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› Old Hirobo .60 Flatbed Mechanics- any advice on converting to Electric?
11-20-2011 03:36 PM  6 years agoPost 1
JBS

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UK & USA

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Gentlemen / Ladies - I would appreciate your help withthe following;

I have a mint condition 1980's vintage Hirobo Huey that uses the wet gearbox and flatbed mechanics, powered by an old, defunct .60 nitro engine.

I've converted most of my birds to Electric power, and would like to do the same for the old Huey. I would like to keep the Hirobo clutch, as the spooling up sound is much more like a turbine than just direct coupling the motor to the main gear.

Looking through the forum there have been a couple of topics touching on the subject, but is there anyone out there who can popint my in the right direction regarding motors, numbr of cells, how to fix the clutch to the shaft, mounts, etc (in other words everything!)

Any help much appreciated

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11-20-2011 03:45 PM  6 years agoPost 2
kglassman

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Phoenix Arizona USA

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You should get hold of Bent Air Haughland I sold him a huey a while ago (over two years ago) and he has converted it to electric using the original oil filled gearbox and clutch. This is his second Huey that he has in electric. And if you can not find him, on this conversion I can look in my records and dig up the information. I hope this can get you started.....Ok I looked up his email, but this is the only email I have..It's bentah@broadpark.no>

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11-20-2011 06:12 PM  6 years agoPost 3
JBS

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Thanks for the info, I will try to look him up.

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02-06-2012 08:30 AM  6 years agoPost 4
monyet

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Singapore

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I have the gearbox Gazelle, Jet Ranger and Cobra which I would love to convert to electric. The jet Ranger was never completed and the Cobra is new in box.
Good to get those birds in the air so please keep me in the loop as how it is done.
Thanks

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02-07-2012 01:00 AM  6 years agoPost 5
heliayto

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solihull, uk

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I wish to convert my flatbed gazelle to electric also. Is anyone making a coupling for the motor to connect directly to the input clutch bell drive shaft eliminating the need for the heavy clutch.

Any help greatly appreciated.

Regards

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02-07-2012 04:08 PM  6 years agoPost 6
JBS

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UK & USA

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I had an exchange of information with the gentleman mentioned above which was very useful, but the conclusion was that there is no easy way to solve some of the issues. The coupling of the motor to the gearbox can be achieved by the use of a vario flexi-coupling, but I've heard mixed reports regarding the durability of these.

The second issue on my bird is the tail drive. The exisiting piano wire drive is a known issue on these models and are prone to let-go without warning. I am looking to replace it with a flexible drive of some sort. Starwood Scale models have one- but anyone know of any other alternatives?

Some motor suggestions would be good as well. I've been using the e-flite power motors, upping the capacity of the motor- so if the nitro version used a .30 or .36, I've fitted an e-flite 46; if a nitro .46 was the nitro motor I've used an e-filte 60.

The problem with the flatbed mechanics is their weight. I'm currently trying to work out the power requirements of an electric setup in this helicopter. Has anyone else done this already?

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02-18-2012 07:07 PM  6 years agoPost 7
JBS

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UK & USA

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Getting the info together..... But some questions need answers....
Well, I've made a start on converting my flatbed 60 Huey to electric. Ive stripped out the motor, clutch, fan shroud, etc. I've weighed everything, worked out gearing ratios etc. I will post the data here shortly.

A couple of questions:

1) power requirement- forums suggest that the target power for a scale-bird is about 50 watts per pound (1200 watts per kilo). Does anyone out there have a view on this? The 60 size IC motor would have provided about 2 HP at full throttle, or about 1500 watts, but according to my calcs the power required will be about 800 watts.

2) the origonal manual doesn't give any headspeed suggestions. I guess in the early 1980's there weren't too many digital tachometers around! Does anyone still running this model know what head speed is being produced by the IC engine setup? ( the gearbox ratio is one rpm on the main rotor require 10 rpm on the motor driveshaft). I'm trying to figure out the KV rating required for the electric motor.

