from New Zealand. I thought it best to introduce myself here as all I am interested in is scale. I work for the biggest R/C shop in New Zealand as the technical Heli guy and flying instructor.

I have just recently started working on my Cobra that has been sitting around for about 2 years since I bought it 2nd hand. These are the old S60 mechanics and not the S60II that most have these days. I have kept the clutch for scale start up perpouse.

I am using a Hyperion HS4035-560 5000 watt and it will run on 12 cells. Gyro will be the Micro BeastX and I will use Savox titanium geard servos. These will be powered by the dual battery spektrum reciver and controlled via DX8 untill my DX10T arrives.

A full overhaul of the fuse will be done and some super scale detail added. So far I have just finished making the motor mount so please enjoy the pictures and I will endevour to keep the post updated as I go along with the overhaul.

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04-07-2011 12:44 PM  6 years agoPost 2
wilerbee

rrApprentice

Hong Kong

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You will find that the cable drive that comes with the heli is not going to work too well. You should replace it with a newer cable drive system or change it to the hirobo shaft drive system to ensure reliability. I did 2 hirobo cobra conversions with the new shaft drive system and it is very reliable.

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04-07-2011 12:49 PM  6 years agoPost 3
DrRotor

rrNovice

Auckland New Zealand

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What sort of issue do you get with the old cable?

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04-07-2011 01:46 PM  6 years agoPost 4
Jason Lewis

rrApprentice

Whitby, Ontario, Canada

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Hello DrRotor

Nice work on the conversion!
What head speed are you planning? With 560kv and 12s it might come out too high, not sure of your gear ratio is though. Readyheli has MrMel's headspeed calculator, it is priceless for these conversions.

Good luck, Jason

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04-07-2011 03:02 PM  6 years agoPost 5
mikmerl

rrApprentice

Athens, Greece

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Great project, I love restoring and modifying quality model helicopters.
A 560 motor with 12 cells will get you close to 18000k rpm.
Is this compatible with your gearing to get the desired head speed?
I am currently doing a similar conversion to Vario mechanics with a 500kv motor (12 cell) and I had to do some serious reduction gear work to keep the recommended head speed. (as yet still untested)

mike

Vario Bell 47g II, Vario EC135, Vario BO 105 big, Vario Benzin trainer, Logo 600SE, Logo 550

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04-07-2011 10:42 PM  6 years agoPost 6
DrRotor

rrNovice

Auckland New Zealand

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Thanks guys.

I have not calculated my head speed yet. My main goal was the conversion. I chose this setup as it has the potential for some seriouse power output. Generaly I just adjust my head speed with my throttle curves. I will calculate the head speed with the gearing that I have and see what comes out.

This heli might come out to be quite heavy and this is another reason I chose the higher power option.

I have the option to run 10 cell with the motor and ESC that I am using. The ESC is 130amps. Thank you for all your input guys.

Later I will post up some of my other machines with 5 blade rotor heads.

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04-07-2011 11:04 PM  6 years agoPost 7
DrRotor

rrNovice

Auckland New Zealand

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Ok so this is what I got from the head speed calculator.

97T main and 10T pinion. 35c Li-Po.
12S = 2417rpm
10s = 2014rpm

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04-07-2011 11:38 PM  6 years agoPost 8
Mojave

rrElite Veteran

Palos Verdes, Ca. USA

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Very nice e-power conversion. Might want to use a 350-400 KV motor on 10S to bring that head speed down.

All helis and planes have an expiration date stamped on them...you only find it after you crash!!

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04-07-2011 11:41 PM  6 years agoPost 9
DrRotor

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Auckland New Zealand

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Thank you.

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04-08-2011 02:04 AM  6 years agoPost 10
MXCobra

rrNovice

Petoskey, MI

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Nice conversion ... I recently test flew a similar conversion with the S60-II mechanics using:

10 t pinion
95 t main gear
Scorpion HKIII-4035-330 KV motor
Kontronik Jive HV 80 ESC
12S Li-Po 5100 mAh 35C

With ESC in Gov mode at 70% my headspeed was 1420 RPM. Don't have a power meter but rough calculations show I'm pulling around 21 amps.

Rick

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04-08-2011 02:20 AM  6 years agoPost 11
DrRotor

rrNovice

Auckland New Zealand

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Thanks for the info Rick. Thats a nice setup you tested.

Thanks for your complement to.

