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Old Apr 24, 2012, 09:16 PM
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Here's a rare one - a 1939 / 40 Belmont "Gnat" 0.155 cu. in. Repros of this engine exist however, so is it a genuine original (as the patina would suggest) or a reproduction ?
http://www.ebay.com/itm/VINTAGE-BELM...item20c4f8ebd1
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Old Apr 26, 2012, 12:56 PM
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Repros of this engine exist however, so is it a genuine original (as the patina would suggest) or a reproduction ?

If a "repo" is made like this with the added rust, I think we are in big trouble!!!
Looking as it does in the picture does not push the "must have" button!
John
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Old Apr 27, 2012, 11:01 AM
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I sort of like the old fashioned method of attaching the spark plug wire to the spark plug. It is better than our old plugs with the screw on nut on top. On our old plugs, the wire would tend to splay out as you tightened the nut. With that spark plug there is a hole to poke the wire through so the strands don't splay apart.

The engine reminds me of a old cast iron Maytag washing machine engine I used to keep. It was one of my first fixer up engines I did that was successful. It had a little kick starter too. Every now and then I would start it up and watch it run for a while. I went into the USMC for a number of years and it disappeared while I was in the service.
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Old Apr 27, 2012, 11:09 AM
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Originally Posted by earlwb View Post
I sort of like the old fashioned method of attaching the spark plug wire to the spark plug. It is better than our old plugs with the screw on nut on top. On our old plugs, the wire would tend to splay out as you tightened the nut. With that spark plug there is a hole to poke the wire through so the strands don't splay apart.

The engine reminds me of a old cast iron Maytag washing machine engine I used to keep. It was one of my first fixer up engines I did that was successful. It had a little kick starter too. Every now and then I would start it up and watch it run for a while. I went into the USMC for a number of years and it disappeared while I was in the service.
Probably went on the front of a target drone.
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Old May 01, 2012, 05:29 AM
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Fuel

Hi, I am returning the McCoy 29 in my tetherered hydro to spark from its present glow conversion for use in vintage events,what percentage oil should I use in the petrol/gas? cheers,phil.
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Old May 01, 2012, 09:06 AM
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Hi, I am returning the McCoy 29 in my tetherered hydro to spark from its present glow conversion for use in vintage events,what percentage oil should I use in the petrol/gas? cheers,phil.
I would start with 20% to 25% mineral oil in the fuel you use.
From the Mecoa website http://www.mecoa.com/faq/fuel/fuel.htm
Quote:
Old time spark ignition model engines require a minimum of 25 to 30 % MECOA ignition oil mixed with regular pump gas or Coleman lantern fuel, AKA"white gas". Be sure to use fresh pump gasoline as the newer less polluting formulas loose their potency within a few months causing the engines to be rather hard to start.
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Old May 01, 2012, 11:34 AM
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Originally Posted by philpjuk View Post
Hi, I am returning the McCoy 29 in my tetherered hydro to spark from its present glow conversion for use in vintage events,what percentage oil should I use in the petrol/gas? cheers,phil.
philpjuk

In which location are you running tether boats?
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Old May 01, 2012, 12:48 PM
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I love those old boat designs.....I should build one and stick in a gasser.

Bill
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Old May 01, 2012, 03:05 PM
"Unnecessary Necessity"
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I love those old boat designs.....I should build one and stick in a gasser.

Bill
http://www.onthewire.co.uk/hydlist.htm
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Old May 01, 2012, 04:53 PM
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That site is now in my favorites column.....thanks for the link.

Bill
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Old May 01, 2012, 05:08 PM
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philpjuk

In which location are you running tether boats?
Hope to run at east park Hull but not at present as there are nesting birds in the circle! will be using a Traband design with a spark McCoy 29 and a Irvine powered novice boat but need new waders first as my 45 year old ones have perished!
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Old May 01, 2012, 05:13 PM
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Originally Posted by philpjuk View Post
Hope to run at east park Hull but not at present as there are nesting birds in the circle! will be using a Traband design with a spark McCoy 29 and a Irvine powered novice boat but need new waders first as my 45 year old ones have perished!
Will be nice to see pictures and maybe video I assume you are in the UK, not much tether boats around here
British A class 30cc ohc Tethered Hydroplane (2 min 46 sec)
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Old May 01, 2012, 07:24 PM
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Interesting.... Did it seem like the engine was running rich in that video?
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Old May 01, 2012, 07:31 PM
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That is a good website. I stumbled upon it last year when we were talking about the flash steam hydro video I posted. I wish there were active flash steam modelers around these parts..... No I don't. I can't afford another hobby.
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