Thanks

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02-25-2012 06:45 PM  6 years agoPost 8
JBS

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UK & USA

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Still researching......
Lots of measurements and calls done. Looks like a 630 kv scorpion 4035 running 8 cells is the way to go. The mount will be a challenge, but I'm doing a design on CAD that I hope to get CNC laser / water-jet cut if the cost Is not too extreme.

I've posted a new topic asking for help in coupling the 6mmm motor driveshaft to the 6mm gearbox input shaft.

The gearbox has been stripped, cleaned, and re-built. A lovely bit of engineering.

I'm also looking for a ccpm conversion kit for another model that I might be able to bolt onto the gearbox- but im getting close to the point where I just junk all the old hirobo mechanics and fit TRex 700 mechanics instead. Especially as parts will always be an issue with the old mechanics. It would be a shame to not use the lovely hirobo rotor head, though......

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02-27-2012 09:36 PM  6 years agoPost 9
heliayto

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solihull, uk

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Thanks for the posts, keep them coming. I would be interested in the motor mount if not to expensive, like yourself the motor, power, battery combination is a very confusing topic.

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07-02-2012 03:49 PM  5 years agoPost 10
JBS

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UK & USA

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Motor mount
Just got the motor mount back from C3 engineering here in the UK. 3mm aluminium bearers and side frames, pinpoint accurracy all from my CAD plan. Cost was about £20 (US$ 35), and turned around in a week. Very impressed! Now all I need is the tail drive, motor, lipo's, ESC, about 100 hours, etc, etc

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09-25-2012 01:50 PM  5 years agoPost 11
B/T

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WESTERN AUSTRALIA

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Hi keep the clutch and change the motor shaft to take the clutch the same way the nitro engine does. There are hundreds of e-guys here that can tell you the KV of the engine to match the head speed. I have done this convertion on my nitro Hiem and Vario mechanics and the models spool up like a the real thing even sounds real.

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09-28-2012 03:18 AM  5 years agoPost 12
kglassman

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Phoenix Arizona USA

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Old Hirobo .60 flat bed mechanics
To JBS.....Bent air used a inrunner electric motor you might have to make an adapter to mount on the motor and shaft to adapt the clutch. This way you can use the original frames, clutch and transmission.You can use battery trays under each side of the landing skids.Also you can use auto grease to lube the tail wire drive and tail gear box. That is what I did on my Schluter tail drives and never had a wire brake.

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09-28-2012 08:46 AM  5 years agoPost 13
JBS

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UK & USA

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Well the heli is back together now, and almost ready for a test hover. Bench runs with the Scorpion motor (with clutch) have been successful.

I will post pics and video if the theory works out in practice!

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10-15-2012 10:13 PM  5 years agoPost 14
JBS

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UK & USA

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She flew today
I finally got a spare 10 mins so I decided to try the new configeration out. The spool up was normal, and the big blades made that lovely swoosh-swoosh. I added collective and..... Daylight under the skids for the first time in about 20 years.

But.... The head speed slowed as soon as the skids came off, and I could barely hover at full power. I will try again with fresher lipo packs, otherwise an increase in cells will be required. 8 cells may have to become 10. Odd though- the wattmeter showed that only 718 amps being drawn in the hover (out of ground effect) which is only 24 amps on 8 cells.

The funny thing was that the head speed increased over the minute or so that I hovered- I suspect the oil in the wet gearbox was thinning as it warmed up, releasing more power. Overall the head speed was too low in the hover under the current setup.

More experimentation with the power setup required, and probably need to go with semi symmetrical blades together with a higher head speed, but it's a start.

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02-18-2013 03:30 PM  5 years agoPost 15
billym8228

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billym8228@hotmail.c om

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Huey blades?
I have tow of these hueys the 60sizehome and the gas one.i need main and tail blades can you tell me wat size they need to b and where i can purchase them? My email is billym8228@hotmail.com tha.k you very much.billy

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