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09-06-2006 12:18 AM  14 years ago
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asong26

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VA

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Evolution 26GT
http://www.horizonhobby.com/Product...rodID=EVOE26GT2

Anyone tried this on a Heli? I just read an outstanding review on Fly RC.

If we are currently fitting Zenoah G261 PUH, then why not this? According to the reviews, this engine is smooth as silk. Secondly, this is a purpose built RC motor, not an industrial weedeater / chainsaw.

As for the 231 spec, I am most likely going to go with the TRM, but if I ever decide to step up, this would be it...

Comments? Ideas?

----------------------------------------------

Specs:


Specs
Type: 2-stroke Gasoline
Displacement: 1.55 cu in (25.50 cc)
Bore: 1.30 in (33.00 mm)
Stroke: 1.17 in (30.10 mm)
Cylinders: Single
Engine (Only) Weight: 936 g (33.6 oz)
Crankshaft Threads: M 10x1mm
Benchmark Prop: 18x6 @ 8,700
Prop Range: 16x8 - 18x8
RPM Range: 1,400 - 9,500
Fuel: Gas/Oil Mix 40:1
Mounting Dimensions: 146 x 70 x 99 mm
HP: 3.8 Ps @ 9,000 RPM
Cylinder Type: Ring
Carb Type: walbro 2-needle WT481
Crank Type: Ball Bearing
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09-06-2006 12:29 AM  14 years ago
asong26

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I am not an engine expert, but I guess is that if we mount it on, and have enough engine RPM, we can use appropriate pinion gear to produce the ideal main blade RPM. As for the size of the enigne, again, I am not an expert, but for those of you engine experts out there pleaes take a look. Here's the link to the product manual which outlines the dimentions as well as all technical specs of this engine.

Thanks.


http://www.horizonhobby.com/ProdInf...5GT2_manual.pdf
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09-06-2006 12:45 AM  14 years ago
Eury

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I can't comment on it in a heli, but I have on that I put in a 1/4 scale SuperCub, and it's a sweet engine. Starts easy, good on fuel, and makes excellent power. It's been very reliable in the 4-5 hours I've put on it so far, sure seems like it'd be great in a heli.Nick Crego

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09-06-2006 01:09 AM  14 years ago
asong26

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Thanks for that input Nick,

Do you have a gasser heli? If so, how does the engine size compare to the Zenoahs?
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09-06-2006 04:34 AM  14 years ago
Toadster25

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Iowa

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I have no idea but to me it looks like you would have problems keeping that engine cool in a helicopter.
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09-06-2006 05:22 AM  14 years ago
Eury

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I've had a bunch of gassers. Physically, it's smaller than the Zenoahs that we're all familiar with, and my carefully calibrated hand says it's also lighter. The packaging is different, from the backplate to the prop driver is longer than the Zenoahs (from memory, it's been a while since I've had one out of a heli in front of me), so it'd take a bit of doing to get it in a heli, but it wouldn't be a monumental task. In all, it's s nice engine. Although, like Toadster says cooling might be a problem, there's not much in the way of fins on the head, but anything is possible.Nick Crego

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09-06-2006 05:28 AM  14 years ago
asong26

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It is absolute shame that Evolution is not modding the engine for heli use. Especially given the fact that all of the gasser heli fans here are just dying for a smooth 26.

It's no secret that everybody wants at least 26 in their gassers. However, due to high harmonic pitch that happens at a higher RPM, it's having devsatating effect on tearing the helis apart in the air. Hence, the engine modders are focusing more on the z231.

What a shame...
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09-06-2006 04:14 PM  14 years ago
Shiro Muji

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We have tried using a similar engine before. It has an electronic ignition and graphite coated piston. The mfr is MVVS and specs written on the box indicates almost identical specs you indicated. We mounted it to a heli that used to have a zenoah 231. The result that we got is that the engine begins to over heat and stuck up after a few seconds in hover. I think its great for airplanes where you have plenty of cooling air from the propeller but not for helis.
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09-06-2006 04:29 PM  14 years ago
Flying Tivo

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Monterrey,NL,Mexico

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Specs for a GT26 on a raptor 90se
I tried to fit one of this engines on a raptor 90se and the dimension just would not fit. I agree that heat would be the greates issue. It would probably work better on a front mounted engine like vario xtreme, DNTs, etc.

Felipe
If life throws at you lemons......Squirt some lemon juice in the eye of your enemy!!!!
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09-07-2006 02:48 AM  14 years ago
asong26

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As you all know, I am a noob to this forum, and this sport. I've only flown electrics, and trying to move up to that pefect heli. I am sure someone among us have figured out the heating issue. I know it's not the same, but I am quite a bit of a modder in the custom PC cooling (overclocking, etc...,) I wonder if certain air cooling can be done via the wind produced by the main blades. Potentially hooking up a light weight heat hipe to transfer the heat to a heat block.

At this point, it just seems hopeless.

Since you guys have tried this on a MVVS, does this mean my 'ingenious' and 'original' idea about using Davis Diesel head on a OS 91 is also out the window?
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