Ryobi performance?
 

I finally got around to running a Ryobi 31cc. It produces 7100 rpm iwth a 18x10 APC. CDI auto advance ignition. I used a bigger carb and I bent the reed valve stop a little. That seems to be pretty good for this engine. It looks like a good physical fit in my Balsa USA 1/4 Fokker D-7. BUSA recomends a Zenoah G-26 in that plane. It looks like the Ryobi is doing a little better than a G-26. Since I would have to use a bunch of nose weight with a G-26 might this engine be a good choice with a 20x6 prop?

I have some others like an EFCO 39cc, Zenoah 41cc, and a Homie. All of these have the carb and exhause out the side of the jug. That might make a messier installation than the slim Ryobi. Any comments on these types of engines for this plane?

RE: Ryobi performance?
 

I need to do one for my 4*120. Whats the engine weigh and how long is it front to back? Any pictures?

RE: Ryobi performance?
 

I think a Ryobi 31cc would be too big dimensionally for a 4* 1.20 especially the long shaft version. between the rear carb and the long shaft it would be really long and you would have to add a bunch of weight to the tail.

A friend of mine has a 4* 1.20 with an Evolution 26cc gasser and that is a nice fit. I think you would be much happier with a gas engine that has a front or side mounted carb in that plane.

there is some good info on the 31cc here http://jagengines.com/

RE: Ryobi performance?
 

I have a CAP cowl for it and have tried fitting three different engines I have made. The side carb and exhaust hang way out. I measured as is and the Ryobi needs the firewall moved back about two inched to look proper. I could re-machine the crank to adjust also. We will see.

RE: Ryobi performance?
 

My son and i put a Homelite 30cc on his DVII that we built.All WW1 airplanes,the prop was real close to the cowl.With the 30cc homy in it it still stuck out a little to far.
I think about 1/2 an inch past the cowl.We had no problem with it going in the cowl because its so big and round.The ryobi would be too long unless you modified the firewall.Wich will be bad because thats where the front landing gear cross leg almost ends up.

Check the plans.Even the short shaft would be too long i think as i have a long shaft for sale in the classifieds here on rcu,and i have a short shaft on my shelf yet.
It had stock intake manifold,pitts side dump muffler,stock carb,mag ignition.I could hand start it on the 3rd flip every time.
No mod to firewall,cowl or anything to fit.

Running a zinger 18x10,7200 rpms about.Took off fine and flew most of the time around half throttle.I think my sons came out a little heavy.I asked Balsa USA if they would weigh the box and send me the lightes one because i was doing my own engine.They said they all weigh within a few ounces,because of there choice of woods.I doubt it.
Anyway,very nice plane and combo.What do you mean by Zenoah 41?Maybe a US engines 41,quadra 42.

A Quadra 35 up to a 41 would be killer.Im putting a quadra 35 in my 80 inch Jerry Behrens scratch built Sopwith Tripe.

RE: Ryobi performance?
 

How about some pics of that Tripe Buck???

AV8TOR

RE: Ryobi performance?
 

Ill have to find or take a few more.Then ill post.
This time ill save them.Im putting pull-pull on rudder and elevater.Ill show a pic of my setup for the elevater.
Im going with a quadra 35 because thats what the plane was desighned around.Mine bolted right n with no problem.If it flies ok ill leave it.If not,ill look for a 42,since it has the same mounting holes.
Im also using sig koverall,dope,ect so its not a quick process.
I also layed the aileron servos sideways in the wing so they dont show.The only thing thats shows is the rod.

OK,heres some pics:
6 wings,6 ailerons.
Removable tail,can also be adjusted for trim.
Tail skid has a spring on it so it moves as a shock absorber,you can see the slice in the fuse.
Aileron servo is mounted sideways so you dont see anything but the rod sticking out bottom of wing.
Youll notice the axles have a elongated slot as there going to get a small elastic cord from the sewing section as a bungee cord shock system.
Quadra 35.
Display wood prop.
One pic shows how close prop is to cowl.
Setup for Pull/pull on elevater is a straight rod,then a piece(horn) soldered on to rod,then another small horn soldered on for rod to servo.
My scheme is in the pic of plane.Its Raymond Cllishaws (Black Maria)====Maria means (wind).He was the top scoring Canadian Ace.
He had 2 planes,1 with a single gun,and 1 with twin guns.He was the leader of the famous "Black Flight".
I read somewhere that when Ricktofen was shot down,his fellow pilots where going after pilot Brown,and whomever was left.But in the distance they saw 4 Triplanes of the Black Flite,and ran.
Anyway,enough of the history lesson.
Enjoy the pics.
Ya,its work,but theres only a couple in the USA that are flying.I know of one person in Texas that flies with the Dawn Patrol.His is also a Jerry Behrens scratch built.

