another darn ryobi post (ryobi performance modification, analysis and comparison)
Hi. I have just pulled a Ryobi from a trimmer. It saw a couple of light seasons on it. I removed all the excess off of it including mag. I intend to use XYZ EI from hobbycity. Also replacing the Zama carb with a 12 mm Walbro. The cylinder bore is very clean, no scratches or ridges.
I have cut all the excess from the back cover.
Starting to draw up plans for biplane that will be just a little bigger than my Kadet Senior. 80 inch top wing 70 inch bottom 13 inch chord, for 1950 square inches. I am will be using boost tabs http://www.rcuniverse.com/forum/tm.asp?m=375915 to cut weight i.e. normal servos (48 ounce inch) and 1000 ma battery. That will cut a about pound versus using 1/5 scale size.
My question is does anyone have a drawing of a mount plate they could share. I have some quarter inch aluminum plate I will cut mine from. My plan is to use aluminum stand offs drilled and tapped for quarter twenty bolts to mount to the firewall with.
On the XYZignition. Mine failed this weekend causing a very frustating weekend. if you do go with the xyz or any electronic ignition for that matter I would keep all your stock parts and keep them with you as aback upjust in case your electronic decides to poop out at a flying event. I wish i had mine with me i would have taken all the sensor parts off left the battery and ignition box in and wired the plug lead out of the way, installed stock ignition and kept on a flying. Honestly you really dont need the electronic and there really isnt much advantage to it. I dont think im gona bother replacing mine.
Oh yea i think mine failed cause it got gas soaked from a fuel leak in the fuel line.
I will start cutting my plate tomorrow.
On the plastic back cover 3 holes for the cover screwa are raised and 1 is flush on my motor. Would trueing the cover in a lathe be a good ideal. I have a 7 10 lathe.
I really dont know which one is better. What i can tell you the reason i purchased mine was to see if there was some power to be gained by not having the rotational wieght of the flywheel and if the stock magneto magnetic drag had any affect on power. I found that there was absolutly no gain to be had as far as power out put. a stock mag would produce just as much as the electronic. the only advantage i found is it had a better idle quality and was much easier to start. other than that i think it overcomplicates things with another battery, sensor and a ignition that has to be timmed and on and on. I am not going to use this and will stick with the stock ignition as it produces just as much power and in my opinion and this is just my opinion is far more reliable than the electronic ignition as there is just far less to go wrong. the weight savings just isnt enough to be a concern. granted you are losing the flywheel and coil but you must add back in the box and all the works ie sensor, and a fairly large battery. so the weight savings really isnt much
I had my XYZ ignition screwed down to a plywood plate and the bottome cover broke off from the vibration.
Buying from southeastrcengines.com gives you a warranty in the US. I prefer the easier starting on my Ryobi.
Jim
I use a single cell 1800 mah LiPoly battery to power my CHXL (essentially an RCEXL) ignition. It weighs a fraction of the weight of a NIXX battery and it runs fine at the lower voltage. Check out the CH ignition web site for tests that Bill has done on ignition function vs. supply battery voltage.
Except in rare occasions you can't hand start an engine with stock ignition.
Also my carb was so worn out from all the testing that i decided to go ahead and and install one of the wt577s i got on ebay. while convering itI noticed this carb actually has an acellerator pump that is run off of the throttle shaft. this carb lends itself well to conversion and runs great
[quote]ORIGINAL: diceco
I use a single cell 1800 mah LiPoly battery to power my CHXL (essentially an RCEXL) ignition. It weighs a fraction of the weight of a NIXX battery and it runs fine at the lower voltage. Check out the CH ignition web site for tests that Bill has done on ignition function vs. supply battery voltage.
Except in rare occasions you can't hand start an engine with stock ignition.
[/quote ]Where do you buy the 1800 mah battery & what brand are they? Thanks Capt,n
I will ask him next time i talk to him.
Bill
I also posted this just hoping that maybe somebody would chime in and revive this thread. I have read it almost two times and have learned so much from it. There was some childish posts made but they are easy enough to ignore. Anyway, thanks for the vast majority of the posts from the majority of the posters for a gold mine of information.
Bill
I have tried opening the pictures that you have uploaded but can't seem to get them to open. Whats the trick?
Thanks,
Larry
[email protected]
CraigjP in DFW ,Texas
Its a great engine foe the right plane. They run good, but the downfall is there weight. I have a Ryobi 31 in a big Rascal 110 and that plane handles the extra weight great. However the rule of thumb is to use them in a Plane with at least 1000 sq in of wing area and the Plane should probably weigh in 12lbs or under with engine installed to have good performance. For scale flight you can get by with a little heavier plane. Big Cub like planes and other scale machines are suited best to this engine. Mine runs flawless and I also have another one waitng to go into another project. There are some websites out there like Jag engines and some others that detail the process of converting.
CraigP
Something like a big Hobby Lobby Telemaster, Sig Rascal 110, perhaps a large stick plane like the Great Planes Giant Stick ARF, any 1/4 scale cub should handle the weight or perhaps something like a Four Star 120. There are plenty of options. However a little surgery may be required to the firewall of any of these planes to avoid adding a bunch of tail weight. Nothing to difficult.
Well off to work to pay for this !
CraigP