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04-08-2011 04:19 AM  6 years agoPost 12
wilerbee

rrApprentice

Hong Kong

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First the old flex cable is too thin/narrow. Had been told by a few who owned this version tat the cable breaks after only a few flights, and on the one that I build for a friend, I found it a bit too tight and too much binding. Absorbs too much power.
For the headspeed, here are my setups :
Kontronik 55A ESC or Castle Phoenix 85A ESC, I prefer the kontronik.
Kontronik Tango 45 600 kv motor
10T pinion
95T main gear(stock Hirobo)
8s 3700 Li-po battery.
Headspeed 1300-1400 Max.
For headspeed calculation I always multiply the calculated headspeed by 0.8 to account for the 20% power absorption of the tail.
The flying video is up on youtube under wilerbee.

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04-08-2011 04:35 AM  6 years agoPost 13
DrRotor

rrNovice

Auckland New Zealand

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Thanks Wilerbee.

I dont supose you know exaclty what the size of the old cable was? The one thats in is is very free spining and not thin. May have been replaced before I bought it. Will keep in mind what you have said about the old setup and see how it goes.

Thanks for info.

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04-08-2011 04:41 AM  6 years agoPost 14
wilerbee

rrApprentice

Hong Kong

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The one that I built ended up as a display model. I am not exactly sure but the kit was from at least 12-15 years ago and I think the cable was around 4 mm dia. max ! The cable itself did not bind, only after installing into the mechanic and the fuselage that it proved to be very tight.

Good Luck

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04-08-2011 07:17 AM  6 years agoPost 15
DrRotor

rrNovice

Auckland New Zealand

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This cable is installed already and is very free running. Not sure how old my kit is but its been around the block a few times from the 2 previouse owners. Never been crashed luckely.

I have never flown it since I bought it. I have just been waiting for the time to work on it. It has been stripped down ever since I got it as I like to rebuild things and make them my own. I dont like flying other peoples work.

The cable will stay for now as it looks good but I will most defenatly keep an eye on it.

Stay tuned, this build will include opening cockpit canopy, detailed cockpit, intake covers and blade tie downs to name a few added features. It will take some time but all will be done.

Thank you all for your complements and advice.

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04-08-2011 08:09 AM  6 years agoPost 16
DrRotor

rrNovice

Auckland New Zealand

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This is how she looks currently. I also threw in a photo of one of my 5 blade machines.

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04-08-2011 11:18 PM  6 years agoPost 17
Krumrick2

rrApprentice

Sao jose dos Campos Brasil

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Hi Brent,

Nice to hear about the BT's by TF ( rsrsr seems like a code )
like that people of SmartModels, they are correct, like them !.

Back to the guns, tomorrow I will receive the Head Tracker to use to control the pods movements, and right now I modifying a servo to replicate the sound of rapid fire, this servo will work at the same speed and coordinated with the spining gun.

The basic idea is took a Standar servo, make a modification with metal gear, fix a steel thin plate in contact with the metal gear, when the servo spin this create a sound similar to the rapid fire.

Is cheap and easy to make, hope the sound loud enough to hear over the sound of the heli in flight, of course at close range.

Will be nice to see the pods working in your Cobra, later I will use your mods to make my own Cobra to.

regards,
Manuel

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04-08-2011 11:44 PM  6 years agoPost 18
DrRotor

rrNovice

Auckland New Zealand

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Yea that sounds like a good idea for gun sound. Im not sure what you mean by rsrsrccode. LOL.

Check these weapons out.
http://www.maxotronic.at/

You are more than welcome to use any ideas that you see from my build as it progresses.

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04-11-2011 05:09 AM  6 years agoPost 19
Krumrick2

rrApprentice

Sao jose dos Campos Brasil

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Yea that sounds like a good idea for gun sound. Im not sure what you mean by rsrsrccode. LOL.

Check these weapons out.
http://www.maxotronic.at/

You are more than welcome to use any ideas that you see from my build as it progresses.
I already seen the Maxotronic gun system, a year ago I watched their funny video with the helicopter attaking a tank, really cool stuff.

But there is expensive, at least for now.

A friend in USA, our colleague here in the forum Alfie2259 send to me a nice gift, a book with the USA Army aviation in Vietnam, I see in the book that the Vietnam era Cobras had an diferent minigun ( more barrels) than we can see in later version, is't that correct ?

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04-11-2011 08:09 AM  6 years agoPost 20
DrRotor

rrNovice

Auckland New Zealand

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Yea I know, expensive but really cool.

Yes I think the older versions had more barrels than the later ones.

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HelicopterScale Model RC Helicopters › Hirobo S60 AH1-W converted to electric
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