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Old 02-18-2007, 08:04 AM   #1
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Anybody know much about these engines?
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Old 02-18-2007, 08:10 AM   #2
Sonic Boomer
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HP engines

Go to www.mecoa.com - plenty of info including history of the brand
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Old 02-18-2007, 11:33 AM   #3
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i have a 61 gold cup thats is one of the nicest engines ive ever owned lots of power, excellent throttle response on a pipe and will run fine on 0 nitro. quite comparable to a webra 61 speed actually
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Old 02-18-2007, 11:35 AM   #4
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I have a Hp 40 Gold Cup, 20 odd years old lots of power and runs like a dream. the standard muffler is a little noisy
To fly like a bird with radio control
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Old 02-18-2007, 11:41 AM   #5
Dennis 9412
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HP Engines

I have 2 HP 40 Silver Star engines. Bought them 30 years ago, still running strong!!

Great engines, at least the original ones before the Mecoa buyout were. Have no experience with post buyout engines so can't comment there.


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Old 02-18-2007, 08:14 PM   #6
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Sounds like there not a bad engine.
Would you say there a sport engine or a speed engine?
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Old 02-19-2007, 07:06 AM   #7
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A speed engine many years ago. No longer competitive in that class.

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Old 02-21-2007, 04:48 PM   #8
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Hirtenberger also designed two four stroke engines with a rotary valve system, similar in concept to full size high performance slide valve engines from the WWII era. Like the full size slide valve engines, the seal is problemetic and idle can be difficult to control reliably. They came in .21 cubic inches and (I think) .49. They are famously underpowered but make very little exhaust noise. Evidently they sound more like a burbling sewing machine than an internal combustion engine. I have a MECOA version but haven't run it up yet. This is one case where most are in agreement that the MECOA version can be superior to the original. HP made a version with plain bearings (bushed) for the valve train in the head. Mecoa still offers that version, but also engineered a ball bearing assembly. Anyway, I love odd engines so couldn't pass it up when one came up for sale on RCCANADA. I'll probably put it in one of the putzy Clancy designs like a Lazy Bee. After lots of reading I think I have the plumbing down for the HP four stroke, which routes crankase oil to the head and requires a separate needle valve to control that flow (I have a Perry aftermarket needle valve for that).

The two stroke engines are powerful and are noteworthy for having an inline twin version, which might be useful in a P-51 type warebird.

The Hirtenberger company is Austrian and now their main line of business is "ammuniton and components for small arms, mortars, tanks and howitzers".

Some people doubt that MECOA makes the same quality as the originals of the designs they bought and produce now. That may be, but I think it is great that someone is a source for hard-to-get parts.

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