RE: Ryobi performance?
 

Wow!! Very cool, and a lot of very nice work. I never knew that the Sopwith Tripe had ailerons on all three wings before. That's cool, but I bet there is going to be a ton of adverse yaw. Nothing some good rudder work and/or rudder mixing couldn't take care of though... Keep us posted please!!

Time to get my "Red Baron" Fokker Dr1 tripe out and dust it off, check the tank, carb, etc. It has an Echo 23.6cc engine on Gas/Glow, and flies great. It has been greatly neglected and sitting like a "hangar queen" for a couple of years however... :eek:

Thanks and good luck,
AV8TOR

RE: Ryobi performance?
 

Thanks,its been and is still a lot of work.
I remember your tripe when you got it and your little hot rod kioritz you put in it.
The germans copied the sopwith tripe.The bad thing about sopwith was the flying wires.The first ones where to big and caused to much drag,they where round.
Then they changed them to a flatter streamlined style.
But the germans made there whole plane a little smaller,shorter wings,thinner wings,ect so they did away with the flying wires all together.
Theres a way to mix in some aileron differential to over come this a little.Ill just have to look at my futaba book and see how its done.I forgot.

RE: Ryobi performance?
 

It's easy. Give it about twice as much aileron "up" as "down", and you can do that in the "ATV" section of the programming. You may still need to fly it with some rudder inputs on the turn banks and exits, so be ready for that. If it is bothersome, you can also mix in some rudder that automatically applies when you use aileron, but that messes with cross wind landings. Not that you would be flying that Tripe in much of a cross wind.... !!

Actually, I have a nearly stock 23.6cc Echo in my Fokker Triplane. It turns a big old wide blade Top Flite 18 x 6 at around 7500 rpms, which is perfect for the plane. The souped up 23.6cc is in my Katana. Turns an APC 16 x 8 at well over 9000 rpms.

Anyway, so that we don't completely hijack this thread, my Ryobi 31cc in my big Tiger Moth turns a wood 18 x 6 at 8500 rpms. Too much really, and I need to "prop it up" or it will blow if I run it very long at full throttle. (A Ryobi should tach no more than about 7500 on the ground if the stock rod is to live for a while...) Mine has Frank Bowman ring, a larger carb, exhaust timing set to 150 degrees, head clearance (deck height) reduced to .020", electronic ignition, and an aftermarket two tube muffler.

My brother has an almost stock Ryobi 31cc in his Ryan's Rebel, and it turns an 18 x 6 at about 7700 rpms. It probably has pretty low exhaust port timing, and could use a larger carb as well.

AV8TOR

RE: Ryobi performance?
 

OK,thanks ill make a note of it.I probably wont mix the rudder anyway.Like you said,messes with crosswind landings,and my sons DVII didnt like crosswind landings either.
Anyway,so i dont hijack the thread.I sold a stock ryobi,except i had a rcexcl ignition on it.Stock carb,exhaust,ect.Im at 3,000 feet,.i was easily getting 7000 with a 18x6 with a power point or a black MAS.Cant remember.I removed the head,put it in the head of lathe so the base flange was between the teeth.Then i rounded the cylinder down even with the exhaust flange.Ill have to go see if i sold it here and post a pic.

RE: Ryobi performance?
 

"The ryobi would be too long unless you modified the firewall.Wich will be bad because thats where the front landing gear cross leg almost ends up. "

If I make a hole in the firewall for the carb and turn a shorter hub it looks like it may fit OK. I would have to make a thin muffler box with the stacks running alongside the case and out the bottom. The prop would end up about 1" ahead of the cowl.

The other option is a Zenoah 41 cc. It is from a backpack blower. On that one I would have to make a 90-degree bend in the carb manifold. That would allow me to put the carb right next to the case facing down. That with a thin muffler that engine would fit too. It is such a reliable engine I am warming up to it for this plane. How does it work out to put a 90-degree bend in the intake manifold? I am inclined to believe it would rob a little power but how much? It is "to much" engine for this plane so I probably would not miss a little horse power.

I really want to avoid unsightly bits sticking out the side of the airplane and I don't want to buy a zenoah G-26.

RE: Ryobi performance?
 

The 90 degree bend is no problem, some say they run even better with one. Clark in Europe sells them for the Zenoahs. Just be sure to isolate the carb from the metal manifold if you fabricate one, or you will have "hot start" problems due to the fuel boiling in the carb.

AV8TOR

RE: Ryobi performance?
 

to the earlier statement that a ryobi is too big for a fourstar 120. Actually, it fits very well.

Move your firewall back 2.5 inches. Go electronic ignition if you have the bucks. It 's a sweet combo.

billrad