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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 3/30/2006 12:04 AM   
flyjoe540



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personally I'm going with that yak 54 (arf )by ak-models (actually,china models, ak is an importer I believe) for this engine I also have a great planes taylorcraft I got in a raffle I won , but 31cc might be too big for that i may have to get a 25cc for that one
if the yak works out I may get a extra 260-300 or a cap 232 for the other ryobi I have. but I got to get on that trainer and finish it .

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 3/30/2006 6:29 AM   
SaCCaL72



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quote:

I plan on building the Tiger Moth that being sold by Nitroplanes. Take a look at this. It is an arf and does cost a little more, but this is a great looking plane and Av8tor is building one right now with a Ryobi 31cc gas/glow engine.

http://www.nitroplanes.com/timo12076arf.html

I actually was looking at that Tiger Moth but when I asked the seller on RCU if a 31cc Ryobi would be adequate for the plane he said, "I don't think so because this is a size 120 plane" so I didn't look any further with it. Are you saying it would fit because I like the plane. I did read on the forums though that the instructions for this plane are very poor. It looks like a great plane though.
As for the 4 Star 120, I guess I would consider it, the only thing is I already have a 4 Star 40 and would like something different. I do like the aerobatic abilities of the 4 Star though.

flyjoe540,
Is this the plane you are talking about? http://www.ak-models.com/cmp_yak54_140.htm It is a nice plane also. Not a bad price. Do you have this plane yet? How is the quality?


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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 3/30/2006 12:10 PM   
aero nut


 

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Status: offline 		SacCaL the 31CC will work great on the 120 tiger moth I would gofor it if you like it

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 3/30/2006 1:39 PM   
flyjoe540



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yes you have the right one. and yes I have it in the box .the quality , it is a very nice looking model glass
fuse is beautiful wings and tail flawless as far as I can see,the instructions are a little light .it will take
some time to build. lots of hardware im satisfied with everything exsept the instructions . also look at the
giles 202 on that same site or katana , the giles is hard to beat price wise and its an arf . the draw back
is the instructions with all of these planes are sparse. if you like the moth buy it it should work fiine. probably
wont do 3d ,but then its not that kind of plane anyway

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 3/30/2006 4:35 PM   
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The Ryobi 31cc is a great engine for what it is, a long narrow design that produces a lot of thrust but little power. This Engine is best suited for a fun sport type plane and not anything designed for power stunts or 3d. I have this very engine in a nice Balsa USA Stingray 120 and she flys great. This plane is a fun sport design plane that weighs 14lbs and flys just like a big ole trainer. Very much like a 4 Star. The design of Ryobi best fits planes with a long narrow fuselage and the Tiger Moth is a perfect design for this engine. With the wing area of the Tiger Moth and the thrust the Ryobi will produce this plane will fly very nicely and have enough power to do the stunts the plane was designed for. I will be building this plane later this summer and installing a Ryobi 31cc that has been converted to gas/glow power. This is just my thought on this.


Thanks

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 3/30/2006 4:38 PM   
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Go back and take a look and post#3 and you'll see the Balsa USA 120 with the Ryobi 31cc engine installed in it.

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 3/30/2006 6:06 PM   
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Status: online 		If you like the way a 4 star 40 flies...you will like the 1.20 size with a gasser. Then too, if you build it yourself, you can modify it easy to fit your needs. Just my 2 cents. Capt,n

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/2/2006 10:16 PM   
flyjoe540



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did you get a chance to try your new carb yet? the anticipation is killing me I just orderd mine by mail yesterday
let me know how it works out as I have two 13.5mm comming from brillelli




sorry ,this happens to me occasionaly I'm working to correct this problem your patience is appreciated

< Message edited by flyjoe540 -- 4/2/2006 10:25 PM >

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/2/2006 10:18 PM   
flyjoe540



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did you get a chance to try your new carb yet? the anticipation is killing me I just orderd mine by mail yesterday
let me know how it works out as I have two 13.5mm comming from brillelli
did you pick an airframe yet?

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/2/2006 11:27 PM   
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Status: offline 		I need your input on this. I found two weedeater blowers 1500i 25cc. At Northern. Since they are blowers the carbs are mounted on the side not rear. I own a Great Planes Giant stix 80" Do you guys think this engine will be a good match for this plane?
The weedeater blowers are $55 each. I will get the conversion kit from Wackerengines for this motor.

Thanks
John

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 1:40 AM   
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I received my carb on Saturday but had to go away for the weekend to visit my parents. I did bring it all with me as I figured I would paint it this weekend before I put it all back together. Below are some pix of the paint job while it was still apart and drying.

