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July 16, 2019, 05:35:42 AM

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Author Topic: HGK  (Read 354 times)

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Offline The Saint. (Owen)

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HGK
« on: July 04, 2019, 18:16:07 PM »
What can you tell me about these engines, the.45 to be exact. I've recently acquired one with a Webra Dynamix carburettor, it seems to start and run well but I've never heard of them.

Thank you in advance.  :)
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Offline paulinfrance

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Re: HGK
« Reply #1 on: July 04, 2019, 18:19:18 PM »
Mode 2 THE only way to fly

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Offline e-flite_rules

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Re: HGK
« Reply #2 on: July 04, 2019, 18:54:03 PM »
I recall seeing one flyer use HGK 15s in control line F2D combat back in the late 70s or early 80s.  Just the one flyer. 


Offline British Victory

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Re: HGK
« Reply #3 on: July 04, 2019, 22:37:58 PM »
I bought an HGK 21 for use in an r/c car, still have it as a matter of fact though the silencer fractured at the stub. I think that using it in an offroad r/c car has to be the sternest test of any engine as quite often the engine would rev phenomenally when the car became airborne.
I flew it in several r/c planes and never had any trouble with it.
After the silencer fractured I bought one of the irvine minipipes and flew it in a Happy S shoulderwing model, the first artf I ever had. At some stage the minipipe fractured and I used a modified irvine 20 silencer, the last plane it flew was a junior 60 in about 1993 when I started using 4 strokes. It still has good compression and the original bearings. I have the heli head for it somewhere which was needed in the car.
If the 40/45 is anything like it it will be a good usable motor.
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Marked as best answer by the saint on July 05, 2019, 11:29:05 AM

Offline PDR

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Re: HGK
« Reply #4 on: July 04, 2019, 23:42:45 PM »
They were a range of novel AAC engines imported by (IIRC) ripmax in the mid 70s to mid 80s and offered for what were pretty good prices given their build quiality. I had (still have somewhere) an HGK21 rear-induction motor that I had in an RC rat racer which went like stink on a pipe - about 26,000rpm on a 6x6 wooden prop. It was nearly as quick as the Irvine 15 which replaced it (not bad considering the Irvine is an out-and-out speed motor). I've also got an HGK 45 heli engine somewhere that was originally bought to go in my schluter Superbaby (collective pitch version of the original helibaby). It was a good motor, but was easy to over-cool.

These motors have no cylinder liners - they have an investment-cast monobloc upper cylinder which is bored, chromed directly onto the casting and ground to size. I'm pretty sure this was the only time that was attempted on a commercial engine. They also have a prop stud the screws into the front of the crankshaft rather than threading the end of the shaft (an idea Ron Irvine also used on his 40s). This means that if you crash the motor and bend the stud you can just fit another one for a few pennies rather than replacing the whole crankshaft. It also makes fitting metal spinners much easier.

Bottom line? Ifg the piston fit is still good then use it - they're nice engines. Just bear in mind that there will be no spares of any kind still available, so if the piston is clapped then it's just a doorstop.

PDR
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Offline The Saint. (Owen)

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Re: HGK
« Reply #5 on: July 05, 2019, 11:35:14 AM »
Thank you Pete, I did see the prop stud and I thought it was a good idea.
I don't know if I will use it or not, it does seem to run beautifully though I don't know how or if the Dynamix carb has anything to do with it. :)
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Offline PDR

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Re: HGK
« Reply #6 on: July 14, 2019, 10:20:37 AM »
As it happens while I was putting stuff away after flying yesterday my eye fell on one of my engine boxes and my HGK21 was sitting at the top of it:

ila_rendered

As you can see, they didn't do a special rear-induction crankcase, but just fitted a plug in the intake boss. The fact that I put it away "loose" and uncleaned rather than boxed or bagged suggests that it suffered some terminal mishap - I guess it shelled a bearing or dropped a plug element down the side of the piston or sommink, but I didn't investigate due to lack of time.

PDR
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