If you want a very good performance bipe that is cheap, low weight and perfect for the Ryobi???? try Nitroplanes ultimate 120 bipe!!!!! I flew one with a 25 size Gas/Glow conversion and it flew GREAT until thumb error flying inverted.
A 31 cc ryobi would make a great match for that bipe and you wouldn't need to make any holes on the side of the cowl. The cost of the ARF bipe is $189.00 U.S. dollars if you buy it through RC universe, check the buy/sell section.

Well, it's been a little at a time project so it's taken a while, but my Nitro Planes Big Tiger Moth is getting close. About all I have left is to rig the flying wires, test run the engine and then screw on the cowl, and add the decals.

I took out the squish band in the head, left out the base gasket for more compression, and raised the exhaust port to get 150 degrees of timing on the Ryobi. It also got a Frank Bowman ring, an 11mm carb, and a Whacker muffler. It will be run on Gas/Glow.

The plane is a very nice size at 78" wingspan, and seems made for the Ryobi. We'll see how it flies, hopefully soon. It wasn't a bad build, though I had to have the company e-mail me instructions. Wing alignment is a bit of a challenge, but all in all I'm happy with the plane so far.

Oh yeah, I've got to finish rigging the inter-aileron connections too. I changed the design from two ailerons to four, so that took a bit of extra time also.

Here's some pics...

AV8TOR

Hey Capn' John,

You had asked about pics of this setup. Did you notice I posted these? Sorry it took me a while. Finished the aileron interconnects and the flying wires today. Maybe tomorrow I'll add the decals, check the control throws and c.g., and test run it. We'll see....

AV8TOR

av8tor1977: Yup I sure did notice the photos. That yellow bipe is going to show up good in the sky. Be carefull not to rip the wings off with that 31cc power plant you put in it! What kind of hinges do you use in the bigger birds like you have? I got a CMP G202 and I got to decide what to use. Thanks Capt,n

I've been using the CA glue hinges in everything with no problems. I use a pin in the center when installing to make sure they are centered, and I slowly wick in about 8 drops of CA on each side. Even on 80 inch gas powered planes I've never had them come loose, break, etc. Works for me....

AV8TOR

Well darn... took my big Tiger Moth with the Ryobi to the flying field today, and decided it was just too windy for a test flight. (About 15 gusting to 25 or so.) Oh well.

The airplane needed 5 ounces of weight on the engine to balance where recommended. I probably could have moved the battery and fuel tank forward and not had to add the weight, but I got lazy. 5 ounces isn't much with this much wing area. I'm running Gas/Glow, so anyone wanting to do this plane with a Ryobi on electronic ignition would probably find the c.g. falling exactly right with no added weight anywhere.

On the ground test run, my throttle servo failed in the full open position! Sure glad that decided to happen on the ground and with the plane tied down! Wouldn't be too much fun flying around at full throttle for 20 or 30 minutes until it ran out of gas!!

I'll let you know when I do get to test fly it.
AV8TOR

Hey try using a Ryobi on a sig 4 star 120 and if your looking for lively aerobatic fun you'll be very pleased. Mine always come out at 12+ lbs.l with 2 piece wing and smoke setup.I've built about 4 or 5 of these and they work great.You can view a couple of them at jagengines.com just go to testimonials and look at Jim Adkins testimonial.Anyways if someone decides to do this set your firewall back 2" and put elevator/rudder servo's in tail and you'll be very close on c.g.

I have a Evra 190 (Ryobi 31cc) and I want Wich blade can i use with this engine?

An 18 x 6 prop seems to work best on the Ryobi, but that is assuming a largish, scale type airplane. If you want more speed, like for a warbird, I would recommend a 16 x 10. It is best for the Ryobi if it runs about 7500 or less static rpms.

AV8TOR

Well Av8tor did you ever get this bird up?

I have 3 Ryobis here and am wondering how good is good.

Like a wise man once said to much power is just right.

My top wing is hinged and ready to go from the factory.

I ended up with the silver version.

Let me know what you think.

Are you any closer to your set of plans for me?

What do you guys think of a Ryobi 31cc in a Wild Hare Edge 540 that takes a 26cc. I weighed mine without muffler, ignition and prop adapter(since I haven't got the muffler or prop adapter yet) and it weighs 2# 9 oz. I'm going to get the EI kit from CH ignitions as I have an S/S ignition that is brand new. I want to get a muffler from wackerengines.com. I changed the carb to a Zama C1Q that has a 12.5mm venturi.
Thanks

Have you ran the 31cc Ryobi much yet? How is the viabration? Thaks Capt,n

I wonder if one could be shoehorned into a Great Planes PT-17, or at least the Super Stearman? I love my PT-17.. beautiful flyer IMO. I only have a surpass .91 in it, and had to add a considerable amount of nose weight. The weight of a gasser may better suit it.

What is the diameter of the cowl and the distance from firewall to the inside forward part of the cowl? (behind the fake engine stuff. BTW how much is the distance from TE of prop to firewall) Maybe a G-26 if not a Ryobi.