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 1:46 AM   
SaCCaL72



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Also here are the pix of my old and new carb. What do you think? Which carb did you purchase from Brillelli. He sold me a Zama. My old one is on the right and the new is on the left. See how much bigger the venturi is on the new Zama compared to the old and the new has H&L needle adjustments. This carb requires tapping into the back plate for a pressure line. Here are the pix along with the back plate (not tapped yet) and the engine mount (wackerengines) that I painted also.

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 3:46 AM   
flyjoe540



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paint looks good! I think I ordered the same carb as yours 13.5mm, remote presure tap I sent the
check out fri or sat so it'll be awile before it shows up here but cant beat the price! still waiting on
my performance enhancing instruction book too. frustrating. still working on the trainer about
half done and I still have to tune my 45cc homie ,man I'm way behind schedule, that pesky job
I have keeps using up all my time,oh well, keep me informed on how the carb works out .
avoiding the airframe question ?type at ya later!

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 4:00 AM   
flyjoe540



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sorry I'm not familiar with the weedeater conversions ,is it a weedeater brand name? if so do a
search on this forum and read everything first then you can make an informed decision. a25cc
should fly it but it depends on how much power the make of engine you are looking at can
produce that will tell you how well it will fly it. its a good price and hopefully it will perform
adequately but without more info its hard to say .need brand name and model then maybee
one of these good fellers can give you a proper review.good luck!

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 4:45 AM   
SaCCaL72



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Thanks for your compliment. It isn't the greatest paint job but it will work. It is Black and Ford Red. But the red came out a little brighter than I wanted. The cap on the paint was a darker red. Oh well, it will have to do I guess... As for a plane, maybe I did avoid it, he he he, just kidding... I haven't decided yet. There are too many options, I am going to have to weigh out the + & -:

GP Giant Big Stik
Balsa USA Stingray
Dynaflite Super Decathalon
Sig Four Star 120
Tiger Moth 120

Hmmmmm, they are all great planes, I have to think about it yet. Keep me posted on your progress also.

-One question to anyone, does it matter which way the carb in mounted? Lets use the throttle as a reference. Can it be screwed to the back plate facing up or facing down? Do you know what I mean? Will it effect the performance?

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 5:26 AM   
flyjoe540



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I believe that it does not matter as far as the carb working goes because we will be using a
remote pulse line the only thing other than that would be
1) needle valve location and
2)carb linkage ,throttle cable access.
another question is how have you addressed the choke .the old one is too small and restrictive
have you given any thought to a new choke system?
as far as a plane goes pick a good arf. its almost flying season now, dont build all season ,do that
in the winter. an arf will save you time and the price is almost the same as building a kit (heck I
cant scratch build much cheaper than most arf's cost)the 4 star is one of my favorite's but it takes
time to build and cover ,an arf is almost done when you get it. o.k. thats just my 2cents
type at you later

< Message edited by flyjoe540 -- 4/3/2006 5:37 AM >

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 5:58 AM   
SaCCaL72



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Yeah, I noticed with this new carb, the throttle linkage is going to be more tricky than the old carb. Do we have to plug up the original hole in the back plate that supplied the original carb with it's pulse? I hear you on the building thing, that is why I keep going back to the ugly stik. I am not really in the mood to build as of now espesially since flying season is coming up. I have a GP 300S in the attic still waiting for me to build. Don't have to room to do it. So I guess it looks like that leaves me with the GP Giant Big Stik or the Tiger Moth. I don't think it matters because I have now been bitten by the conversion bug so I am sure I will be doing many more converts in the near future. It was kinda fun. Now that I have one almost done, they should get easier as time goes. I have to let the paint cure for about 1 week so I think by the weekend I will try to run this thing again, hopefully it will all work with the new carb. I will let you know. What are you putting yours in?

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 6:41 AM   
flyjoe540



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this one is going in a yak 54 china model the other one either the giles202 or the katana
same company just cant beat those deals
no you dont have to plug the old pulse hole ,the carb will do it when you bolt it on.
yeah I know scott warned me about it(the throttle linkage) when I spoke to him the other day
,its a minor thing we'll figure it out when the time comes I'm sure,he said its not that hard.
I know what you mean about this conversion bug I just happen to have an extra 25cc homelite
string trimmer and someone gave me a 25cc blower(it doesnt run yet but its just a dirty carb)
also a homelite. the trimmer runs fine I just tuned the carb on sat and wouldnt you know it
the u-joint in the head is going bad(straight face) not a big deal because I have a ryobi for the
lawn (its got decompresion slots in the cylinder)but I would really like either one of scotts 25gt's
or black baron's 50cc homelite conversions or just the stock engines to convert myself its quite
a lot of fun ya know!

one other tip for you on your muffler,to keep the pipes from vibrating out coat the threads with
jb-weld then screw them in tight let sit 24 hours ,done. to remove heat with propane torch to melt
jb-weld works great thanks to pete .

