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Home✈️Aircraft🚁HelicopterAntiques or Out of Business › Another Hirobo To ID
02-10-2020 08:07 PM  6 months ago
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helitoyz

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Another Hirobo To ID
Anyone know what this thing is:

https://www.ebay.com/itm/1333257686...utorefresh=true

Looks later than the Falcon series. I thought it was a Hirobo Stork variant but the frame is not right. The head, boom, boom holder, vertical and horizontal stabs, tail rotor assembly, and servo trays all look similar to the Stork. But the weirdo engine assembly on the Stork and cutouts in the frames on the Stork don't match????

Thanks, Bill
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02-10-2020 09:29 PM  6 months ago
madgadget

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Definitely a stork canopy, competitor frames, but the servo tray throws me off. Not 505 or Gmp??
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02-10-2020 10:53 PM  6 months ago
Notar

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Its a Stork with different motor and exhaust setup. My motor is not the same as this as its a bottom muffler OS 50. The servo tray and side frames are the same as a Stork.
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02-11-2020 03:15 PM  6 months ago
helitoyz

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I thought the machine looked like one of my machines (I have too many to remember them all) so I pulled it out and it is identical down to the frames, plastic servo holders, plastic canopy locating pin on the top, main gear with cutout holes, etc. So I am doubting that it is a Stork with Legend frames. The one that I have looks to be never flown. Unfortunately it came to me with no canopy. Still not sure. Unfortunately the vrhc site will not allow me to blow up the individual Stork photos ... it just clocks.
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02-11-2020 06:21 PM  6 months ago
helitoyz

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The helicopter frame does not match any of the Hirobo Storks on Klauss's site that I can find but I did find a Youtube video of what the author states is a Stork that looks like if matches what is on eBay:

Watch at YouTube

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02-24-2020 09:23 PM  5 months ago
hrc37

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Storks
Well there are actually two different Stork versions. The Japan Hirobo version (uses a special OS engine) and the Hirobo/GMP version that used a standard OS engine. I purchased a NIB original Hirobo Stork from Japan about 5 or 6 years ago (with the special OS engine). I have it about 90% built but never finished it. I can post pic's if anybody is interested. Mark
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02-25-2020 04:28 PM  5 months ago
helitoyz

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Well based on what I am seeing that makes sense. I wonder if that was during the interval when Hirobo put GMP out of business and Hirobo redesigned the drivetrain at that point to come out with Stork variant #2.
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02-25-2020 05:29 PM  5 months ago
madgadget

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This intrigued me enough to pull out my GMP reference material.
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02-25-2020 06:18 PM  5 months ago
hrc37

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I'll post some pic's tonight of mine. By the way, the Japan version (one I have) has a belt off the clutch that drives the cooling fan which is mounted right over the cylinder head. And the OS engine is rear exhaust with a special muffler. And the head is one that was never sold by GMP.
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02-25-2020 06:48 PM  5 months ago
hrc37

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And it's belt start....not top/cone start like the GMP one was. Here are a few pic's of the one I purchased from the shop in Japan. They e-mailed me these pic's before I bought it back in 2014. I paid $300 shipped and that included the new OS engine.

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02-25-2020 07:44 PM  5 months ago
helitoyz

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I looked at the vrhc site at the Stork and the one that had pictures that I could see was the integrated engine drive system with the belt. The engine intake was pointed down and it looked like you had to take the front housing off the engine and turn it 180 degrees so the intake pointed down. One of the articles talked about the engine wanting to start backwards and how to get it running the correct direction. I didn't know the OS engine was special for that model. What is different about the head? Thanks, Bill
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02-26-2020 02:47 PM  5 months ago
hrc37

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Pic's
Here are some pic's of my Stork. It's a little dusty form sitting around for a few years. Not sure when I'll get it flying. Maybe for IRCHA if I can find the time.

Bill, to answer your question about the head, nothing really special about it other then the yoke and blade grips are composite. But this wasn't the head that GMP packaged with their version. Mark

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02-26-2020 03:11 PM  5 months ago
helitoyz

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Very nice. Slick looking engine package with the belt and integrated muffler. Nice to see a machine without 30 year old fuel stains on it(been working on a couple of rough Morley Bell 47s with that issue). When I asked what is special about the head ... I was referring to the head on the engine as I thought you said that the OS engine was a modified for that machine and it had a special cylinder head. I know the carb is pointed down but I thought the front casing of the engine was simply turned 180 degrees to achieve that. Thanks, Bill
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02-26-2020 03:16 PM  5 months ago
helitoyz

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Hello Mark,

Reread the thread and I saw that I misread your post. You had stated that the composite head was never sold by GMP that is fitted on your particular Stork. Is the only difference with the OS engine that it has a rear exhaust? I read somewhere that the engine was special to your model of Stork and not available from OS. Thanks, Bill
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02-26-2020 03:43 PM  5 months ago
hrc37

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Hey Bill,

The carb is not "pointed down" but as you stated, the outer part of the crank case is rotated 180 degrees so it won't interfere with the fan assembly. So the carb is still "up right" as on a conventional engine. This along with being a rear exhaust is what makes it special. Not sure if there was anything else different about it. Hirobo did include this engine with their version of the kit and of course GMP used their own frames along with their standard clutch/engine setup for the US market. And the fact that GMP used very few Hirobo parts in their version. I think the name "Stork" was as much as they used...other then the servo tray, boom, and fuel tank...lol Mark
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