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ryobi 4 stroke weight

Old 05-23-2005, 10:09 AM
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Dean in Milwaukee
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Default ryobi 4 stroke weight

Got my harbor freight 26cc ryobi 4 stroker a while back, and finally had some time to begin fooling with it.

I stripped the heat shield stuff, the muffler, the flywheel and the ignition bracket and igntion save the spark plug, and got a weight of only 3lb 7oz.

This is much lighter than I would have guessed, the muffler itself being suprisingly heavy. I'm not yet sure if I want to go with a battery ignition, but it would save close to a pound of flywheel.

Performance at this point is hypothetical, but this motor is rated for 1 hp at 7k rpm, and the calc program I'm using says a 15x8 apc with 1 hp will turn 7600 rpm, so I'm going to assume a safe 7 grand rpm in real life, which should be about 7.5 lbs thrust and 54 mph pitch speed. A 16x7 should also work theoretically, making about 7200 rpm, 9.25 lbs thrust at 48 mph, but would require the motor to really make the full rated 1 hp at 7 k, not a tiny bit less.

I'm thinking the 15x8 will be enough to fly a 1/4 scale cub pretty realistically, but would appreciate anybodys thought on this.

Thanks,
Dean in Milwaukee
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Old 05-23-2005, 03:13 PM
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Default RE: ryobi 4 stroke weight

What kind of ignition are you going to use? Sounds like a fun experiment! J3 is a nice plane for that engine, I would think. Regards Capt,n
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Old 05-23-2005, 03:30 PM
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Dean in Milwaukee
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Default RE: ryobi 4 stroke weight


ORIGINAL: captinjohn

What kind of ignition are you going to use? Sounds like a fun experiment! J3 is a nice plane for that engine, I would think. Regards Capt,n

Not sure who's ignition, have you any suggestions? Cheap is always good of course. As for the plane, I'm thinking perhaps the THE WORLD MODELS 1/4 scale clipped wing cub, probally in blue. Have to find out yet exactly how much its going to cost, but their 1/5th scale version is only $189, so I'm hoping it'll be pretty reasonable.

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Old 05-23-2005, 07:55 PM
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Default RE: ryobi 4 stroke weight

Dean in M I bought a ignition from RCIGN1. I think its the best deal and he will fix it, if it ever quits. The price is right too. Capt,n
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Old 05-23-2005, 10:21 PM
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Default RE: ryobi 4 stroke weight

Hi Dean,
I finished my Ryobi 4 stroke. It weights about 76 oz. with flywheel and coil ignition.I plan on trying glow fired E85 mix or regular glow, if I can make or buy a plug adaptor. The plug is special and very deep. I beam mounted the engine, so I can bolt it up to standard mounts. I havn't had a chance to run it yet, so I don't know how well it will run with the stock 9mm carb. The carb may be under jeted without the air filter. I took a couple pictures. I hope that this works, first time uploading.

Dave
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Old 05-24-2005, 08:48 PM
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Default RE: ryobi 4 stroke weight

Dave W: Sounds like that Ryobi 4 stroke is going to be neat on glow. If you can get a big glow carb that may be a way to see if its going to run good on glow. Good Luck.....Capt,n
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Old 12-25-2007, 01:39 PM
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Default RE: ryobi 4 stroke weight

Dave,

Were you ever able to run the Ryobi 4 stroke on glow or gas / glow?

Thanks
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Old 12-25-2007, 11:52 PM
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Default RE: ryobi 4 stroke weight

Foamcut,
I haven't fooled with the engines for a while. Teh very long reach special spark would make it very difficult to make a 10mm adapter. I thing EI would be the best ignition solution for weight savings. It would fire the plug every time. You will get ignition everyother revolution.

Dave
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