< Message edited by flyjoe540 -- 4/3/2006 6:53 AM >

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 7:06 PM   
SaCCaL72



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quote:

personally I'm going with that yak 54 (arf )by ak-models (actually,china models, ak is an importer I believe) for this engine


flyjoe540,
Is the Ryobi 31cc enough to fly the Yak 54 140? I thought the 31cc is good for about a 120 size plane. Do they go by the 2c or the 4c recommended engine size on a plane? What is the equivalent 2c or 4c for a 31cc engine?

Thanks for the tip on the exhaust stacks, I was wondering about that. When I ran it before, they kept coming loose and falling out. I was thinking of putting some teflon tape on there but wasn't sure if it could withstand that temp. I will have to pick some JB Weld up today, cool. I was able to drill and tap the back plate today, looks good. I will take a pic when I get home from work. Can't wait to get it back together again. I am trying to figure out the best way to mount the engine mount on the back of the engine to get access to the carb. I guess it would be easier if I had a plane before doing that. I haven't thought much about the choke solution yet. I guess something is going to have to be rigged up for it. hmmmmmmmm...

SaCCaL72

< Message edited by SaCCaL72 -- 4/3/2006 7:29 PM >

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 8:26 PM   
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The CMP Yak-54 140 is a beautiful airplane, but is on the heavy side and has a small wing area. The wing loading would be very high and the power would only be enough to fly around. You'll need to find a plane that well be around 14lbs or less when built and has at least a wing area over 1000sq. The Ryobi is a great fun sport engine, but does not produce the power that is need for a plane like the Yak-54.

Good luck in you serach for a good plane for your Ryobi 31cc.



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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 11:03 PM   
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I remember you telling me about that in the earlier posts, that is why I kinda questioned about the Yak as I saw the wing area at 806sq.in I thought it was kinda low and also it being a bigger aerobatic type plane you usually want to overpower them some to really fly them to thier potential. It is a great looking plane though. I hope it works out for flyboy540. As flyboy540 suggested, I think I will go with an ARF for now, I am sure I will be coverting many engines in the near future and can build something nice for them then but for now, I just want to get this thing in the air and learn about gassers and how they fly. I am excited to see her all done and in a plane. I know it sounds like I am beating a dead horse with the contiplation of which plane I want to get, but I guess I can be anal about things sometimes and I just wanted to pick the right one. I'll get over it and pick something soon, well see when the income tax check arrives what I can afford... he he he...

So does anyone know the approximate equivelent of gassers verses glow 2c and 4c engines?

A 31cc would be @equal to a what in a 2c and 4c? Thanks...

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/3/2006 11:40 PM   
flyjoe540



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I appreciate the concern but dont forget I went with electronic ignition that took off over 1 lb.
I'm not a three d guy but we'll see what happens.its not much heavyer than my magnum 180
glow engine.im going to weigh everything and add it up I lost the paper I had the figures on.
a little heavy I dont mind I got a few tricks left yet
what do you guys consider to high a wing load?right now im at around 34oz per ft?

< Message edited by flyjoe540 -- 4/4/2006 12:19 AM >

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/4/2006 1:23 AM   
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Status: offline 		With the Ryobi I would try and keep the wing loading down as low as I could get. I fly a Balsa USA StingRay 120 that has 1276sq in wing area and she weighs 14lbs with my Ryobi 31cc. Mine still has the magneto on it so with a gas/glow conversion she would be well under 13lbs. The wing loading comes in at just over 25 oz per sq in. She fly's like a big ole low wing trainer. If I could lose that extra lb it would make a big difference for doing stunts.

Thanks

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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/4/2006 2:15 AM   
box car



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Ken


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RE: McCulloch 31cc w/ Rear Exaust and Carb, is it better? - 4/4/2006 3:55 AM   
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naw,it dont look good I have too many irons in too many fires right now I'm a little bummed
about it ,but I'll get over it. I havent missed toledo in years ,but if I go this year I'll never get
caught up.

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